Crystal phase regulation toward CeVO4/(m-s/z-t) BiVO4 heterostructures for accelerated degradation of aquatic pollutants

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2026-10-01 Epub Date: 2026-07-11 DOI:10.1016/j.ceramint.2026.07.184

Shengli Chen, Yangwen Xia, Yuanyuan Zhong, Fengyun Sun, Menghua Li, Lu Chen, Dong Liu, Shihu Han, Xiaodong Zhu, Chao Wan

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Abstract

To address the challenges of high photogenerated carrier recombination rate and strong crystal phase dependence in monoclinic scheelite bismuth vanadate (m-s BiVO₄), this study demonstrates a crystal phase regulation strategy. By introducing tetragonal CeVO₄ via a hydrothermal method, we induced the phase transition of BiVO₄ from monoclinic scheelite (m-s) to zircon-tetragonal (z-t), constructing a CeVO₄/(m-s/z-t) BiVO₄ triphasic heterojunction composite. XRD, SEM, TEM, and XPS characterizations confirmed that CeVO₄ incorporation altered the BiVO₄ phase ratio and established a three-phase interfacial coupling structure. Photocatalytic degradation experiments demonstrated that the 1:4 CVO/BVO sample exhibited a first-order reaction rate constant (k = 0.02381 min⁻¹) 2.1 and 7.6 times that of pure BiVO₄ and pure CeVO₄, respectively. Electron spin resonance (ESR) and radical scavenger assays confirmed superoxide radicals (·O₂⁻) as the primary active species. A synergistic mechanism was proposed, where the n-p-n heterojunction's built-in electric field and mixed-phase synergy jointly promote charge separation.

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CeVO4/(m-s/z-t) BiVO4异质结构的晶相调控对水生污染物的加速降解

为了解决单斜白钨矿钒酸铋（m-s BiVO4）的高光生载流子重组率和强晶相依赖性的挑战，本研究提出了一种晶相调节策略。通过水热法引入四方CeVO4，诱导BiVO4由单斜白钨矿（m-s）向锆对四方（z-t）相转变，构建了CeVO4/(m-s/z-t) BiVO4三相异质结复合材料。XRD、SEM、TEM和XPS表征证实CeVO4的掺入改变了BiVO4相比，建立了三相界面耦合结构。光催化降解实验表明，1:4 CVO/BVO样品的一级反应速率常数（k = 0.02381 min−1）分别是纯BiVO4和纯CeVO4的2.1倍和7.6倍。电子自旋共振（ESR）和自由基清除剂实验证实超氧自由基（·O2−）是主要的活性物质。提出了n-p-n异质结内置电场和混合相协同作用共同促进电荷分离的协同机制。

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来源期刊

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.