粉煤灰负载壳聚糖对磷吸附的热力学研究  

Adsorption and Thermodynamics of phosphorus-containing Wastewater by Fly Ash-chitosan Adsorbent

作　　者：李玲[1] 单爱琴[1] 蔡静[1] 

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《污染防治技术》2011年第2期35-38,共4页Pollution Control Technology

摘　　要：以粉煤灰负载壳聚糖作为吸附剂,在静态吸附条件下,研究了其对磷的吸附行为,并对吸附过程的热力学进行了分析。结果表明,吸附平衡数据都能够较好地符合Langmuir和Freundlich吸附等温方程,但Langmuir方程能够更好地描述吸附等温线。在20～35℃范围内,磷在粉煤灰负载壳聚糖上的吸附是一个吸热过程,反应的吉布斯自由能变小,同时伴随着熵值的增加,吸附焓变为44.36 kJ/mol。A kind of adsorbent is made by coating chitosan on the surface of fly ash and adsorptions of three direct dyes in aqueous solutions on the salt sludge adsorbent were studied under static conditions.The thermodynamic of the adsorptions were also analyzed.Equilibrium data fitted well with Langmuir and Freundlich model in the range of 2～20 mg/L.The Langmuir isotherm model appeared to fit the isotherm data better than the Freundlich isotherm model.The adsorption of the fly ash-chitosan was endothermic in nature and was accompanied with an increase in entropy and a decrease in gibbs energy in the range of 20～35℃,the numerical values of sorption gibbs energy is 44.36 kJ/mol.

关 键 词：粉煤灰 壳聚糖 吸附 热力学 

分 类 号：X132[环境科学与工程—环境科学]