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过程工程学报 ›› 2016, Vol. 16 ›› Issue (1): 110-114.DOI: 10.12034/j.issn.1009-606X.215326

• 反应与分离 • 上一篇    下一篇

改性蜂窝煤残渣对刚果红的吸附

余美琼 杨金杯 林建钦   

  1. 福建省福州市福建师范大学福清分校 福建省福州市福建师范大学福清分校 福建省福州市福建师范大学福清分校
  • 收稿日期:2015-09-10 修回日期:2015-10-20 出版日期:2016-02-20 发布日期:2016-12-22
  • 通讯作者: 余美琼

Adsorption of Congo Red Dye by Modified Honeycomb Coal Burnt Cinder

YU Mei-qiong YANG Jin-bei LIN Jian-qin   

  1. Fuqing Branch, Fujian Normal University Fuqing Branch, Fujian Normal University Fuqing Branch, Fujian Normal University
  • Received:2015-09-10 Revised:2015-10-20 Online:2016-02-20 Published:2016-12-22
  • Contact: YU Mei-qiong

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摘要： 以改性蜂窝煤渣为吸附剂，用扫描电镜对改性前后蜂窝煤残渣的形貌进行了表征，研究了其吸附水中刚果红染料的动力学和热力学，分别用Langmuir, Freundlich和Tempkin吸附等温线模型进行拟合. 结果表明，改性蜂窝煤残渣对刚果红的吸附能力良好. Langmuir方程的拟合效果最好(RC2≥0.9979)，25, 35, 45℃下的饱和吸附量分别为80.64, 92.59和108.7 mg/g. 吸附过程符合拟二级动力学模型(RC2≥0.9961)，吸附活化能为22.87 kJ/mol，为物理吸附过程. 吸附为表面扩散和颗粒内扩散联合控制过程. 改性蜂窝煤渣对刚果红的吸附是自发的吸热过程.

关键词: 煤渣, 刚果红, 吸附, 动力学, 热力学

Abstract: The modified honeycomb coal burnt cinder was used to remove Congo Red (CR) dye from wastewater as an adsorbent. The scanning electron microscope was used to analyze the morphology of the cinder before and after modification. The adsorption thermodynamics and kinetics of CR on the modified honeycomb cinder were studied. The adsorption isothermal data fitted to the Langmuir, Freundlich, and Tempkin equations. The results show that the modified honeycomb cinder has a good adsorption capacity for CR, the adsorption process agrees well with the Langmuir model (RC2≥0.9979). The equilibrium adsorption capacity of CR is 80.64, 92.59 and 108.7 mg/g at 25, 35 and 45℃, respectively. The adsorption process can be described by a pseudo-second-order kinetic model (RC2≥0.9961), the activation energy is 22.87 kJ/mol and the adsorption process shows physical adsorption. The adsorption rate is controlled by both surface and intraparticle diffusions. The adsorption processes is spontaneous and endothermic.

Key words: cinder, Congo Red, adsorption, kinetics, thermodynamics

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