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改性花生壳对苯酚的吸附

Keywords: 花生壳,苯酚,吸附剂,吸附动力学,吸附热力学

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Abstract:

以花生壳为原料,使用环氧氯丙烷、二甲胺及吡啶,以N,N-二甲基甲酰胺为反应介质改性花生壳。结果表明:改性花生壳对苯酚的去除效果优于未改性花生壳。在实验条件下,吸附剂的吸附量在溶液pH为9,吸附时间为120min时达到最大;溶液离子强度对吸附的影响较大。分析了该反应体系的动力学和热力学参数,改性花生壳吸附苯酚过程拟用准二级动力学模型处理,计算得出平衡吸附量与实验值相符。改性花生壳对苯酚的吸附符合Langmuir和Freundlich等温模式,R2均大于0.98,Qmax在84.49~108.76mg/g之间,Freundlich模式的吸附强度n值在1.211~1.262之间,热力学参数△G、△H、△S表明改性花生壳对苯酚的吸附过程是自发、吸热过程。

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