Application of N-F-codoped TiO2 for the Photocatalytic Reduction of Cr(VI) under Visible Light Irradiation
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.
Qi Wang Zhaohui Wang Yi Zhang Yanqing Cong Jincai Zhao Peide Sun
School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Chi College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of C
国际会议
成都
英文
1-4
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）