Photodegradation of methyl tert-butyl ether (MTBE) by UV/H2O2 and UV/TiO2
Photodegradation of methyl tert-butyl ether (MTBE) by UV/H2O2 and UV/TiO2
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DOI：
10.1016/j.jhazmat.2007.10.118
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发表时间：
2008-06-15
影响因子：
13.6
通讯作者：
Zhu, Miaojun
中科院分区：
文献类型：
--
作者：
Hu, Qinhai;Zhang, Chunlong;Zhu, Miaojun
在间歇式反应器系统中考察了UV/H2 O2和UV/TiO 2两种基于UV的高级氧化工艺（AOPs）对甲基叔丁基醚（MTBE）的去除效果和最佳工艺条件。在UV/H_2O_2体系中，当MTBE初始浓度为1 mM（[MTBE]（0）= 1 mM）时，最佳反应条件为酸性和15 mM H_2O_2;在UV/TiO_2悬浮体系中，在254 nm紫外光照射下，pH为3.0，TiO_2浓度为2.0g/l。在最佳条件下，MTBE在UV/H2 O2和UV/TiO 2体系中的初始光降解率分别达到98%和80%。在两种体系中，随着[MTBE]（0）的增加，MTBE的光降解降低。虽然MTBE光降解速率随着H2 O2（5-15 mM）和TiO 2（0.5-3 g/l）剂量的增加而增加，但是进一步增加H2 O2（20 mM）或TiO 2（4 g/l）的剂量不利地降低了MTBE的光降解。两种体系中[MTBE]的光降解均符合准一级动力学方程。在UV/H_2O_2体系中，随[H_2O_2]（0）/[MTBE]（0）摩尔比的增加，反应的准一级速率常数线性增加;在UV/TiO_2体系中，随[MTBE]（0）摩尔比的减小，反应的准一级速率常数线性增加。(C)2007 Elsevier B. V.保留所有权利。
Two UV-based advanced oxidation processes (AOPs), UV/H2O2 and UV/TiO2, were tested in batch reactor systems to evaluate the removal efficiencies and optimal conditions for the photodegradation of methyl tert-butyl ether (MTBE). The optimal conditions at an initial MTBE concentration of 1 mM ([MTBE](0) = 1 mM) were acidic and 15 mM H2O2 in UV/H2O2 system, and pH 3.0 and 2.0 g/l TiO2 in UV/TiO2 suspended slurries system under 254-mn UV irradiation. Under the optimal conditions, MTBE photodegradation during the initial period of 60 min in UV/H2O2 and UV/TiO2 systems reached 98 and 80%, respectively. In both systems, MTBE photodegradation decreased with increasing [MTBE](0). While MTBE photodegradation rates increased with increasing dosage of H2O2 (5-15 mM) and TiO2 (0.5-3 g/l), further increase in the dosage of H2O2 (20 mM) or TiO2 (4 g/l) adversely reduced the MTBE photodegradation. Pseudo first-order kinetics with regard to [MTBE] can be used to describe the MTBE photodegradation in both systems. The pseudo first-order rate constants linearly increased with the increase in the molar ratio of [H2O2](0) to [MTBE](0) in UV/H2O2 system and linearly increased with the decrease in [MTBE](0) in UV/TiO2 system. (C) 2007 Elsevier B.V. All rights reserved.