MgFe型层状双氢氧化物(MgFe-LDH)催化降解亚甲基蓝性能研究
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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%.
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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[2]白青青,吴小宁,王倩,等.基于过碳酸钠的类Fenton体系对亚甲基蓝的降解动力学[J].环境工程学报,2018,12(1):110-118.
[3]Meng Q N,Du L L,Yang J,et al. Well-dispersed small-sized MnOxnanoparticles and porous carbon composites for effective methylene blue degradation[J]. Colloids and Surfaces A,2018,548:142-149.
[4]Xue L Y,Gao B,Wan Y S,et al. High efficiency and selectivity of modified wheat-straw biochar in the removal of nitrate from aqueous solutions[J]. Journal of the Taiwan Institute of Chemical Engineers,2016,63:312-317.
[5]Gao Y,Wang F F,Wu Y,et al. Comparison of degradation mechanisms of microcystin-LR using nanoscale zero-valent iron(n ZVI)and bimetallic Fe/Ni and Fe/Pd nanoparticles[J]. Chemical Engineering Journal,2016,285:459-466.
[6]Han C,Machala L,Medrik I,et al. Degradation of the cyanotoxin microcystin-LR using iron-based photocatalysts under visible light illumination[J]. Environ Sci Pollut Res,2017,24(23):19435-19443.
[7]张曼林.水滑石一碳量子点复合物的吸附及催化性能研究[D].北京:北京化工大学,2015.
[8]Willems N,Yang H Y,Langelaan M L P,et al. Biocompatibility and intradiscal application of a thermoreversible celecoxibloadedd poly-N-isopropylacrylamide MgFe-layred double hydroxide hydrogel in a canine model[J]. Arthritis Research&Therapy,2015,17(1):214-229.
[9]杜以波,何静,李峰,等.水滑石及柱撑水滑石的制备和表征[J].北京化工大学学报,1997,24(3):76-80,88.
[10]向莹.磁性复合材料的制备及其在有机染料污水处理中的应用[D].武汉:湖北大学,2014.
[11]Zhi S,Lu M S,Curry D E.,et al. Regenerative nanobots based on magnetic layered double hydroxide for azo dye removal and degradation[J]. Journal Name,2017,52(1):1-4.
[12]Zhang Y,Zhang W T,Chen K,et al. Highly sensitive and selective colorimetric detection of glutathione via enhanced Fenton-like reaction of magnetic metal organic framework[J]. Sensors and Actuators B:Chemical,2018,262:95-101.