Nano-TiO₂-treated recycled aggregate-based photocatalytic mortar: Efficient NOx removal and mathematical modeling across diverse operational scenarios

IF 8.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Developments in the Built Environment Pub Date : 2025-03-01 Epub Date: 2025-01-10 DOI:10.1016/j.dibe.2025.100604

Xue-Fei Chen , Xiu-Cheng Zhang , Xiangping Xian , S Thomas Ng

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Abstract

Nano-TiO₂-treated (NT) recycled concrete aggregates (RA) were successfully integrated into the built environment by producing green photocatalytic mortar. Employing various microstructural characterization techniques, it was revealed that the old mortar layer of the RA possessed a porous surface structure, providing a significant specific surface area conducive to effective NT loading. A stable Ti-O-Si chemical bond was established between the surface of the RA and the NT through a hydroxylation treatment process, ensuring the durability of the green photocatalytic mortar during its manufacture and deployment within the built environment. This innovative mortar demonstrated an exceptional NOx removal efficiency of c.a. 90.75%. A predictive model was developed using the Back Propagation Neural Network, integrating experimental and theoretical data to optimize mortar performance across various scenarios. The findings mark a significant advancement in using RA in construction, contributing to sustainable development in the built environment.

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纳米二氧化钛处理的再生骨料光催化砂浆：不同操作场景下的高效NOx去除和数学建模

纳米二氧化钛处理（NT）再生混凝土骨料（RA）通过生产绿色光催化砂浆成功地融入建筑环境。采用各种微观结构表征技术，发现RA的旧砂浆层具有多孔表面结构，提供了有利于有效NT加载的显着比表面积。通过羟基化处理过程，在RA和NT表面之间建立了稳定的Ti-O-Si化学键，确保了绿色光催化砂浆在制造和在建筑环境中部署期间的耐久性。这种新型砂浆的NOx去除率高达90.75%。利用反向传播神经网络建立了一个预测模型，整合了实验和理论数据，以优化砂浆在各种情况下的性能。这些发现标志着在建筑中使用RA的重大进步，有助于建筑环境的可持续发展。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.