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环境化学  2015 

吸附模式对有机物光催化降解的影响1.H-酸在TiO2表面的吸附模式

Keywords: H-酸,TiO2,吸附模式,饱和吸附量,吸附不可逆性

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Abstract:

H-酸萘环上含有的两个磺酸基团,在水溶液中可以解离一个或者两个.pH2.5条件下,主要有一个磺酸基团解离,此时,H-酸通过一个磺酸基团吸附在TiO2表面,占位小,饱和吸附量大,但吸附键较弱,吸附较可逆.pH5.0条件下,主要有两个磺酸基团解离,此时,H-酸通过两个磺酸基团吸附在TiO2表面,占位大,饱和吸附量小,但吸附键较强,吸附不可逆性较强.这种吸附模式的差异是导致H-酸在不同pH条件下饱和吸附量和吸附不可逆性差异的根本原因,也是导致不同pH条件下H-酸具有不同光催化降解途径的重要原因.

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