| Water pollution has aroused scientists’ great attention to the study on efficiency improvement of wastewater treatment by adsorbent, especially for the removal of heavy metal ions. Adsorbent chelates with metal ions with the formation of coordinate bond,which is one of the most efficient ways to remove metal ions in the wastewater. And chitosan is one of the potential biosorbents for wastewater disposal.Nanofiber has many remarkable characteristics, such as large specific surface area,high porosity, etc. These excellent properties play a crucial role for chitosan in maintaining its adsorption capacity. However, there are many significant obstacles to the electrospinning of chitosan, which is mainly dissolved in acidic solution. A good way to make chitosan-based composite nanofibrous membrane is that blending chitosan with excellent fiber-forming polymers for co-electrospinning.Chitosan/polymethylmethacrylate(PMMA) composite nanofibrous membrane can be made through electrospinning technique. During the static adsorption process, when the weight ration of chitosan and PMMA is 0.3:1.0, the maximum adsorption capacity(67.0mg·g-1) of composite nanofibers membrane is three times higher than that of chitosan powder(22.9 mg·g-1). The composite nanofibrous membrane exhibited an increasing adsorption capacity for Cr(VI) after filtration, 92.5 mg·g-1at p H 3.0.Electrospun chitosan/PA6 composite nanofibrous membrane was used to remove Cr(VI) in aqueous solution. The maximum Cr(VI) adsorption capacity of composite nanofibrous membrane after filtration(114.7 mg·g-1) was much higher than that of static adsorption(81.7 mg·g-1) and dynamic adsorption(80.7 mg·g-1), and the membrane desorbed by H2SO4 can be well reinstated and reused.Porous chitosan fibrous membranes were obtained through electrospinning of chitosan/synthetic polymer composite nanofibrous membrane and dissolving by appropriate solvent. The adsorption capacity is above 90 mg·g-1 for Cr(VI) ion. |
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