摘要
利用共沉淀法制备4种不同比例的MgFe型层状双氢氧化物(MgFe-LDH),通过X线粉末衍射仪(XRD)、透射电镜(TEM)等方法对催化剂的结构和性质进行表征.以亚甲基蓝(mehtylene blue,MB)为模型污染物,考察MgFe-LDH中Mg与Fe的比例、MB的初始浓度、pH值、过氧化氢(H_2O_2)浓度、MgFe-LDH的用量、催化反应中物质的加入顺序等条件对MB降解效果的影响.结果表明:对于8 mg/L的MB溶液,选择Mg与Fe的比例为2∶1的MgFe-LDH,当加入量为10mg,30%H2O2溶液的加入量为80μL,并且溶液的p H=5时,降解率达到91. 08%.
Four different ratios of Mg Fe-type layered double hydroxide( MgFe-LDH) were prepared by coprecipitation method. The structure and properties of the catalyst were characterized by X-ray powder diffractometry( XRD) and transmission electron microscopy( TEM). Using mehtylene blue( MB) as a model pollutant,the ratio of Mg to Fe in MgFe-LDH, the initial concentration of MB, the pH value, the concentration of hydrogen peroxide( H2 O2),the amount of MgFe-LDH,the substance in the catalytic reaction and the order of addition were investigated. The results showed that for the 8 mg/L MB solution,Mg Fe-LDH with a ratio of Mg to Fe of 2∶ 1 was selected. When it was added in an amount of 10 mg,the amount of 30%H2 O2 solution was 80 μL,and the solution was at pH = 5,the degradation rate is up to 91. 08%.
引文
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