摘要
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25min、用量为1.8g/L时,对苯系混合物质量浓度为4.0mg/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%。
The orthogonal experiment was designed to optimize the adsorption of benzene mixture （benzene, tol- uene, 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 ob- tained composite material presented perfect adsorption capacity, which was only inferior to activated carbon. The per- formance 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 re- moval rate could reach about 87.56%. After 4 times of regeneration, the recycling rate of composite material was a- bout 84.90%, and the average removal rate could reach to 91.49%.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2012年第3期45-48,共4页
Environmental Pollution & Control
基金
天津市应用基础及前沿技术重点项目(No.10JCZDJC24100)
关键词
苯
甲苯
二甲苯
苯系混合物
顶空气相色谱法
benzene
toluene
xylene
benzene mixture
headspaee gas chromatography
