title: Akaganeite decorated graphene oxide composite for arsenic adsorption/removal and its proconcentration at ultra-trace level.
abstract: Carboxylic graphene oxide (GO-COOH) is decorated with akaganeite (β-FeOOH) to produce a β-FeOOH@GO-COOH nanocomposite. The nanocomposite acts as an efficient adsorption medium for the uptake of arsenite and arsenate within a wide range of pH 3-10, providing high adsorption capacities of 77.5mgg(-1) for As(III) and 45.7mgg(-1) for As(V), respectively. Adsorption efficiencies of 100% and 97% are achieved for 5 successive operation cycles for the removal of 100μgL(-1) As(V) and As(III) in 5 fresh portions of aqueous solution (1.0mL for each) with 3mg nanocomposite. After 20 successive adsorption cycles, removal efficiency of >80% is still maintained for both arsenate and arsenite. Further, a removal efficiency of >90% is obtained for 1000μgL(-1) As(V) with 3mg β-FeOOH@GO-COOH for 5 successive adsorption cycles, and the presence of 2000-fold SO4(2-), NO3(-), Cl(-) and Mg(2+) pose no interfering effect. β-FeOOH@GO-COOH also provides a promising medium for the preconcentration of ultra-trace inorganic arsenic. 1mg of nanocomposite is used to adsorb 0.1-3.00μgL(-1) As(V) in 4.0mL solution, and the retained arsenate is recovered by 400μL of NaOH (2molL(-1), containing 2.0% NaBH4), followed by detection with atomic fluorescence spectrometry. A detection limit of 29ngL(-1) is obtained for arsenate. This procedure is validated by analyzing arsenic in a certified reference material (GBW 09101b) and further applied for arsenic determination in water samples.
authors: Research Center for Analytical Sciences, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China.
authors: Ming-Li
authors: ML
authors: Chen
authors: Research Center for Analytical Sciences, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China.
authors: Yan
authors: Y
authors: Sun
authors: Research Center for Analytical Sciences, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China.
authors: Chun-Bao
authors: CB
authors: Huo
authors: Research Center for Analytical Sciences, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China.
authors: Chen
authors: C
authors: Liu
authors: Research Center for Analytical Sciences, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China. Electronic address: jianhuajrz@mail.neu.edu.cn.
authors: Jian-Hua
authors: JH
authors: Wang
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis*; D018053:Arsenites / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007287:Inorganic Chemicals; D008855:Microscopy, Electron, Scanning; D008968:Molecular Conformation; D010087:Oxides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D018053:Arsenites; D005290:Ferric Compounds; D007287:Inorganic Chemicals; D010087:Oxides; D014874:Water Pollutants, Chemical; C473845:akaganeite; D014867:Water; C000499:ferric oxide; D006108:Graphite; C015001:arsenite; D001151:Arsenic
keywords: Akaganeite/graphene oxide composite; Arsenic removal; Atomic fluorescence spectrometry; Preconcentration; Solid phase extraction