Zr-MOFs loaded on polyurethane foam by polydopamine for enhanced dye adsorption

• 作者: Jingjing Zhao Linqiong Xu Yaozhuo Su Hongwei Yu Hui Liu Shaoping Qian Wenge Zheng Yongqing Zhao
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 177-188
• 页数: 12页
• 语种: 英文

摘要

Zirconium-based metal-organic frameworks(Zr-MOFs)have attracted widespread attention due to their high specific surface area,high porosity,abundant metal active sites and excel-lent hydrothermal stability.However,Zr-MOFs materials are mostly powdery in nature and thus difficult to separate from aqueous media,which limits their application in wastew-ater treatment.In this study,PDA/Zr-MOFs/PU foam was constructed by growing Zr-MOFs nanoparticles on a dopamine-modified polyurethane foam substrate by in-situ hydrother-mal synthesis as an adsorbent for removing dyes from wastewater.The results demon-strated that the polydopamine coating improves the dispersion of the Zr-MOFs nanoparti-cles on the substrate and enhances the interaction between the Zr-MOFs nanoparticles and the PU foam substrate.As a result,compared with Zr-MOFs/PU foam,the prepared PDA/Zr-MOFs/PU foam exhibits higher adsorption capacity for crystal violet(CV)(63.38 mg/g)and rhodamine B(RB)(67.73 mg/g),with maximum adsorption efficiencies of CV and RB of 98.4％(pH=11)and 93.5％(pH=7),respectively,at a concentration of 10 mg/L.The PDA/Zr-MOFs/PU foam can simultaneously remove CV and RB from the mixed solution.Moreover,the PDA/Zr-MOFs/PU foam still exhibits high stability and reusability after five cycles.