title: Functionalized chitosan electrospun nanofiber for effective removal of trace arsenate from water.
abstract: An environment-friendly iron functionalized chitosan elctrospun nanofiber (ICS-ENF) was synthesized for trace arsenate removal from water. The ICS-ENF was fabricated by electrospinning a mixture of chitosan, PEO and Fe(3+) followed by crosslinking with ammonia vapor. The physicochemical properties of ICS-ENF were characterized by FESEM, TEM-EDX and XRD. The ICS-ENF was found to be highly effective for As(V) adsorption at neutral pH. The As(V) adsorption occurred rapidly and achieved equilibrium within 100 min, which was well fitted by pseudo-second-order kinetics model. The As(V) adsorption decreased with increased ionic strength, suggesting an outer-sphere complexation of As(V) on ICS-ENF. Freundlich model well described the adsorption isotherm, and the maximum adsorption capacity was up to 11.2 mg/g at pH 7.2. Coexisting anions of chloride and sulfate showed negligible influence on As(V) removal, but phosphate and silicate significantly reduced As(V) adsorption by competing for adsorption sites. FTIR and XPS analysis demonstrated -NH, -OH and C-O were responsible for As(V) uptake. ICS-ENF was easily regenerated using 0.003 M NaOH, and the removal rate remained above 98% after ten successively adsorption-desorption recycles. This study extends the potential applicability of electrospun nanofibers for water purification and provides a promising approach for As(V) removal from water.
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.|College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
authors: Ling-Li
authors: LL
authors: Min
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors: Lu-Bin
authors: LB
authors: Zhong
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors: Yu-Ming
authors: YM
authors: Zheng
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.|College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
authors: Qing
authors: Q
authors: Liu
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors: Zhi-Huan
authors: ZH
authors: Yuan
authors: Department of Chemical &Biomolecular Engineering, National University of Singapore, 21 Lower Kent Ridge Road, 119077, Singapore.
authors: Li-Ming
authors: LM
authors: Yang
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000737:chemistry / Q000633:toxicity*; D048271:Chitosan / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry; D057139:Nanofibers / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity; D018508:Water Purification
chemical_list: D001149:Arsenates; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D048271:Chitosan; C025657:arsenic acid