水体中δ-MnO2表面质子交换规律及影响因素

毕峰; 朱丽珺; 张金池; 杨聪; 钱洁尘; 孙瑞健

环境化学

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毕峰, 朱丽珺, 张金池, 杨聪, 钱洁尘, 孙瑞健. 水体中δ-MnO2表面质子交换规律及影响因素[J]. 环境化学, 2012, 31(11): 1775-1781.

引用本文:

毕峰, 朱丽珺, 张金池, 杨聪, 钱洁尘, 孙瑞健. 水体中δ-MnO2表面质子交换规律及影响因素[J]. 环境化学, 2012, 31(11): 1775-1781.

BI Feng, ZHU Lijun, ZHANG Jinchi, YANG Cong, QIAN Jiechen, SUN Ruijian. Laws and influence factors of surface proton exchange of δ-MnO2 in water[J]. Environmental Chemistry, 2012, 31(11): 1775-1781.

Citation:

BI Feng, ZHU Lijun, ZHANG Jinchi, YANG Cong, QIAN Jiechen, SUN Ruijian. Laws and influence factors of surface proton exchange of δ-MnO2 in water[J]. Environmental Chemistry, 2012, 31(11): 1775-1781.

水体中δ-MnO2表面质子交换规律及影响因素

1.
南京林业大学森林资源与环境学院, 南京, 210037;
2.
南京林业大学理学院, 南京, 210037
基金项目:
国家林业局"948"项目(2008-4-40)

江苏高校优势学科建设工程资助项目资助.

Laws and influence factors of surface proton exchange of δ-MnO2 in water

1.
College of Forest Resources and Environment;
2.
College of Sciences, Nanjing Forestry University, Nanjing, 210037, China
Fund Project:

摘要: 系统研究了水热合成的δ-MnO2在不同环境影响因素条件下质子交换的规律与机理.研究结果表明,在电解质(NaCl)溶液中,δ-MnO2对水体中H+有吸附作用,且吸附量与电解质浓度呈负相关,电解质阴离子对H+的交换作用影响小,Mg2+因可形成二齿螯合物而比Na+释放更多H+;温度对H+的交换影响也小;pH初始值能影响δ-MnO2的表面结构,使表面质子解离,酸性条件下对H+的吸附大于释放作用,碱性条件时则释放大于吸附作用;络合剂EDTA和NTA存在时对δ-MnO2表面吸附H+有利,络合剂浓度达到一定值时,δ-MnO2对H+吸附量趋于定值;重金属离子Pb2+、Cr3+及Co2+与δ-MnO2发生作用的机理不同,对H+的交换过程影响也不同.
- δ-MnO₂ /
- 质子交换 /
- 影响因素
Abstract: The surface proton exchange processes of hydrous manganese dioxide (δ-MnO2) in water were systematically investigated under different environmental factors. Results showed δ-MnO2 mainly had adsorption effect on the hydrogen ions from electrolyte solutions and the amounts of adsorbed H+ decreased with ionic strength increasing. In addition, cations have more effect on the proton exchange than anions in different electrolytes. Mg2+ which could form a bidentate complex on the surface of δ-MnO2 released more H+ than Na+. Environmental temperature had little effect on the proton exchange, while the initial value of pH affect the surface charge of δ-MnO2. The sum of adsorption protons was more than that of release, which was opposite in alkaline conditions. The presence of chelating agents of EDTA and NTA could promote the adsorption of the H+ on δ-MnO2, and the adsorption amounts reached a maximum at a certain value then remained steady. There were different mechanisms of the adsorption of heavy metals (Pb2+, Cr3+ and Co2+) on δ-MnO2, which had different influence on the surface proton exchange on δ-MnO2.
- δ-MnO₂ /
- surface proton exchange /
- influence factors

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毕峰, 朱丽珺, 张金池, 杨聪, 钱洁尘, 孙瑞健. 水体中δ-MnO2表面质子交换规律及影响因素[J]. 环境化学, 2012, 31(11): 1775-1781.

引用本文:

毕峰, 朱丽珺, 张金池, 杨聪, 钱洁尘, 孙瑞健. 水体中δ-MnO2表面质子交换规律及影响因素[J]. 环境化学, 2012, 31(11): 1775-1781.

BI Feng, ZHU Lijun, ZHANG Jinchi, YANG Cong, QIAN Jiechen, SUN Ruijian. Laws and influence factors of surface proton exchange of δ-MnO2 in water[J]. Environmental Chemistry, 2012, 31(11): 1775-1781.

Citation:

水体中δ-MnO2表面质子交换规律及影响因素

1. 南京林业大学森林资源与环境学院, 南京, 210037;
2. 南京林业大学理学院, 南京, 210037

收稿日期: 2011-12-06

基金项目:

国家林业局"948"项目(2008-4-40)

江苏高校优势学科建设工程资助项目资助.

关键词:

δ-MnO₂ /
质子交换 /
影响因素

摘要: 系统研究了水热合成的δ-MnO2在不同环境影响因素条件下质子交换的规律与机理.研究结果表明,在电解质(NaCl)溶液中,δ-MnO2对水体中H+有吸附作用,且吸附量与电解质浓度呈负相关,电解质阴离子对H+的交换作用影响小,Mg2+因可形成二齿螯合物而比Na+释放更多H+;温度对H+的交换影响也小;pH初始值能影响δ-MnO2的表面结构,使表面质子解离,酸性条件下对H+的吸附大于释放作用,碱性条件时则释放大于吸附作用;络合剂EDTA和NTA存在时对δ-MnO2表面吸附H+有利,络合剂浓度达到一定值时,δ-MnO2对H+吸附量趋于定值;重金属离子Pb2+、Cr3+及Co2+与δ-MnO2发生作用的机理不同,对H+的交换过程影响也不同.

English Abstract

Laws and influence factors of surface proton exchange of δ-MnO2 in water

1. College of Forest Resources and Environment;
2. College of Sciences, Nanjing Forestry University, Nanjing, 210037, China

Received Date: 2011-12-06

Fund Project:

Keywords:

Abstract: The surface proton exchange processes of hydrous manganese dioxide (δ-MnO2) in water were systematically investigated under different environmental factors. Results showed δ-MnO2 mainly had adsorption effect on the hydrogen ions from electrolyte solutions and the amounts of adsorbed H+ decreased with ionic strength increasing. In addition, cations have more effect on the proton exchange than anions in different electrolytes. Mg2+ which could form a bidentate complex on the surface of δ-MnO2 released more H+ than Na+. Environmental temperature had little effect on the proton exchange, while the initial value of pH affect the surface charge of δ-MnO2. The sum of adsorption protons was more than that of release, which was opposite in alkaline conditions. The presence of chelating agents of EDTA and NTA could promote the adsorption of the H+ on δ-MnO2, and the adsorption amounts reached a maximum at a certain value then remained steady. There were different mechanisms of the adsorption of heavy metals (Pb2+, Cr3+ and Co2+) on δ-MnO2, which had different influence on the surface proton exchange on δ-MnO2.

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水体中δ-MnO2表面质子交换规律及影响因素

Laws and influence factors of surface proton exchange of δ-MnO2 in water

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水体中δ-MnO2表面质子交换规律及影响因素

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Laws and influence factors of surface proton exchange of δ-MnO2 in water

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