环境材料与生态化学研究发展中心知识库

A series of magnetic porous microspheres were prepared via (O₁/W)/O₂ double emulsion by grafting acrylic acid (AA) chains onto the backbone of hydroxyl propyl cellulose (HPC). The silane modified Fe₃O₄ particles and the surfactant polyglycerol polyricinoleate (PGPR) were used to stabilize the internal O₁/W Pickering emulsion and the (O₁/W)/O₂ double emulsion, respectively. The results indicated that the magnetic microspheres with the mean diameter about of 10 μm had interconnected pore structure and the subsequent adsorption experiments demonstrated that the as-prepared magnetic porous microspheres showed the fast adsorption kinetics for removal of Cu²⁺ and Pb²⁺, and the adsorption equilibrium can be achieved within 3 min for Cu²⁺ and 5 min for Pb²⁺ regardless of higher (400 mg/l) or lower (100 mg/l) initial concentrations. Additionally, the high adsorption capacity with 227.34 mg/g for Cu²⁺ and 476.85 mg/g for Pb²⁺ and the excellent reusability by in situ magnetic separation were also presented. Therefore, the magnetic porous microspheres can be applied as a potential recyclable material for highly efficient removal of heavy metals.