Fabrication of hierarchically porous NH2-MIL-53/wood-carbon hybrid membrane for highly effective and selective sequestration of Pb2

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2020-05, Vol.387, p.124141, Article 124141
• Main Authors: Gu, Yue, Wang, Yongchuang, Li, Huaimeng, Qin, Wenxiu, Zhang, Haimin, Wang, Guozhong, Zhang, Yunxia, Zhao, Huijun
• Format: Article
• Language: English
• Subjects: Continuous-flow; Hybrid membrane; NH2-MIL-53/WC; Pb2; Selective adsorption
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.124141

[Display omitted] •Cuboid-like NH2-MIL-53 crystals were in-situ immobilized on wood-carbon substrate.•The NH2-MIL-53/WC composite were utilized as filter membrane for Pb2+ removal.•Highly effective and selective sequestration of Pb2+ were achieved.•Sorption mechanism of Pb2+ on the NH2-MIL-53/WC composite was studied. Designing the desirable architecture for highly efficient sequestration of heavy metal ions is of paramount importance to ensure water safety. Herein, highly dense cuboid-like NH2-MIL-53 crystals have been in-situ immobilized on porous wood-carbon (WC) substrate (denoted as NH2-MIL-53/WC) based on a self-sacrificial template strategy. Benefiting from the perfect integration of unique 3D hierarchical pore structures, abundant binding sites, and specific sorption affinity of amino functional groups in NH2-MIL-53 toward Pb2+, the resulting NH2-MIL-53/WC hybrid membrane exhibits exceptional Pb2+ decontamination capability in terms of high uptake capacity, fast removal kinetics and superior selectivity in the presence of competing ions. Meanwhile, the macroscopic-sized monolithic shape is competent for facile separation, overcoming the inherent limitations of conventional nanosorbents. Furthermore, the as-fabricated monolithic membrane can be further assembled into a home-made filter system for continuous-flow wastewater purification, accompanied by an efficient treatment capacity of 2200 kg wastewater (spiked with 10 ppm Pb2+) per kg sorbent, while restricting the Pb2+ level in the effluent below the World Health Organization (WHO) limit (10 ppb). Such intriguing Pb2+ sequestration performance in both static and flowing states render the proposed NH2-MIL-53/WC hybrid membrane to hold huge prospects for the practical wastewater remediation.