银负载纳米氧化锌光催化降解水中培氟沙星
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摘要
采用共沉淀法和光还原法制备银负载纳米氧化锌光催化剂(Ag/ZnO),运用X射线衍射和UV-Vis方法对Ag/ZnO催化剂进行分析、表征,结果显示:负载Ag的ZnO催化剂除了有纤锌矿相ZnO的衍射峰外,还出现单质Ag的衍射峰;Ag负载可增强ZnO在可见区域的吸收。实验结果表明:当银负载量为0.5mol%时,培氟沙星溶液浓度为15 mg/L,银负载纳米氧化锌催化剂用量为0.4 g/L时,光催化性能最好,紫外灯照射下反应5 h,降解率高达78.4%。
Nanocrystalline Ag-loaded ZnO powders(Ag/ZnO) were synthesized directly by homogeneous precipitation method and light reduction method,which were characterized by various sophisticated techniques such as XRD and UV-vis DRS.The characterized results indicated that Ag-loaded ZnO samples had a small amount of Ag diffraction peak besides wurtzite phase diffraction peaks of the ZnO.The Ag-loaded on ZnO can increase the visible light absorption.The experimental results showed that the 0.5mol% Ag-loaded ZnO was the most active with high photocatalytic activity for the degradation of pefloxacin,when the pefloxacin solution with 15 mg/L of the initial concentration and 0.4 g/L dosage of Ag/ZnO nanocomposite was degraded under degradation UV irradiation for 5 h,the efficiency reached to 78.4%.
Nanocrystalline Ag-loaded ZnO powders(Ag/ZnO) were synthesized directly by homogeneous precipitation method and light reduction method,which were characterized by various sophisticated techniques such as XRD and UV-vis DRS.The characterized results indicated that Ag-loaded ZnO samples had a small amount of Ag diffraction peak besides wurtzite phase diffraction peaks of the ZnO.The Ag-loaded on ZnO can increase the visible light absorption.The experimental results showed that the 0.5mol% Ag-loaded ZnO was the most active with high photocatalytic activity for the degradation of pefloxacin,when the pefloxacin solution with 15 mg/L of the initial concentration and 0.4 g/L dosage of Ag/ZnO nanocomposite was degraded under degradation UV irradiation for 5 h,the efficiency reached to 78.4%.
引文
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[3]Wu X L,Xiang L,Yan Q Y,et al.Distribution and risk assessment of quinolone antibiotics in the soils from organic vegetable farms of a subtropical city,Southern China[J].Science of the Total Environment,2014,487(1):399-406.
[4]Amorim C L,Maia A S,Mesquita R B R,et al.Performance of aerobic granular sludge in a sequencing batch bioreactor exposed to ofloxacin,norfloxacin and ciprofloxacin[J].Water Research,2014,50(3):101-113.
[5]Ge L,Chen JW,Wei XX,et al.Aquatic photochemistry of fluoroquinolone antibiotics:kinetics,pathways,and multivariate effects of main water constituents[J].Environmental Science and Technology,2010,44(7):2400-2405.
[6]Sturini M,Speltini A,Maraschi F,et al.Photochemical degradation of marbofloxacin and enrofloxacin in natural waters[J].Environmental Science and Technology,2010,44(12):4564-4569.
[7]Kusari S,Prabhakaran D,Lamshft M,et al.In vitro residual antibacterial activity of difloxacin,sarafloxacin and their photoproducts after photolysis in water[J].Environmental Pollution,2009,157(10):2722-2730.
[8]Wang ZP,Guo YZ,Liu ZZ,et al.Catechin as a new improving agent for a photo-Fenton-like system at near-neutral p H for the removal of Inderal[J].Photochemical&Photobiological Sciences,2015,14(2):473-480.
[9]Filipe O M S,Sónia A O S,M Rosário M D,et al.Photodegradation of the fungicide thiram in aqueous solutions-kinetic studies and identification of the photodegradation products by HPLC-MS/MS[J].Chemosphere,2013,91(7):993-1001.
[10]邹彩琼,贾漫珂,曹婷婷,等.纳米Zn O的制备、改性及光催化研究进展[J].内蒙古师范大学学报(自然科学汉文版),2011,40(5):500-507.
[11]夏卓英,王振红,陈丽凤,等.银掺杂氧化锌沸石复合物的制备和抗菌性能[J].硅酸盐学报,2014,33(5):1076-1081.
[12]耿树东.银掺杂对纳米氧化锌的光催化性能影响[J].科技向导,2014(35):242.
[13]Zhou JB,Cheng Y,Yu JG.Preparation and characterization of visiblelight-driven plasmonic photo catalyst Ag/Ag Cl/Ti O2nanocomposite thin films[J].Photochemistry and Photobiology A-Chemistry,2011,223(2):82-87.
[14]Hosseini-Sarvari M,Ataee-Kachouei T,Moeini F.A novel and active catalyst Ag/Zn O for oxidant-free dehydrogenation of alcohols[J].Materials Research Bulletin.2015,72:98-105.
[15]Kuai L,Geng B Y,Chen X T,et al.Facile subsequently lightinduced route to highly efficient and stable sunlight-driven Ag-Ag Br plasmonic photocatalyst[J].Langmuir,2010,26(24):18723-18727.
[16]Tang J,Zhou B,Zhang SL,et al.Synthesis and photocatalytic properties of lotus-rootlike Au-Zn O nanostructures[J].Science China(Chemistry),2015,58(5):1-5.
[17]Qu YQ,Cheng R,Su Q,et al.Plasmonic enhancements of photocatalytic activity of Pt/n-Si/Ag photodiodes using Au/Ag core/shell nanorods[J].Am.Chem.Soc.,2011,133(42):16730-16733.
[18]Di M A,Zimbone M,Scuderi M,et al.Effect of Pt nanoparticles on the photocatalytic activity of Zn O nanofibers[J].Nanoscale Research Letters,2015,10:1-7.
[19]Whang T J,Huang H Y,Hsieh M T,et al.Laser-induced silver nanoparticles on titanium oxide for photocatalytic degradation of methylene blue[J].Int J Mol Sci.,2009,10(11):4707-4718.