Abstract:A series of composite photocatalysts were prepared by using graphene oxide (GO) and TiO2 hydrogel. The composite photocatalyst was characterized through SEM, XRD and Raman spectroscopy, the decolorization effect of pure TiO2 and composite photocatalyst on methylene blue (MB) dye wastewater under different experimental conditions was studied. The results show that TiO2 in composite photocatalyst is mainly anatase phase and its photocatalytic activity is better than pure TiO2. When the addition of GO reaches 15%(mass fraction), the photocatalytic activity is the highest. When 250mg composite photocatalyst is added to 30mL synthetic wastewater with a concentration of 10mg/L and an initial pH value of about 8, the decolorization rate can reach 93.1% after 2.5 hours, and the composite photocatalyst has visible photocatalytic activity. It is presumed that the photogenerated charges of GO/TiO2 composite photocatalyst may directly destroy the luminescent groups in the MB molecule,and no other new luminescent groups are generated during the treatment.
[1] ANSARI S A,KHAN M M,ANSARI M O,et al.Silver nanoparticles and defect-induced visible light photocatalytic and photoelectrochemical performance of Ag@m-TiO2 nanocomposite[J].Solar Energy Materials and Solar Cells,2015,141:162-170.
[2] DOZZI M V,SELLI E.Doping TiO2 with p-block elements:effects on photocatalytic activity[J].Journal of Photochemistry and Photobiology:C,2013,14:13-28.
[3] SCHNEIDER J,MATSUOKA M,TAKEUCHI M,et al.Understanding TiO2 photocatalysis:mechanisms and materials[J].Chemical Reviews,2014,114(19):9919-9986.
[4] IVANOV S,BARYLYAK A,BESAHA K,et al.Synthesis,characterization,and photocatalytic properties of sulfur- and carbon-codoped TiO2 nanoparticles[J].Nanoscale Res Lett,2016,11(1):140-151.
[5] TRUPPI A,PETRONELLA F,PLACIDO T,et al.Visible-light-active TiO2-based hybrid nanocatalysts for environmental applications[J].Catalysts,2017,7(4):100-132.
[6] 赵慧敏,苏芳,范新飞,等.石墨烯-二氧化钛复合催化剂对光催化性能的提高[J].催化学报,2012,33(5):777-782. ZHAO H M,SU F,FAN X F,et al.Graphene-TiO2 composite photocatalyst with enhanced photocatalytic performance[J].Chinese Journal of Catalysis,2012,33(5):777-782.
[7] BALANDIN A A.Thermal properties of graphene and nanostructured carbon materials[J].Nat Mater,2011,8(10):569-581.
[8] NOVOSELOV K S,FALKO V I,COLOMBO L,et al.A roadmap for graphene[J].Nature,2012,490(7419):192-200.
[9] SENGUPTA R,BHATTACHARYA M,BANDYOPADHYAY S.et al.A review on the mechanical and electrical properties of graphite and modified graphite reinforced polymer composites[J].Progress in Polymer Science,2011,36(5):638-670.
[10] YANG J,DENG S Y,LEI J P,et al.Electrochemical synthesis of reduced graphene sheet-AuPd alloy nanoparticle composites for enzymatic biosensing[J].Biosensors & Bioelectronics,2011,29(1):156-166.
[11] BAI L,YUAN R,CHAI Y,et al.Simultaneous electrochemical detection of multiple analytes based on dual signal amplification of single-walled carbon nanotubes and multi-labeled graphene sheets[J].Biomaterials,2012,33(4):1090-1096.
[12] HASS J,De HEER W A,CONRAD E H,et al.The growth and morphology of epitaxial multilayer graphene[J].Journal of Physics:Condensed Matter,2008,20(32):323202.
[13] YOO E,KIM J,HOSONO E,et al.Large reversible Li storage of graphene nanosheet families for use in rechargeable lithium ion batteries[J].Nano Lett,2008,8(8):2277-2282.
[14] RYZHII V,RYZHII M,SATOU A,et al.Device model for graphene bilayer field-effect transistor[J].Journal of Applied Physics,2009,105(10):104510.
[15] SU X L,FU L,CHENG M Y,et al.3D nitrogen-doped graphene aerogel nanomesh:facile synthesis and electrochemical properties as the electrode materials for supercapacitors[J].Applied Surface Science,2017,426:924-932.
[16] GU Z G,YANG S P,LI Z J,et al.An ultrasensitive hydrogen peroxide biosensor based on electrocatalytic synergy of graphene-gold nanocomposite,CdTe-CdS core-shell quantum dots and gold nanoparticles[J].Anal Chim Acta,2011,701(1):75-80.
[17] 董慧民,牟维琦,史海燕,等.石墨烯填充丁腈橡胶纳米复合材料研究进展[J].航空材料学报,2018,38(5):36-46. DONG H M,MU W Q,SHI H Y,et al.Research progress of acrylonitrile-butadiene rubber nanocomposites filled with graphene[J].Journal of Aeronautical Materials,2018,38(5):36-46.
[18] 刘红娟,谢水波,张希晨,等.氧化石墨烯复合材料吸附铀的研究进展[J].材料工程,2018,46(5):11-21. LIU H J,XIE S B,ZHANG X C,et al.Research progress of graphene oxide composite materials for uranium adsorption[J].Journal of Materials Engineering,2018,46(5):11-21.
[19] ZHANG L,ZHANG Q H,XIE H Y,et al.Electrospun titania nanofibers segregated by graphene oxide for improved visible light photocatalysis[J].Applied Catalysis:B,2017,201:470-478.
[20] LIU N,LIANG G,DONG X W,et al.Stabilized magnetic enzyme aggregates on graphene oxide for high performance phenol and bisphenol A removal[J].Chemical Engineering Journal,2016,306:1026-1034.
[21] BHARAD P A,SIVARANJANI K,GOPINATH C S,et al.A rational approach towards enhancing solar water splitting:a case study of Au-RGO/N-RGO-TiO2[J].Nanoscale,2015,7(25):11203-11215.
[22] NOURI E,MOHAMMADI M R,LIANOS P,et al.Impact of preparation method of TiO2-RGO nanocomposite photoanodes on the performance of dye-sensitized solar cells[J].Electrochimica Acta,2016,219:38-48.
[23] HUMMERS W S Jr,OFFEMAN R E.Preparation of graphitic oxide[J].Journal of the American Chemical Society,1958,80(6):1339.
[24] FAN Y,LU H T,LIU J H,et al.Hydrothermal preparation and electrochemical sensing properties of TiO2-graphene nanocomposite[J].Colloids Surf B Biointerfaces,2011,83(1):78-82.
[25] 马利静,郭烈锦.不同原料合成的TiO2的变温拉曼光谱分析[J].化学学报,2006,64(9):863-867. MA L J,GUO L J.Study on the thermo-Raman spectrum of TiO2 prepared with different precursors[J].Acta Chimica Sinica,2006,64(9):863-867.
[26] LIANG D Y,CUI C,HU H H,et al.One-step hydrothermal synthesis of anatase TiO2/reduced graphene oxide nanocomposites with enhanced photocatalytic activity[J].Journal of Alloys and Compounds,2014,582:236-240.
[27] KANSAL S,SINGH M,SUD D.Studies on photodegradation of two commercial dyes in aqueous phase using different photocatalysts[J].Journal of Hazardous Materials,2012,141(3):581-590.
[28] 朱永法,姚文清,宗瑞隆.光催化环境净化与绿色能源应用探索[M].北京:化学工业出版社,2014:127. ZHU Y F,YAO W Q,ZONG R L.Photocatalysis:application on environmental purification and green energy[M].Beijing:Chemical Industry Press,2014:127.