纳米零价铁去除饮用水中砷(III)和砷(V)的研究

2010 International Conference on Challenges in Environmental Science and Computer Engineering Pub Date : 2010-03-06 DOI:10.1109/CESCE.2010.232

Yuanying Huang, Keyan Tan, Qifeng Tang, Fei Liu, Dandan Liu

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引用次数: 5

摘要

在实验室合成了纳米级零价铁(NZVI)，用于去除As(III)(亚砷酸盐)和As(V)(砷酸盐)。颗粒的平均BET表面积为49.16 m2/g，直径在20 ~ 40nm之间。通过间歇式和柱式实验研究了NZVI对砷的吸附动力学和除砷效率。结果表明，在pH为7,22±1℃的条件下，NZVI对砷酸盐和亚砷酸盐均有较好的去除效果。0.25g NZVI在60 min内对As(¿)和As(V)的去除率达到99.5%以上。砷的吸附过程符合准一级动力学表达式。As(III)的表面积归一化速率系数kSA为3.42mL/m2•min。结果表明，NZVI具有较高的反应活性，是处理含砷饮用水的较好吸附剂。

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Removal of As(III) and As(V) from Drinking Water by Nanoscale Zero-valent Iron

Nanoscale zero-valent iron (NZVI) was synthesized in the laboratory for the removal of As(III) (arsenite) and As(V) (arsenate). Average BET surface areas of the particles was 49.16 m2/g, with diameter in the range of 20-40nm. Batch and column experiments were conducted to investigate adsorption kinetics and efficiency of arsenic removal with NZVI. The results showed that both arsenate and arsenite could be removed efficiently by NZVI at pH 7, 22±1 °C. The removal rate for As(¿) and As(V) was over 99.5% within 60 min using 0.25g NZVI. The arsenic adsorption process followed the pseudo-first-order kinetic expression. The surface-area-normalized rate coefficient kSA was 3.42mL/m2•min for As(III). Based on the result, NZVI is a suitable sorbent to treat the drinking water containing arsenic due to its high reactivity.

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2010 International Conference on Challenges in Environmental Science and Computer Engineering

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