Oxidation of 5-Hydroxymethylfurfural over ZnIn2S4/Ti3C2Tx Photocatalyst Modulated by Sulfur Vacancy Defects and Schottky Heterojunctions.

IF 6.6 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2025-09-23 DOI:10.1002/cssc.202501504
Xiaoping Wang, Bowen Yang, Haoye Wang, Haixin Guo, Richard Lee Smith, Yaqiong Su, Xinhua Qi
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引用次数: 0

Abstract

Conversion of biomass into chemical products with solar energy is an important avenue for technological sustainability. Constructing efficient Schottky heterojunctions with vacancy defects can be a productive approach for achieving photooxidation of 5-hydroxymethylfurfural (HMF). Herein, sulfur vacancy (Vs) defect-enriched ZnIn2S4 is combined with Ti3C2Tx MXene (Vs-ZIS/MX) containing Schottky heterojunctions via self-assembly to form photocatalysts for efficient oxidation of HMF to 2,5-diformylfuran (DFF) under air-ambient conditions. HMF conversion of 87.3% with 72.9% DFF selectivity is obtained by the Vs-ZIS/MX heterojunction photocatalyst under visible light (420 nm < λ <780 nm, 2 h). Density functional theory calculations reveal that the Schottky heterojunction and regulated S vacancies enhance the electronic coupling and lower HMF adsorption energy, establishing a directional electron transfer channel from Vs-ZIS to MXene and an enhanced built-in electric field. Extended X-ray absorption fine structure spectroscopy shows that a stable metal (Zn)O bond coordination is formed between Vs-ZIS and MXene, and the enrichment of local electrons at S vacancy defects sites and metal-O coordination makes it possible to extract the delocalized electrons from ZIS to MXene. This work demonstrates a method to modulate the electron cloud density and enhance transport with a built-in electric field on photogenerated carriers for catalytic conversion of organic alcohols.

硫空位缺陷和Schottky异质结调控ZnIn2S4/Ti3C2Tx光催化剂上5-羟甲基糠醛的氧化反应
利用太阳能将生物质转化为化学产品是实现技术可持续性的重要途径。构建具有空位缺陷的肖特基异质结是实现5-羟甲基糠醛(HMF)光氧化的有效途径。本文通过自组装将富硫空位(Vs)缺陷的ZnIn2S4与含Schottky异质结的Ti3C2Tx MXene (Vs- zis /MX)结合,形成光催化剂,在空气环境条件下将HMF高效氧化为2,5-二甲酰呋喃(DFF)。在420 nm可见光下,Vs-ZIS/MX异质结光催化剂的HMF转化率为87.3%,DFF选择性为72.9%
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来源期刊
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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