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利用锯末制备的活性炭去除废水中的染料:吸附平衡和动力学

Dye removal from wastewater using activated carbon developed from sawdust: adsorption equilibrium and kinetics.

作者信息

Malik P K

机构信息

Department of Chemistry, Centre for Surface Science, Jadavpur University, Kolkata 32, India.

出版信息

J Hazard Mater. 2004 Sep 10;113(1-3):81-8. doi: 10.1016/j.jhazmat.2004.05.022.

Abstract

Mahogany sawdust was used to develop an effective carbon adsorbent. This adsorbent was employed for the removal of direct dyes from spent textile dyeing wastewater. The experimental data were analysed by the Langmuir and Freundlich models of adsorption. Equilibrium data fitted well with the Langmuir model. The rates of adsorption were found to conform to the pseudo-second-order kinetics with good correlation. The equilibrium adsorption capacity of the sawdust carbon was determined with the Langmuir equation as well as the pseudo-second-order rate equation and found to be >300 mg dye per gram of the adsorbent. The most ideal pH for adsorption of direct dyes onto sawdust carbon was found to be 3 and below. The results indicate that the Mahogany sawdust carbon could be employed as a low cost alternative to commercial activated carbon in the removal of dyes from wastewater.

摘要

桃花心木锯末被用于制备一种有效的碳吸附剂。这种吸附剂用于去除纺织印染废水中的直接染料。实验数据通过Langmuir和Freundlich吸附模型进行分析。平衡数据与Langmuir模型拟合良好。吸附速率符合伪二级动力学,相关性良好。用Langmuir方程以及伪二级速率方程确定了锯末碳的平衡吸附容量,发现每克吸附剂对染料的平衡吸附容量大于300毫克。发现直接染料吸附到锯末碳上的最理想pH值为3及以下。结果表明,桃花心木锯末碳可作为一种低成本替代品,用于替代商业活性炭从废水中去除染料。

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