{"title":"Constructing a robust mesoporous S-scheme heterojunction AgVO3/ZnWO4 for visible-light-driven oxidation of atrazine","authors":"Wejdan T. Alsaggaf, Reda M. Mohamed","doi":"10.1016/j.ceramint.2025.06.252","DOIUrl":null,"url":null,"abstract":"<div><div><span><span>Effectively eliminating atrazine (Atr), a typical agricultural herbicide that possesses severe toxicological effects, is highly challenging. In this study, effective and novel </span>mesoporous<span> step (S)-type heterostructure AgVO</span></span><sub>3</sub>/ZnWO<sub>4</sub><span><span> (AV/ZW) photocatalysts<span> were fabricated to boost the photocatalytic decomposition (PCD) of Atr under </span></span>visible light illumination. Mesoporous ZnWO</span><sub>4</sub><span><span> (ZW) was manufactured hydrothermally with the assistance of poly(vinyl alcohol) (PVA) and subsequently modified with different concentrations of AV (3–12 wt%) through impregnation and calcination<span> procedures. Various analytical instruments were utilized to underscore the successful synthesis of the desired photocatalysts. The examination tools demonstrated that AV nanoparticles<span> (NPs) and ZW were closely coupled, forming AV/ZW heterojunctions. The construction of this heterojunction displayed a crucial role in synergistically promoting the light absorption capability, as well as boosting the spatial separation for light-induced charge carriers and optimizing the redox capacity, thereby drastically boosting the PCD of Atr. Particularly, the absorption edge was significantly improved from 388.27 nm (in </span></span></span>pure<span> ZW) to 528.51 nm following the incorporation 6 wt% AV NPs, and the band gap was reduced from 3.17 eV to 2.36 eV. Moreover, the light-induced charge carrier separation was considerably promoted with the AV insertion. Hence, the AV/ZW composites exhibited superior performances than pure ZW towards photodecomposition of Atr. Specifically, the optimal photocatalyst, 6 % AV/ZW, with an optimal dose (1.6 g/L) fully eliminated Atr (100 %) within only 40 min, with a reaction constant, K</span></span><sub>a</sub>, of 0.0608 min<sup>−1</sup> and reaction rate, R<sub>r</sub>, of 14.09 μM min<sup>−1</sup><span>, outperformed those attained over the pure AV and ZW by about 5.2- and 44-folds, separately. Also, the 6 % AV/ZW demonstrated superb stability within five consecutive runs. The findings of this study provide a pragmatic benchmark for the development of innovative heterostructure<span> photocatalysts aimed at ecological cleaning and water purification.</span></span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40193-40203"},"PeriodicalIF":5.6000,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0272884225029098","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
Effectively eliminating atrazine (Atr), a typical agricultural herbicide that possesses severe toxicological effects, is highly challenging. In this study, effective and novel mesoporous step (S)-type heterostructure AgVO3/ZnWO4 (AV/ZW) photocatalysts were fabricated to boost the photocatalytic decomposition (PCD) of Atr under visible light illumination. Mesoporous ZnWO4 (ZW) was manufactured hydrothermally with the assistance of poly(vinyl alcohol) (PVA) and subsequently modified with different concentrations of AV (3–12 wt%) through impregnation and calcination procedures. Various analytical instruments were utilized to underscore the successful synthesis of the desired photocatalysts. The examination tools demonstrated that AV nanoparticles (NPs) and ZW were closely coupled, forming AV/ZW heterojunctions. The construction of this heterojunction displayed a crucial role in synergistically promoting the light absorption capability, as well as boosting the spatial separation for light-induced charge carriers and optimizing the redox capacity, thereby drastically boosting the PCD of Atr. Particularly, the absorption edge was significantly improved from 388.27 nm (in pure ZW) to 528.51 nm following the incorporation 6 wt% AV NPs, and the band gap was reduced from 3.17 eV to 2.36 eV. Moreover, the light-induced charge carrier separation was considerably promoted with the AV insertion. Hence, the AV/ZW composites exhibited superior performances than pure ZW towards photodecomposition of Atr. Specifically, the optimal photocatalyst, 6 % AV/ZW, with an optimal dose (1.6 g/L) fully eliminated Atr (100 %) within only 40 min, with a reaction constant, Ka, of 0.0608 min−1 and reaction rate, Rr, of 14.09 μM min−1, outperformed those attained over the pure AV and ZW by about 5.2- and 44-folds, separately. Also, the 6 % AV/ZW demonstrated superb stability within five consecutive runs. The findings of this study provide a pragmatic benchmark for the development of innovative heterostructure photocatalysts aimed at ecological cleaning and water purification.
期刊介绍:
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.