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采用一步共沉淀方法制备纳米MnO_2/AC复合材料,并经FT-IR、滴定分析及扫描电镜SEM对其进行了表征,该复合催化剂由纳米MnO_2包覆活性炭组成,呈多层孔状,MnO_2球型度较高,呈球粒状多层堆砌,粒径为(22±5)nm,为高量子活性纳米颗粒,MnO_2的质量分数为28.6%。纳米MnO_2/AC材料复合了活性炭强物理吸附性和纳米MnO_2高化学催化活性,降解石油化工苯酚废水效果明显。同时,考察了废水pH、催化剂质量浓度和苯酚质量浓度对苯酚降解率和平衡吸附容量的影响,结果表明:由于物理吸附和化学催化过程的协同作用,在废水pH小于4,样品投入量大于2.0 g/L,苯酚质量浓度低于125 mg/L时,苯酚降解率均达90%以上,吸附容量为22.6~88.7 mg/g。处理后废水中苯酚质量浓度低于0.5 mg/L,达到污水排入城镇下水道水质标准。
Nanometer MnO 2 / AC composite was prepared by one-step coprecipitation method and characterized by FT-IR, titration and scanning electron microscopy (SEM). The composite catalyst was composed of nano-MnO 2 -coated activated carbon, High degree of spherical structure of multi-piled with particle size of (22 ± 5) nm, high quantum activity of nanoparticles, MnO 2 mass fraction of 28.6%. Nano-MnO 2 / AC composites have strong physical adsorption of activated carbon and high chemical catalytic activity of nano-MnO 2, and have obvious effect on degradation of phenol-based wastewater from petrochemical industry. At the same time, the effects of wastewater pH, catalyst concentration and phenol concentration on phenol degradation rate and equilibrium adsorption capacity were investigated. The results showed that when the wastewater pH was less than 4 and the sample input was more than 2.0 due to the synergistic effect of physical adsorption and chemical catalysis, g / L, the phenol degradation rate reached more than 90% when the phenol concentration was lower than 125 mg / L, and the adsorption capacity was 22.6 ~ 88.7 mg / g. After treatment, the concentration of phenol in waste water is less than 0.5 mg / L, reaching the water quality standard of sewage discharged into urban sewers.