CuMn_2O_4/NiMn_2O_4近常温热催化降解亚甲基蓝研究

Preparation of Cu Mn_2O_4/ NiMn_2O_4 Catalysts for Thermocatalytic Degradation of Methylene Blue Near Room Temperature

采用高温固相合成法制备Cu Mn2O4/Ni Mn2O4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 CuMn2O4/NiMn2O4 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.