title: Formation of tooeleite and the role of direct removal of As(III) from high-arsenic acid wastewater.
abstract: In this study, an earth-mimetic method was proposed for the direct removal of As(III) by the formation of tooeleite, a ferric arsenite sulfate mineral. A series of batch experiments was used to study the relationship between the formation of tooeleite and the removal of As(III). The results indicate that As(III) removal efficiency reached up to 99% under the treatment condition of pH 1.8-4.5, initial As(III) concentration higher than 0.75g/L, and Fe/As ranged from 0.8 to 2 at room temperature. Various characterizations confirm that the precipitate obtained by this treatment was tooeleite with relatively high stability. In addition, it is assumed that ferrihydrite exists as a precursor, which is vital to the formation of tooeleite and the removal of As(III). This study suggests that tooeleite formation may be an alternative method in the direct removal of As(III) from high-arsenic acid wastewater.
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Chai
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, China.
authors.forename: Mengqing
authors.initials: M
authors.lastname: Yue
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, China.
authors.forename: Jinqin
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China. Electronic address: qw_wang@csu.edu.cn.
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Wang
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China. Electronic address: qingzhuli@csu.edu.cn.
authors.forename: Qingzhu
authors.initials: Q
authors.lastname: Li
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
keywords: Acid wastewater; Arsenite; Ferrihydrite; Tooeleite