title: Efficient removal of arsenic from water using a granular adsorbent: Fe-Mn binary oxide impregnated chitosan bead.
abstract: A novel sorbent of Fe-Mn binary oxide impregnated chitosan bead (FMCB) was fabricated through impregnating Fe-Mn binary oxide into chitosan matrix. The FMCB is sphere-like with a diameter of 1.6-1.8 mm, which is effective for both As(V) and As(III) sorption. The maximal sorption capacities are 39.1 and 54.2 mg/g, respectively, outperforming most of reported granular sorbents. The arsenic was mainly removed by adsorbing onto the Fe-Mn oxide component. The coexisting SO4(2-), HCO3(-) and SiO3(2-) have no great influence on arsenic sorption, whereas, the HPO4(2-) shows negative effects. The arsenic-loaded FMCB could be effectively regenerated using NaOH solution and repeatedly used. In column tests, about 1500 and 3200 bed volumes of simulated groundwater containing 233 μg/L As(V) and As(III) were respectively treated before breakthrough. These results demonstrate the superiority of the FMCB in removing As(V) and As(III), indicating that it is a promising candidate for arsenic removal from real drinking water.
authors.affiliation: South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP), No. 7, West Street, Yuancun, Guangzhou 510655, China.
authors.forename: Jianying
authors.initials: J
authors.lastname: Qi
authors.affiliation: Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), 17th Chunhui Road, Yantai, Shandong 264003, China. Electronic address: gszhang@yic.ac.cn.
authors.forename: Gaosheng
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Environment and Material Engineering College, Yantai University, 32th Qingquan Road, Yantai 264005, China.
authors.forename: Haining
authors.initials: H
authors.lastname: Li
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry; D060587:Groundwater / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D060766:Drinking Water; D009930:Organic Chemicals; D010087:Oxides; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D008345:Manganese; D048271:Chitosan; D007501:Iron; D001151:Arsenic
keywords: Arsenic; Chitosan; Granular; Groundwater; Sorption