title: Highly Enhanced Photoreductive Degradation of Polybromodiphenyl Ethers with g-C3N4/TiO2 under Visible Light Irradiation.
abstract: A series of high activity photocatalysts g-C3N4-TiO2 were synthesized by simple one-pot thermal transformation method and characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller (BET) surface area, and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS). The g-C3N4-TiO2 samples show highly improved photoreductive capability for the degradation of polybromodiphenyl ethers compared with g-C3N4 under visible light irradiation. Among all the hybrids, 0.02-C3N4-TiO2 with 2 wt % g-C3N4 loaded shows the highest reaction rate, which is 15 times as high as that in bare g-C3N4. The well-matched band gaps in heterojunction g-C3N4-TiO2 not only strengthen the absorption intensity, but also show more effective charge carrier separation, which results in the highly enhanced photoreductive performance under visible light irradiation. The trapping experiments show that holetrapping agents largely affect the reaction rate. The rate of electron accumulation in the conductive band is the rate-determining step in the degradation reaction. A possible photoreductive mechanism has been proposed.
authors.affiliation: Department of Chemistry, Shaoxing University, Shaoxing 312000, Zhejiang, China. zjpjyeweidong@163.com.
authors.forename: Weidong
authors.initials: W
authors.lastname: Ye
authors.affiliation: Department of Chemistry, Shaoxing University, Shaoxing 312000, Zhejiang, China. hmilyariel@icloud.com.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Shao
authors.affiliation: Key laboratory of Coastal Zone Envirenmental Process and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, Shandong, China. xfhu@yic.ac.cn.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Hu
authors.affiliation: Department of Chemistry, Shaoxing University, Shaoxing 312000, Zhejiang, China. liuchunlin@usx.edu.cn.
authors.forename: Chulin
authors.initials: C
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Shaoxing University, Shaoxing 312000, Zhejiang, China. chunyansun74@gmail.com.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Sun
keywords: TiO2; g-C3N4; photoreductive; polybromodiphenyl ethers; visible light