Enhanced Photocatalytic Performances and Mechanistic Insights for Novel Ag-Bridged Dual Z-Scheme AgI/Ag3PO4/WO3 Composites

IF 3.4 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Inorganics Pub Date : 2025-07-01 DOI:10.3390/inorganics13070222

Chunlei Ma, Jianke Tang, Qi Wang, Rongqian Meng, Qiaoling Li

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引用次数: 1

Abstract

In this study, AgI/Ag3PO4/WO3 ternary composite photocatalysts with dual Z-scheme heterojunction were fabricated via the in situ loading of Ag3PO4 onto WO3 followed by anion exchange. Compared to single photocatalysts and binary composites, the AgI/Ag3PO4/WO3 composites exhibited enhanced photocatalytic activity in the photodegradation of chlortetracycline hydrochloride (CTC) under visible-light irradiation. Notably, the AAW-40 photocatalyst, which contained an AgI/Ag3PO4 molar ratio of 40%, degraded 75.7% of the CTC within 75 min. Moreover, AAW-40 demonstrated an excellent performance in the cyclic degradation of CTC over four cyclic degradation experiments. The separation and transfer kinetics of the AgI/Ag3PO4/WO3 composite were investigated with photoluminescence spectroscopy, time-resolved photoluminescence spectroscopy, and electrochemical measurements. The improved photocatalytic performance was primarily due to the creation of a silver-bridged dual Z-scheme heterojunction, which facilitated the efficient separation of photoinduced electron–hole pairs, retained the strong reducing capability of electrons in AgI, and ensured the strongly oxidizing nature of the photoexcited holes in WO3. The dual Z-scheme charge-transfer mechanism was further validated using in situ X-ray photoelectron spectroscopy. This study provides a foundation for developing innovative dual Z-scheme photocatalytic systems aimed at the efficient degradation of antibiotics in wastewater.

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新型ag桥接双Z-Scheme AgI/Ag3PO4/WO3复合材料增强光催化性能及机理研究

在本研究中，通过原位负载Ag3PO4到WO3上并进行阴离子交换，制备了具有双z -图式异质结的AgI/Ag3PO4/WO3三元复合光催化剂。与单一光催化剂和二元复合材料相比，AgI/Ag3PO4/WO3复合材料在可见光照射下对盐酸氯四环素（CTC）的光催化活性增强。值得注意的是，AgI/Ag3PO4摩尔比为40%的AAW-40光催化剂在75 min内降解了75.7%的CTC。此外，在四次循环降解实验中，AAW-40在CTC的循环降解中表现出优异的性能。采用光致发光光谱、时间分辨光致发光光谱和电化学测量研究了AgI/Ag3PO4/WO3复合材料的分离和转移动力学。光催化性能的提高主要是由于银桥双Z-scheme异质结的建立，促进了光诱导电子-空穴对的有效分离，保留了AgI中电子的强还原能力，并保证了WO3中光激发空穴的强氧化性。利用原位x射线光电子能谱进一步验证了双z型电荷转移机理。该研究为开发高效降解废水中抗生素的新型双z方案光催化系统奠定了基础。

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来源期刊

Inorganics Chemistry-Inorganic Chemistry

CiteScore

2.80

自引率

10.30%

发文量

193

审稿时长

6 weeks

期刊介绍： Inorganics is an open access journal that covers all aspects of inorganic chemistry research. Topics include but are not limited to: synthesis and characterization of inorganic compounds, complexes and materials structure and bonding in inorganic molecular and solid state compounds spectroscopic, magnetic, physical and chemical properties of inorganic compounds chemical reactivity, physical properties and applications of inorganic compounds and materials mechanisms of inorganic reactions organometallic compounds inorganic cluster chemistry heterogenous and homogeneous catalytic reactions promoted by inorganic compounds thermodynamics and kinetics of significant new and known inorganic compounds supramolecular systems and coordination polymers bio-inorganic chemistry and applications of inorganic compounds in biological systems and medicine environmental and sustainable energy applications of inorganic compounds and materials MD