叶蜡石的有机活化及其对对苯二酚的吸附

Organic Activation and Adsorption of Pyrophyllite for Hydroquinone

采用湿法活化工艺选择不同类型的有机活化剂对叶蜡石粉体进行了活化处理，并进行了对水中极性有机物对苯二酚的吸附实验。结果表明，有机活化处理后的叶蜡石能明显提高对对苯二酚的吸附能力，可使水溶液中对苯二酚的去除率从26．8％提高到83．1％。优选的叶蜡石原土的吸附条件为：室温，粒径〈7．9μm,pH值为6．05-6．25，固液比为1：8，振荡时间25min。叶腊石活化条件为：活化剂用量1％，活化温度75℃。活化时间2h；活化叶腊石的吸附条件为：室温，固液比为1：8，振荡时间为30min，溶液pH值为6—7。同时还利用XRD、IR和SEM等分析方法测试了改性前、后叶蜡石粉体的结构，并探讨了叶蜡石的活化机理。

Different organic reagents were selected to modify the pyrophyllite with wet activation technics, and the adsorption behavior of the modified pyrophyllite for polar hydroquinone in water was tested. The result states that the adsorption capacity of modified pyrophyllite powder is greatly increased in comparison with that of natural pyrophyllite. The modified pyrophyllite can adsorb 83.1% of hydroquinone molecules, while natural pyrophyllite did only 26. 8% of them. The optimized conditions of nature pyrophyllite adsorbing hydroquinone in water are particle size less than 7.9 μm, ratio of pyrophyllite to hydroquinone solution 1 ： 8, pH value of solutions 6. 05 -6.25 and reacting time 25 min. The optimized conditions ,of activation are reagents quantity 1%, temperature 75 ℃ and reacting time 2 h. The optimized conditions of modified pyrophyllite adsorbing hydroquinone in water are ratio of pyrophyllite to hydroquinone solution 1：8, pH value of solution 6 -7 and reacting time 30 min. Meanwhile, XRD, IR and SEM methods were used to characterise the structure of the sample, and the mechanisms of modification were discussed.