Please wait a minute...
Acta Phys. -Chim. Sin.  2004, Vol. 20 Issue (04): 355-359    DOI: 10.3866/PKU.WHXB20040404
Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO2 Photocatalyst
Liu Shou-Xin;Sun Cheng-Lin
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023;Northeast Forestry University, Harbin 150040
Download:   PDF(1618KB) Export: BibTeX | EndNote (RIS)      

Abstract  Under the condition that negative effects of proton starvation and photo-generated electron-hole recombination to the Cr6+ photocatalytic reduction process were minimized for the photocatalytic activities of TiO2 and Ag/TiO2 for Cr6+ reduction were comparatively investigated. Combined with the results of EPR, the mechanism of silver modification for the enhanced photocatalytic reduction of Cr6+ on TiO2 was discussed. The result revealed that Cr6+ reduction by the UV-Ag/TiO2 process was more effective than the UV-TiO2 process under the same conditions. Electron transfer from surface Ti3+ to Cr6+ was the key step for Cr6+ reduction. Cr6+ photocatalytic reduction by directly capturing photo-generated electrons is possible, but it occurs mainly indirectly by getting electrons from surface Ti3+. The higher reduction activity of Ag/TiO2 photocatalyst came mainly from the higher number of surface Ti3+.

Key wordsSilver      Titanium dioxide      Photocatalytic reduction      Hexavalent chromium     
Received: 25 September 2003      Published: 15 April 2004
Corresponding Authors: Sun Cheng-Lin     E-mail:
Cite this article:

Liu Shou-Xin;Sun Cheng-Lin. Mechanism of Silver Modification for the Enhanced Photocatalytic Activity of Cr(VI) Reduction on TiO2 Photocatalyst. Acta Phys. -Chim. Sin., 2004, 20(04): 355-359.

URL:     OR

[1] An XIE,Zhi WANG,Qiaoyu WU,Liping CHENG,Genggeng LUO,Di SUN. [Ag25(SC6H4Pri)18(dppp)6](CF3SO3)7·CH3CN (HSC6H4Pri = 4-t-isopropylthiophenol, and dppp = 1, 3-bis(diphenyphosphino)propane) Cluster Containing a Sandwich-like Skeleton: Structural Characterization and Optical Properties[J]. Acta Phys. -Chim. Sin., 2018, 34(7): 776-780.
[2] Chiaki TOMINAGA,Dailo HIKOSOU,Issey OSAKA,Hideya KAWASAK. Ag7(MBISA)6 Nanoclusters Conjugated with Quinacrine for FRET-Enhanced Photodynamic Activity under Visible Light Irradiation[J]. Acta Phys. -Chim. Sin., 2018, 34(7): 805-811.
[3] Xiu-Xiu WANG,Jian-Wei ZHAO,Gang YU. Combined Effects of the Hole and Twin Boundary on the Deformation of Ag Nanowires: a Molecular Dynamics Simulation Study[J]. Acta Phys. -Chim. Sin., 2017, 33(9): 1773-1780.
[4] Liang ZHOU,Xue-Hua ZHANG,Lin LIN,Pan LI,Kun-Juan SHAO,Chun-Zhong LI,Tao HE. Visible-Light Photocatalytic Reduction of CO2 by CoTe Prepared via a Template-Free Hydrothermal Method[J]. Acta Phys. -Chim. Sin., 2017, 33(9): 1884-1890.
[5] Yuan-Fei WU,Ming-Xue LI,Jian-Zhang ZHOU,De-Yin WU,Zhong-Qun TIAN. Density Functional Theoretical Study on SERS Chemical Enhancement Mechanism of 4-Mercaptopyridine Adsorbed on Silver[J]. Acta Phys. -Chim. Sin., 2017, 33(3): 530-538.
[6] Liang YU,Fang-Yong YU,Li-Li YUAN,Wei-Zi CAI,Jiang LIU,Cheng-Hao YANG,Mei-Lin LIU. Electrical Performance of Ag-Based Ceramic Composite Electrodes and Their Application in Solid Oxide Fuel Cells[J]. Acta Phys. -Chim. Sin., 2016, 32(2): 503-509.
[7] Yuan-Yuan WANG,Qun-Xing XU,Hua-Qing XIE,Zi-Hua WU,Jiao-Jiao XING. Monte-Carlo Simulations of the Effect of Surfactant on the Growth of Silver Dendritic Nanostructures[J]. Acta Phys. -Chim. Sin., 2016, 32(10): 2518-2522.
[8] Jie-Jun ZHU,Hai-Bin SUN,Yao-Zheng WU,Jian-Guo WAN,Guang-Hou WANG. Graphene: Synthesis, Characterization and Application in Transparent Conductive Films[J]. Acta Phys. -Chim. Sin., 2016, 32(10): 2399-2410.
[9] Qing GUO,Chuan-Yao ZHOU,Zhi-Bo MA,Ze-Feng REN,Hong-Jun FAN,Xue-Ming YANG. Fundamental Processes in Surface Photocatalysis on TiO2[J]. Acta Phys. -Chim. Sin., 2016, 32(1): 28-47.
[10] Jia. ZHAO,Li-Feng. LIU,Ying. ZHANG. Synthesis of Silver Nanoparticles Loaded onto a Structural Support and Their Catalytic Activity[J]. Acta Phys. -Chim. Sin., 2015, 31(8): 1549-1558.
[11] SHI Chen-Yang, HE Hui-Bin, HONG Zan-Fa, ZHAN Hong-Bing, FENG Miao. Effect of HCl Post-Treatment on Morphology of Hydrothermally Prepared Titanate Nanomaterials with Optical Limiting Properties[J]. Acta Phys. -Chim. Sin., 2015, 31(7): 1430-1436.
[12] ZHANG Qiao-Ling, LI Lei, LIU You-Zhi, WEI Bing, GUO Jia-Xin, FENG Yu-Jie. Grafting Dynamics, Structures and Properties of Nano TiO2-SA Photocatalytic Materials[J]. Acta Phys. -Chim. Sin., 2015, 31(6): 1015-1024.
[13] XU Jing, YANG De-Zhi, LIAO Xiao-Zhen, HE Yu-Shi, MA Zi-Feng. Electrochemical Performances of Reduced Graphene Oxide/Titanium Dioxide Composites for Sodium-Ion Batteries[J]. Acta Phys. -Chim. Sin., 2015, 31(5): 913-919.
[14] Zhi-Qiao. HE,Li-Li. TONG,Zhi-Peng. ZHANG,Jian-Meng. CHEN,Shuang. SONG. Ag/Ag2WO4 Plasmonic Catalyst for Photocatalytic Reduction of CO2 under Visible Light[J]. Acta Phys. -Chim. Sin., 2015, 31(12): 2341-2348.
[15] Chun-Mei. LIU,Guo-Ying. ZHANG,Xin. ZHANG,Yan-Yan. XU,Dong-Zhao. GAO. Hydrothermal Synthesis of Ag3PO4 Polyhedrons with Oriented {110} Facets and Visible-Light-Driven Photocatalytic Activity[J]. Acta Phys. -Chim. Sin., 2015, 31(10): 1939-1948.