Constructing a robust mesoporous S-scheme heterojunction AgVO3/ZnWO4 for visible-light-driven oxidation of atrazine

IF 5.6 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Wejdan T. Alsaggaf, Reda M. Mohamed
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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.
构建稳健的介孔S-scheme异质结AgVO3/ZnWO4用于可见光氧化阿特拉津
莠去津(Atr)是一种典型的具有严重毒理学效应的农业除草剂,其有效去除具有很高的挑战性。本研究制备了有效的新型介孔阶梯(S)型异质结构AgVO3/ZnWO4 (AV/ZW)光催化剂,以促进Atr在可见光下的光催化分解(PCD)。在聚乙烯醇(PVA)的辅助下,通过水热法制备了介孔wo4 (ZW),然后通过浸渍和煅烧的方法,用不同浓度的AV (3-12 wt%)对其进行改性。利用各种分析仪器来强调所需要的光催化剂的成功合成。检测工具表明,AV纳米颗粒(NPs)与ZW紧密耦合,形成AV/ZW异质结。这种异质结的构建对协同提高Atr的光吸收能力、促进光诱导载流子的空间分离、优化氧化还原能力等方面发挥了至关重要的作用,从而大大提高了Atr的PCD。特别是,在加入6 wt% AV NPs后,吸收边从388.27 nm(纯ZW)显著提高到528.51 nm,带隙从3.17 eV减小到2.36 eV。此外,AV的插入大大促进了光诱导载流子的分离。因此,AV/ZW复合材料在光分解Atr方面表现出优于纯ZW的性能。其中,最佳光催化剂为6% AV/ZW,最佳剂量为1.6 g/L,反应常数Ka为0.0608 min−1,反应速率Rr为14.09 μM min−1,在40 min内完全消除Atr(100%),分别是纯AV和纯ZW的5.2倍和44倍。此外,6% AV/ZW在连续5次下入中表现出了出色的稳定性。本研究结果为开发用于生态清洁和水净化的新型异质结构光催化剂提供了实用基准。
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来源期刊
Ceramics International
Ceramics International 工程技术-材料科学:硅酸盐
CiteScore
9.40
自引率
15.40%
发文量
4558
审稿时长
25 days
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.
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