CuMn2 O4／NiMn2 O4近常温热催化降解亚甲基蓝研究

摘要

采用高温固相合成法制备CuMn2 O4／NiMn2 O4热敏催化剂，通过XRD、TEM、TGA、UV-vis和SEM等手段对样品进行了表征，研究了近常温热催化降解亚甲基蓝有机污染物。结果表明：亚甲基蓝底物质量浓度分别为30、40和50 mg／L时，随着温度从30、35到40℃的升高，去除率分别达到68.35％、79.64％和88.89％；在完全遮光、40℃、亚甲基蓝底物质量浓度为30 mg／L和热敏催化剂用量45 mg的条件下，经过48 h热催化降解过程，最佳降解率达到最优。此外，利用GC-MS对降解产物进行了分析，发现降解的主要产物为二氯甲烷和甲苯，由此证明亚甲基蓝确实发生了降解反应，且其降解程度也比较彻底。综上所述，近常温热催化降解途径将为未来工业废水处理提供潜在解决方案。%A CuMn2 O4/NiMn2 O4 heat-sensitive catalyst was prepared by a high temperature solid phase method.The product was characterized by X-ray diffraction (XRD),transmission electron microscope (TEM),thermogravimetric analysis (TGA),UV-Vis spectroscopy (UV-vis),and scanning electron mi-croscopy (SEM).The thermocatalytic degradation behavior for methylene blue (MB)was investigated at near room temperature.The results showed that,when the system temperature was increased from 30, 35,to 40 ℃ at the initial concentrations of 30,40,and 50 mg/L,their corresponding removal rates reached 68.35%,79.64%and 88.89%,respectively.The optimal degradation rate was achieved in the conditions of the treatment time of 48 h,the initial concentration of MB at 30 mg/L,the dosage of 45 mg for thermal catalyst,and at 40 ℃in dark.Besides,the degradation products were analyzed by gas chro-matography-mass spectrometer (GC-MS).The result indicated that the main products were dichlorometh-ane and toluene,confirming the true occurrences of the degradation for MB.In conclusion,the thermo-catalytic degradation route under near room temperature may provide a potential method in the treatment for waste water in industry.