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环境化学  2015 

两种盐复合改性活性氧化铝对水中氟的吸附特性

Keywords: 改性活性氧化铝,氟,吸附,动力学,热力学

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Abstract:

采用Fe2(SO4)3和Al2(SO4)3两种盐对活性氧化铝进行改性,通过静态吸附实验,研究了改性活性氧化铝对水中氟离子的吸附特性及影响因素.改性后的活性氧化铝吸附容量显著提高,25℃下吸附容量达到6.25mg·g-1.改性活性氧化铝对氟的吸附动力学符合拟二级动力学模型,吸附等温线更符合Langmuir等温吸附规律.吸附过程ΔG00、ΔS0>0,表明改性吸附剂对氟的吸附是自发的,是吸热、熵增加的反应.吸附最佳pH值为6,吸附过程中,共存PO43-对吸附效果影响最大.

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