Enhancement of carbonation, water purification and CO2 self-sequestration in hydrophobic piezo-photocatalytic carbonation coating for concrete

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-09-11 DOI:10.1016/j.cemconcomp.2024.105756

Guanyu Liu , Hailiang Fei , Jiayu Wu , Jiaxu Zhang , Tianzheng Zhao , Wenya Guo , Xingyue Wang , Sanqiang Yang

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Abstract

A eco-friendly carbonation coating (HBCC) with a piezo-photocatalysis was developed using gamma-dicalcium silicate and hydrophobic BiOI/BaTiO₃ (HB), aiming at purifying pollutants by multi-dimensional energy (mechanical energy and visible light) and self-sequestrating CO₂ produced by degrading pollutants. Based on the self-floating effect induced by the hydrophobicity of HB, the increase of catalyst content on the surface of HBCC was studied to promote the formation of a hydrophilic-hydrophobic interface. The selective adsorption of CO₂ and H₂O molecules by the hydrophilic-hydrophobic interface of HBCC was confirmed by simulations and experiments, which accelerates carbonation. Also, carbonation degree (37.1 %), bonding strength (40.1 %), and anti-corrosion performance (15.4 %) enhanced induced by accelerating carbonation was further confirmed. Additionally, HBBC exhibits the prominent degradation effect of Rhodamine b (90.8 %), methylene blue (86.6 %), and sulfamethoxazole (74.7 %) under ultrasound and visible light within 60 min. Meanwhile, CO₂ emitted by piezo-photocatalytic degradation pollutants can be efficient sequestration by HBCC itself, and the carbonation can be enhanced to further improve its bonding strength. Finally, the enhancement mechanism of carbonation, water purification, and CO₂ self-sequestration of HBBC was explored and ascertained.

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增强混凝土疏水性压电光催化碳化涂层的碳化、水净化和二氧化碳自封存功能

利用γ-硅酸二钙和疏水性BiOI/BaTiO3（HB）开发了一种具有压电光催化功能的环保碳化涂层（HBCC），旨在通过多维能量（机械能和可见光）净化污染物，并对降解污染物产生的二氧化碳进行自我封存。基于 HB 疏水性引起的自浮效应，研究了增加 HBCC 表面催化剂含量以促进亲水-疏水界面的形成。模拟和实验证实，HBCC 的亲水-疏水界面可选择性地吸附 CO2 和 H2O 分子，从而加速碳化。此外，加速碳化还进一步证实了碳化程度（37.1%）、结合强度（40.1%）和抗腐蚀性能（15.4%）的提高。此外，在超声波和可见光作用下，HBBC 在 60 分钟内对罗丹明 b（90.8%）、亚甲基蓝（86.6%）和磺胺甲噁唑（74.7%）的降解效果显著。同时，压电光催化降解污染物所释放的二氧化碳可被 HBCC 本身有效封存，并可增强碳化作用，进一步提高其粘结强度。最后，探讨并确定了 HBBC 的碳化、水净化和二氧化碳自我封存的增强机理。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.