Z型可见光催化剂Au NPs/g-C_3N_4/BiOBr的构建及其光催化性能（英文）
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摘要
通过水热和原位还原法制备了一种新型Z型异质结三元复合材料Au NPs/g-C_3N_4/BiOBr,并通过X射线衍射、X射线光电子能谱、透射电子显微镜、紫外-可见漫反射光谱和光致发光发射光谱等技术对材料的形貌、结构进行了表征。通过在可见光下降解苯酚来评价光催化剂的活性。研究发现,Au NPs/g-C3N4/BiOBr显示出增强的光催化活性,对苯酚的降解能力是g-C_3N_4的3倍,是BiOBr的2.5倍。这可归因于三元复合材料的窄带隙(2.10 eV)、Z型机理对光生电子-空穴对的有效分离和Au纳米颗粒的表面等离子体共振效应(SPR)。
A novel ternary Au NPs/g-C_3N_4/BiOBr Z-scheme heterojunction composite was fabricated through hydrothermal and insitu reduction method,and characterized by X-ray diffraction,X-ray photoelectron spectroscopy,transmission electron microscopy,ultraviolet-visible diffuse reflection spectroscopy and photoluminescence emission spectroscopy. The photocatalytic activity was evaluated by the degradation of phenol under visible-light irradiation. It was found that Au NPs/g-C_3N_4/BiOBr showed enhanced photocatalytic activity,which is 3-fold higher than g-C3 N4 and 2.5-fold higher than BiOBr. This could be attributed to the effective separation of photogenerated electron-hole pairs,narrowed band gap( 2.10 eV) and surface plasmon resonance( SPR).
A novel ternary Au NPs/g-C_3N_4/BiOBr Z-scheme heterojunction composite was fabricated through hydrothermal and insitu reduction method,and characterized by X-ray diffraction,X-ray photoelectron spectroscopy,transmission electron microscopy,ultraviolet-visible diffuse reflection spectroscopy and photoluminescence emission spectroscopy. The photocatalytic activity was evaluated by the degradation of phenol under visible-light irradiation. It was found that Au NPs/g-C_3N_4/BiOBr showed enhanced photocatalytic activity,which is 3-fold higher than g-C3 N4 and 2.5-fold higher than BiOBr. This could be attributed to the effective separation of photogenerated electron-hole pairs,narrowed band gap( 2.10 eV) and surface plasmon resonance( SPR).
引文
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[21]LIU X,CAI L.Novel indirect Z-scheme photocatalyst of Ag nanoparticles and polymer polypyrrole co-modified BiOBr for photocatalytic decomposition of organic pollutants[J].Appl Surf Sci,2018,445:242-254.
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[23]GAO H,ZHANG P,ZHAO J,ZHANG Y,HU J,SHAO G,Plasmon enhancement on photocatalytic hydrogen production over the Z-scheme photosynthetic heterojunction system[J].Appl Catal B:Environ,2017,210:297-305.
[24]YANG Y,GUO W,GUO Y,ZHAO Y,YUAN X,GUO Y.Fabrication of Z-scheme plasmonic photocatalyst Ag@AgBr/g-C3N4w ith enhanced visible-light photocatalytic activity[J].J Hazard Mater,2014,271:150-159.
[25]HOU J,WANG Z,YANG C,ZHOU W,JIAO S,ZHU H.Hierarchically plasmonic Z-scheme photocatalyst of Ag/AgCl nanocrystals decorated mesoporous single-crystalline metastable Bi20TiO32nanosheets[J].J Phys Chem C,2013,117(10):5132-5141.
[26]YU X,WU P,QI C,SHI J,FENG L,LI C,WANG L.Ternary-component reduced graphene oxide aerogel constructed by g-C3N4/BiOBr heterojunction and graphene oxide w ith enhanced photocatalytic performance[J].J Alloy Compd,2017,729:162-170.
[27]GUO Y,ZHANG J,ZHOU D,DONG S.Fabrication of Ag/CDots/BiOBr ternary photocatalyst with enhanced visible-light driven photocatalytic activity for 4-chlorophenol degradation[J].J Mol Liq,2018,262:194-203.
[2]CHENG N,TIAN J,LIU Q,GE C,QUSTI A H,ASIRI A M,AL-YOUBI A O,SUN X.Au-nanoparticle-loaded graphitic carbon nitride nanosheets:Green photocatalytic synthesis and application tow ard the degradation of organic pollutants[J].ACS Appl Mater Inter,2013,5(15):6815-6819.
[3]ZHAO Y,WANG W,LI Y,ZHANG Y,YAN Z,HUO Z.Hierarchical branched Cu2O nanow ires w ith enhanced photocatalytic activity and stability for H2production[J].Nanoscale,2014,6(1):195-198.
[4]CHONG B,CHEN L,WANG W,HAN D,WANG L,FENG L,LI Q,LI C.Visible-light-driven Ag-decorated g-C3N4/Bi2WO6 Z-scheme composite for high photocatalytic activity[J].Mater Lett,2017,204:149-153.
[5]WANG L,SUN B,WANG W,FENG L,LI Q,LI C.Modification of Bi2WO6composites w ith r GO for enhanced visible light driven NOremoval[J].Asia Pac J Chem Eng,2017,12(1):121-127.
[6]QU M,WAN S,ZHONG Q,ZHANG S,SONG Y,GUO L,CAI W,XU Y.Hierarchical Z-scheme photocatalyst of g-C3N4@Ag/BiVO4(040)with enhanced visible-light-induced photocatalytic oxidation performance[J].Appl Catal B:Environ,2018,221:97-107.
[7]SAFAEI J,ULLAH H,MOHAMED N A,MOHAMED NOH MF,SOH MF,TAHIR A A,AHMAD LUDIN N,IBRAHIMMA,WANISAHAK W N R,MAT TERIDI MA.Enhanced photoelectrochemical performance of Z-scheme g-C3N4/BiVO4photocatalyst[J].Appl Catal B:Environ,2018,234:296-310.
[8]YE L,LIU J,JIANG Z,PENG T,ZAN L.Facets coupling of BiOBr-g-C3N4composite photocatalyst for enhanced visible-light-driven photocatalytic activity[J].Appl Catal B:Environ,2013,142-143:1-7.
[9]YANG Z,LI J,CHENG F,CHEN Z,DONG X.BiOBr/protonated graphitic C3N4heterojunctions:Intimate interfaces by electrostatic interaction and enhanced photocatalytic activity[J].J Alloy Compd,2015,634:215-222.
[10]ZHENG Y,JIAO Y,ZHU Y,LI L H,HAN Y,CHEN Y,DU A,JARONIEC M,QIAO S Z.Hydrogen evolution by a metal-free electrocatalyst[J].Nat Commun,2014,5(3783):1-8.
[11]LI J,SHEN B,HONG Z,LIN B,GAO B,CHEN Y.A facile approach to synthesize novel oxygen-doped g-C3N4w ith superior visible-light photoreactivity[J].Chem Commun,2012,48(98):12017-12019.
[12]JIANG M,SHI Y,HUANG J,WANG L,SHE H,TONG J,SU B,WANG Q.Synthesis of flowerlike g-C3N4/BiOBr w ith enhanced visible light photocatalytic activity for dye degradation[J].Eur J Inorg Chem,2018,2018(17):1834-1841.
[13]LI W,FENG C,DAI S,YUE J,HUA F,HOU H.Fabrication of sulfur-doped g-C3N4/Au/CdS Z-scheme photocatalyst to improve the photocatalytic performance under visible light[J].Appl Catal B:Environ,2015,168-169:465-471.
[14]TONDA S,KUMAR S,KANDULA S,SHANKER V.Fe-doped and mediated graphitic carbon nitride nanosheets for enhanced photocatalytic performance under natural sunlight[J].J Mater Chem A,2014,2(19):6772-6780.
[15]WANG H,ZHANG L,CHEN Z,HU J,LI S,WANG Z,LIU J,WANG X.Semiconductor heterojunction photocatalysts:Design,construction,and photocatalytic performances[J].Chem Soc Rev,2014,43(15):5234-5244.
[16]HUANG Z,SONG J,WANG X,PAN L,LI K,ZHANG X,WANG L.Switching charge transfer of C3N4/W18O49from type-II to Z-scheme by interfacial band bending for highly efficient photocatalytic hydrogen evolution[J].Nano Energy,2017,10:308-316.
[17]PAN L,ZHANG J,JIA X,MA Y,ZHANG X,WANG L,ZOU J.Highly efficient Z-scheme WO3-xquantum dots/TiO2for photocatalytic hydrogen generation[J].Chin J Catal,2017,38(2):253-259.
[18]JIA X,M.TAHIR,PAN L,HUANG Z,ZHANG X,WANG L,ZOU J.Direct Z-scheme composite of CdS and oxygen-defected CdWO4:An efficient visible-light-driven photocatalyst for hydrogen evolution[J].Appl Catal B:Environ,2016,12:154-161.
[19]FU J,TIAN Y,CHANG B,XI F,DONG X.BiOBr-carbon nitride heterojunctions:Synthesis,enhanced activity and photocatalytic mechanism[J].J Mater Chem,2012,22(39):21159-21166.
[20]WANG W,WU Z,EFTEKHARI E,HUO Z,LI X,TADE MO,YAN C,YAN Z,LI C,LI Q,ZHAO D,High performance heterojunction photocatalytic membranes formed by embedding Cu2O and TiO2nanow ires in reduced graphene oxide[J].Catal Sci Technol,2018,8(6):1704-1711.
[21]LIU X,CAI L.Novel indirect Z-scheme photocatalyst of Ag nanoparticles and polymer polypyrrole co-modified BiOBr for photocatalytic decomposition of organic pollutants[J].Appl Surf Sci,2018,445:242-254.
[22]DI J,XIA J,YIN S,XU H,HE M,LI H,XU L,JIANG Y.A g-C3N4/BiOBr visible-light-driven composite:Synthesis via a reactable ionic liquid and improved photocatalytic activity[J].RSC Adv,2013,3(42):19624-19631.
[23]GAO H,ZHANG P,ZHAO J,ZHANG Y,HU J,SHAO G,Plasmon enhancement on photocatalytic hydrogen production over the Z-scheme photosynthetic heterojunction system[J].Appl Catal B:Environ,2017,210:297-305.
[24]YANG Y,GUO W,GUO Y,ZHAO Y,YUAN X,GUO Y.Fabrication of Z-scheme plasmonic photocatalyst Ag@AgBr/g-C3N4w ith enhanced visible-light photocatalytic activity[J].J Hazard Mater,2014,271:150-159.
[25]HOU J,WANG Z,YANG C,ZHOU W,JIAO S,ZHU H.Hierarchically plasmonic Z-scheme photocatalyst of Ag/AgCl nanocrystals decorated mesoporous single-crystalline metastable Bi20TiO32nanosheets[J].J Phys Chem C,2013,117(10):5132-5141.
[26]YU X,WU P,QI C,SHI J,FENG L,LI C,WANG L.Ternary-component reduced graphene oxide aerogel constructed by g-C3N4/BiOBr heterojunction and graphene oxide w ith enhanced photocatalytic performance[J].J Alloy Compd,2017,729:162-170.
[27]GUO Y,ZHANG J,ZHOU D,DONG S.Fabrication of Ag/CDots/BiOBr ternary photocatalyst with enhanced visible-light driven photocatalytic activity for 4-chlorophenol degradation[J].J Mol Liq,2018,262:194-203.
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