Photocatalytic degradation of a mixture of Crystal Violet (Basic Violet 3) and Methyl Red dye in aqueous suspensions using Ag+ doped TiO2
Photocatalytic degradation of a mixture of Crystal Violet (Basic Violet 3) and Methyl Red dye in aqueous suspensions using Ag+ doped TiO2
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DOI：
10.1016/j.dyepig.2005.04.001
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发表时间：
2006-01-01
影响因子：
4.5
通讯作者：
Sahoo, C
中科院分区：
文献类型：
--
作者：
Gupta, AK;Pal, A;Sahoo, C
研究了两种染料混合物的光催化降解：结晶紫（CV），也称为C. I.在紫外光照射下，研究了未处理的TiO 2和银离子掺杂的TiO 2对阳离子型三苯甲烷染料碱性紫3和阴离子型偶氮染料甲基红（MR）的光催化性能。为了提高TiO 2的光催化效率，并使其在降解后更容易从处理后的废水中分离出来，采用液相浸渍法对TiO 2进行了银离子掺杂。混合物中染料的降解在它们各自的值下用比色法测量。降解动力学gamma（max）很好地符合Langrnuir-Hinselwood伪一级速率定律。研究了pH值、Cl-、NO3-、SO 42-、HPO 42-、Ca-2+、Ca-Fe-2+、腐殖酸、O-2和电子受体H_2O_2、（NH_4）_2S_2O_8、KBrO_3等干扰物质对降解的影响。通过以1：1、1：5和1：10的V/V比混合CV（5 × 10（-5）mol dm（-3））和MR（7.5 × 10（-5）mol dm（-3））制备的这些染料的几种混合物在Ag+掺杂的TiO 2存在下在UV照射90分钟时降解> 99%，在TiO 2存在下在类似条件下降解约70%。定期测量COD去除率以量化染料的矿化。使用90分钟照射观察到86%以上的矿化。(c)2005爱思唯尔有限公司保留所有权利。
The photocatalytic degradation of a mixture of two dyes: Crystal Violet (CV), also known as C.I. Basic Violet 3, which is a cationic triphenylmethane dye and Methyl Red (MR), which is an anionic azo dye was studied using untreated TiO2 and silver ion doped TiO2, under UV irradiation. To increase the photocatalytic efficiency of TiO2 and to make its separation from the treated effluent after degradation easier, it was doped with silver ion using liquid impregnation method. The degradation of the dyes in the mixture was measured spectrophotometrically at their respective values. The degradation kinetic gamma(max) fitted well to the Langrnuir-Hinselwood pseudo first order rate law. The effects of pH and different interfering substances like Cl-, NO3-, SO42-, HPO42-, Ca-2+,Ca- Fe2+, humic acid, O-2 and electron acceptors like H2O2, (NH4)(2)S2O8 and KBrO3 on the degradation were also investigated. Several mixtures of these dyes prepared by mixing CV (5 X 10(-5) mol dm(-3)) and MR (7.5 X 10(-5) mol dm(-3)) in the V/V ratios of 1:1, 1:5 and 1:10 degraded by > 99% on UV irradiation for 90 min in the presence of Ag+ doped TiO2 and about 70% under similar conditions in presence of TiO2. COD removal was measured at regular intervals to quantify the mineralization of the dye. Above 86% mineralization was observed using 90 min irradiation. (c) 2005 Elsevier Ltd. All rights reserved.