赤泥基非均相催化剂类Fenton催化降解金橙Ⅱ  

Catalytic Degradation of Orange Ⅱ in Fenton-like Process Catalyzed by Red Mud-based Heterogeneous Catalyst

作　　者：邵鲁华[1] 魏光涛[1] 李仲民[1] 张琳叶[1] 刘子涵[1] 张强[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《非金属矿》2016年第5期23-26,共4页Non-Metallic Mines

基　　金：国家自然科学基金(21366003);广西自然科学基金(2015GXNSFCA139017;2015GXNSFBA139031)

摘　　要：采用糖蜜酒精废液协同H_2SO_4对赤泥进行酸化改性,再经高温焙烧处理,得到赤泥基非均相催化剂(SMA-CA/赤泥),通过XRD、EDS、N2吸附脱附技术对SMA-CA/赤泥进行了表征,并将其用于金橙Ⅱ的类Fenton催化降解。表征结果显示:经酸化和焙烧,赤泥中的α-FeOOH转变为SMA-CA/赤泥中的α-Fe_2O_3,且酸化改性使得SMA-CA/赤泥碱含量显著降低;与未添加糖蜜酒精废液酸化改性的赤泥基非均相催化剂相比,SMA-CA/赤泥的孔径增大,大孔分布提高。实验结果表明:在初始溶液p H值为3、H_2O_2投加量50 mmol/L、金橙Ⅱ质量浓度40 mg/L、反应时间6 h的条件下,金橙Ⅱ去除率达到86.79%;该催化降解过程符合一级动力学模型。Red mud was firstly acidified by H2SO4 and molasses alcohol wastewater, and then calcined to obtain a red mud-based heterogeneous catalyst, i.e. SMA-CA/red mud. The SMA-CA/red mud was characterized by XRD, EDS and N2 adsorption-desorption, and then was used for degradation of orange Ⅱ in Fenton-like process. The characterization results showed that after the acidification and calcination, α-FeOOH in red mud was changed into α-Fe2O3 of SMA-CA/red mud, and the alkaline compounds in SMA-CA/red mud were effectively reduced. Compared with that of red mud-based heterogeneous catalyst which was acidified without molasses alcohol wastewater, the pore diameter and the macropore distribution of SMA-CA/red mud all increased. The experimental results showed that the removal rate of orange Ⅱ reached 86.79% under the conditions of initial concentration of orange Ⅱ40 mg/L, initial concentration of H2O2 50 mmol/L, solution pH value 3, reaction time 6 h. The degradation reaction accorded with the first-order kinetics model.

关 键 词：赤泥 糖蜜酒精废液 酸化 焙烧 类FENTON 金橙Ⅱ 

分 类 号：X703.1[环境科学与工程—环境工程]