Preparation, self-cleaning properties and mechanism of novel photocatalytic magnesia-based cementitious materials

IF 9.2 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2025-06-29 DOI:10.1016/j.susmat.2025.e01518

Jing Wen , Tingting Liu , Xiaogang Zheng , Congcong Ma , Yongshan Tan

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引用次数: 0

Abstract

Photocatalytic cement-based materials are characterized by abundant raw material sources, low preparation costs, and excellent pollutant degradation capabilities. In this study, a g-C₃N₄/BiOCl0_.5I_0.5 composite (BiO-CN2) was synthesized via high-temperature calcination and microwave-assisted solvothermal methods, then incorporated into magnesium oxychloride cement (MOC) to form BiOCN/MOC photocatalytic composites. The self-cleaning properties, compressive strength, hydration products, and microstructure of BiOCN/MOC were systematically evaluated. Results show that BiO-CN2 enhances the self-cleaning performance, with improved ability as BiO-CN2 content increases. The composite with 4 % BiOCN exhibited a 20.99 % increase in compressive strength. BiO-CN2 also provided additional nucleation sites, promoting MOC hydration and increasing crystallinity of the P5 phase (5 Mg(OH)₂·MgCl₂·8H₂O). The self-cleaning mechanism is attributed to the adsorption and chemical synergistic effect between BiO-CN2 and the P5 phase on RhB dye degradation.

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新型光催化镁基胶凝材料的制备、自清洁性能及机理研究

光催化水泥基材料具有原料来源丰富、制备成本低、降解污染物能力优异等特点。本研究通过高温煅烧和微波辅助溶剂热法合成了g-C3N4/BiOCl0.5I0.5复合材料（BiO-CN2），并将其掺入氯化氧化镁水泥（MOC）中，形成BiOCN/MOC光催化复合材料。系统评价了BiOCN/MOC的自洁性能、抗压强度、水化产物和微观结构。结果表明，BiO-CN2增强了自清洁性能，并随着BiO-CN2含量的增加而增强。添加4% BiOCN的复合材料抗压强度提高了20.99%。BiO-CN2还提供了额外的成核位点，促进MOC水化，提高了P5相（5mg (OH)2·MgCl2·8H2O）的结晶度。这种自清洁机制归因于BiO-CN2与P5相对RhB染料的吸附和化学协同作用。

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.