当前位置:
X-MOL 学术
›
Cement Concrete Comp.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Enhancing photocatalytic efficiency and interfacial bonding on cement-based surfaces by constructing CaO-TiO2 hybrid catalysts
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.cemconcomp.2025.105944
Xunli Jiang, Jian-Xin Lu, Yuqing Zhang, Chi Sun Poon
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.cemconcomp.2025.105944
Xunli Jiang, Jian-Xin Lu, Yuqing Zhang, Chi Sun Poon
The application of titanium dioxide (TiO2 ) coating in cement-based materials faces challenges regarding its durability. This study presented the concept of ‘induced bonding’ for enhancing coating adhesion. By modifying TiO2 with CaO, nucleation sites were constructed on its surface, inducing the growth of hydration products and connecting the catalytic materials to the substrate. As a result, a novel dual-effect CaO-TiO2 hybrid catalytic material with enhanced photocatalytic efficiency and interfacial bonding was successfully developed using a mechanochemical-thermochemical method. The CaO-TiO2 catalyst was coated onto cement surfaces, and the mechanisms of interface enhancement were revealed by micro-scratch and microstructural tests. The results indicated that the synthetic catalytic materials exhibited excellent NO photocatalytic degradation performance, particularly at an activation temperature of 300 °C; the optimized NO degradation efficiency hit around 40 % with a NOx comprehensive removal amount approximately twice that of conventional TiO2 . Moreover, the minimal generation of NO2 demonstrated a strong photocatalytic selectivity. This exceptional photocatalytic performance can be attributed to the interaction between TiO2 and CaO, along with its derivatives such as CaTiO3 and CaCO3 , which promoted the formation of active species (•OH, •O2− , h+ ), and increased the absorption efficiency in the visible light region. Furthermore, the wear resistance and interface critical load of CaO-TiO2 coatings were more robust than reference coatings. The CaO-TiO2 catalyst promoted hydration to form widely distributed and interlocked fibrous C-S-H gel, bridging the catalyst particles and enhancing the adhesion of the coating with the cement substrate, thereby improving its interfacial bonding performance.
中文翻译:
通过构建 CaO-TiO2 杂化催化剂提高光催化效率和水泥基表面的界面结合
二氧化钛 (TiO2) 涂料在水泥基材料中的应用面临耐久性方面的挑战。本研究提出了增强涂层附着力的 “诱导粘接 ”的概念。通过用 CaO 修饰 TiO2,在其表面构建成核位点,诱导水合产物的生长并将催化材料连接到基材上。结果,采用机械化学-热化学方法成功开发了一种新型双效 CaO-TiO2 杂化催化材料,具有增强的光催化效率和界面键合。将 CaO-TiO2 催化剂涂覆在水泥表面,并通过微划痕和微观结构测试揭示了界面增强的机制。结果表明,合成催化材料表现出优异的NO光催化降解性能,特别是在300 °C的活化温度下;优化后的 NO 降解效率达到 40 % 左右,NOx 综合去除量约为传统 TiO2 的两倍。此外,最少的 NO2 生成表现出很强的光催化选择性。这种卓越的光催化性能可归因于 TiO2 和 CaO 及其衍生物(如 CaTiO3 和 CaCO3)之间的相互作用,它们促进了活性物质 (•OH, •O2−, h+) 的形成,并提高了可见光区域的吸收效率。此外,CaO-TiO2 涂层的耐磨性和界面临界载荷比参考涂层更坚固。 CaO-TiO2 催化剂促进水化形成广泛分布和互锁的纤维 C-S-H 凝胶,桥接催化剂颗粒并增强涂层与水泥基材的粘附力,从而提高其界面粘合性能。
更新日期:2025-01-21
中文翻译:
通过构建 CaO-TiO2 杂化催化剂提高光催化效率和水泥基表面的界面结合
二氧化钛 (TiO2) 涂料在水泥基材料中的应用面临耐久性方面的挑战。本研究提出了增强涂层附着力的 “诱导粘接 ”的概念。通过用 CaO 修饰 TiO2,在其表面构建成核位点,诱导水合产物的生长并将催化材料连接到基材上。结果,采用机械化学-热化学方法成功开发了一种新型双效 CaO-TiO2 杂化催化材料,具有增强的光催化效率和界面键合。将 CaO-TiO2 催化剂涂覆在水泥表面,并通过微划痕和微观结构测试揭示了界面增强的机制。结果表明,合成催化材料表现出优异的NO光催化降解性能,特别是在300 °C的活化温度下;优化后的 NO 降解效率达到 40 % 左右,NOx 综合去除量约为传统 TiO2 的两倍。此外,最少的 NO2 生成表现出很强的光催化选择性。这种卓越的光催化性能可归因于 TiO2 和 CaO 及其衍生物(如 CaTiO3 和 CaCO3)之间的相互作用,它们促进了活性物质 (•OH, •O2−, h+) 的形成,并提高了可见光区域的吸收效率。此外,CaO-TiO2 涂层的耐磨性和界面临界载荷比参考涂层更坚固。 CaO-TiO2 催化剂促进水化形成广泛分布和互锁的纤维 C-S-H 凝胶,桥接催化剂颗粒并增强涂层与水泥基材的粘附力,从而提高其界面粘合性能。