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Preparation of microporous activated carbon and its modification for arsenic removal from water
Mohammad Asadullah,Israt Jahan,Mohammad Boshir Ahmed,Pasilatun Adawiyah,Nur Hanina Malek,Mohammad Sahedur Rahman 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Arsenic removal from water was investigated using activated carbon. The chemical activated carbon(CAC) prepared using H3PO4 from jute stick largely featured micropore structure with surface functionalgroups, while meso- and macropore structures were mainly developed in physical activated carbon(PAC). The CAC and PAC reduced arsenic concentration to 45 and 55 mg L-1, respectively, from100 mg L-1 while iron-loaded CAC reduced to 3 mg L-1, which is lower than the upper permissible limit(10 mg L-1). The micropore structure of CAC along with complexation affinity of iron species towardsarsenic species attributed to enhanced separation of arsenic.
Mohammad Asadullah,Mohammad Shajahan Kabir,Mohammad Boshir Ahmed,Nadiah Abdul Razak,Nurul Suhada Abdur Rasid,Airin Aezzira 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.12
Activated carbons have been prepared from jute stick by both chemical and physical activation methods using zinc chloride and steam, respectively. They were characterized by evaluating surface area, iodine number, pore size distribution, and concentration of surface functional groups. The chemically activated carbon largely featured micropore structure,while the physically activated carbon mainly featured macropore structure. The specific surface area of chemically and physically activated carbons was 2,325 and 723 m2/g, while the iodine number was 2,105 and 815mg/g, respectively. The concentration of surface functional groups was determined by Boehm titration method, which suggested that different types of surface functional groups are randomly distributed on chemical activated carbons, while it is limited for physical activated carbon. The microporosity along with surface functional groups provided a unique property to chemically activated carbon to adsorb Methylene Blue dye to a large extent. The adsorption of dye was also affected by the adsorption parameters such as adsorption time, temperature and pH. Comparatively, higher temperature and pH significantly facilitated dye adsorption on chemically activated carbon.