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采用共沉淀法合成新型催化剂S2O28-/CaO.Fe2O3粉体。用红外光谱对其结构进行表征,并考察了助催化剂H2O2的用量、催化剂的投加量以及不同光源对罗丹明B溶液催化降解的影响。实验结果表明,所研制的S2O28-/CaO.Fe2O3粉体为固体超强酸,粒径处于纳米数量级,且其在紫外光区556 nm处有个紫外特征峰。在浸渍液(NH4)2S2O8浓度为0.5 mol/L、S2O28-/CaO.Fe2O3投加量为0.03g/25 mL、H2O2用量为1.00 mL/25 mL下,对浓度为0.6 g/L的罗丹明B溶液在自然光下静置1 h,其降解率可达99.2%。同时还初步探讨了催化降解过程中物理现象与化学性质分析、酸中心的形成机理及催化剂失活的可能原因。
Synthesis of a new catalyst S2O28- / CaO.Fe2O3 powder by coprecipitation method. Its structure was characterized by infrared spectroscopy. The effects of the amount of cocatalyst H2O2, the dosage of catalyst and the catalytic degradation of rhodamine B solution by different light sources were investigated. The experimental results show that the S2O28- / CaO.Fe2O3 powder is a solid superacid whose particle size is on the order of nanometers and has a UV characteristic peak at 556 nm in the ultraviolet region. Under the conditions of 0.5 mol / L 2S2O8, 0.03 g / 25 mL S2O28- / CaO.Fe2O3 and 1.00 mL / 25 mL H2O2, the concentration of rhodamine B solution in natural light to stand 1 h, the degradation rate of up to 99.2%. At the same time, the preliminary analysis of the physical and chemical properties of the catalytic degradation process, the formation mechanism of the acid sites and possible reasons for catalyst deactivation were also discussed.