突发氯苯污染的粉末活性炭吸附应急处理

Study on emergency treatment of powdered activated carbon absorption of sudden pollution of chlorobenzene

以PAC对氯苯的吸附性能及机理为研究对象.并建立了液液微萃取气相色谱快速测定水中氯苯方法,研究了两种PAC对水中氯苯的吸附动力学和吸附等温线,并采用了相应的模型对实验数据进行拟合,筛选出了合适的数学模型,同时考察了pH值、温度、离子强度对PAC吸附水中氯苯的影响结果表明PAC可以实现对水中氯苯的快速吸附,15 min对氯苯的吸附即可达标,Freundlich吸附等温式对吸附等温线实验数据拟合效果较好;水中pH值在PAC等电位点附近时,PAC对氯苯的吸附量较高;PAC对氯苯吸附是一放热过程,低温有利于PAC对氯苯的吸附;高离子强度时PAC对氯苯的吸附量较大.

Based on the establishment of method of determining chlorobenzene in water by liquid microextraction associated with gas chromatography and analysis on the adsorption kinetics and isotherms of chllorobenzene were conducted in water with 2 types of PAC. The optimal mathematical models were selected through the models used to fit the experiment data. At the same time, the effect of pH, temperature, ionic strength, on chlorobenzne adsorption on PAC was studied. The results showed that the rate of adsorption of ehlorobenzene on PAC in water was so rapid that can satisfy the water quality sandard in 15 rain. The adsorption isotherm can be fitted well with Freundlich model. PAC had a large adsorption capacity of ehlorobenzene when the pH value of water was closed to the isoeleetrie point of itself or the ionic strength was high enough in water. The adsorption of chlorobenzene on PAC was an thermic process. Temperature was conducive to PAC adsorption of ehlorobenzene ; high ionic strength when the PAC adsorption of large amount of chlorobenzene.