Synthesis Optimization of UiO-66(Zr)/Sodium Alginate Composite Microspheres and Its Removal of As(V) in Water
MA Hui1,2, FANG Yue1,2, WU Yi’nan1,2,*, LI Fengting1,2
1 State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China 2 Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
Abstract: In this work,the synthesis of metal-organic framework UiO-66(Zr)/solidum alginate(SA) composite microspheres and its adsorptive removal of As(V) from water were reported. The effects of the addition of UiO-66(Zr) powder and the drying method of the aerogel microspheres on the shaping structure and adsorption performances were comprehensively investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen sorption and adsorption test. UiO-66(Zr)/SA microspheres with the optimal physicochemical properties were obtained by mixing 50wt% powdery UiO-66(Zr), followed by flash freezing dry method. Their adsorption behaviors over As(V) were further explored and compared with a commercial arsenic removal material MN. The results indicate that, the maximum adsorption capacity of the microspheres (18.65 mg/g) is achieved at pH=7.0 with an initial As(V) concentration of 20 mg/L under static adsoption conditon. The results of breakthrough experiment show that the microspheres material containing 1.0 g UiO-66(Zr) can treat at least 1.2 L solution with the As(V) concentration of 100 μg/L, ensuring the effluent concentration below 10 μg/L. The overall performance of UiO-66(Zr)/SA microspheres was superior to MN. Considering the showcase of green and low-cost batch preparation of UiO-66(Zr) reported by the author’s team recently, the UiO-66(Zr)/SA microspheres can be used as a potential sorbent for the deep purification of As(V) in water.
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