纳米MnO_2/活性炭复合材料的制备及催化降解苯酚性能研究  

Synthesis of nano-MnO_2/activated carbon composite materials and their catalytic degradation performance against phenol

作　　者：陈金庆 王业胜 吕宏凌[1] 赵瑞玉[1] 杨向平[1] CHEN Jin-qing WANG Ye-sheng LV Hong-ling ZHAO Rui-yu YANG Xiang-ping(College of Chemical Engineering, China University of Petroleum, Qingdao 266580, Chin)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《现代化工》2017年第8期150-153,共4页Modern Chemical Industry

摘　　要：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。Nano manganese dioxide/activated carbon composite materials are prepared through single step coprecipitation method by using KMnO4,Na2S2O3,and activated carbon as materials,and then are characterized by FT-IR,back titration analysis and scanning electron microscopy.The composite materials are of a multilayer porous structure on the base of activated carbon fully coated by Nano-MnO2.The nano manganese dioxide present high quantum activity with spherical nanoparticles.Their particle size and mass content in composite materials are 22 nm ± 5 nm and 28. 6 wt%,respectively.The composite nano catalysts combine strong physical adsorption ability of activated carbons with high chemical catalytic activity of Nano-MnO2,and are efficiently applied to degrade phenol in petrochemical wastewater.The effects of pH value,catalyst dosage and initial phenol concentrations on the degradation efficiency of phenol and equilibrium adsorption capacity are investigated. The results indicate that due to the synergistic effect of physical adsorption and chemical catalytic process,the degradation efficiency of phenol can exceed 90% and the adsorption capacity is 22. 6-88. 7 mg·g^-1when the composite catalyst is used to treat with wastewater of pH value less than 4. 0,and catalyst dosage is more than 2. 0 g·L^-1and phenol initial concentrations is below 125 mg·L^-1. The phenol concentration in treated wastewater is less than 0. 5 mg·L^-1,which reaches wastewater quality standards for discharging to municipal sewers.

关 键 词：纳米MNO2 活性炭 一步共沉淀 苯酚废水 化学催化 

分 类 号：X703.1[环境科学与工程—环境工程] X705