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›› 2013, Vol. 13 ›› Issue (5): 821-824.

• 反应与分离 • 上一篇    下一篇

炭化芝麻秆对苯酚废水的吸附性能

唐文清 曾荣英 冯泳兰 张复兴   

  1. 衡阳师范学院化学与材料科学系 衡阳师范学院化学与材料科学系 衡阳师范学院化学与材料科学系 衡阳师范学院化学与材料科学系
  • 收稿日期:2013-05-20 修回日期:2013-06-17 出版日期:2013-10-20 发布日期:2013-10-20
  • 通讯作者: 唐文清

Adsorption Characteristics of Phenol on Carbonized Sesame Stalks

TANG Wen-qing ZENG Rong-ying FENG Yong-lan ZHANG Fu-xing   

  1. Department of Chemistry and Materials Science, Hengyang Normal University Department of Chemistry and Materials Science, Hengyang Normal University Department of Chemistry and Materials Science, Hengyang Normal University Department of Chemistry and Materials Science, Hengyang Normal University
  • Received:2013-05-20 Revised:2013-06-17 Online:2013-10-20 Published:2013-10-20
  • Contact: TANG Wen-qing

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摘要： 采用KH2PO4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DGq, DHq和DSq的值，该吸附过程为自发过程.

关键词: 炭化芝麻秆, 苯酚, 吸附等温方程, 动力学, 热力学

Abstract: Carbonized sesame stalks prepared from sesame stalks using monopotassium phosphate as an activator at 300 and 600℃ 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 with the maximum adsorption capacity of 13.53, 18.42, and 21.32 mg/g on CSS2 at 20, 30 and 40℃. Their kinetic behaviors showed that the adsorption was fast, the adsorption reached equilibrium within 150 min, and the adsorption process followed a pseudo-second-order kinetic model. The calculated values of thermodynamic parameters DGq, DHq and DSq indicated that the adsorption process was spontaneous.

Key words: carbonized sesame stalk, phenol, adsorption isotherm models, kinetics, thermodynamics

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