Ag/ZnO复合中空材料的制备及光催化降解罗丹明B
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摘要
以脱脂棉纤维为模板,二水醋酸锌和硝酸银为原料,利用模板法制备了Ag/ZnO复合材料,通过SEM、FT-IR、XRD技术对样品形貌和结构进行了分析。在紫外灯照射下,以罗丹明B染料溶液为目标降解物,探究了浸泡时间和Ag掺杂量对Ag/ZnO复合材料催化性能的影响。实验结果表明,复合材料保持了模板物的纤维形貌,呈中空结构;浸泡时间和Ag掺杂量对Ag/ZnO复合材料的催化性能影响显著。模板物浸泡2h后于700℃煅烧2h制备的Ag掺杂为1.0%(mol,摩尔百分含量)的Ag/ZnO复合材料对100mL 10mg/L罗丹明B的降解率高达99%,且具有良好的重复使性能。
Using defatted cotton fiber as the template,zinc acetate and silver nitrate as raw materials,Ag doped ZnO composites were prepared by template method.SEM,FT-IR,and XRD techniques were employed to characterize the morphology and structure of composites.The influence of dipping time and silver doped amount on photocatalytic performance were studied by using Rhodamine B solution as the model reaction under UV light irradiation.The experimental results showed that the composites had hollow fiber structure.The above effects had a significant impact on the catalytic performance.The catalytic activity was the best when Ag/ZnO was obtained under dipping 2 h,calcined 2h at 700℃ with Ag amount of 1.0%,the degradation of 100 mL Rhodamine B solution was 99%,and the composites exhibited excellent reusability.
Using defatted cotton fiber as the template,zinc acetate and silver nitrate as raw materials,Ag doped ZnO composites were prepared by template method.SEM,FT-IR,and XRD techniques were employed to characterize the morphology and structure of composites.The influence of dipping time and silver doped amount on photocatalytic performance were studied by using Rhodamine B solution as the model reaction under UV light irradiation.The experimental results showed that the composites had hollow fiber structure.The above effects had a significant impact on the catalytic performance.The catalytic activity was the best when Ag/ZnO was obtained under dipping 2 h,calcined 2h at 700℃ with Ag amount of 1.0%,the degradation of 100 mL Rhodamine B solution was 99%,and the composites exhibited excellent reusability.
引文
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[2]Ohtani B.Preparing articles on photocatalysis-beyond the illusions,misconceptions,and speculation[J].Chem Lett,2008,37(3):216-229.
[3]Marion L,Reinhard N.Photocatalytic atrazine degradation by synthetic minerals,atmospheric aerosols,and soil particles[J].Environ Sci Technol,2002,36(24):5342-5347.
[4]Georgekutty R,Seery M K,Pillai S C.A highly efficient AgZnO photocatalyst:synthesis,properties,and mechanism[J].J Phys Chem C,2008,112(35):13563-13570.
[5]欧阳林莉,肖奇,王志坚,等.有机污水处理方法研究进展[J].湖南有色金属,2010,26(4):34-37.
[6]刘艳,夏宁,陈日耀,等.静电纺丝法制备ZnO纳米纤维及其光催化性能的研究[J].福建师范大学学报(自然科学版),2008,24(1):66-69.
[7]Yu C L,Fan C F,Yu J M.Preparation of bismuth oxyiodides and oxides and their photooxidation characteristic under visible/UV light irradiation[J].Mater Res Bull,2011,46(1):140-146.
[8]Kinuyo K,Manabu K,Yoshiyuki Y,et al.Photoreduction of Ag ion on ZnO single crystal[J].Applied Surface Seience,2002,189(3/4):265-270.
[9]Parida K M,Dash S S,Das D P.Physico-chemical characterization and photocatalytic activity of zinc oxide prepared by various methods[J].J Coll Inter Sci,2006,298(2):787-793.
[10]Stroyuk A L,Shvalagin V V,Kuchmii S Ya.Photochemical synthesis,spectral-optical and electrophysical properties of composite nanoparticles of ZnO/Ag[J].Theoretical and Experimental Chemistry,2004,40(2):98-104.
[11]Ma C M,Ku Y,Kuo Y L,et al.Effects of silver on the photocatalytic degradation of gaseous isopropanol[J].Water Air Soil Pollut,2009,197(1-4):313-321.
[12]Zheng T,Tian Z,Su B T,et al.Facile method to prepare TiO2hollow fiber materials via replication of cotton fiber[J].Ind Eng Chem Res,2012,51(3):1391-1395.
[13]田泽,郑焘,许晶晶,等.SnO2/ZnO复合中空纤维材料的制备及其光催化性能[J].化学试剂,2012,34(5):444-448.
[14]Bae E Y,Choi W Y.Highly enhanced photoreductive degradation of perchlorinated compounds on dye-sensitized metal/TiO2under visible light[J].Environ Sci Technol,2003,37(1):147-152.
[15]Yu J G,Xiong J F,Cheng B,et al.Fabrication and characterization of Ag-TiO2 multiphase nanocomposite thin films with enhanced photocatalytic activity[J].Appl Catal B:Environ,2005,60(3/4):211-221.
[16]任学昌,史载锋,孔令仁.TiO2薄膜的Ag改性及光催化活性[J].催化学报,2006,27(9):815-822.