Preparation of Ag2CO3/Ag/g-C3N4 Z-scheme Heterostructure and Photocatalytic Degradation of Rhodamine B Under Visible Light
WANG Juan1,2, WANG Guo-hong1,2,3, SUN Ling-ling1,2
1. Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Hubei Normal University, Huangshi 435002, Hubei, China;
2. College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, Hubei, China;
3. Institute for Advanced Materials, Hubei Normal University, Huangshi 435002, Hubei, China
Abstract：The highly efficient Z-scheme photocatalyst Ag2CO3/Ag/g-C3N4 with Ag nanoparticles, as an electron mediator, was fabricated by a simple calcinations-precipitation reaction. Photocatalytic experiments of the as-prepared samples were tested by the photocatalytic oxidation degradation of RhB aqueous solution. The results show that Ag2CO3/Ag/g-C3N4 composites exhibit enhanced photocatalytic activity, compared with Ag2CO3 and g-C3N4. The composites exhibit the highest photocatalytic performance, when the mass ratio of g-C3N4 to Ag2CO3/Ag is 20%,which is attributed to the formation of Z-scheme heterojunction structure between Ag2CO3 and g-C3N4, thus accelerating electron transfer rate and separating efficiently the photo-generated electron-hole pairs. Meanwhile, the Z-scheme heterojunction structures extend the wavelength range of visible light absorption (from 450nm to 670nm) due to the surface plasma resonance (SPR) of Ag nanoparticles. The trapping experiment results confirm that·O2- and h+ are main active species,·OH plays a relatively minor role in the decomposition of RhB. A possible mechanism for enhanced photocatalytic activity of Ag2CO3/Ag/g-C3N4 heterojunction photocatalyst is proposed.
王娟, 王国宏, 孙玲玲. Ag2CO3/Ag/g-C3N4Z-型异质结的制备及可见光催化降解RhB[J]. 材料工程, 2018, 46(9): 39-45.
WANG Juan, WANG Guo-hong, SUN Ling-ling. Preparation of Ag2CO3/Ag/g-C3N4 Z-scheme Heterostructure and Photocatalytic Degradation of Rhodamine B Under Visible Light. Journal of Materials Engineering, 2018, 46(9): 39-45.
 RAN J R,YU J G,JARONIEC M. Ni(OH)2 modified CdS nanorods for highly efficient visible-light-driven photocatalytic H2 generation[J]. Green Chemistry,2011,13:2708-2713.
 刘欣伟,陈勇,陈昌兵,等. N掺杂纳米TiO2/电气石复合材料的制备及其光催化性能[J]. 材料工程,2016,44(6):104-109. LIU X W,CHEN Y,CHEN C B,et al. Preparation and photocatalytic activity of nitrogen-doped nano TiO2/tourmaline composites[J]. Journal of Materials Engineering,2016,44(6):104-109.
 刘阳龙,郑玉婴,曹宁宁, 等. 水热法合成铁掺杂的硫化镉及光催化性能[J]. 材料工程,2017,45(10):12-17. LIU Y L,ZHENG Y Y,CAO N N,et al. Synthesis and photocatalytic activity of iron doped CdS by hydrothermal method[J]. Journal of Materials Engineering,2017,45(10):12-17.
 赵燕茹,马建中,刘俊莉. 可见光响应型ZnO基纳米复合光催化材料的研究进展[J]. 材料工程,2017,45(6):129-137. ZHAO Y R,MA J Z,LIU J L. Research progress on visible-light responding ZnO-based nanocomposite photocatalyst[J]. Journal of Materials Engineering,2017,45(6):129-137.
 YU J G,YU X X,HUANG B B,et al. Hydrothermal synthesis and visible-light photocatalytic activity of novel cage-like ferric oxide hollow spheres[J]. Crystal Growth Design,2009,9(3):1474-1480.
 LIU Z F,ZHAO Z G,MIYAUCHI M. Efficient visible light active CaFe2O4/WO3 based composite photocatalysts:effect of interfacial modification[J]. Journal of Physical Chemistry C,2009,113:17132-17137.
 HE Y M,CAI J,LI T T,et al. Efficient degradation of RhB over GdVO4/g-C3N4 composites under visible-light irradiation[J]. Chemical Engineering Journal,2013,215/216:721-730.
 LI T T,ZHAO L H,HE Y M,et al. Synthesis of g-C3N4/SmVO4 composite photocatalyst with improved visible light photocatalytic activities in RhB degradation[J]. Applied Catalysis B:Environmental,2013,129:255-263.
 SONG Z,HE Y Q. Novel AgCl/Ag/AgFeO2 Z-scheme heterostructure photocatalyst with enhanced photocatalytic and stability under visible light[J]. Applied Surface Science,2017,420:911-918.
 GONG Y,QUAN X,YU H T,et al. Synthesis of Z-scheme Ag2CrO4/Ag/g-C3N4 composite with enhanced visible-light photocatalytic activity for 2,4-dichlorophenol degradation[J]. Applied Catalysis B:Environmental,2017,219:439-449.
 LOW J X,CHENG B,YU J G. Surface modification and enhanced photocatalytic CO2 reduction performance of TiO2:a review[J]. Applied Surface Science,2017,392:658-686.
 DAI G P,YU J G,LIU G. A new approach for photocorrosion inhibition of Ag2CO3 photocatalyst with highly visible-light-responsive reactivity[J]. Journal of Physical Chemistry C,2012,116:15519-15524.
 YANG X F,LI R,WANG Y Q,et al. Solvent-induced controllable synthesis of recyclable Ag2CO3 catalysts with enhanced visible light photocatalytic activity[J]. Ceramics International,2016,42:13411-13420.
 YU C L,WEI L F,CHEN J C,et al. Enhancing the photocatalytic performance of commercial TiO2 crystals by coupling with trace narrow-band-gap Ag2CO3[J]. Industrial & Engineering Chemistry Research,2014,53:5759-5766.
 DAI G P,LIU S Q,LIANG Y,et al. Fabrication of a nano-sized Ag2CO3/reduced graphene oxide photocatalyst with enhanced visible-light photocatalytic activity and stability[J]. RSC Advances,2014,4(65):34226-34231.
 CHEN L,YANG S D,HAO B,et al. Preparation of fiber-based plasmonic photocatalyst and its photocatalytic performance under the visible light[J]. Applied Catalysis B:Environmental,2015,166/167:287-294.
 WANG X C,MAEDA K,THOMAS A,et al. A metal-free polymeric photocatalyst for hydrogen production from water under visible light[J]. Nature Materials,2009,8:76-80.
 WANG X C,BLECHERT S,ANTONIETTI M. Polymeric graphitic carbon nitride for heterogeneous photocatalysis[J]. ACS Catalysis,2012,2(8):1596-1606.
 YAN S C,LI Z S,ZOU Z G. Photodegradation performance of g-C3N4 fabricated by directly heating melamine[J]. Langmuir,2009,25:10397-10401.
 XU H,SONG Y X,SONG Y H,et al. Synthesis and characterization of g-C3N4/Ag2CO3 with enhanced visible-light photocatalytic activity for the degradation of organic pollutants[J]. RSC Advances,2014,4(65):34539-34547.
 HAO R R,WANG G H,TANG H,et al. Template-free preparation of macro/mesoporous g-C3N4/TiO2 heterojunction photocatalysts with enhanced visible light photocatalytic activity[J]. Applied Catalysis B:Environmental,2016,187:47-58.
 TONDA S,KUMAR S,SHANKER V. In situ growth strategy for highly efficient Ag2CO3/g-C3N4 hetero/nanojunctions with enhanced photocatalytic activity under sunlight irradiation[J]. Journal of Environmental Chemical Engineering,2015,3(2):852-861.
 YU J G,YU H G,CHENG B,et al. Enhanced photocatalytic activity of TiO2 powder (P25) by hydrothermal treatment[J]. Journal of Molecular Catalysis A:Chemical,2006,253:112-118.
 LIANG Q H,SHI Y,MA W J,et al. Large-scale preparation and morphology-dependent photodegradation performances of monodispersed AgBr crystals[J]. Applied Catalysis A:General,2013,455:199-205.
 HU C,LAN Y Q,QU J H,et al. Ag/AgBr/TiO2 visible light photocatalyst for destruction of azodyes and bacteria[J]. Journal of Physical Chemistry B,2006,110:4066-4072.
 PRON A,REGHU R R,RYBAKIEWICZ R,et al. Triarylamine substituted arylene bisimides as solution processable organic semiconductors for field effect transistors. effect of substituent position on their spectroscopic, electrochemical, structural, and electrical transport properties[J]. Journal of Physical Chemistry C,2011,115:15008-15017.
 RESTA V,LAERA A M,PISCOPIELLO E,et al. Synthesis of CdS/TiO2 nanocomposites by using cadmium thiolate derivatives as unimolecular precursors[J]. Physica Status Solidi A,2010,207:1631-1635.
 KONG L,JIANG Z,LAI H H,et al. Unusual reactivity of visible-light-responsive AgBr-BiOBr heterojunction photocatalysts[J]. Journal of Catalysis,2012,293:116-125.
 XU M,HAN L,DONG S J. Facile fabrication of highly efficient g-C3N4/Ag2O heterostructured photocatalysts with enhanced visible-light photocatalytic activity[J]. ACS Applied Materials & Interfaces,2013,5(23):12533-12540.