Performance of ferroelectric visible light type II Ag10Si4O13/TiO2 heterojunction photocatalyst

doi:10.1016/j.cattod.2022.03.009

	Performance of ferroelectric visible light type II Ag10Si4O13/TiO2 heterojunction photocatalyst
	Li, Cuixia 1,2; Sun, Huizhen 1; Jin, Haize 1,2; Li, Wenshen 1,2; Liu, Jingbo Louise 3,4; Bashir, Sajid 3
刊名	Catalysis Today
	2022-09-01
卷号	400-401 页码:146-158
关键词	Charge transfer Electronic properties Energy gap Ferroelectricity Heterojunctions Light Photocatalytic activity Polarization Semiconductor materials Silicon Silicon compounds Spectroscopic analysis Titanium dioxide Water pollution Water resources Ag10si4O13/TiO2 heterojunction Decolourization Efficient decomposition Methylene Blue Performance Semiconductor photocatalyst TiO 2 Type II Visible light Water remediation
ISSN号	0920-5861
DOI	10.1016/j.cattod.2022.03.009
英文摘要	Water remediation using semiconductor photocatalysts under visible light (VL) irradiance appears as a more sustainable technology option due to the greater penetration depth. Consequently, the overall band spectrum of VL has received significant attention to providing solutions to secure clean water resources over the past few decades. This research developed an innovative approach to enhancing the visible light susceptibility of semiconductor-based photocatalytic composites Ag10Si4O13/TiO2 (ASO/TO). The intrinsic properties of TO and electron donor ability of ASO lend synergistically to the generation of a narrow bandgap semiconductor. A feasible wet-chemistry method was found to engineer the electronic properties of ASO/TO under VL for rapid decolorization of methylene blue (MB). Inhibition experiments with several agents confirmed that the decolorization proceeds through the generation of hydroxyl radical species assisted by hole carrier generation at the ASO junction. The rate of MB decomposition followed a pseudo-first-order kinetic profile (98.2% within 35 mins under ambient conditions with 5 ppm of 2:1 ASO/TO and 20 ppm of MB). The XRD/XPS spectroscopic analysis confirms the electronic polarization of distorted SiO4 tetrahedral units coordinated to Ag-O, forming a double dumbbell double-helical structure. The staggered bandgap of these composite photocatalysts is associated with the Ag-Ag d10/sp hybridization and dispersive conduction band. At the same time, the 2p orbitals of TiO2 showed a less dispersive band due to the availability of D-orbitals. The generated Ag10Si4O13 (ASO) based ferroelectric materials allow amplifying its frequency due to internal polarization along the c-axis. The electrochemical evaluation also showed that the interface charge transfer resistance was lowered relative to TiO2, facilitating the efficacy of photocatalytic reactivity, where the generation of holes as charge carriers was the rate-limiting step. The novel nano-engineering strategy providing highly active photocatalysis can open new horizons for VL applications. © 2022 Elsevier B.V.
语种	英语
出版者	Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159144]
专题	材料科学与工程学院
作者单位	1.School of Materials Science and Engineering, Lanzhou University of Technology, 287 Langongping Rd, Qilihe District, Lanzhou; Gansu, China; 2.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, 287 Langongping Rd, Qilihe District, Lanzhou; Gansu, China; 3.The Department of Chemistry, Texas A&M University-Kingsville, MSC 161, 700 University Blvd, Kingsville; TX; 78363, United States; 4.The Texas A&M Energy Institute, Frederick E. Giesecke Engineering Research Bldg, 3372 TAMU, College Station; TX; 77843–3372, United States
推荐引用方式 GB/T 7714	Li, Cuixia,Sun, Huizhen,Jin, Haize,et al. Performance of ferroelectric visible light type II Ag10Si4O13/TiO2 heterojunction photocatalyst[J]. Catalysis Today,2022,400-401:146-158.
APA	Li, Cuixia,Sun, Huizhen,Jin, Haize,Li, Wenshen,Liu, Jingbo Louise,&Bashir, Sajid.(2022).Performance of ferroelectric visible light type II Ag10Si4O13/TiO2 heterojunction photocatalyst.Catalysis Today,400-401,146-158.
MLA	Li, Cuixia,et al."Performance of ferroelectric visible light type II Ag10Si4O13/TiO2 heterojunction photocatalyst".Catalysis Today 400-401(2022):146-158.