4.7 Article

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

期刊

JOURNAL OF HAZARDOUS MATERIALS
卷 346, 期 -, 页码 226-233

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.12.036

关键词

Catalytic ozonation; Diclofenac; Mineralization; Bromate; Lewis sites

资金

  1. Science & Technology Office of Guangzhou [201607010276]
  2. Nation High-Tech Research and Development Program [2013AA06A305]

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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.

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