形成 tooeleite 和直接去除砷 (III) 从高砷酸性废水的作用。
Formation of tooeleite and the role of direct removal of As(III) from high-arsenic acid wastewater.
机构信息
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.
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
出版信息
J Hazard Mater. 2016 Dec 15;320:620-627. doi: 10.1016/j.jhazmat.2016.07.069. Epub 2016 Jul 29.
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.
在这项研究中，提出了一种类地方法，通过形成铁砷酸硫酸铁矿物 tooeleite，直接去除 As(III)。使用一系列批处理实验研究了 tooeleite 的形成与 As(III)去除之间的关系。结果表明，在 pH 值为 1.8-4.5、初始 As(III)浓度高于 0.75g/L、Fe/As 比为 0.8 至 2 的室温处理条件下，As(III)去除效率高达 99%。各种特性分析证实，该处理得到的沉淀物为具有较高稳定性的 tooeleite。此外，假设铁氢氧化物作为前驱体存在，这对 tooeleite 的形成和 As(III)的去除至关重要。本研究表明，形成 tooeleite 可能是一种从高砷酸性废水中直接去除 As(III)的替代方法。
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