title: Strong enhancement of trace mercury removal from aqueous solution with sodium thiosulfate by in situ formed Mn-(hydr)oxides.
abstract: The effect of sodium thiosulfate (Na2S2O3) on trace mercury removal from aqueous solution by in situ MnOx was investigated. Removal efficiency was studied at different molar ratios of Na2S2O3/Mn (0, 0.264, 0.593 and 1.582) and under changes in Mn dosage, reaction time and pH conditions. Additionally, the ionic strength and the mercury removal amount were examined to evaluate the efficiency of trace mercury removal. The results indicated that the presence of thiosulfate clearly improved removal of mercury from solution, and that increases in the ionic strength enhanced removal in a certain range of thiosulfate concentration. At neutral conditions, the mercury removal amount reached to maximum of 64 μg/mg. It is proposed that the ability of thiosulfate to reduce some MnOx to Mn(2+) as well as transfer the uncharged mercury species to a negatively charged species [Formula: see text] improved trace mercury removal. The mechanism analysis revealed that ternary complexes or large aggregations may be formed because of surface complexation or electrostatic attraction.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: luxixin@outlook.com.
authors.forename: Xixin
authors.initials: X
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: hfxl-hit@163.com.
authors.forename: Xiaoliu
authors.initials: X
authors.lastname: Huangfu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: zhangxiang3007@163.com.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: ya-an90@hotmail.com.
authors.forename: Yaan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: majun@hit.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
mesh_terms: D006863:Hydrogen-Ion Concentration; D017895:Manganese Compounds / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D017669:Mercury Compounds / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry; D009994:Osmolar Concentration; D010087:Oxides / Q000737:chemistry*; D013885:Thiosulfates / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D017895:Manganese Compounds; D017669:Mercury Compounds; D009566:Nitrates; D010087:Oxides; D013885:Thiosulfates; D014874:Water Pollutants, Chemical; C029948:mercury nitrate; C027424:manganese oxide; D008628:Mercury; C017717:sodium thiosulfate
keywords: Manganese oxides; Thiosulfate; Trace mercury