title: Rapid oxidation and immobilization of arsenic by contact glow discharge plasma in acidic solution.
abstract: Arsenic is a priority pollutant in aquatic ecosystem and therefore the remediation of arsenic-bearing wastewater is an important environmental issue. This study unprecedentedly reported simultaneous oxidation of As(III) and immobilization of arsenic can be achieved using contact glow discharge process (CGDP). CGDP with thinner anodic wire and higher energy input were beneficial for higher As(V) production efficiency. Adding Fe(II) in CGDP system significantly enhanced the oxidation rate of As(III) due to the generations of additional OH and Fe(IV) species, accompanied with which arsenic can be simultaneously immobilized in one process. Arsenic immobilization can be favorably obtained at solution pH in the range of 4.0-6.0 and Fe(II) concentration from 250 to 1000 μM. The presence of organics (i.e., oxalic acid, ethanol and phenol) retarded the arsenic immobilization by scavenging OH or complexing Fe(III) in aqueous solution. On the basis of these results, a mechanism was proposed that the formed ionic As(V) rapidly coprecipitated with Fe(III) ions or was adsorbed on the ferric oxyhydroxides with the formation of amorphous ferric arsenate-bearing ferric oxyhydroxides. This CGDP-Fenton system was of great interest for engineered systems concerned with the remediation of arsenic containing wastewater.
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China.
authors.forename: Ping
authors.initials: P
authors.lastname: Hu
authors.affiliation: Bei Jing Sinen En-Tech Co., Ltd, Beijing 100080, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China. Electronic address: jtzheng03@163.com.
authors.forename: Jingtang
authors.initials: J
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China.
authors.forename: Minghui
authors.initials: M
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China. Electronic address: wumb@upc.edu.cn.
authors.forename: Mingbo
authors.initials: M
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, PR China.
authors.forename: Qinzhong
authors.initials: Q
authors.lastname: Xue
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D004572:Electrolysis / Q000379:methods*; D005290:Ferric Compounds; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001151:Arsenic; D005290:Ferric Compounds; D062065:Wastewater; D014874:Water Pollutants, Chemical; C092844:ferric oxyhydroxide
keywords: As(III) oxidation; Fenton; Ferric arsenate; Glow discharge plasma; Immobilization