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二甲酸钾在A型沸石分子筛中的缓释行为

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Abstract:

将天然红辉沸石进行酸化处理制备沸石分子筛前驱体,于90~100℃晶化6h,无需模板剂制备出结构完整的A型沸石分子筛。将二甲酸钾负载在A型沸石分子筛中,得到沸石抗菌剂。考察了二甲酸钾溶液的初始浓度、pH值,反应时间和温度对二甲酸钾在A型沸石分子筛中的缓释行为的影响。结果表明A型沸石分子筛与初始质量浓度为40mg/mL的二甲酸钾在常温体系下进行吸附反应,反应时间3h,pH值6条件下,A型沸石分子筛吸附二甲酸钾饱和量为302mg/g;Fourier变换红外光谱中出现部分羧酸和羟基吸收峰,在695.78、763.07、1349和1383cm–1处出现振动峰,证实存在缔合过程;制备的沸石抗菌剂的部分抗菌期达到2~3d,具有缓释效应;吸附过程符合Freundlich等温方程。

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