期刊论文

Zeng, R.-Y.

中文

过程工程学报

1009-606X

2013

13

5

821-824

国家自然科学基金资助项目（编号:51078128）； 湖南省自然科学联合基金资助项目（编号:13jj9018）； 湖南省重点建设学科基金资助项目；

本校为第一且通讯机构

采用KH_2PO_4活化原材料芝麻秆,分别在300和600℃对活化后芝麻秆进行炭化,制得炭化芝麻秆吸附剂(CSS1和CSS2),通过静态吸附实验研究了其对苯酚的吸附性能,考察了pH值、吸附时间和温度对苯酚吸附的影响,分析了炭化芝麻秆对苯酚的吸附机理. 结果表明,CSS2吸附苯酚能力比CSS1强,其吸附较好地满足Langmuir和Freundlich等温方程,在20, 30和40℃下CSS2对苯酚的最大吸附容量分别高达13.53, 18.42和21.32 mg/g;动力学研究表明其吸附速率快,在150 min内能达到吸附平衡,准二级动力学模型较好地描述了该吸附行为,相关系数高达0.999;计算了热力学参数△G~θ, △H~θ和△S~θ的值,该吸附过程为自发过程.

Carbonized sesame stalks prepared from sesame stalks using monopotassium phosphate as an activator at 300 and 600°C were utilized as adsorbents (CSS1 and CSS2) to remove phenol from aqueous solution, and the effects of pH value, adsorption time, and temperature on the adsorption of phenol examined. The results showed that the CSS2 sample had greater adsorption efficiency than the CSS1. The Langmuir and Freundlich models were applied to describe the adsorption isotherms of the phenol on CSS. The Langmiur model fitted well the experimental data ...