硅烷化活性炭对水中有机污染物的吸附作用

Adsorption of Organic Pollutants on Silylated Activated Carbon from Water

利用三甲基氯硅烷(TMCS)对活性炭进行表面改性,研究了改性活性炭对水中苯胺、硝基苯及苯甲酸等典型有机污染物的吸附性能及特性;通过BET对吸附剂进行表征。结果表明,硅烷化改性后活性炭对水中的苯胺、硝基苯、苯甲酸的吸附容量有明显提高,空白活性炭对3种有机物的吸附容量分别为90.6 mg/g,9.6 mg/g,19.6 mg/g,改性192h的活性炭对3种有机物的吸附容量增加为113.5 mg/g,14.4 mg/g,26.9 mg/g;吸附容量随硅烷化改性时间的延长而增加;改性活性炭对苯胺、硝基苯、苯甲酸具有吸附选择性,吸附能力大小顺序为:苯胺>苯甲酸>硝基苯。

In this paper,activated carbon was modified with trimethylchlorosilane(TMCS).The isotherms of aniline,nitrobenzene and benzoic acid from aqueous solution on TMCS silylated activated carbon were determined;sorbent were characterized by BET.The results showed that: adsorption capacities of aniline,nitrobenzene and benzoic acid onto the silylated activated carbon increased greatly.The adsorption capacities of virgin activated carbon toward three organic compounds was 90.6 mg/g,9.6 mg/g and 19.6 mg/g,respective...