Application of N-F-codoped TiO2 for the Photocatalytic Reduction of Cr(VI) under Visible Light Irradiation

被引：0
作者：
Wang, Qi [1 ]
Wang, Zhaohui [3 ]
Zhang, Yi [1 ]
Cong, Yanqing [1 ]
Zhao, Jincai [2 ]
Sun, Peide [1 ]
机构：
[1] Zhejiang Gongshang Univ, Sch Environm Sci & Engn, Hangzhou 310018, Zhejiang, Peoples R China
[2] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China
[3] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
来源：
2010 4TH INTERNATIONAL CONFERENCE ON BIOINFORMATICS AND BIOMEDICAL ENGINEERING (ICBBE 2010) | 2010年
关键词：
Cr(VI) reduction; Visible light; Photocatalytic; N-Fcodoped TiO2; CHROMATE REDUCTION; DOPED TIO2; METAL IONS; OXIDATION; ILLUMINATION; SUSPENSIONS; CHROMIUM;
D O I：
暂无
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
The visible light responsive N-F-codoped TiO2 (hereafter denoted as NFT) was prepared by sol-gel method using NH4F as precursor. NFT powders were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and ultravioletvisible diffuse reflection spectroscopy (UV-Vis-DRS). The asprepared NFT powders could efficiently reduce Cr(VI) to Cr(III) under visible light irradiation. The photocatalytic activities of NFT on the reduction of Cr(VI) was found to be strongly dependent on pH and the initial concentration of dopant. At low pH, the reduction efficiency was high. The activity increased firstly with the increase of initial dopant concentration and then decreased gradually. The highest activity was achieved when the initial NH4F/Ti molar ratio was 3. Moreover, addition of organic substances can greatly enhanced the Cr(VI) reduction rate due to synergistic effect. This study demonstrates a facile, fast and reproducible synthesis method for visible light responsive NFT photocatalyst and a potential way for environmental cleanup.
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页数：4
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共 21 条
[1]   Heterogeneous photocatalytic reduction of Cr(VI) in UV-irradiated titania suspensions: Effect of protons, ammonium ions, and other interfacial aspects [J].
Chenthamarakshan, CR ;
Rajeshwar, K .
LANGMUIR, 2000, 16 (06) :2715-2721
[2]   Visible light activity of TiO2 for the photoreduction of CCl4 and Cr(VI) in the presence of nonionic surfactant (Brij) [J].
Cho, YM ;
Kyung, H ;
Choi, W .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2004, 52 (01) :23-32
[3]   THE ROLE OF METAL-ION DOPANTS IN QUANTUM-SIZED TIO2 - CORRELATION BETWEEN PHOTOREACTIVITY AND CHARGE-CARRIER RECOMBINATION DYNAMICS [J].
CHOI, WY ;
TERMIN, A ;
HOFFMANN, MR .
JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (51) :13669-13679
[4]   Photocatalytic reduction of chromium and oxidation of organics by polyoxometalates [J].
Gkika, E ;
Troupis, A ;
Hiskia, A ;
Papaconstantinou, E .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2006, 62 (1-2) :28-34
[5]   Visible-light-activated nanoparticle photocatalyst of iodine-doped titanium dioxide [J].
Hong, XT ;
Wang, ZP ;
Cai, WM ;
Lu, F ;
Zhang, J ;
Yang, YZ ;
Ma, N ;
Liu, YJ .
CHEMISTRY OF MATERIALS, 2005, 17 (06) :1548-1552
[6]   Photocatalytic reduction of environmental pollutant Cr(VI) over some semiconductors under UV/visible light illumination [J].
Khalil, LB ;
Mourad, WE ;
Rophael, MW .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 17 (03) :267-273
[7]   Chromium occurrence in the environment and methods of its speciation [J].
Kotas, J ;
Stasicka, Z .
ENVIRONMENTAL POLLUTION, 2000, 107 (03) :263-283
[8]   Simultaneous and synergistic conversion of dyes and heavy metal ions in aqueous TiO2 suspensions under visible-light illumination [J].
Kyung, H ;
Lee, J ;
Choi, WY .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2005, 39 (07) :2376-2382
[9]   Reduction of aqueous chromate by Fe(11)/Fe(111) carbonate green rust: Kinetic and mechanistic studies [J].
Legrand, L ;
EL Figuigui, A ;
Mercier, F ;
Chausse, A .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2004, 38 (17) :4587-4595
[10]   Heterogeneous photocatalysis - Transition metal ions in photocatalytic systems [J].
Litter, MI .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1999, 23 (2-3) :89-114
123