• 文献标题:   Enhanced photo-reduction of chromium(VI) from aqueous solution by nanosheet hybrids of covalent organic framework and graphene-phase carbon nitride
  • 文献类型:   Article
  • 作  者:   ZHONG SC, WANG Y, LI SX, WANG S, QUE XY, SHENG L, PENG J, ZHAO L, YUAN LY, ZHAI ML
  • 作者关键词:   covalent organic framework, graphenephase carbon nitride, photocatalytic reduction, chromium vi
  • 出版物名称:   SEPARATION PURIFICATION TECHNOLOGY
  • ISSN:   1383-5866 EI 1873-3794
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1016/j.seppur.2022.121204 EA MAY 2022
  • 出版年:   2022

▎ 摘  要

Two new two-dimensional (2D) materials known as covalent organic framework (COF) and graphene phase carbon nitride nanosheets (CNNS) have induced great interests in photocatalysis due to their highly pi-conjugate structure and wide light absorption. Herein, metal-free COF-CNNS hybrids were synthesized in-situ for photo catalytic reduction of Cr(VI). The COF-CNNS hybrids exhibit great enhancement of photocatalytic performance compared to COF or CNNS alone, mainly due to the formation of heterojunctions and the more stable photoelectrons. Static photocatalytic experiment reveals that the COF-CNNS hybrids can remove more than 99% Cr(VI) in 30 min, representing one of the most effective and the fastest photocatalysts reported recently. X-ray diffraction and Fourier transform infrared spectroscopy indicate that the COF-CNNS hybrids have excellent stability during the photocatalytic reduction process. X-ray photoelectron spectroscopy of the COF-CNNS hybrids before and after Cr(VI) removal confirm the photo-reduction of Cr(VI) to Cr(III). Moreover, for the first time, dynamic column experiment of Cr(VI) photocatalytic reduction was conducted to simulate the real industrial wastewater treatment, and the removal ratio as high as 80% for Cr(VI) was obtained. The present work provides new clues to develop metal-free photocatalyst for heavy metals removal.