摘要
研究了坡缕石-活性炭-壳聚糖负载环糊精吸附剂对对硝基苯酚、邻硝基苯酚的吸附行为以及pH、温度等对吸附的影响。在pH=5.0-7.5时,自制吸附剂对对硝基苯酚,邻硝基苯酚具有较好的吸附作用。等温吸附曲线拟合结果显示,吸附剂对硝基苯酚的吸附更符合Langmu ir方程。热力学函数计算表明,吸附剂对硝基酚的吸附是自发的放热过程,对硝基苯酚的吸附热和熵变分别为-27.49 kJ/mol和-70.39 J/(mol.K),邻硝基苯酚的吸附热和熵变分别为-29.06 kJ/mol和-78.87 J/(mol.K),吸附自由能均随温度的升高而增加。
The adsorption behavior of p-nitrophenol and o-nitrophenol on the adsorbent of palygorskite/ active carbon/chitosan supported cyclodextrin was studied. Effects of acidity and temperature were examined. The adsorbent has a good adsorption capacity at pH of 5.0 - 7.5. Thermodynamic study shows that the adsorption process can be well simulated by the Langmuir isothermal equation. Thermodynamic function calculation shows that the adsorption is a spontaneous and exothermic process. Enthalpy and entropy change of the adsorption of p-nitrophenol are - 27.49 kJ/mol and - 70. 39 J/ （ mol- K）, respectively. Enthalpy and entropy change of the adsorption of o-nitrophenol are - 29.06 kJ/mol and -78.87 J/（mol·K）, respectively. Free energy of the adsorption increases with the increase of temperature.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2007年第3期209-212,共4页
Fine Chemicals
关键词
坡缕石
壳聚糖负载环糊精
硝基酚
吸附
等温吸附方程
吸附热力学
palygorskite
chitosan supported cyclodextrin
nitrophenol
adsorption
isothermal equation
thermodynamic function
