Influence of microenvironment on photocatalytic purification performance of alkali-activated slag paste incorporating polymeric carbon nitride

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-08 DOI:10.1016/j.conbuildmat.2025.143937

Yu Yang , Jiakai Lin , Shuao Zhang , Tianhao Zhang , Zhenyan Zhou , Bing Li , Tao Ji

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引用次数: 0

Abstract

A prevalent strategy to augment the photocatalytic performance of cement-based materials involves the enhancement of photocatalyst dosage within the cement matrix. However, this often results in diminished mechanical properties and elevated costs. This study proposes a novel strategy to enhance the purification efficiency of photocatalytic cement-based materials by modulating the microenvironment surrounding the photocatalyst in the matrix. An alkali-activated slag cementitious system was selected for this study, where the type of activator (sodium silicate, sodium hydroxide, calcium oxide–sodium carbonate) and alkali equivalent (3–6 wt%) were varied to control the matrix microenvironment. The objective was to investigate its influence on the photocatalytic purification performance of polymeric carbon nitride (PCN) and the underlying mechanisms. The findings suggest that the presence of a sufficient quantity of highly crystalline hydrotalcite-like phases and calcium carbonate, in conjunction with an optimal pore solution pH, can augment the photocatalytic efficiency of PCN. Specifically, when the alkali equivalent was 4 wt%, the PCN-added alkali-activated slag cement paste exhibited the highest photocatalytic nitrogen oxide removal efficiency (23.8 %), which was 6.5 % higher than that of the sample with a 3 % alkali equivalent. This modified photocatalytic cementitious material has the potential for wide application as a paving overlay on building enclosures and road surfaces, thereby facilitating the sustainable degradation of atmospheric pollutants and rainwater runoff contaminants.

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微环境对含聚合氮化碳碱活性渣浆光催化净化性能的影响

增强水泥基材料光催化性能的一种普遍策略是增加水泥基质中的光催化剂用量。然而，这通常会导致机械性能下降和成本上升。本研究提出了一种通过调节基质中光催化剂周围微环境来提高光催化水泥基材料净化效率的新策略。本研究选择碱活化矿渣胶凝体系，通过改变活化剂类型（水玻璃、氢氧化钠、氧化钙-碳酸钠）和碱当量（3-6 wt%）来控制基质微环境。目的是研究其对聚合氮化碳（PCN）光催化净化性能的影响及其机制。研究结果表明，足够数量的高结晶型水滑石相和碳酸钙的存在，以及最佳的孔溶液pH值，可以提高PCN的光催化效率。其中，当碱当量为4 wt%时，加入pcn的碱活化矿渣水泥浆体的光催化氧化氮去除效率最高（23.8 %），比碱当量为3 %的样品高出6.5 %。这种改性光催化胶凝材料具有广泛应用的潜力，可作为建筑围护结构和路面的铺装覆盖物，从而促进大气污染物和雨水径流污染物的可持续降解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.