DOI码：10.1016/j.apcata.2015.11.005

所属单位：化学化工学院

发表刊物：Applied Catalysis A: General

关键字：Graphitic carbon nitride；Hydrothermal treatment；Adsorption；Photocatalytic reduction；Hexavalent chromium

摘要：An effective and environmental-friendly method was adopted to enhance the Cr(VI) adsorption and photocatalytic reduction activity of g-C3N4, which was prepared by thermal condensation of melamine. The enhancement was realized by hydrothermal treatment of g-C3N4 in 1.9–7.6 mol/L HNO3 aqueous solutions at 80–120 °C for 3–12 h. The compositions, structures and physiochemical properties of the hydrothermally treated g-C3N4 were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, N2 adsorption/desorption isotherms, Zeta potential analysis, UV–vis diffuse reflectance spectroscopy and photocurrent measurement, and their dark adsorption and visible-light (wavelength >420 nm)-driven photocatalytic reduction of Cr(VI) in aqueous solution were tested. It was found that the hydrothermally treated g-C3N4 exhibited significantly enhanced Cr(VI) adsorption and photocatalytic reduction activity than g-C3N4. Moreover, larger concentration of HNO3 aqueous solution, higher hydrothermal temperature or longer treatment time resulted in higher Cr(VI) adsorption and photocatalytic reduction activity of the hydrothermally treated g-C3N4. The reasons accounting for the enhanced Cr(VI) adsorption and photocatalytic reduction activity of the hydrothermally treated g-C3N4 were discussed, and the different mechanisms for the photocatalytic reduction of Cr(VI) over g-C3N4 and the hydrothermally treated g-C3N4 were also proposed.

论文类型：Research Atricle

论文编号：https://doi.org/10.1016/j.apcata.2015.11.005

学科门类：理学

一级学科：化学

文献类型：journal Article

卷号：521

页面范围：9-18

是否译文：否

发表时间：2016-07-05

收录刊物：SCI

发布期刊链接：https://doi.org/10.1016/j.apcata.2015.11.005