SmVO_4/g-C_3N_4异质结复合物对罗丹明B光催化性能研究
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摘要
制备了核壳异质结催化剂SmVO_4@g-C_3N_4和负载型异质结催化剂SmVO_4/g-C_3N_4,利用XRD、SEM-EDX、TEM、XPS及N2吸附等手段对其进行了表征,并考察其在可见光下对罗丹明B溶液的光催化活性。结果表明,核壳结构SmVO_4@gC_3N_4光催化活性明显高于SmVO_4和g-C_3N_4。但在几种催化剂中,负载量为8. 0%的Sm VO_4/g-C_3N_4样品的光催化活性最好。
Core-shell heterojunction catalyst SmVO_4@ g-C_3N_4 and a loaded heterojunction catalyst SmVO_4/g-C_3N_4 are prepared.The physical and chemical properties of as-obtained samples are characterized by using XRD,SEM-EDX,TEM,XPS and N2-sorption. And the samples' performance in photocatalytic degradation of rhodamine B under visible light irradiation is also investigated.The result shows that the photocatalytic performance of SmVO_4@ g-C_3N_4 is apparently higher than that of SmVO_4 and g-C_3N_4. SmVO_4/g-C_3N_4 catalyst with 8. 0 wt% loadings has the best photocatalytic activity.
Core-shell heterojunction catalyst SmVO_4@ g-C_3N_4 and a loaded heterojunction catalyst SmVO_4/g-C_3N_4 are prepared.The physical and chemical properties of as-obtained samples are characterized by using XRD,SEM-EDX,TEM,XPS and N2-sorption. And the samples' performance in photocatalytic degradation of rhodamine B under visible light irradiation is also investigated.The result shows that the photocatalytic performance of SmVO_4@ g-C_3N_4 is apparently higher than that of SmVO_4 and g-C_3N_4. SmVO_4/g-C_3N_4 catalyst with 8. 0 wt% loadings has the best photocatalytic activity.
引文
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[2]Zhang X W,Wang D K,Lopez D R S,et al,Fabrication of nanostructured Ti O2hollow fiber photocatalytic membrane and application for wastewater treatment[J]. Chemical Engineering Journal,2014,236:314-322.
[3]Barbero B P,Cadus L E. Vanadium species:Sm-V-O catalytic system for oxidative dehydrogenation of propane[J].Applied Catalysis A General,2003,244(2):235-249.
[4]He Y,Sheng T,Chen J,et al.Photodegradation of organics over a new composite catalyst V2O5/SmVO4[J]. Catalysis Communications,2009,10(9):1354-1357.
[5]Fox M A,Dulay M T.Heterogeneous photocatalysis[J].Chem Rev,1993,(93):341-357.
[6]Hoffman M R,Martin S T,Choi W Y,et al.Environmental applications of semiconductor photocatalysis[J].Chem Rev,1995,95(1):69-96.
[7]Bu Y,Chen Z,Yu J,et al.A novel application of g-C3N4,thin film in photoelectrochemical anticorrosion[J]. Electrochimica Acta,2013,88(2):294-300.
[8]Wang Y,Di Y,Antonietti M,et al.Excellent visible-light photocatalysis of fluorinated polymeric carbon nitride solids[J]. Chemistry of Materials,2010,22(18):5119-5121.
[9]Niu P,Zhang L,Liu G,et al. Graphene-like carbon nitride nanosheets for improved photocatalytic activities[J]. Advanced Functional Materials,2012,22(22):4763-4770.
[10]Yan S C,Li Z S,Zou Z G.Photodegradation performance of g-C3N4fabricated by directly heating melamine[J].Langmuir the Acs Journal of Surfaces&Colloids,2009,25(17):10397-10401.
[11]Chen X,Zhang J,Fu X,et al. Fe-g-C3N4-catalyzed oxidation of benzene to phenol using hydrogen peroxide and visible light[J].Journal of the American Chemical Society,2009,131(33):11658-11659.
[12]Liao G,Chen S,Quan X,et al.Graphene oxide modified g-C3N4hybrid with enhanced photocatalytic capability under visible light irradiation[J]. Journal of Materials Chemistry,2012,22(6):2721-2726.
[13]Nguyen T D,Dinh C T.A novel approach for monodisperse samariumorth ovanadate nanocrystals:Controlled synthesis and characterization[J]. Journal of Physical Chemistry C,2009,113(43):18584-18595.
[14]He Y M,Sheng T,Chen J S,et al.Photodegradation of organics over a new composite catalyst V2O5/SmVO4[J].Catalysis Commumnications,2009,10:1354-1357.
[15]Li T T,Zhao L H,He Y M,et al.Synthesis of g-C3N4/SmVO4composite photocatalyst with improved visible light photocatalytic activities in RhB degradation[J]. Applied Catalysis B:Environmental,2013,129:255-263.
[16]Zhao Y,Liu Z,Chu W,et al.Large-scale synthesis of nitrogen-rich carbon nitride microfibers by using graphitic carbon nitride as precursor[J].Advanced Materials,2008,20:1777-1781.
[17]Wang Y P,Han C J,Wang C,et al.A modified Johnson-Cook model for Cr2Ni4Mo V rotor steel over a wide range of temperature and strain rate[J]. Journal of Materials Science,2008,15:1120-1131.