OH<sup>-</sup>浓度对地下水中铁碳酸盐沉淀形成的影响

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摘要

铁的碳酸盐沉淀是Fe⁰-PRB运行过程中最为常见的铁腐蚀产物，其对Fe⁰-PRB的长期运行有重要的影响.探究这类沉淀产物形成的环境条件，可为控制Fe表面碳酸盐沉淀的生成提供重要依据.本文以FeCl₂、NaOH、Na₂CO₃为反应物，考察了缺氧条件下不同[OH^-]=0.02， 0.06，0.1mol/L及R=[Fe²⁺]/[OH^-]、R'=[CO₃²^-]/[OH^-]对铁的碳酸盐沉淀生成情况的影响.结果表明，不同实验条件下检测到了FeCO₃、Fe₂（OH）₂CO₃及Fe₆（OH）₁₂CO₃三种铁的碳酸盐沉淀.Fe₆（OH）₁₂CO₃仅能在低浓度[OH^-]=0.02mol/L时生成，高浓度的OH^-条件下不能生成.Fe₂（OH）₂CO₃在较低的OH^-浓度，较小的R条件下生成；较高的OH^-浓度，较大的R同样有利于Fe₂（OH）₂CO₃的生成.FeCO₃仅在[OH^-]=0.02mol/L，[Fe²⁺]、[CO₃²^-]均较低情况下与Fe₂（OH）₂CO₃共同生成.

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	陈日
	罗凌云
	洪梅
	张文静
	张峻豪

关键词 ： FeCO₃, Fe₂(OH)₂CO₃, Fe₆(OH)₁₂CO₃, OH^-浓度

Abstract：

Iron Carbonate precipitation is the most common corrosion products during the process of Fe⁰-PRB operation, which have important influence on the long-term operation of Fe⁰-PRB. Exploring the precipitate formation condition can provide vital evidence to controll its formation on the Fe surface. Experiments were conducted in FeCl₂, NaOH, and Na₂CO₃ solutions to investigate the effect of different OH^- concentration (0.02、0.06、0.1mol/L) and R=[Fe²⁺]/[OH^-]、R'=[CO₃²^-]/[OH^-] on the precipitate formation under anaerobic conditions. FeCO₃、Fe₂(OH)₂CO₃ and Fe₆(OH)₁₂CO₃ were detected under the different experimental conditions, Fe₆(OH)₁₂CO₃ can formation in the low concentration [OH^-]=0.02mol/L and not formation in the high OH^- concentration solutions. The low OH^- concentration and low R, high OH^-concentration and large R have positive effect on the formation of Fe₂(OH)₂CO₃. FeCO₃ just be detected and precipitated with Fe₂(OH)₂CO₃ in the system with low concentrations of Fe²⁺、CO₃²^-、OH^-.

Key words： FeCO₃ Fe₂(OH)₂CO₃ Fe₆(OH)₁₂CO₃ OH^- concentration

收稿日期: 2015-12-20

X132.1

基金资助:

国家自然科学基金项目（41102146，41530636）

通讯作者: 洪梅,教授,hongmei@jlu.edu.cn E-mail: hongmei@jlu.edu.cn

作者简介: 陈日(1989-),女,内蒙古赤峰人,硕士研究生,研究方向为污染场地控制与修复.

引用本文:

陈日, 罗凌云, 洪梅, 张文静, 张峻豪. OH^-浓度对地下水中铁碳酸盐沉淀形成的影响[J]. 中国环境科学, 2016, 36(7): 2051-2057. CHEN Ri, LUO Ling-yun, HONG Mei, ZHANG Wen-jing, ZHANG Jun-hao. Investigation of the effect of OH^- concentration on the formation of iron carbonate precipitation in groundwater.. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(7): 2051-2057.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2016/V36/I7/2051

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