刘国^1,,
许小芳¹,
李知可¹,
陈西亮¹,
徐丽莎¹
1.成都理工大学环境学院，地质灾害防治与地质环境保护国家重点实验室，环境保护部水土协同控制与联合修复重点实验室，成都 610059
基金项目: 地质灾害防治与地质环境保护国家重点实验室自主研究课题自由探索项目（SKLGP2016Z008）

Removal pathway of nitrate from water by nano-iron-carbon and its kinetics

LIU Guo^1,,
XU Xiaofang¹,
LI Zhike¹,
CHEN Xiliang¹,
XU Lisha¹
1.Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, State Environmental Protection, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Environment, Chengdu University of Technology, Chengdu 610059,China

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摘要:为了研究纳米铁炭（NZVI/AC）体系去除硝酸盐的反应途径及其动力学，通过NZVI/AC、纳米铁（NZVI）、活性炭（AC）对硝酸盐的还原或吸附过程探讨微电解作用，反应前后NZVI/AC变化、氮种类变化、pH变化，以及NO3-和Fe2+的相互作用探讨其还原途径，对比不同条件下（NZVI/AC投加量、硝酸盐浓度、溶液初始pH、离子强度）的动力学规律。结果表明：NZVI/AC在去除硝酸盐的过程中存在协同作用且最终产物主要是NH4+，无论是在NZVI/AC不足或过量的情况下，准二级吸附动力学模型对于NO3-的去除和Langmuir-Hinshelwood模型对于NH4+的生成都能提供很好的拟合结果。
关键词: 纳米铁炭/
微电解/
水体硝酸盐去除/
动力学

Abstract:In order to study the reaction pathway and removal kinetics of nitrate from nano-zero-valent-iron (NZVI) system, the microelectrolysis of nitrates was studied by studying the reduction or adsorption of nitrates by NZVI, activated carbon (AC), and NZVI/AC. The change of nano-iron and nitrogen species and the interaction between NO3- and Fe2+was discussed. The results show that synergistic effect of NZVI/AC was involved in the removal of nitrate and the final product is mainly NH4+. The pseudo second order adsorption kinetic model can provide good fitting results for the removal of NO3- and the Langmuir-Hinshelwood model for the ammonia generation in the case of NZVI/AC limiting or excess.
Key words:nano-iron-carbon/
micro-electrolysis/
nitrate removal from water/
kinetics.

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刊出日期:2018-04-22

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纳米铁炭微电解去除水中硝酸盐途径及其动力学

刘国^1,,
许小芳¹,
李知可¹,
陈西亮¹,
徐丽莎¹
1.成都理工大学环境学院，地质灾害防治与地质环境保护国家重点实验室，环境保护部水土协同控制与联合修复重点实验室，成都 610059
基金项目: 地质灾害防治与地质环境保护国家重点实验室自主研究课题自由探索项目（SKLGP2016Z008）
关键词: 纳米铁炭/
微电解/
水体硝酸盐去除/
动力学
摘要:为了研究纳米铁炭（NZVI/AC）体系去除硝酸盐的反应途径及其动力学，通过NZVI/AC、纳米铁（NZVI）、活性炭（AC）对硝酸盐的还原或吸附过程探讨微电解作用，反应前后NZVI/AC变化、氮种类变化、pH变化，以及NO3-和Fe2+的相互作用探讨其还原途径，对比不同条件下（NZVI/AC投加量、硝酸盐浓度、溶液初始pH、离子强度）的动力学规律。结果表明：NZVI/AC在去除硝酸盐的过程中存在协同作用且最终产物主要是NH4+，无论是在NZVI/AC不足或过量的情况下，准二级吸附动力学模型对于NO3-的去除和Langmuir-Hinshelwood模型对于NH4+的生成都能提供很好的拟合结果。

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