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猪粪制备的生物炭对西维因的吸附与催化水解作用

Keywords: 生物炭,猪粪,西维因,吸附,催化水解

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Abstract:

以猪粪为原料,在不同温度下制备生物炭,并对其进行除灰处理,研究了不同处理温度和灰分含量的生物炭与西维因的相互作用。猪粪制备的生物炭含有无机矿物、不定型有机质和结晶态芳香碳,且随处理温度升高,灰分含量增加,BET比表面积增加。生物炭对西维因的吸附表现为非线性,等温线符合Freundlich方程,且随生物炭制备温度的升高,非线性增强。生物炭除灰后,吸附作用大大增强,表明有机碳与无机成分复合造成其一部分吸附点位的损失。生物炭对西维因的吸附由亲脂性分配与特殊作用力构成,随着生物炭不同以及西维因浓度的变化,吸附机制发生变化。生物炭可提高溶液pH,pH随生物炭添加量和处理温度而升高,生物炭含有的矿物对西维因水解具有催化作用,其水解速率及程度与生物炭灰分含量呈正相关。

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