Browsing by Author "Roy, Hridoy"

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A Comprehensive Review on the Sustainable Treatment of Textile Wastewater
(Scopus, 22-11-19) Jahan, Nusrat; Tahmid, Mohammed; Shoronika, Afrina Zaman; Fariha, Athkia; Roy, Hridoy; Pervez, Md. Nahid; Cai, Yingjie; Naddeo, Vincenzo; Islam, Md. Shahinoor
Clothing, one of the basic needs, demands the growth of textile industries worldwide, resulting in higher consumption and pollution of water. Consequently, it requires extensive treatment of textile effluent for environmental protection as well as reuse purposes. Primary treatment, secondary treatment, and tertiary treatment are the three major phases of textile wastewater treatment. Secondary treatment under aerobic and anaerobic circumstances is carried out to decrease BOD, COD, phenol, residual oil, and color, whereas primary treatment is utilized to remove suspended particles, oil, grease, and gritty materials. However, biological treatment is not fully capable of treating water according to discharge/reuse standards. Hence, tertiary treatment is used to remove final contaminants from the wastewater. Adsorption is regarded as one of the most feasible processes for dye and metal removal in consideration of cost and variation in the adsorbent. Though membrane filtration is an efficient process, the cost of operation limits its application. It’s unfortunate that there isn’t a universally applicable treatment solution for textile effluents. Therefore, the only flexible strategy is to combine several therapy modalities. Treatment of complicated, high-strength textile wastewater depending on pollutant load will be more successful if physical, chemical, and biological approaches are used in tandem. Enforcement of stringent environmental regulation policies, increasing costs and demand for freshwater, and the rising costs and difficulties associated with wastewater disposal are accelerating efforts toward achieving ZLD. Additionally, research into methods for extracting useful materials from wastewater has blossomed in recent years. As such, the purpose of this analysis is to give a holistic overview of textile wastewater treatment systems, with a focus on zero liquid discharge (ZLD) and efficient resource recovery, both of which may hasten the transition to more sustainable water management.
Advanced Applications of Carbonaceous Materials in Sustainable Water Treatment, Energy Storage, and CO2 Capture
(MDPI Publications, 2023-05-30) Reza, Md Sumon; Afroze, Shammya; Kuterbekov, Kairat; Kabyshev, Asset; Bekmyrza, Kenzhebatyr Zh.; Haque, Md Naimul; Islam, Shafi Noor; Hossain, Md Aslam; Hassan, Mahbub; Roy, Hridoy; Islam, Md Shahinoor; Pervez, Md Nahid; Azad, Abul Kalam
The demand for energy has increased tremendously around the whole world due to rapid urbanization and booming industrialization. Energy is the major key to achieving an improved social life, but energy production and utilization processes are the main contributors to environmental pollution and greenhouse gas emissions. Mitigation of the energy crisis and reduction in pollution (water and air) difficulties are the leading research topics nowadays. Carbonaceous materials offer some of the best solutions to minimize these problems in an easy and effective way. It is also advantageous that the sources of carbon-based materials are economical, the synthesis processes are comfortable, and the applications are environmentally friendly. Among carbonaceous materials, activated carbons, graphene, and carbon nanotubes have shown outstanding performance in mitigating the energy crisis and environmental pollution. These three carbonaceous materials exhibit unique adsorption properties for energy storage, water purification, and gas cleansing due to their outstanding electrical conductivity, large specific surface areas, and strong mechanical strength. This paper reviews the synthesis methods for activated carbons, carbon nanotubes, and graphene and their significant applications in energy storage, water treatment, and carbon dioxide gas capture to improve environmental sustainability.
Antibiotic-contaminated wastewater treatment and remediation by electrochemical advanced oxidation processes (EAOPs)
(Scopus, 2024-05-24) Mahmud, Foysal; Banhi, Tabassum Sunjida; Roy, Hridoy; Dihan, Musfekur Rahman; Islam, Md. Shahinoor; Cai, Yingjie; Asiri, Abdullah M.; Rahman, Mohammed M.; Hasan, Md. Munjur; Shenashen, M.A.; Islam, Aminul; Sheikh, Md. Chanmiya; Awu, Md. Rabiul
Antibiotics are extensively used in health sectors, animal husbandry, and agriculture, which raises serious concerns nowadays due to their presence in surface water, groundwater, soil, sediment, and plants. Antibiotics in water can cause the accumulation and spread of antibiotic-resistant genes that have a serious impact on the environment. Moreover, due to the refractory and persistent nature of antibiotics, conventional wastewater treatment technologies including physio-chemical and biological treatments are inefficient for antibiotic wastewater treatment. In recent times, Electrochemical Advanced Oxidation Processes (EAOPs) have been reported to be effective in the treatment of antibiotic-contaminated wastewater. These specialized techniques produce very reactive and oxidizing intermediate •OH radicals which readily degrade the antibiotics. In this article three most important EAOPs, Electro Oxidation (EO), Photo Electro Catalytic Oxidation (PEC), and Electro Fenton (EF) are reviewed along with their classification, performance in different antibiotics, influencing factors e.g., anode-cathode materials, pH, current density, initial concentration, temperature, and supporting electrolytes. These processes offer eco friendly, sustainable, cost-effective methods for treating antibiotics. Moreover, the feasibility of EAOPs in industrial wastewater treatment has not been properly established due to toxic intermediates, high cost, incapable to handle a large volume of wastewater, its performance only at ideal conditions, degrade only a few antibiotics, and mass transfer limitations. Consequently, combining membrane separation and conventional biological treatments as pre- or post-treatments of EAOPs can effectively address toxicity reduction and the handling of large volumes of wastewater. In addition, the energy consumption in a single EO process is higher than the combined processes. To constructively write this review, data have been collected from renowned publishers e.g., ScienceDirect, Springer, Willey, American Chemical Society Publications, etc. The possibilities, challenges, and future outlooks for the scale-up and commercialization of existing lab-based EAOPs have been discussed for the sustainable use of EAOPs in treating toxic and bio persistent antibiotic compounds from wastewater. Furthermore, the research gaps mentioned in this paper can encourage future researchers to utilize the merits of EAOPs and combined processes for achieving high degradation efficiency of antibiotics at low cost and establishing it commercially.
Aquatic Microplastic Pollution Control Strategies Sustainable Degradation Techniques, Resource Recovery, and Recommendations for Bangladesh
(Scopus, 22-12-06) Mahmud, Abir; Wasif, Mustafa Md; Roy, Hridoy; Mehnaz, Fareen; Ahmed, Tasnim; Pervez, Md. Nahid; Naddeo, Vincenzo; Islam, Md. Shahinoor
Microplastics’ dangers and the absence of effective regulation technologies have risen to prominence as a worldwide issue in recent years. South Asian countries, such as Bangladesh, are among the most threatened nations to face the drastic consequence of releasing microplastics into the aquatic environment. The research on managing and degrading microplastics is ongoing, however, sustainable techniques have not yet been found. To create a green and efficient microplastic management plan, we have compiled all the information on the existing removal and degradation techniques for microplastics and provided an overview of all the noteworthy methods that can be implemented in Bangladesh. In the portrayed biotic and abiotic techniques, coagulation and photo catalysis were found to be most efficient in removing microplastics (as high as 99%) in different studies. The concept of microplastic is new to the researchers of Bangladesh, therefore, the characteristics, occurrence, fate, and threats are briefly discussed in this paper. Sampling, extraction, and identification methods of microplastic in freshwater and sediment samples are also thoroughly specified. The sources of microplastic pollution in Bangladesh and possible strategies that can be implemented to minimize additional microplastic discharge into aquatic environments are discussed. Although Bangladesh was the very first country to ban polythene, the failure of the implementation of rules and regulations and a lack of management strategy made Bangladesh the 10th worst country in managing plastic waste. This work is a wake-up call for other researchers to conduct an in-depth investigation to improve microplastic degrading technologies and develop a sustainable strategy to end microplastic pollution in Bangladesh.
Electrocoagulation-based wastewater treatment process and significance of anode materials for the overall improvement of the process: A critical review
(Scopus, 2024) Sadaf, Shoumik; Roy, Hridoy; Fariha, Athkia; Rahman, Tanzim Ur; Tasnim, Nishat; Jahan, Nusrat; Sokan-Adeaga, Adewale Allen; Safwat, Safwat M.; Islam, Md Shahinoor
The electrocoagulation (EC) technique has been thoroughly investigated over the last decade in several reviews. The selection and modification of anode materials play a crucial role in enhancing the efficiency and effectiveness of the EC process. This paper sheds light on an overview of the EC process, its principle, mechanism, and applications in wastewater treatment, mainly based on different anode materials and their applicability in various industries. It then discusses the importance of anode material selection and modification, emphasizing surface modification techniques such as conducting polymer and nanopolymer composite coating. These techniques aim to improve the anode's electrochemical properties and performance in wastewater treatment. Furthermore, this review conducts a comprehensive cost analysis of the EC process, considering equipment, energy consumption, maintenance, and chemical requirements along with different electrode materials. Cost-effective strategies for implementing EC-based wastewater treatment systems are discussed, highlighting the importance of considering long-term operational costs and environmental impacts. The review also provides future perspective recommendations for advancing the field of EC-based wastewater treatment. It suggests areas for further research, such as developing novel anode materials, optimizing surface modification techniques, and integrating EC with other treatment processes, such as wireless EC and nano-filtration, for improved efficiency.
Electrocoagulation-based wastewater treatment process and significance of anode materials for the overall improvement of the process: A critical review
(2024) Sadaf, Shoumik; Roy, Hridoy; Fariha, Athkia; Rahman, Tanzim Ur; Tasnim, Nishat; Jahan, Nusrat; Adeaga, Adewale Allen Sokan-; Safwat, Safwat M.; Islam, Md Shahinoor
The electrocoagulation (EC) technique has been thoroughly investigated over the last decade in several reviews. The selection and modification of anode materials play a crucial role in enhancing the efficiency and effectiveness of the EC process. This paper sheds light on an overview of the EC process, its principle, mechanism, and applications in wastewater treatment, mainly based on different anode materials and their applicability in various industries. It then discusses the importance of anode material selection and modification, emphasizing surface modification techniques such as conducting polymer and nanopolymer composite coating. These techniques aim to improve the anode's electrochemical properties and performance in wastewater treatment. Furthermore, this review conducts a comprehensive cost analysis of the EC process, considering equipment, energy consumption, maintenance, and chemical requirements along with different electrode materials. Cost-effective strategies for implementing EC-based wastewater treatment systems are discussed, highlighting the importance of considering long-term operational costs and environmental impacts. The review also provides future perspective recommendations for advancing the field of EC-based wastewater treatment. It suggests areas for further research, such as developing novel anode materials, optimizing surface modification techniques, and integrating EC with other treatment processes, such as wireless EC and nano-filtration, for improved efficiency.
Ex Situ Catalytic Pyrolysis of Invasive Pennisetum purpureum Grass with Activated Carbon for Upgrading Bio-Oil
(MDPI Publications, 2023-05-06) Reza, Md Sumon; Afroze, Shammya; Kuterbekov, Kairat; Kabyshev, Asset; Bekmyrza, Kenzhebatyr Zh.; Taweekun, Juntakan; Ja’afar, Fairuzeta; Bakar, Muhammad Saifullah Abu; Azad, Abul K.; Roy, Hridoy; Islam, Md. Shahinoor
Energy demands keep increasing in this modern world as the world population increases, which leads to a reduction in fossil fuels. To resolve these challenges, Pennisetum purpureum, an invasive grass in Brunei Darussalam, was examined as the feedstock for renewable energy through a catalytic pyrolysis process. The activated carbon was applied as the catalyst for a simple and economical solution. The catalytic pyrolysis was executed at 500 °C (the temperature for the highest biofuel yield) for both reactors to produce the highest amount of upgraded biofuels. The biochar produced from the non-catalytic and catalytic pyrolysis processes showed a consistent yield due to stable operating conditions, from which the activated carbon was generated and used as the catalyst in this work. A significant amount of improvement was found in the production of biofuels, especially bio-oil. It was found that for catalysts, the number of phenolic, alcohol, furans, and ketones was increased by reducing the amount of acidic, aldehyde, miscellaneous oxygenated, and nitrogenous composites in bio-oils. The highest amount of phenolic compounds was produced due to a number of functional groups (-C=O and -OH) in activated carbon. The regenerated activated carbons also showed promising outcomes as catalysts for upgrading the bio-oils. The overall performance of synthesized and regenerated activated carbon as a catalyst in catalytic pyrolysis was highly promising for improving the quality and stability of bio-oil.
Global Advancements and Current Challenges of Electric Vehicle Batteries and Their Prospects A Comprehensive Review
(Scopus, 22-12-31) Roy, Hridoy; Roy, Bimol Nath; Hasanuzzaman, Md.; Islam, Md. Shahinoor; Abdel-Khalik, Ayman S.; Hamad, Mostaf S.; Ahmed, Shehab
Battery electric vehicles (BEVs) have started to play a significant role in the transport sector and automotive industries. The broader market penetration of BEVs has still not been achieved due to significant barriers associated with initial costs and short driving ranges. The purchase price and a limited driving range are barriers that are inevitably associated with battery technology. Therefore, the growing demand for BEVs has expedited new innovative approaches to improve battery capacity and performance and to reduce battery costs. Considerable advancements have been employed to meet the challenges. However, there are still many challenges to make BEVs affordable and convenient for users. In this review, the main aims are to identify and address challenges by considering the prospects of BEVs in the future market and to explore the technological and financial difficulties of low energy density of battery materials, fast charging rate, battery lifetime, and cost-effectiveness, associated with effectively implementing and adopting BEVs. Moreover, potential suggestions are proposed for researchers, manufacturers, users, and government policy planners. Finally, a concrete conclusion is drawn by disseminating a vision about the future adoption of BEVs. This review of technologies, challenges, prospects, and potential solutions associated with BEVs could provide a base for effective strategic policy and could help policymakers to frame strategies for adapting and achieving targets. This review could help to achieve sustainable BEV transport and to adopt next-generation green vehicles.
Healthcare Waste in Bangladesh: Current Status, the Impact of COVID-19 and Sustainable Management With Life Cycle and Circular Economy Framework
(Elsevier, 2023-02-09) Dihan, Musfekur Rahman; Nayeem, S.M. Abu; Roy, Hridoy; Islam, Md. Shahinoor; Islam, Aminul; Alsukaibi, Abdulmohsen K.D.; Awual, Md. Rabiul
COVID-19 has accelerated the generation of healthcare (medical) waste throughout the world. Developing countries are the most affected by this hazardous and toxic medical waste due to poor management systems. In recent years, Bangladesh has experienced increasing medical waste generation with estimated growth of 3 % per year. The existing healthcare waste management in Bangladesh is far behind the sustainable waste management concept. To achieve an effective waste management structure, Bangladesh has to implement life cycle assessment (LCA) and circular economy (CE) concepts in this area. However, inadequate data and insufficient research in this field are the primary barriers to the establishment of an efficient medical waste management systen in Bangladesh. This study is introduced as a guidebook containing a comprehensive overview of the medical waste generation scenario, management techniques, Covid-19 impact from treatment to testing and vaccination, and the circular economy concept for sustainable waste management in Bangladesh. The estimated generation of medical waste in Bangladesh without considering the surge due to Covid-19 and other unusual medical emergencies would be approximately 50,000 tons (1.25 kg/bed/day) in 2025, out of which 12,435 tons were predicted to be hazardous waste. However, our calculation estimated that a total of 82,553, 168.4, and 2300 tons of medical waste was generated only from handling of Covid patients, test kits, and vaccination from March 2021 to May 2022. Applicability of existing guidelines, and legislation to handle the current situation and feasibility of LCA on medical waste management system to minimize environmental impact were scrutinized. Incineration with energy recovery and microwave sterilization were found to be the best treatment techniques with minimal environmental impact. A circular economy model with the concept of waste minimizaton, and value recovery was proposed for sustainable medical waste management. This study suggests proper training on healthcare waste management, proposing strict regulations, structured research allocation, and implementation of public-private partnerships to reduce, and control medical waste generation for creating a sustainable medical waste management system in Bangladesh.
Microbial Fuel Cell Construction Features and Application for Sustainable Wastewater Treatment
(MDPI Publications, 2023-04-30) Roy, Hridoy; Rahman, Tanzim Ur; Tasnim, Nishat; Arju, Jannatul; Rafid, Md. Mustafa; Islam, Md. Reazul; Pervez, Md. Nahid; Cai, Yingjie; Naddeo, Vincenzo; Islam, Md. Shahinoor
A microbial fuel cell (MFC) is a system that can generate electricity by harnessing microorganisms’ metabolic activity. MFCs can be used in wastewater treatment plants since they can convert the organic matter in wastewater into electricity while also removing pollutants. The microorganisms in the anode electrode oxidize the organic matter, breaking down pollutants and generating electrons that flow through an electrical circuit to the cathode compartment. This process also generates clean water as a byproduct, which can be reused or released back into the environment. MFCs offer a more energy-efficient alternative to traditional wastewater treatment plants, as they can generate electricity from the organic matter in wastewater, offsetting the energy needs of the treatment plants. The energy requirements of conventional wastewater treatment plants can add to the overall cost of the treatment process and contribute to greenhouse gas emissions. MFCs in wastewater treatment plants can increase sustainability in wastewater treatment processes by increasing energy efficiency and reducing operational cost and greenhouse gas emissions. However, the build-up to the commercial-scale still needs a lot of study, as MFC research is still in its early stages. This study thoroughly describes the principles underlying MFCs, including their fundamental structure and types, construction materials and membrane, working mechanism, and significant process elements influencing their effectiveness in the workplace. The application of this technology in sustainable wastewater treatment, as well as the challenges involved in its widespread adoption, are discussed in this study.
Progress in Plasma Doping Semiconductor Photocatalysts for Efficient Pollutant Remediation and Hydrogen Generation
(Elsevier, 2023-09-01) Rahman, Tanzim Ur; Roy, Hridoy; Fariha, Athkia; Shoronika, Afrina Zaman; Al-Mamun, Md. Rashid; Islam, Syed Z.; Islam, Md. Shahinoor; Marwani, Hadi M.; Islam, Aminul; Alsukaibi, Abdulmohsen K.D.; Rahman, Mohammed M.; Awual, Md. Rabiul
In recent years, solar energy-driven photocatalysis materials have drawn significant attention to addressing the global energy and environmental crisis. However, many of the semiconductor photocatalysts are unable to absorb the visible light of the solar spectra due to their wide band gap. The incorporation of a foreign element such as a dopant in the lattice of these photocatalysts was shown to reduce their band gap and enhance visible light absorption. The doping of semiconductors can be performed using several techniques such as sol–gel, hydrothermal, solvothermal, and plasma-based doping. However, plasma-based doping has been considered a highly efficient approach due to the reduction of the band gap to a large extent, enhancement of visible light absorption, and remarkable photocatalytic activities under visible light illumination. The plasma-based doping approach offered many advantages such as high reactivity, process simplicity, scalability, energy efficiency, homogeneous doping, no chemical inventory, low pressure, and low-temperature operation, and flexibility of operation under gas and liquid phase media. Further advancement of plasma-based doping can be achieved through more theoretical studies allowing an in-depth understanding of the mechanisms and interactions of the species involved. This will facilitate the synthesis and application of doped photocatalysts in a cost-effective manner. This review surveyed recent advances in a wide range of semiconductor photocatalysts doped with various dopants using plasma treatment. Various plasma methods for doping semiconductor photocatalysts and their fundamental mechanisms were discussed. The performance characteristics of the plasma-doped photocatalysts were compared to other methods in terms of energy and environmental applications including degradation of environmental contaminants and solar fuel production such as hydrogen production from water splitting using visible light-driven solar energy. Finally, potential future research directions were recommended for the applications of the efficient photocatalysts developed by plasma treatment.
State-of-the-Art in Solar Water Heating (Swh) Systems for Sustainable Solar Energy Utilization: A Comprehensive Review
(Elsevier, 2023-09-30) Al-Mamun, Md. Rashid; Roy, Hridoy; Islam, Md. Shahinoor; Ali, Md. Romzan; Hossain, Md. Ikram; Aly, Mohamed Aly Saad; Khan, Md. Javed Hossain; Marwani, Hadi M; Islam, Aminul; Haque, Enamul; Rahman, Mohammed M; Awual, Md. Rabiul
The solar water-heating (SWH) system is one of the most convenient applications of solar energy, which is considered an available, economical, and environmentally friendly energy source to fulfill the energy demands of the world. In this review, existing SWH systems and design aspects of major components e.g., solar thermal collector, storage tank, heat exchanger, heat transferring fluid, absorber plate, etc. were extensively studied. Recent research to further improve SWH systems and potential practical applications are critically reviewed. Moreover, a relatively new concept in SWH systems, which is using nanofluids in solar collectors as heat transfer fluid has been studied in terms of design criteria for the development of SWH systems. Stationary flat plate collector (FPC) and single-axis tracking compound parabolic collector (CPC) exhibit thermal efficiencies of 45–60 % (operating range: 25–100 °C) and 30–50 % (operating range: 60–300 °C), respectively. The use of thermal stratification structures e.g., diffusers, baffles, membranes, fabrics, etc. is an effective tool to reduce heat losses from the storage tank as well as to harvest the highest energy from the solar collector. Coating of nanomaterials e.g., nickel, copper, etc. was found to reduce the backside heat loss in SWJ systems which eventually increases the thermal performance of the system. Nanofluids consisting of multiwall carbon nanotubes (MWCNTs) and Al2O3 increased the effectiveness of FPC by 28.3 and 35 %, respectively. Moreover, using CuO nanofluids, the collector efficiency of a typical evacuated tube collector (ETC) was increased by up to 12.4 %. Several potential future recommendations for improving the performance of the SWH system were stated.
The Advancement in Membrane Bioreactor (MBR) Technology toward Sustainable Industrial Wastewater Management
(MDPI Publications, 2023-02-02) Rahman, Tanzim Ur; Roy, Hridoy; Islam, Md. Reazul; Tahmid, Mohammed; Fariha, Athkia; Mazumder, Antara; Tasnim, Nishat; Pervez, Md. Nahid; Cai, Yingjie; Naddeo, Vincenzo; Islam, Md. Shahinoor
The advancement in water treatment technology has revolutionized the progress of membrane bioreactor (MBR) technology in the modern era. The large space requirement, low efficiency, and high cost of the traditional activated sludge process have given the necessary space for the MBR system to come into action. The conventional activated sludge (CAS) process and tertiary filtration can be replaced by immersed and side-stream MBR. This article outlines the historical advancement of the MBR process in the treatment of industrial and municipal wastewaters. The structural features and design parameters of MBR, e.g., membrane surface properties, permeate flux, retention time, pH, alkalinity, temperature, cleaning frequency, etc., highly influence the efficiency of the MBR process. The submerged MBR can handle lower permeate flux (requires less power), whereas the side-stream MBR can handle higher permeate flux (requires more power). However, MBR has some operational issues with conventional water treatment technologies. The quality of sludge, equipment requirements, and fouling are major drawbacks of the MBR process. This review paper also deals with the approach to address these constraints. However, given the energy limitations, climatic changes, and resource depletion, conventional wastewater treatment systems face significant obstacles. When compared with CAS, MBR has better permeate quality, simpler operational management, and a reduced footprint requirement. Thus, for sustainable water treatment, MBR can be an efficient tool.
Toxic dye removal, remediation, and mechanism with doped SnO2-based nanocomposite photocatalysts: A critical review
(Daffodil International University, 2023-08) Roy, Hridoy; Rahman, Tanzim Ur; Khan, Md. Atquj Jaman Riad; Mamun, Md. Rashid Al-; Islam, Syed Z.; Khaleque, Md. Abdul; Hossain, Md. Ikram; Khan, Md. Zaved Hossain; Islam, Md. Shahinoor; Marwani, Hadi M.; Islam, Aminul; Hasan, Md. Munjur; Awual, Md. Rabiul
Heterogeneous photo catalysis is considered to be a sustainable solution for treating organic pollutants in wastewater. Tin oxide (SnO2) has received immense attention from researchers due to its excellent photocatalytic activity, low cost, thermal stability, and resistance to photo erosion. The structural properties of SnO2, different strategies for doping of SnO2, organic degradation mechanisms, and optimization of operational parameters for enhanced photocatalysis were critically analyzed. Photocatalytic activity of pristine SnO2 was enhanced by doping with metal oxide-based semiconductor materials, metals (transitional and earth), and non-metals. Doped SnO2 exhibits higher photocatalytic efficiency than pristine SnO2 due to the enhanced charge carrier separation, reduced electron-hole pair recombination, higher surface area, and lower band-gap energy. Green synthesized TiO2 doped SnO2 exhibited reduced band gap energy of 2.8 eV, and degraded 96 % MB within 75 min under visible light irradiation. The lowest bandgap energy for transitional metal-doped SnO2 was achieved by Mn-doping on SnO2 with a bandgap of ∼2.48 eV, whereas Cu-SnO2 and pure SnO2 have bandgap energies of 3.67 eV and ∼3.75 eV, respectively. Copper chromite spinel nanoparticles (CuCr2O4) doped SnO2 with a band gap energy of 1.39 eV degraded crystal violet (CV) dye completely at neutral pH. Gadolinium (Gd) doped SnO2 particles showed the highest surface area (58 m2/g) which was almost double the pristine SnO2 particles. The degradation of organic dyes by doped-SnO2 depended on initial pH, catalyst dosage, pollutants concentration, dose, light intensity, etc. For the degradation of cationic dye (MB), approximately 50 % more degradation was found at basic pH than at acidic pH utilizing pristine SnO2 nanoparticles. On the contrary, about 20 % more degradation was found for anionic dye (Congo Red) degradation at acidic pH compared to basic pH. Moreover, optimization of catalyst dosage can result in about 50 % more degradation of pollutants. The ZnS-doped SnO2 photocatalysts have shown an increased rate constant of photocatalytic reaction by 24.5 times when the concentration was reduced from 30 mg/L to 5 mg/L. This review also assessed the future research directions to develop sustainable organic pollutants-based wastewater using SnO2.