壳聚糖改性凹凸棒处理废水中苯酚的实验研究  

Adsorption of Phenol in Wastewater by Attapulgite Modified with Chitosan

作　　者：冷宝林[1] 夏德强[1] 吕维华[1] 甘黎明[1] 张远欣[1] 

机构地区：[1]兰州石化职业技术学院石油化学工程系,甘肃兰州730060

出　　处：《非金属矿》2015年第1期79-81,共3页Non-Metallic Mines

基　　金：甘肃省高等学校研究生导师科研项目(1216-03);甘肃省高校基本科研业务费专项资金资助项目(甘财教[2012]129号)

摘　　要：研究了壳聚糖改性凹凸棒(CTS-ATP)对废水中苯酚的吸附效果,探索了该工艺的最佳条件。结果表明,当反应温度为40℃,CTSATP吸附剂的投加量为10 g/L,p H值为6时,吸附30 min后苯酚的去除率达90%以上。CTS-ATP对废水中苯酚的吸附符合Langmuir吸附等温方程。根据热力学函数关系计算出苯酚在CTS-ATP上的吸附焓变ΔH为95.13 J/mol,自由能变ΔG小于0,熵变ΔS大于0,表明CTS-ATP对苯酚的吸附是一自发的熵增吸热过程。Removal of phenol in wastewater by attapulgite modified with chitosan was examined. The optimum technological condition of this process was determined. The removal rate of phenol in wastewater reaches above 90.0% when pH value is 6.0, temperature is 40℃, attapulgite modiifed with chitosan dosage is 10.0 g/L and adsorption time is 30 min. The adsorption data of phenol onto attapulgite modiifed with chitosan iftted well to the Langmuir isotherm. The adsorption enthalpy changes, Gibbs free energy changes and entropy changes were calculated according to the relationship of the thermodynamic function. The results indicate that the adsorption of phenol onto attapulgite modiifed with chitosan is an endothermic （enthalpy ΔH=95.13 J/mol） and spontaneous （free energy ΔG〈0） process, with an increase in entropy （ΔS〉0）.

关 键 词：凹凸棒 壳聚糖 苯酚 废水 吸附 热力学 

分 类 号：X703.1[环境科学与工程—环境工程]