Please wait a minute...
Acta Phys. Chim. Sin.  2008, Vol. 24 Issue (09): 1584-1588    DOI: 10.1016/S1872-1508(08)60066-2
Reaction Mechanism on the Synergistic Photodegradation of Dye X3B and Photoreduction of Dichromate in the Presence of Polyoxometalate
LIU Ding, XU Yi-Ming
Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
Download:   PDF(326KB) Export: BibTeX | EndNote (RIS)      

Abstract  Photodegradation of a textile dye X3B and photoreduction of dichromate (Cr(VI)) in an acidic aqueous solution were studied under 320 nm cut-off UV light irradiation in the presence of two polyoxometalates (POM), H3PW12O40 (PW) and H4SiW12O40 (SiW). The reactions in POM-X3B-Cr(VI) systemwere faster than those in POM-X3B, POM-Cr(VI) and X3B-Cr(VI) systems. For all reactions, PWwas more photoactive than SiW. The reaction rates were proportional to the initial concentration of each component. The effects of N2, O2, and air were small but regular, indicating Cr(VI) photoreduction by a reduced POM. Quenching experiments with H2O2 and ethanol revealed that X3B photodegradation mainly occurred through hydroxyl radical (·OH). It was proposed that the production of·OH and a reduced POM- by the reaction between H2O and excited POM* was the rate determining step, with which all evidence could be well interpreted. Different effects of POM concentration in two-or three-component system on the reaction rates suggested that the reaction between H2Oand excited POM* was reversible.

Key wordsPhotocatalysis      Polyoxometalate      Dichromate      Organic dye      Photodegradation      Photoreduction     
Received: 08 April 2008      Published: 26 June 2008
MSC2000:  O643  
Corresponding Authors: XU Yi-Ming     E-mail:
Cite this article:

LIU Ding, XU Yi-Ming. Reaction Mechanism on the Synergistic Photodegradation of Dye X3B and Photoreduction of Dichromate in the Presence of Polyoxometalate. Acta Phys. Chim. Sin., 2008, 24(09): 1584-1588.

URL:     OR

[1] CHENG Ruo-Lin, JIN Xi-Xiong, FAN Xiang-Qian, WANG Min, TIAN Jian-Jian, ZHANG Ling-Xia, SHI Jian-Lin. Incorporation of N-Doped Reduced Graphene Oxide into Pyridine-Copolymerized g-C3N4 for Greatly Enhanced H2 Photocatalytic Evolution[J]. Acta Phys. Chim. Sin., 2017, 33(7): 1436-1445.
[2] HU Hai-Long, WANG Sheng, HOU Mei-Shun, LIU Fu-Sheng, WANG Tian-Zhen, LI Tian-Long, DONG Qian-Qian, ZHANG Xin. Preparation of p-CoFe2O4/n-CdS by Hydrothermal Method and Its Photocatalytic Hydrogen Production Activity[J]. Acta Phys. Chim. Sin., 2017, 33(3): 590-601.
[3] YANG Hai-Kuan. A Solution-Based Self-Assembly Approach to Preparing Functional Supramolecular Hybrid Materials[J]. Acta Phys. Chim. Sin., 2017, 33(3): 582-589.
[4] YUAN Hong, ZHANG Jing, WEI Xue-Hong, FANG Hui-Min, YUAN Shi-Fang, WU Li-Xin. Chiral Luminescent Liquid Crystal Material Based on Europium-Substituted Polyoxometalate[J]. Acta Phys. Chim. Sin., 2017, 33(2): 407-412.
[5] XIAO Ming, HUANG Zai-Yin, TANG Huan-Feng, LU Sang-Ting, LIU Chao. Facet Effect on Surface Thermodynamic Properties and In-situ Photocatalytic Thermokinetics of Ag3PO4[J]. Acta Phys. Chim. Sin., 2017, 33(2): 399-406.
[6] ZHANG Hao, LI Xin-Gang, CAI Jin-Meng, WANG Ya-Ting, WU Mo-Qing, DING Tong, MENG Ming, TIAN Ye. Effect of the Amount of Hydrofluoric Acid on the Structural Evolution and Photocatalytic Performance of Titanium Based Semiconductors[J]. Acta Phys. Chim. Sin., 2017, 33(10): 2072-2081.
[7] CHEN Yang, YANG Xiao-Yan, ZHANG Peng, LIU Dao-Sheng, GUI Jian-Zhou, PENG Hai-Long, LIU Dan. Noble Metal-Supported on Rod-Like ZnO Photocatalysts with Enhanced Photocatalytic Performance[J]. Acta Phys. Chim. Sin., 2017, 33(10): 2082-2091.
[8] QIU Wei-Tao, HUANG Yong-Chao, WANG Zi-Long, XIAO Shuang, JI Hong-Bing, TONG Ye-Xiang. Effective Strategies towards High-Performance Photoanodes for Photoelectrochemical Water Splitting[J]. Acta Phys. Chim. Sin., 2017, 33(1): 80-102.
[9] LU Yang. Recent Progress in Crystal Facet Effect of TiO2 Photocatalysts[J]. Acta Phys. Chim. Sin., 2016, 32(9): 2185-2196.
[10] ZHAO Fei, SHI Lin-Qi, CUI Jia-Bao, LIN Yan-Hong. Photogenerated Charge-Transfer Properties of Au-Loaded ZnO Hollow Sphere Composite Materials with Enhanced Photocatalytic Activity[J]. Acta Phys. Chim. Sin., 2016, 32(8): 2069-2076.
[11] MENG Ying-Shuang, AN Yi, GUO Qian, GE Ming. Synthesis and Photocatalytic Performance of a Magnetic AgBr/Ag3PO4/ZnFe2O4 Composite Catalyst[J]. Acta Phys. Chim. Sin., 2016, 32(8): 2077-2083.
[12] LUO Bang-De, XIONG Xian-Qiang, XU Yi-Ming. Improved Photocatalytic Activity for Phenol Degradation of Rutile TiO2 on the Addition of CuWO4 and Possible Mechanism[J]. Acta Phys. Chim. Sin., 2016, 32(7): 1758-1764.
[13] LIU Xiao-Ling, SONG Ji-Mei, DONG Na, HU Gang, YANG Jie, SI Wei, LI Wen-Hui. Synthesis and Adsorption Properties of Squamous BiOBr/Bi2WO6[J]. Acta Phys. Chim. Sin., 2016, 32(7): 1844-1850.
[14] ZHU Kai-Jian, YAO Wen-Qing, ZHU Yong-Fa. Preparation of Bismuth Phosphate Photocatalyst with High Dispersion by Refluxing Method[J]. Acta Phys. Chim. Sin., 2016, 32(6): 1519-1526.
[15] WANG Yan-Juan, SUN Jia-Yao, FENG Rui-Jiang, ZHANG Jian. Preparation of Ternary Metal Sulfide/g-C3N4 Heterojunction Catalysts and Their Photocatalytic Activity under Visible Light[J]. Acta Phys. Chim. Sin., 2016, 32(3): 728-736.