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Investigation on Titanium Silicalite ETS‐4 Catalyzed Ozonation for Chemicals in Wastewater, Exemplified With 4‐Chlorophenol
Author(s) -
Chen Chunmao,
Han Chao,
Wang Ping,
Guo Shaohui,
Yan Guangxu,
Li Qing X.
Publication year - 2016
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201500282
Subject(s) - catalysis , chemistry , ozone , adsorption , chemical oxygen demand , wastewater , titanium , nuclear chemistry , organic chemistry , waste management , engineering
The parent titanium silicalite ETS‐4 (pETS‐4) and alkali‐modified ETS‐4 (BETS‐4) catalysts were utilized for catalytic ozonation of chemicals in wastewater as exemplified with 4‐chlorophenol (4‐CP). NaOH treatment resulted in more TiO and TiOTi structure exposures and Ti surface enrichment on ETS‐4. The ozonation catalyzed by BETS‐4 catalysts showed better catalytic performance compared with pETS‐4 and single ozonation, which is probably due to increased Ti distribution on the surface of the catalysts. NaOH (0.3 mol/L) modified ETS‐4 (B 0.3 ETS‐4) offered the highest chemical oxygen demand (COD) removal rate (89.2%) in catalyzed ozonation of 4‐CP solution. A negligible change of COD removal rate, surface morphology, and elemental composition were observed for five repeated cycles of B 0.3 ETS‐4, indicating good reusability, and stability of B 0.3 ETS‐4 in catalytic ozonation. B 0.3 ETS‐4 catalyzed ozonation followed a molecular ozone oxidation mechanism rather than • OH mediated oxidation. B 0.3 ETS‐4 provided a platform to adsorb and activate 4‐CP and/or ozone molecules to accelerate reactions between them. This study demonstrated that ETS‐4 is a potentially efficient catalyst for ozonation of recalcitrant organic contaminants in wastewater.