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<p>In this study, a ZnIn<sub>2</sub>S<sub>4</sub>@MgAl-LDH (ZIS-LDH) composite photocatalyst was synthesized via a mechanochemical approach and subsequently co-grown in situ as a functional layer on a cement-based substrate to address the urgent need for efficient NO<sub>2</sub> removal in urban air. The structure of the ZIS-LDH catalyst was characterized using XRD, TEM, SEM, EDS, and FTIR. The photocatalytic performance of the ZIS-LDH coating was evaluated through NO<sub>2</sub> degradation experiments conducted in a custom-built gas-phase photocatalytic reaction system. A 50&#xa0;μm-thick ZIS-LDH film maintained 85.5% NO<sub>2</sub> removal efficiency after 40&#xa0;min of continuous irradiation. In addition, the photocatalytic activity of the ZIS-LDH composite was evaluated in the liquid phase for methylene blue (MB) degradation. Under visible light irradiation, the ZIS-LDH composite achieved a high degradation rate of 94.10% for MB within 30&#xa0;min. This work presents a cost-effective and durable strategy for integrating high-performance photocatalysts into built-environment infrastructure, with promising potential for further optimization toward VOC and heavy-metal abatement. The novelty of this research lies in the innovative in situ growth of the ZIS-LDH coating, which ensures robust interfacial bonding with the cement substrate, enhancing both photocatalytic efficiency and long-term durability in real-world applications.</p> Graphical Abstract <p></p>

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ZnIn2S4@MgAl-LDH Heterojunction Coatings on Cement: Interfacial Engineering for NO2 Degradation

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Wenhui Wang,
  • Liyuan Gao,
  • Lixue Xu,
  • Yanmin Wang,
  • Min Chen,
  • Xiaoning Wang,
  • Jin Li

摘要

In this study, a ZnIn2S4@MgAl-LDH (ZIS-LDH) composite photocatalyst was synthesized via a mechanochemical approach and subsequently co-grown in situ as a functional layer on a cement-based substrate to address the urgent need for efficient NO2 removal in urban air. The structure of the ZIS-LDH catalyst was characterized using XRD, TEM, SEM, EDS, and FTIR. The photocatalytic performance of the ZIS-LDH coating was evaluated through NO2 degradation experiments conducted in a custom-built gas-phase photocatalytic reaction system. A 50 μm-thick ZIS-LDH film maintained 85.5% NO2 removal efficiency after 40 min of continuous irradiation. In addition, the photocatalytic activity of the ZIS-LDH composite was evaluated in the liquid phase for methylene blue (MB) degradation. Under visible light irradiation, the ZIS-LDH composite achieved a high degradation rate of 94.10% for MB within 30 min. This work presents a cost-effective and durable strategy for integrating high-performance photocatalysts into built-environment infrastructure, with promising potential for further optimization toward VOC and heavy-metal abatement. The novelty of this research lies in the innovative in situ growth of the ZIS-LDH coating, which ensures robust interfacial bonding with the cement substrate, enhancing both photocatalytic efficiency and long-term durability in real-world applications.

Graphical Abstract