多元金属掺杂改性ZnO/ZSM-5紫外光降解罗丹明B印染废水研究
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摘要
运用溶胶-凝胶法将纳米ZnO负载于ZSM-5制光催化剂,用Ag、Fe、Cu掺杂改性ZnO/ZSM-5光催化性能并探究光催化剂ZnO/ZSM-5降解罗丹明B(RhB)模拟印染废水性能。以SEM和XRD分析手段对材料进行表征;探究溶液pH、底物初始浓度、光催化剂的用量及光强等因素对ZnO/ZSM-5降解RhB效果的影响。结果表明:ZnO/ZSM-5降解RhB印染废水最佳条件:ZnO/ZSM-5用量0.1 g·L~(-1)、初始浓度5 mg·L~(-1)、pH为7的RhB溶液、在紫外光源20 W的条件下降解RhB速率高达98.8%;Ag、Fe、Cu掺杂量分别:5%Ag-ZnO/ZSM-5、3%Fe-ZnO/ZSM-5、0.01%Cu-ZnO/ZSM-5时RhB的降解率分别高达97.52%、90.07%、87.12%;Ag、Fe、Cu共同掺杂的3%Fe-0.1%Cu-5%Ag-ZnO/ZSM-5催化效果优于单种金属元素掺杂改性材料。
Photocatalytic performance of ZnO/ZSM-5 doped with metal Ag,Fe and Cu by using sol-gel method to make photocatalyst through loading nano-ZnO on ZSM-5 and to explore the photocatalyst ZnO/ZSM-5 to degrade the simulative printing and dyeing wastewater performance of rhodamine B.The modified materials were characterized by SEM and XRDanalysis.The effects of the pH of a solution,substrate initial concentration,photocatalyst dosage the degradation of rhodamine B by ZnO/ZSM-5 were investigated.The effects of the optimum ratio of Ag,Fe and Cu on the performance of photocatalyst ZnO/ZSM-5 were investigated.The results showed that when the dosage of photocatalyst(ZnO/ZSM-5)is 0.1 g·L~(-1),the initial concentration of RhB is 5 mg·L~(-1),The initial solution pH was 7,The ultraviolet light source is 20 W,The degradation rate of RhB is as high as 98.8%;And this is the optimal test condition.The degradation rates to RhB by 5%Ag-ZnO/ZSM-5,3%Fe-ZnO/ZSM-5 and 0.01%Cu-ZnO/ZSM-5 were as high as 97.52%,90.07%and 87.12%.The catalytic effect of 3%Fe-0.1%Cu-5%Ag-ZnO/ZSM-5 co-doped by Ag,Fe and Cu is better than that of single metal element doping.
Photocatalytic performance of ZnO/ZSM-5 doped with metal Ag,Fe and Cu by using sol-gel method to make photocatalyst through loading nano-ZnO on ZSM-5 and to explore the photocatalyst ZnO/ZSM-5 to degrade the simulative printing and dyeing wastewater performance of rhodamine B.The modified materials were characterized by SEM and XRDanalysis.The effects of the pH of a solution,substrate initial concentration,photocatalyst dosage the degradation of rhodamine B by ZnO/ZSM-5 were investigated.The effects of the optimum ratio of Ag,Fe and Cu on the performance of photocatalyst ZnO/ZSM-5 were investigated.The results showed that when the dosage of photocatalyst(ZnO/ZSM-5)is 0.1 g·L~(-1),the initial concentration of RhB is 5 mg·L~(-1),The initial solution pH was 7,The ultraviolet light source is 20 W,The degradation rate of RhB is as high as 98.8%;And this is the optimal test condition.The degradation rates to RhB by 5%Ag-ZnO/ZSM-5,3%Fe-ZnO/ZSM-5 and 0.01%Cu-ZnO/ZSM-5 were as high as 97.52%,90.07%and 87.12%.The catalytic effect of 3%Fe-0.1%Cu-5%Ag-ZnO/ZSM-5 co-doped by Ag,Fe and Cu is better than that of single metal element doping.
引文
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[5]王侃,陈英旭,叶芬霞.SiO2负载的TiO2光催化剂可见光催化降解染料污染物[J].催化学报,2004,25(12):931-936.
[6]TiO2光催化剂可见光化研究进展[J].化学进展,2005,17(1):8-14.
[7]Xian Z,Qiao J,Li W,et al.Photocatalytic degradation of dyeing wastewater by Nano-TiO2 photocatalyst[J].Environmental Science&Technology,2009.
[8]Zhang H,Wang G,Chen D,et al.Tuning photoelectrochemical performances of Ag-TiO2 nanocomposites via reduction/oxidation of Ag[J].Chemistry of Materials,2008,20(20):6543-6549.
[9]Yang X,Xu L L,Yu X D,et al.One-step preparation of silver and indium oxide co-doped TiO2 photocatalyst for the degradation of rhodamine B[J].Catalysis Communications,2008,9(6):1224-1229.
[10]常勇刚.不同贵金属修饰的氧化锌复合物性能研究[D].上海:华东师范大学,2010.
[11]王学文,周力.分子筛负载硫化镉光催化降解罗丹明B的研究[J].应用化工,2012,41(12):2057-2059,2063.
[12]金伟,田彦文.氧化锌的制备及其光催化性能研究[J].材料与冶金学,2007,6(1):215-218.
[13]Zeng H B,Liu P S,Cai W P,et al.Controllable Pt/ZnO porous nanocages with improved photocatalytic activity[J].The Journal of Physical Chemistry C,2008,112(49):19620-19624.
[14]Zheng Y H,Chen C Q,Zhan Y Y,et a1.Photocatalytic activity of Ag/ZnO heterostructure nanocatalyst:correlation between structure and property[J].The Journal of Physical Chemistry C,2008,112(29):10773-10777.
[15]Zhu J F,Zheng W,He B,et al.Characterization of Fe-TiO2 photocatalysts synthesized by hydrothermal method and their photocatalytic reactivity for photodegradation of XRG dye diluted in water[J].Journal of Molecular catalysis A:Chemical,2004,216(1):35-43.
[16]Choi W,Termin A,Hoffmann M R.The role of metal iron dopants in quantnm-sized TiO2:correlation between photoreactivity and charge carrier recombination dynamics[J].The Journal of Physical Chemistry,1994,98(51):13669-13679.
[17]金龙,陈锋,何斌.光催化[M].上海:华东理工大学出版社,2004.孔冬梅.Fe3+掺杂提高二氧化钛的光催化活性[J].广州化工,2010,38(7):107-109.
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