Notice of RetractionStudy on fouling resistance by nanosized TiO2 modified ultra-filtration membrane catalyzed ozonation

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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In this paper, nanosized TiO₂ modified ultra-filtration membrane catalyzed ozonation is studied. Firstly, the mechanism of TiO₂-catalyzed ozonation process is confirmed and it was also observed that catalytic ozonation were significantly influenced by tert-butyl alcohol, which testified that nanosized TiO₂ catalyzed ozonation of organics follows a radical-type mechanism. In comparison of ozonation and catalytic ozonation, it was presented that the process of TiO₂ catalyzed ozonation can provide hydroxyl radicals with higher concentration and the organic compound in the effluent of catalytic ozonation was 20% less than ozonation alone. Secondly, the effects of ozone does and reactive time on the treatment of ultra-filtration membrane flux and TOC are studied. The optimum reaction conditions were determined as following: ozone does of 1.34mg/L and reactive time of 5 minutes. Finally, the major function of ozone on membrane fouling resistance are also evaluated that TiO₂ catalyzed ozonation of colloid particles and small molecular organic substances were withheld or absorbed to the inner surface of the membrane pore. The results were showed that TOC removal ratio of TiO₂ catalyzed ozonation was about 90% after filtration 120 minutes, and the flux decline degree was reduced obviously that TiO₂ catalyzed ozonation had a relatively high membrane flux (81.4% of initial flux) which was 29.4% higher than ozonation (63.9% of initial flux) after fi- tration 180 minutes.