改性土壤对模拟含硝基苯废水的吸附

SORPTION OF NITROBENZENE IN SIMULATED NITROBENZENE POLLUTED WATER BY MODIFIED SOILS

研究了季铵盐阳离子表面活性剂四甲基铵离子 (TMA)和十六烷基三甲基铵离子(HDTMA)改性的土壤 (黑土、黄棕壤、红壤 )对水中硝基苯的吸附作用 .结果表明 :改性土壤和未改性土壤均能吸附水中的硝基苯 .但改性土壤对水中硝基苯的吸附能力明显高于未改性土壤 .改性土壤吸附硝基苯能力的顺序为 1CEC HDTMA黑土>1CEC HDTMA黄棕壤 >0 7CEC HDTMA黄棕壤 >1CEC HDTMA红壤 >0 7CEC HDTMA红壤 >1CEC TMA黄棕壤 >1CEC TMA红壤 .未改性土壤和HDTMA改性土壤对硝基苯的吸附通过分配来进行 ,吸附等温线可用Henry方程表示 ,其lgKSOM 为2 2 7,lgKHDTMA为 2 87.

Quaternary ammonium compounds (QAC)hexadecylrrinethylammonium(HDTMA)was used to treat three kinds of natural soils (black soil,yellow-brown soil and red soil)and sorption of nitrobenzene in water by these soils was studied.The modified soils had shown better sorption capacity than natural soils.The order of sorption effect of modified soils was:1 CEC-HDTMA black soil>1 CEC-HDTMA yellow-brown soil>0.7 CEC-HDTMA yellow-brown soil>1 CEC-HDTMA red soil>0.7 CEC-HDTMA red soil>1 CEC-TMA yellow-brown soil>1 CEC-TMA red soil.Sorption of nitrobenzene by natural soils and HDTMA modified soil is via partition,the sorption isotherms can be expressed by Henry equation and lgK SOM is 2.27,lgK HDTMA is 2.87.