Cu-SiO_2催化降解蒽醌类染料的研究

Study on Cu-SiO_2 Catalytic Degradation of Anthraquinone Dyes

蒽醌类染料作为第二大类染料被广泛应用,染料废水具有排水量大、色度深、难于降解、性质较稳定和成分复杂等特点,一直是处理过程中的难点和重点。本研究采用溶胶-凝胶法(sol-gel)制备Cu-SiO2催化材料,并以茜素红为蒽醌类染料废水的模拟降解对象,探讨了蒽醌类染料的微波催化降解过程中催化剂掺Cu量、催化剂用量、H2O2用量及溶液初始温度对茜素红降解效果的影响。结果表明在SiO2材料掺杂Cu可以提高催化材料的活性,掺杂比越高促进茜素红的降解效果越好;Cu-SiO2催化剂用量对降解效果影响明显,但达到一定用量后,即可达到较好的降解效果;增加H2O2用量可以提高氢氧自由基(·OH)浓度,促进对茜素红溶液的降解;溶液初始温度变化对降解效果具有明显影响,超过70℃以上可以保证催化降解顺利进行。茜素红溶液的Cu-SiO2微波催化降解的最佳条件为Cu与SiO2摩尔掺杂比为1/64、催化剂用量0.06 g/mL、H2O2用量4μL/mL、溶液初始温度70℃。

Anthraquinones dye, as the second kind of dye, is widely used. But treatment of the dye wastewater is difficult because of its large displacement, deep chromaticity, refractory and stable properties, complex component. In this paper, Cu-SiO2 catalytic material was papered by sol-gel method; then alizarin red was used as a simulation degradation object of anthraquinone dyes wastewater, the influence of various factors on the degradation of alizarin red by the microwave catalytic degradation process was investigated, such as amount of Cu-doped, amount of catalyst, amount of 30% H202, and starting temperature. The results show that doping Cu into SiO2 material can enhance the activity of the catalytic material, and the higher the doping ratio, the better the degradation effect of alizarin red; Cu-SiO2 catalyst dosage has obvious impact on the degradation, but the catalyst reaches a certain amount, it can achieve good degradation effect; Increasing the amount of H202 can improve the concentration of hydroxyl radicals （-OH） and promote degradation of alizarin red solution. Initial temperature change has significant effect on the degradation effect of aqueous solution, temperature above 70 ~C can guarantee the smooth progress of the catalytic degradation; The best conditions for Cu-SiO2 microwave catalytic degradation of alizarin red solution are as follows： Cu and SiO2 doping mol ratio 1/64, amount of catalyst 0.06g/ml, H202 dosage 4μl/ml, initial temperature 70 ℃.