Abstract
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 (B0.3ETS‐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 B0.3ETS‐4, indicating good reusability, and stability of B0.3ETS‐4 in catalytic ozonation. B0.3ETS‐4 catalyzed ozonation followed a molecular ozone oxidation mechanism rather than •OH mediated oxidation. B0.3ETS‐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.
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