蒙脱土对亚甲基蓝模拟染料废水吸附过程研究
The Adsorption Studies of Methylene Blue onto Montmorillonite

作者: 田素燕 * , 王小华 , 高金泉 , 吴德文 :青海省安全生产科学技术中心,西宁;

关键词: 蒙脱土亚甲基蓝吸附染料废水Montmorillonite Methylene Blue Adsorption Dye Wastewater

摘要: 基于研究蒙脱土对亚甲基蓝模拟废水的吸附过程,考察了pH值、吸附剂用量、亚甲基蓝初始浓度、吸附温度等因素对吸附过程的影响以及蒙脱土对亚甲基蓝的吸附模型、吸附动力学规律。实验结果表明,亚甲基蓝溶液的pH值为5.0时,蒙脱土对亚甲基蓝达到最大吸附;随着吸附剂用量的逐渐增加,蒙脱土对亚甲基蓝的平衡吸附量逐渐减小;蒙脱土对亚甲基蓝的平衡吸附量随着亚甲基蓝初始浓度的增加而增加,但随着吸附温度的增加而减小。Langmuir等温吸附模型、准二级动力学模型可以很好的描述蒙脱土对亚甲基蓝的吸附过程。实验结果可为蒙脱土应用于染料废水处理领域提供理论数据。

Abstract:

Montmorillonite was tested as an adsorbent for methylene blue (MB) removal from aqueous solution. The effect of various experimental parameters was investigated using a batch of adsorption techniques. In this manner, pH, amount of adsorbent, MB initial concentration, temperature which may affect MB adsorption on Montmorillonite were thoroughly examined. The absorption isotherm, adsorption kinetics were also researched. Results showed that a pH value of 5.0 was favorable for the adsorption of MB. Amount of MB adsorbed at equilibrium time (qe) decreased as the amount of adsorbent increased. The qe of the adsorbents increased gradually with the increment of MB initial concentration, but decreased gradually with adsorption temperature increasing. The isothermal data could be well described by Langmuir equation. The dynamical data fitted well with the pseudo-second-order kinetic model. The results laid the theoretical foundation for application of Montmorillonite which could be used as adsorbent in wastewater treatment.

文章引用: 田素燕 , 王小华 , 高金泉 , 吴德文 (2013) 蒙脱土对亚甲基蓝模拟染料废水吸附过程研究。 化学工程与技术, 3, 178-183. doi: 10.12677/HJCET.2013.35032

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