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The gangue filter media was modified by the titanium dioxide (TiO2) through   the liquid phase deposition method. Some influence factors of photocatalytic   activity were investigated, including the mole ratio of initial solution, the   water bath temperature, the deposition time, the calcination temperature, and   the heat preservation time of calcination. The morphology of the film was   examined by SEM, EDS, and crystallite structure by X-Ray Diffraction (XRD).   The SEM, EDS, and XRD data showed that new TiO2 crystal was found in the   modified filter media. And the specific surface area of the modified filter   media greatly increased. By the orthogonal experiment, the optimum parameters   of modification were (NH4)2TiF6:H3BO3=1:2, water bath temperature of 80ºC,   deposition time of 5h, calcination temperature of 500ºC, and 1h heat   preservation time of calcination. Under above conditions, the heavy nitrogen   wastewater of 1589.94 mg/L COD and 18750 times chroma was treated by the   modified filter media. After 1h catalytic reaction, the decolorization rate   and COD removal rate reached 65.89% and 47.87%, respectively

Influence factors of photocatalytic activity of the filter media modified by TiO2