三维多孔弹性体吸附剂的制备及其高效去除染料特性

Developing an efficient adsorbent is of great importance for wastewater treatment. Despite many examples for their synthesis exist, it still remains a challenge to fabricate a versatile adsorbent to overcome the defects of their common forms (e.g., powder, pellet, bead and flake). Herein, a novel three-dimensional porous elastic adsorbent (3D-PE) was constructed by adhering porous carbon to polyurethane foam framework using ethylene-vinyl acetate copolymer. 3D-PE was characterized by scanning electron microscope (SEM), gas adsorption analyzer, electronic universal testing machine and UVVis spectrophotometer. Benefitting from the rational integration of the porous carbon, ethylene-vinyl acetate copolymer and polyurethane foam, 3D-PE exhibited high strength, excellent resilience and remarkable flexibility even under compression conditions. Inspired by these impressive characteristics, 3D-PE was potentially used as an adsorbent for wastewater purification， especially in a feasible application to be operated under harsh conditions. As a proof of concept, when the adsorbents were used towards methylene blue removal, 3D-PE exhibited high adsorption rate (96% removal efficiency within 5 min), stable recyclability even under a repeatedly compressed condition. In addition, kinetics and isotherm models were fitted. It was confirmed that the adsorption of methylene blue by 3D-PE was chemisorption and multi-molecular layer adsorption. 3D-PE may hold good promising applications in wastewater remediation, catalytic reactions, and environmental engineering.