顶空气相色谱测试水中苯系混合物在不同材料上的吸附行为

设计了正交实验对5种材料吸附模拟废水中苯系混合物(苯、甲苯、二甲苯)的条件进行优化,CD02硅藻土与X型纳米分子筛以2∶1(质量比)进行复合后,对苯系混合物去除效果最好.采用顶空气相色谱法测定8种不同材料对水中苯系混合物的去除情况,结果表明复合材料对苯系混合物具有良好的去除效果,仅次于活性炭.复合材料在pH为7、搅拌时间为25 min、用量为1.8g/L时,对苯系混合物质量浓度为4.0 mg/L模拟废水的平均去除率为87.56％.经过4次再生后,复合材料的再生率仍高达84.90％,对苯系混合物的平均去除率为91.49％.

Study on the adsorption behavior of benzene mixture in water on different materials by headspace gas chromatography

The orthogonal experiment was designed to optimize the adsorption of benzene mixture(benzene,toluene,xylene) by five kinds of materials.The results showed that the compound of CD02 diatomite and X-nano zeolite with the mixing ratio of 2: 1 was the best composite material for removal of benzene mixture in water.The adsorption behavior of 8 adsorbent for benzene mixture was analyzed with the help of headspace gas chromatography,the obtained composite material presented perfect adsorption capacity,which was only inferior to activated carbon.The performance of regenerated composite material was also detected.It was found that under the pH of 7,the stirring time of 25 min,the composite material dosage of 1.8 g/L,initial concentration of benzene mixture was 4.0 mg/L,the removal rate could reach about 87.56%.After 4 times of regeneration,the recycling rate of composite material was about 84.90%,and the average removal rate could reach to 91.49%.