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氨基化凹土对水中焦性没食子酸的吸附

Keywords: 氨基化凹土,焦性没食子酸,吸附动力学,等温线

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Abstract:

采用氨基硅烷偶联剂(γ-氨丙基三乙氧基硅烷)改性凹凸棒石黏土(以下简称"凹土")为吸附剂,通过静态吸附研究其对模拟废水中焦性没食子酸的吸附性能。结果表明,γ-氨丙基三乙氧基硅烷改性凹土能有效提高凹土的吸附性能,改性凹土吸附50mL,浓度为100mg/L焦性没食子酸较理想的条件为吸附剂用量0.4g、吸附温度20℃、吸附时间40min、体系pH5.2。通过静态吸附实验数据计算分析得知,拟二级动力学模型比拟一级动力学模型能更好地描述改性凹土对焦性没食子酸的吸附动力学行为,改性凹土对焦性没食子酸的吸附更符合Langmuir等温式,其饱和吸附量为19.861mg/g。

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