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以浮石为载体、TiO2粉末浸渍法制备TiO2/浮石催化剂,光催化处理邻苯二甲酸二甲酯(DMP)微污染水,对催化剂的催化效率、耐用性进行考察,并探讨水体pH、HCO3-、Cl-、SO42-和腐殖酸对降解效率的影响。结果表明,当DMP初始质量浓度20 mg.L-1,催化剂投加量10 g.L-1,光降解100 min DMP降解率达94.5%,催化剂重复使用二次后DMP降解率仍在80%以上;当溶液pH为3.0时降解率下降至76.5%,表明酸性体系不利于DMP的光催化降解;3种阴离子对降解反应都有抑制作用,抑制强度为HCO3->Cl->SO42-;腐殖酸对该降解反应抑制作用明显,抑制作用随浓度增大而增强。TiO2/浮石催化剂在曝气条件下形成流化状态,使TiO2充分接触水样和吸收光源而具备较高催化效率,另外涂膜稳定牢固,可反复使用。
Porous TiO2 as support, TiO2 powder impregnation method to prepare TiO2 / pumice catalyst, photocatalytic treatment of dimethyl phthalate (DMP) slightly polluted water, the catalytic efficiency and durability of the catalyst were investigated, and discuss the water pH, HCO3- , Cl-, SO42- and humic acid on the degradation efficiency. The results showed that when the initial concentration of DMP was 20 mg.L-1, the dosage of catalyst was 10 gL-1, the degradation rate of DMP was 94.5% after 100 min of photodegradation, and the degradation rate of DMP was still above 80% after the catalyst was used twice. When the solution pH was 3.0, the degradation rate decreased to 76.5%, indicating that the acid system is not conducive to the photocatalytic degradation of DMP; three kinds of anions have an inhibitory effect on the degradation reaction, the inhibition strength of HCO3-> Cl-> SO42-; humic acid Inhibition of the degradation reaction was obvious inhibition increased with increasing concentration. TiO2 / pumice catalyst under aerated conditions to form a fluidized state, so that TiO2 fully contact with water samples and absorb light source with high catalytic efficiency, while the other stable and stable coating can be used repeatedly.