Highly Efficient Removal of VOCs at Low Concentrations by Low-Cost Biochar-Based Zr-MOF Adsorbents

作者：Shu-Huan Chen, Zhenxia Du, Huma Javeria, Muhammad Qamer Abbas, Afaq Nazir, Jehangir Khan · 发表于：Langmuir · 年份：2025 · DOI：10.1021/acs.langmuir.5c00851 · 被引用次数：7 · 研究领域：Catalytic Processes in Materials Science、Industrial Gas Emission Control、Gas Sensing Nanomaterials and Sensors

Despite the low concentrations of volatile organic compounds (VOCs) indoors, they still pose significant health concerns. Therefore, there is an urgent need to prepare adsorbents to remove low-concentration VOCs indoors. In this study, biochar-based MOF composites (UIO-66@PSB and UN-66@PSB) were efficaciously prepared and optimized by a straightforward one-pot method. After being optimized, UIO-66@PSB and UN-66@PSB were characterized by SEM-EDX, XRD, FTIR, XPS, and BET. Toluene and acetaldehyde, as typical indoor pollutants, were chosen as the adsorbates to examine the adsorption performances of UIO-66@PSB and UN-66@PSB adsorbents. The results demonstrated that both UIO-66@PSB and UN-66@PSB exhibited excellent adsorption ability for low-concentration toluene and acetaldehyde while retaining effective adsorption performance even under conditions of high humidity. The PSO model and the Freundlich model were effective in characterizing the adsorption characteristics of toluene, while the PSO model and the Langmuir model were similarly effective in characterizing the adsorption performance of acetaldehyde. Additionally, after 5 adsorption-desorption cycles, UIO-66@PSB and UN-66@PSB can still maintain good adsorption stability. The DFT results revealed that the π-π interaction plays a pivotal role in the adsorption of toluene, with the presence of an amino group shown to augment this phenomenon. Conversely, the electrostatic interaction emerges as the dominant force in the adsorpt...