稀土Ce掺杂ZnO微纳米材料的制备及应用研究
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摘要
随着现代化工业的发展,许多有毒或者无法直接进行生物降解的有机污染物产生,其对环境及人类健康造成严重的问题,因此,开发高效、经济、简单、快速的有机染料污染处理方法,一直深受各界关注。半导体光催化剂具有独特的性能,是处理有机污染物的有效材料之一。目前,半导体光催化材料普遍存在催化效率低、响应范围窄、回收再利用困难等问题。因此,以宽禁带光催化剂ZnO为研究主体,对其进行稀土元素Ce掺杂,旨在提升ZnO的催化性能,为开发高效光催化剂奠定基础。最终确定最佳掺杂量为2%,最佳pH为8,氙灯输出电流为21 A,催化剂用量以15 mg为宜,具有较好的稳定性,重复利用4次后,其催化活性基本不变。综上所述,该微纳米催化剂具有工业应用的前景。
With the development of modern industry,lots of organic pollutants that are toxic or cannot be directly bio-degraded cause the serious problems to environment and human health.Therefore,the development of efficient,economical,simple and rapid organic dye pollution treatment methods has been well payed attention.Photocatalysts have unique properties and are one of the effective materials for handling organic pollutants.At present,photocatalytic materials generally have problems of low catalytic efficiency,narrow light-response range,and difficulty in recycling. Therefore,in this work,the wide band gap photocatalyst ZnO is used as the research subject,and the element Ce doping is carried out to improve the catalytic performance of ZnO.Finally,the optimum Ce doping amount is 2%,the optimum pH is 8,the xenon lamp output current is 21 A,the catalyst dosage is 15 mg,and the cycle can be reused 4 times,which has the prospect of industrial application.
With the development of modern industry,lots of organic pollutants that are toxic or cannot be directly bio-degraded cause the serious problems to environment and human health.Therefore,the development of efficient,economical,simple and rapid organic dye pollution treatment methods has been well payed attention.Photocatalysts have unique properties and are one of the effective materials for handling organic pollutants.At present,photocatalytic materials generally have problems of low catalytic efficiency,narrow light-response range,and difficulty in recycling. Therefore,in this work,the wide band gap photocatalyst ZnO is used as the research subject,and the element Ce doping is carried out to improve the catalytic performance of ZnO.Finally,the optimum Ce doping amount is 2%,the optimum pH is 8,the xenon lamp output current is 21 A,the catalyst dosage is 15 mg,and the cycle can be reused 4 times,which has the prospect of industrial application.
引文
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[3]LEE D K,SONG B K,JEONG S E. et al. Phosgene-freephotocatalytic degradation of TCE and PCE vapors withAu/Ti O2[J].Top.Cata.,2010,53(7/10):560-565.
[4]田泽,郑焘,许晶晶,等.SnO2/Zn O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.
[5]FUJISHIMA A,HONDA K.Electrochemical photolysis ofwater at a semiconductor electrode[J]. Nature,1972,238(7):37-38.
[6]马荣华,高皓月,李晓宇.β2-Si W11Ti/PANI/Zn O复合材料的制备及光催化性能[J].化学试剂,2016,38(6):496-500.
[7]ZHANG K L,LIU C M,HUANG F Q,et al.Study of theelectronic structure and photocatalytic activity of theBi OCl photocatalyst[J]. Appl. Catal. B-Environ.,2006,68(3):125-129.
[8]YU C L,YANG K,YU J,et al.Effects of rare earth Ce do-ping on the structure and photocatalytic performance ofZn O[J].Acta Phys.Chim.Sin.,2011,27(2):505-512.
[9]唐兴兴.不同形貌Zn O与Zn O/Zn Fe2O4的制备及性能研究[D].武汉:武汉工程大学,2017.
[10]林倩茹.稀土元素(La、Ce、Nd)掺杂Zn O薄膜的光学和气敏性能[D].哈尔滨:哈尔滨工业大学,2012.
[11]JIA T K,WANG W M,LONG F,et al.Fabrication,char-acterization and photocatalytic activity of La-doped Zn Onanowires[J].J.Alloy.Compd.,2009,484(1):410-415.
[12]LU Y C,LIN Y H,WANG D J,et al.A high performancecobalt-doped Zn O visible light photocatalyst and its pho-togenerated charge transfer properties[J]. Nano Res.,2011,4(11):1 144-1 152.
[13]KARUNAKARAN C,GOMATHISANKAR P,MANI-KANDAN G.Preparation and characterization of antimi-crobial Ce-doped Zn O nanoparticles for photocatalyticdetoxification of cyanide[J]. Mater. Chem. Phys.,2010,123(2/3):585-594.
[14]KOSITZI M,POULIOS I,SAMARA K,et al.Photocata-lytic oxidation of Cibacron Yellow LS-R[J]. J. Hazard.Mater.,2007,146(3):680-685.
[15]HAQUE M M,MUNEER M,BAHNEMANN D W.Semi-conductor-mediated photocatalyzed degradation of a her-bicide derivative,chlorotoluron,in aqueous suspensions[J].Environ.Sci.Technol.,2006,40(15):4 765-4 770.
[16]CHONG M N,JIN B,CHOW C W K,et al.Recent de-velopments in photocatalytic water treatment technology:a review[J].Water Res.,2010,44(10):2 997-3 027.
[17]HERRMANN J M.Heterogeneous photocatalysis:funda-mentals and applications to the removal of various typesof aqueous pollutants[J]. Catal. Today,1999,53(1):115-129.