Fe-Mn负载凹凸棒催化剂的制备及协同臭氧化处理甲基橙模拟废水的应用  

Preparation of Fe-Mn Palygorskite Catalysts and their Cooperation with Ozonation in Simulated Methyl Orange Wastewater Treatment

作　　者：吕杭杰 贾建洪[2] 金赞芳 陆敏英 陈伊豪 李非里 

机构地区：[1]浙江工业大学环境学院,浙江杭州310014 [2]浙江工业大学化学工程学院,浙江杭州310014

出　　处：《高校化学工程学报》2017年第5期1217-1224,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(41273129;41373122)

摘　　要：天然凹凸棒土(PG)较传统活性炭及其他稀土等载体价格低廉,在环保领域极具开发潜力。今以PG作为催化剂载体的原料,经提纯后,其比表面积、孔容和孔径分别比天然PG增加了74.1%、204%和74.3%;再以2 mol×L^(-1)硝酸溶液改性,分别再增加了24.5%、23.4%和11.1%。采用凝胶法负载Fe^(3+)、Mn^(2+)双活性组分后得到催化剂,协同臭氧,用于甲基橙模拟废水处理,色度去除率达99.96%,化学需氧量(COD)去除率达92.47%。动力学实验表明改性Fe-Mn负载PG协同臭氧对甲基橙模拟废水的降解符合一级动力学反应模型,自由基掩蔽实验表明该氧化过程遵循自由基氧化机理。Fe-Mn负载PG联合臭氧氧化技术能有效去除印染废水的色度和COD。Raw palygorskite（PG） resources are abundant in China with lower price than traditional catalyst carriers（such as activated carbon and rare-earth-containing carriers）. Raw PG was selected as a catalyst carrier in this study. The specific surface area, pore volume and pore diameter of PG are increased by 74.1%, 204%, and 74.3% respectively after purification, which further increase by 24.5%, 23.4%, and 11.1% respectively after acid modification. The treated PG was loaded with Fe^（3＋） and Mn^（2＋） with a sol-gel method and was used with ozonation to treat simulated methyl orange wastewater. The removal of color and chemical oxygen demand（COD） of the wastewater are 99.96% and 92.47%, respectively. Kinetic results show the degradation of simulated methyl orange wastewater is of first-order kinetics model, and the reaction mechanism follows the radical oxidation mechanism. The Fe-Mn loaded PG catalyst combined with ozonation can be used for color and COD removal of dye wastewater.

关 键 词：凹凸棒 甲基橙 协同氧化 催化剂 

分 类 号：X703.1[环境科学与工程—环境工程] TE624.95[石油与天然气工程—油气加工工程]