Mechanism insight of pollutant degradation and bromate inhibition by Fe-Cu-MCM-41 catalyzed ozonation

被引：56
作者：
Chen, Weirui [1 ,2 ,3 ]
Li, Xukai [1 ,2 ,3 ]
Tang, Yiming [1 ]
Zhou, Jialu [1 ,2 ,3 ]
Wu, Dan [1 ,2 ,3 ]
Wu, Yin [1 ,2 ,3 ]
Li, Laisheng [1 ,2 ,3 ]
机构：
[1] South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China
[2] Guangdong Prov Engn Technol Res Ctr Drinking Wate, Guangzhou 510006, Guangdong, Peoples R China
[3] Guangdong Prov Key Lab Funct Mat Environm Protect, Guangzhou 510006, Guangdong, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2018年 / 346卷
关键词：
Catalytic ozonation; Diclofenac; Mineralization; Bromate; Lewis sites; BROMIDE-CONTAINING WATER; SURFACE HYDROXYL-GROUPS; DRINKING-WATER; ALPHA-FEOOH; DICLOFENAC; MINERALIZATION; OXIDATION; IRON; PH; PRODUCTS;
D O I：
10.1016/j.jhazmat.2017.12.036
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A flexible catalyst, Fe-Cu-MCM-41, was employed to enhance diclofenac (DCF) mineralization and inhibit bromate formation in catalytic ozonation process. Greater TOC removal was achieved in Fe-Cu-MCM-41/O-3 process (78%) than those in Fe-MCM-41/O-3 (65%), Cu-MCM-41/O-3 (73%) and sole ozonation (42%). But it was interesting that both Cu-MCM-41/O-3 and Fe-MCM-41/O-3 achieved 93% bromate inhibition efficiency, only 71% inhibition efficiency was observed in Fe-Cu-MCM-41/O-3. Influence of pH, TBA/NaHSO3 and detection of by-products were conducted to explore the mechanism. By Pyridine adsorption-IR and XPS, a relationship was found among activity of catalysts, Lewis acid sites and electron transfer effect between Fe (II/III) and Cu (I/II). Fe-Cu-MCM-41 promoted ozone decomposition to generate (OH)-O-center dot, which accounted for enhanced DCF mineralization. The consumption of aqueous O-3 also suppressed the oxidative of Br- and HBrO/Br-. More HBrO/BrO- accumulated in catalytic ozonation process and less bromate generated. Bromate formation in Fe-Cu-MCM-41/O-3 process was sensitive with pH value, the acidic condition was not favor for bromate formation. Both DCF mineralization and bromate inhibition were influenced by surface reaction. Moreover, Fe-Cu-MCM-41 showed excellent catalytic performance in suppressing the accumulation of carboxylic acid, especially for oxalic acid. Nearly no oxalic acid was detected during Fe-Cu-MCM-41/O-3 process. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：226 / 233
页数：8
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