Removal of the hazardous dye rhodamine B through photocatalytic and adsorption treatments
Removal of the hazardous dye rhodamine B through photocatalytic and adsorption treatments
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DOI：
10.1016/j.jenvman.2006.11.002
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发表时间：
2007-12-01
影响因子：
8.7
通讯作者：
Mittal, Alok
中科院分区：
文献类型：
--
作者：
Jain, Rajeev;Mathur, Megha;Mittal, Alok
本文报道了光催化和吸附处理废水中有害的杂蒽染料罗丹明B。在催化剂TiO2存在下进行光催化降解，观察pH、染料浓度、TiO2用量、温度和电子受体H2O2对降解过程的影响。结果表明，TiO2光催化降解罗丹明B是一种高效、经济、快速的脱除方法。还尝试利用活性炭和稻壳作为潜在的吸附剂去除废水中的罗丹明B。分别在40、50、60℃条件下进行吸附实验，考察了pH、温度、吸附剂用量、吸附质浓度等因素对吸附性能的影响。根据吸附数据，确定了Langmuir和Freundlich吸附等温线模型。利用所得的吸附等温线常数计算吉布自由能、焓变和熵变等热力学参数。为观察废水的水质，还对处理前后的COD进行了测定。观察到COD值显著降低，这清楚地表明光催化和吸附方法都具有良好的去除工业废水中罗丹明B的潜力。(C) 2006 Elsevier Ltd版权所有。
This paper reports on photocatalytic and adsorptive treatment of a hazardous xanthene dye, Rohdamine B, in wastewater. The photocatalytic degradation was carried out in the presence of the catalyst TiO2 and the effects of pH, concentration of the dye, amount of TiO2, temperature and electron acceptor H2O2 on the degradation process were observed. It was found that photocatalytic degradation by TiO2 is an effective, economical and faster mode of removing Rohdamine B from aqueous solutions. Attempts were also made to utilize activated carbon and rice husk as potential adsorbents to remove Rhodamine B from wastewater. The adsorption studies were carried out at 40, 50 and 60 degrees C. and the effects of pH, temperature, amount of adsorbents, concentration of adsorbate, etc., on the adsorption were measured. On the basis of adsorption data the Langmuir and Freundlich adsorption isotherm models were also confirmed. The adsorption isotherm constants thus obtained were employed to calculate thermodynamic parameters like Gibb's free eneray, change in enthalpy and entropy. In order to observe the quality of wastewater COD measurements were also carried out before and after the treatments. A significant decrease in the COD values was observed, which clearly indicates that both photocatalytic and adsorption methods offer good potential to remove Rhodamine B from industrial effluents. (C) 2006 Elsevier Ltd. All rights reserved.