颗粒活性炭载纳米零价铁去除水中的Cr(VI)

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刘剑*，黄莉，彭钢，易正戟

衡阳师范学院功能金属有机化合物湖南省重点实验室，湖南衡阳 421008

收稿日期:2018-09-28修回日期:2019-01-03出版日期:2019-08-22发布日期:2019-08-15
通讯作者:刘剑

基金资助:利用铁还原菌溶矿作用阻滞Fe(0) -PRB的钝化和促进铀尾矿渗滤液中铀酰的去除;微纤包覆活性炭-纳米零价铁复合材料对含铅废水修复研究

Removal of Cr(VI) from water by granular activated carbon supported nanoscale zero-valent iron

Jian LIU*, Li HUANG, Gang PENG, Zhengji YI

Key Laboratory of Functional Metal?Organic Compounds of Hunan Province, Hengyang Normal University, Hengyang, Hunan 421008, China

Received:2018-09-28Revised:2019-01-03Online:2019-08-22Published:2019-08-15
Contact:LIU Jian

摘要/Abstract

摘要： 以Fe2+溶液为原料、NaBH4为还原剂，采用传统液相还原技术合成了颗粒活性炭(GAC)载纳米零价铁(nZVI)复合材料GAC-nZVI，用扫描电镜对GAC-nZVI进行表征，通过间歇实验考察了其对去除Cr(VI)的影响。结果表明，GAC能阻止nZVI颗粒聚集，合成的GAC-nZVI能有效去除水中的Cr(VI)。在Cr(VI)初始浓度50 mg/L、温度40℃和pH=2.0、投加GAC-nZVI 3.0 g/L的条件下反应5 min，Cr(VI)去除率为99.4%。pH=2.0?4.0时，处理后水中总铬浓度均低于1 mg/L，表明残留少量Cr(III)。随pH值和Cr(VI)浓度增加，Cr(VI)去除率降低；随反应温度和GAC-nZVI投加量增加，Cr(VI)去除率增加。准一级动力学模型可用于描述Cr(VI)的去除过程。相同条件下，GAC-nZVI去除Cr(VI)的反应速率常数达0.19797 min?1，为原颗粒活性炭反应速率常数0.0023 min?1的86倍。随pH值降低或反应温度和GAC-nZVI投加量增加，反应速率常数增加。

引用本文

刘剑黄莉彭钢易正戟. 颗粒活性炭载纳米零价铁去除水中的Cr(VI)[J]. 过程工程学报, 2019, 19(4): 714-720.
Jian LIU Li HUANG Gang PENG Zhengji YI. Removal of Cr(VI) from water by granular activated carbon supported nanoscale zero-valent iron[J]. Chin. J. Process Eng., 2019, 19(4): 714-720.

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