Magnetic Fe₃O₄ nanoparticle/ZIF-8 composites for contaminant removal from water and enhanced flame retardancy of flexible polyurethane foams

• Main Authors: Xu, Zhoumei, Chu, Fukai, Luo, Xiaoyu, Jiang, Xin, Cheng, Liang, Song, Lei, Hou, Yanbei, Hu, Weizhao
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Mechanical engineering; Metal−Organic Framework; Fire Safety
• Online Access: https://hdl.handle.net/10356/162179
• Institution: Nanyang Technological University

In order to separate heavy-metal ions from contaminated wastewater and further realize the reutilization of waste adsorbent, magnetic composites with flowerlike structure were successfully synthesized. After the absorption of Cu2+ions, hybrids can be used as effective coatings to enhance the fire safety of flexible polyurethane foam (FPUF) through a dip-coating method. As-fabricated metal-organic framework (MOF)-based composites exhibited a core-shell and flowerlike structure with high thermal stability. The maximum adsorption capacity for Cu2+could reach 292.13 mg·g-1, calculated from the Langmuir isotherm model. In order to reutilize the adsorbed Cu2+ions, the CuO-loaded MOF-derived Fe3O4@ZnO@CuO (MO) was obtained with a simple heat treatment. The effectivity of MO as a fire-safety coating for inhibiting the release of heat and toxic gases of FPUF was satisfactory. The application of this MOF-based composite will provide useful insights into the design of bifunctional materials for efficient wastewater remediation and fire-safety coatings.