Photoreductive Dissolution of Schwertmannite with Incorporated As(Ⅴ) Induced by Oxalate and the Mobilization of As(Ⅴ)  

作　　者：Zhaoyang Ji Haitao Ren Shaoyi Jia Songhai Wu 

机构地区：[1]School of Chemical Engineering and Technology , Tianjin University [2]State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles , Tianjin Polytechnic University

出　　处：《Transactions of Tianjin University》2019年第3期258-265,共8页天津大学学报（英文版）

基　　金：supported by the Science and Technology Plans of Tianjin (No. 15PTSYJC00230);Tianjin Research Program of Application Foundation and Advanced Technology (No. 17JCQNJC08000);the National Natural Science Foundation of China (Nos. 41373114 and 41201487)

摘　　要：Schwertmannite(Sh), a poorly crystalline iron(hydr)oxide that usually appears in acid mine drainage, plays a significant role in the immobilization of As(V). In this study, the effects of UV irradiation and oxalate on the dissolution of Sh with structurally incorporated As(V) [Sh-As(V)] and the subsequent mobilization of As(V) were investigated at pH 3.0. In the dark, more total dissolved Fe was produced(the maximum value was 33.2 mg/L) in the suspensions of Sh-As(V) with oxalate than in those without oxalate. UV irradiation slightly enhanced the mobilization of As(V) for the system of Sh-As(V)-1 and Sh-As(V)-2 in the absence of oxalate compared with that in the dark. However, in the presence of oxalate, UV irradiation caused the concentration of mobilized As(V) to decline by 630-875% compared with that in the dark. This study enhanced our understanding of the mobilization of As(V) and demonstrated that UV irradiation could contribute to the immobilization of As(V) on Sh in aqueous environments containing oxalate.Schwertmannite(Sh), a poorly crystalline iron(hydr)oxide that usually appears in acid mine drainage, plays a significant role in the immobilization of As(V). In this study, the effects of UV irradiation and oxalate on the dissolution of Sh with structurally incorporated As(V) [Sh-As(V)] and the subsequent mobilization of As(V) were investigated at pH 3.0. In the dark, more total dissolved Fe was produced(the maximum value was 33.2 mg/L) in the suspensions of Sh-As(V) with oxalate than in those without oxalate. UV irradiation slightly enhanced the mobilization of As(V) for the system of Sh-As(V)-1 and Sh-As(V)-2 in the absence of oxalate compared with that in the dark. However, in the presence of oxalate, UV irradiation caused the concentration of mobilized As(V) to decline by 630-875% compared with that in the dark. This study enhanced our understanding of the mobilization of As(V) and demonstrated that UV irradiation could contribute to the immobilization of As(V) on Sh in aqueous environments containing oxalate.

关 键 词：SCHWERTMANNITE Photoreductive DISSOLUTION OXALATE As(Ⅴ) MOBILIZATION 

分 类 号：T[一般工业技术]