TiO2/EDTA-rich carbon composites:Synthesis,characterization and visible-light-driven photocatalytic reduction of Cr(Ⅵ)

作者：Zhijun Luo; Lingling Qu; Jianzhong Jia; Jing Wang; Suying Jiang; Zhiren Wu; Xiangyang Wu

来源：Chinese Chemical Letters, 2018, 29(03): 547-550.

Ti02/EDTA-rich carbon composites(TiO2/EDTA-RC) have been successfully synthesized via a low temperature carbonization process. TiO2/EDTA-RC exhibits marked absorption of visible light and excellent photoreduction of Cr(Ⅵ) activity under visible light irradiation(λ>420 nm). Due to the high carboxyl group content and strong coordination ability of EDTA, TiO2-EDTA complex can be easily fabricated between EDTA incorporated in carbon sheet and titanol group on the surface of TiO2. TiO2-EDTA complexes on the surface of TiO2/EDTA-RC, the LMCT complex, are responsible for the prominent photoreduction of Cr(Ⅵ) properties of Ti02/EDTA-RC under visible light irradiation. In addition, the unique structure ofTiO2/EDTA-RC is also propitious to the visible-light photocatalytic reduction of Cr(Ⅵ).Carbon sheet of TiO2/EDTA-RC acts as a supporter. TiO2 nanoparticles and EDTA homogeneously disperse into the carbon sheet supporter and form the TiO2-EDTA complexes, which can avoid the aggregation of TiO2 nanoparticles in the aqueous solution and provide more photocatalytic reaction points for the reduction of Cr(Ⅵ).