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银改性壳聚糖/膨润土吸附剂表征及气态汞脱除特性

, PP. 18-24

Keywords: 壳聚糖,膨润土,,吸附剂,脱汞

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Abstract:

应用VM3000在线测汞仪为检测手段,在固定床实验台架上以银(Ag)改性壳聚糖(chitosan,CTS)/膨润土(bentonite,B)为吸附剂开展了单质汞(Hg0)的脱除研究。采用N2吸附/脱附、傅里叶变换红外(Fouriertransforminfra-redspectroscopy,FTIR)和X-射线衍射(X-raydiffraction,XRD)等方法对吸附剂进行结构表征。研究发现,改性后活性银成功负载在吸附剂上,致使壳聚糖及其负载膨润土吸附剂的比表面积发生不同程度的减小;FTIR分析表明CTS和Ag进入膨润土的层状结构,并与膨润土的羟基官能团和Si-O-Si伸缩振动峰发生反应;负载Ag后,吸附剂在2θ=38°处出现了银的特征衍射峰。由于集合了壳聚糖和膨润土两者的优点,壳聚糖的添加可以提高银改性膨润土的脱汞效率。脱汞实验表明SO2和HCl对吸附剂的脱汞效率影响不大,而NO和H2O可较大地促进吸附剂的脱汞能力。

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