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›› 2010, Vol. 10 ›› Issue (5): 911-914.

• 反应与分离 • Previous Articles     Next Articles

Adsorption Characteristics of Cr3+ and Fe3+ by Activated Carbon from Stainless Steel Pickling Wastewater

ZENG Yuan ZHAO Jun-xue MA Hong-zhou LI Fei LI Xiao-ming   

  1. School of Metallurgical Engineering,Xi'an University of Architecture and Technology School of Metallurgical Engineering,Xi'an University of Architecture and Technology School of Metallurgical Engineering,Xi'an University of Architecture and Technology School of Metallurgical Engineering,Xi'an University of Architecture and Technology School of Metallurgical Engineering,Xi'an University of Architecture and Technology
  • Received:2010-09-07 Revised:2010-10-09 Online:2010-10-20 Published:2010-10-20
  • Contact: ZENG Yuan

活性炭对不锈钢酸洗废水中Cr3+和Fe3+的吸附特性

曾媛 赵俊学 马红周 李菲 李小明   

  1. 西安建筑科技大学冶金工程学院 西安建筑科技大学冶金工程学院 西安建筑科技大学冶金工程学院 西安建筑科技大学冶金工程学院 西安建筑科技大学冶金工程学院
  • 通讯作者: 曾媛

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Abstract: Adsorption of Cr3+ and Fe3+ by activated carbon from stainless steel pickling wastewater is studied. The results show that the adsorption capacity of Cr3+ is 4.546 mg/g while Fe3+ is 40.76 mg/g, with the equilibrium time of 90 and 60 min, respectively. The adsorption process fits to the pseudo-second-order equation better than pseudo-first-order equation. Adsorption of Cr3+ is correlated reasonably well to Langmuir and Freundlich isotherm curves but adsorption of Fe3+ is accordant to the BET isotherm curve. The calculated adsorption activation energy of Cr3+ is 37.19 kJ/mol while Fe3+ 51.01 kJ/mol. The results indicate that Cr3+ mainly chemically adsorbed on activated carbon while physical adsorption dominants the adsorption of Fe3+.

Key words: activated carbon, Cr3+, Fe3+, kinetic model, isotherm model

摘要： 对颗粒活性炭吸附不锈钢酸洗废水中的Cr3+和Fe3+进行了研究. 结果表明，活性炭对Cr3+的饱和吸附量为4.546 mg/g，对Fe3+的饱和吸附量为40.76 mg/g，吸附平衡时间分别为90和60 min. 对吸附过程进行准一级、准二级动力学模型拟合，发现准二级模型拟合较好. 活性炭对Cr3+的吸附基本符合Langmuir和Freundlich等温吸附模型，而对Fe3+的吸附与BET吸附模型拟合较好，吸附Cr3+, Fe3+的活化能Ea分别为37.19和51.01 kJ/mol. 活性炭对Cr3+的吸附以化学吸附为主，而物理吸附则主导对Fe3+的吸附.

关键词: 活性炭, Cr3+, Fe3+, 动力学模型, 等温吸附模型

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