不锈钢/TiO_2复合膜光催化降解活性染料的研究

Photocatalyzed degradation of reactive dye by using stainless steel/TiO_2 composite membranes

以金属/Ti O2复合膜为光催化剂,活性艳蓝为模拟染料废水,研究了光照时间、溶液初始浓度、p H、H2O2用量和无机盐对染料光降解率的影响。结果表明,金属/Ti O2复合膜具有较好的光催化活性和超亲水性。活性艳蓝的光降解率随染料初始浓度和p H的升高而降低,在实验条件下5 h内的光降解率可达到85%以上,且能重复利用。催化剂H2O2的加入促进光降解的进行,且存在一个最佳值,最佳H2O2浓度为0.02 mol/L,低于或超过该值均会导致染料光降解率的下降。而无机盐的加入则抑制了光降解反应的进行,且Na2SO4的抑制作用明显强于Na Cl和Na NO3。

Abstract： By using metal-TiO2 composite membrane as photocatalyst and reactive brilliant blue as simulated wastewater, the effects of irradiation time, initial dye concentration, pH, hydrogen peroxide dosage and inorganic salts on degradation degree are studied. The results show that the metal-TiO2 composite membrane has good hydrophilic property and excellent photo-catalytic degradation ability. The degradation degree of the reactive brilliant blue is decreased with the increase in the dye concentrations and pH. And the degradation degree can reach above 85% in 5 hours and be repeatedly used under the experimental conditions. H2 O2 can improve the degradation of the dye. The optimum amount of H2O2 is 0. 02 moL/L. However, the addition of inorganic salts inhibits the photodegradation process. And the inhibition effect of the inorganic salts is dependent on their concentration and ranked as follows：Na2SO4 〉 NaNO3 〉 NaCl.