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US/Zn0体系降解水中的对硝基苯甲酸

Keywords: 对硝基苯甲酸,超声波,单质锌,拟一级速率降解常数

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Abstract:

为高效去除水体中的对硝基苯甲酸、开发新型水处理技术,提出以超声与单质锌联用降解水中的对硝基苯甲酸。考察了锌投加量、溶液初始pH、声功率及溶液初始浓度对拟一级反应速率常数(kUS/Zn0)的影响,比较了US、Zn0和US/Zn03体系下的降解常数,并对US/Zn0体系的降解机理进行了初探。结果表明,以上4种因素对kUS/Zn0均有很大影响,kUS/Zn0分别在溶液初始pH为5、声功率为120W、溶液初始浓度为0.04mmol/L时达到最大值,且随着锌投加量的增加而增加。超声与单质锌在降解对硝基苯甲酸的过程中存在很好的协同作用,在最优条件下,kUS/Zn0=0.052min-1,分别是单独超声降解及单独锌降解的21.5倍和2.53倍。在联用体系中,主要是依靠OH·氧化及单质锌还原的相互加强来去除对硝基苯甲酸。

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