Browsing by Author "Shahinuzzaman, M."

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Removal of Copper from spiked Aqueous Solution Using Activated Carbon of Rice Husk
(Daffodil International University, 2022-09-29) Azad, Md Shahin; Hassan, Mohd Sukri; Shahinuzzaman, M.; Azhari, Syaza
Reprocessing materials as an adsorbent derived from agricultural waste like rice husk has been broadly applied to eliminate hazardous substances from the environment. The main objective of this research was to produce activated carbon from the agricultural waste of rice husk using activating agents like zinc chloride (ZnCl2) (1:2 ratio) and to evaluate the efficiency of copper removal with lower dosage from spiked aqueous solution. The batch adsorption process showed that the adsorption process was dependent on dose, pH, concentration and contact time. Within 10 min for the initial concentration of (1-5mg/L), the copper was removed absolutely (~100%) and the adsorption quantity was good (~20.45mg/g) using 0.25g/L of activated carbon for 100 mL aqueous solution at pH 6. But at the equilibrium state, the copper removal percentage was slightly decreased and obtained (97-100 %). Adsorption isotherm was well fitted with Langmuir (R2= 0.9946) and Freundlich isotherm (R2= 0.9979). Moreover, the kinetic isotherm was closely fitted by the pseudo second-order model with the regression coefficient (R2~ 1). So, the activated carbon of rice husk can be used as an adsorbent to effectively reduce copper ion from wastewater.
Roles of Inorganic Oxide Based HTMs Towards Highly Efficient and Long-Term Stable PSC—A Review
(Daffodil International University, 22-08-30) Shahinuzzaman, M.; Afroz, Sanjida; Mohafez, Hamidreza; Jamal, M. S.; Khandaker, Mayeen Uddin; Sulieman, Abdelmoneim; Tamam, Nissren; Islam, Mohammad Aminul
In just a few years, the efficiency of perovskite-based solar cells (PSCs) has risen to 25.8%, making them competitive with current commercial technology. Due to the inherent advantage of perovskite thin films that can be fabricated using simple solution techniques at low temperatures, PSCs are regarded as one of the most important low-cost and mass-production prospects. The lack of stability, on the other hand, is one of the major barriers to PSC commercialization. The goal of this review is to highlight the most important aspects of recent improvements in PSCs, such as structural modification and fabrication procedures, which have resulted in increased device stability. The role of different types of hole transport layers (HTL) and the evolution of inorganic HTL including their fabrication techniques have been reviewed in detail in this review. We eloquently emphasized the variables that are critical for the successful commercialization of perovskite devices in the final section. To enhance perovskite solar cell commercialization, we also aimed to obtain insight into the operational stability of PSCs, as well as practical information on how to increase their stability through rational materials and device fabrication.
Stability of Perovskite Solar Cells: Issues and Prospects
(The Royal Society of Chemistry, 2023-01-09) Chowdhury, Tanzi Ahmed; Zafar, Md. Arafat Bin; Islam, Md. Sajjad-Ul; Shahinuzzaman, M.; Islam, Mohammad Aminul; Khandaker, Mayeen Uddin
Even though power conversion efficiency has already reached 25.8%, poor stability is one of the major challenges hindering the commercialization of perovskite solar cells (PSCs). Several initiatives, such as structural modification and fabrication techniques by numerous ways, have been employed by researchers around the world to achieve the desired level of stability. The goal of this review is to address the recent improvements in PSCs in terms of structural modification and fabrication procedures. Perovskite films are used to provide a broad range of stability and to lose up to 20% of their initial performance. A thorough comprehension of the effect of the fabrication process on the device's stability is considered to be crucial in order to provide the foundation for future attempts. We summarize several commonly used fabrication techniques – spin coating, doctor blade, sequential deposition, hybrid chemical vapor, and alternating layer-by-layer. The evolution of device structure from regular to inverted, HTL free, and ETL including the changes in material utilization from organic to inorganic, as well as the perovskite material are presented in a systematic manner. We also aimed to gain insight into the functioning stability of PSCs, as well as practical information on how to increase their operational longevity through sensible device fabrication and materials processing, to promote PSC commercialization at the end.