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环境化学  2015 

水体中δ-MnO2表面质子交换规律及影响因素

Keywords: δ-MnO2,质子交换,影响因素

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Abstract:

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.

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