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RISS 인기검색어
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- 저자 : Rashmi Walvekar (검색결과 4 건)
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Effect of electron beam irradiation on durian-peel-based activated carbon for phenol removal
Igbmno Major Jane,Khalid Mohammad,Raju Gunasunderi,Mubarak Nabisab Mujawar,Walvekar Rashmi,Ratnam Chantara Thevy,Chaudhary Vishal,Rani Gokana Mohana 한국탄소학회 2023 Carbon Letters Vol.33 No.4
This study investigated durian (Durio zibethinus) peels to produce powdered activated carbon (DPAC). The influence of process variables such as carbonization temperature, activation time, contact time, CO2 flow rate, and adsorption dosage was optimized using response surface methodology (RSM). A six-factor and two levels Box–Behnken design (BBD) was used to optimize the parameters. The independent variables were activation temperature (°C), duration (min), CO2 flow rate during the activation process (L/min), irradiation of adsorbent (kGy), irradiation duration (min), and adsorbent dosage (g) while phenol removal (mg/L) was the dependent variable (response). Following the observed correlation coefficient values, the design was fitted to a quadratic model (R2 = 0.9896). The optimal removal efficiency (97.25%) was observed at an activation temperature of 900 °C, activation time of 30 min, CO2 flow rate of 0.05 L/min, irradiation dose of 100 kGy, contact time of 35 min and adsorption dosage of 0.75 g. The optimal DPAC showed a BET surface of 281.33 m2/g. The removal efficiency was later compared with a commercially available activated carbon which shows a 98.56% phenol removal. The results show that the durian peel could be an effective precursor for making activated carbon for phenol removal, and irradiation can significantly enhance surface activation.
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Xin Xiong Chang,Nabisab Mujawar Mubarak,Shaukat Ali Mazari,Abdul Sattar Jatoi,Awais Ahmad,Mohammad Khalid,Rashmi Walvekar,E.C. Abdullah,Rama Rao Karri,M.T.H Siddiqui,Sabzoi Nizamuddin 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
The concept of green chemistry has attracted attention due to the green synthesis and ecofriendly natureof the compounds leading to the green and sustainable chemical industries and processes. Chitosan is anecofriendly material, which is biodegradable, non-toxic, and biocompatible. It has the potential to bemodified into biofilms for various applications such as biomedical, packaging, and pharmaceutical fields. Nevertheless, some poor properties of chitosan restrict its wide applications. The incorporation ofnanocellulose fillers into chitosan matrix can enhance the mechanical and thermal properties of chitosan. Cellulose nanomaterials can be achieved through chemical and mechanical modifications. The commontype of nanocellulose are cellulose nanofibers (CNFs), cellulose nano-whiskers (CNWs), tunicate CNCs (t-CNCs), algae cellulose particles (AC) and bacterial cellulose particles (BC). Nanocellulose are applied asthe reinforcement fillers in various polymer matrices such as polysaccharides, proteins, lipids, polylacticacid etc. Deep eutectic solvents (DES) are relatively novel green solvents, which can be applied in variousfields. DES are widely applied in metal processing, polymer processing and synthesis. Even though thereare not much studies available on DES for synthesis of nanocomposite films; however they are used aseco-friendly solvents in manufacturing processes. This study reviews the discovery, structure, propertiesof chitosan and cellulose, their derivatives and applications. In addition, the paper also discusses theproperties of DES and their applications.
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Wulandhari Sudarsono,Sue Ying Tan,Wai Yin Wong,Fatin Saiha Omar,K. Ramya,Shahid Mehmood,Arshid Numan,Rashmi Walvekar,Mohammad Khalid 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
The development of low-cost fuel cell technology has involved substantial research on platinum-free ornon-platinum group metal (non-PGM) catalysts for oxygen reduction reactions (ORR) in proton exchangemembrane fuel cells. However, due to macroscale degradation and flooding issues in fuel cell systems,catalyst development has faced significant challenges in rapid active site degradation over a short time. This review presents the impacts of the non-PGM catalyst structure on the ORR activity and single-cellperformance. A balance in the micropores, mesopores and macropores is sought to ensure high accessibilityto the active sites, a high active site density, and good water management at the electrode layer toprevent active site blockage. The unsatisfactory single-cell performance of non-PGM electrodes alsopotentially arises from the conventional catalyst ink-casting technique. This review also provides insightinto the necessary strategies for producing non-PGM MEAs via proper porous architecture and innovativecatalyst casting techniques to develop promising low-cost PEMFC technology.
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Biodiesel synthesis using natural solid catalyst derived from biomass waste — A review
Song Yuan Chua,Loshinie A/P Periasamy,Celine Ming Hui Goh,Yie Hua Tan,Nabisab Mujawar Mubarak,Jibrail Kansedo,Mohammad Khalid,Rashmi Walvekar,E.C. Abdullah 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Biodiesel serves as an ideal candidate for alternative fuel as it is made from renewable source with lowerpollutant emission. However, current biodiesel production has several issues such as unrecoverablecatalyst, expensive separation stage and high wastewater generation due to the use of homogeneouscatalyst. Currently, there are several pathways to produce biodiesel without the problems stated abovesuch as supercritical condition transesterification and enzymatic catalyst. However, the economicfeasibility for both methods serve as a major hindrance due to extremely high pressure and pressure,expensive synthetic cost of enzyme, which lead to higher operation cost. At the present, heterogeneouscatalyst is the alternative, especially heterogeneous catalyst derived from natural resources such as wastebiomass are currently being extensively researched with promising results. Thus, this paper illustratesthe comprehensive research of biodiesel synthesis and assesses the latest breakthroughs involved in theuse of catalysts derived from waste biomass. Furthermore, an amalgam of experimental data obtainedfrom similar literature has been thoroughly reviewed to provide a better framework to produce biodiesel. Apart from that, this study aims to alleviate problems associated with heterogeneous catalyst separationand enhance the economic viability of the industry, thus, sustaining the environment while meetingenergy demands.
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