A Layered Chitosan/Graphene Oxide Sponge as Reusable Adsorbent for Removal of Heavy Metal Ions
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摘要:
Along with the growing severity of environment problem and energy crisis,it is inevitable to develop novel materials,which are contributed to the removal of hazardous pollutants from contaminated water.Herein,we reported a facile method for the preparation of free-standing chitosan/graphene oxide(CS/GO) composite sponges with low density,where CS/GO mixtures were first synthesized by the homogeneous reaction of chitosan and gra phene oxide in aqueous acetic acid solution;then CS/GO sponges were obtained by lyophilizing the suspension,which were prefrozen at-20 °C and in liquid nitrogen successively.The obtained layered sponge showed good water-driven shape memory effect and was a good adsorbent of Co2+ and Ni2+ with a large adsorption capacity of 224.8 and 423.7 mg/g,respectively.Importantly,the successive adsorption-desorption studies employing CS/GO sponge indicated that the composite could be regenerated by HCl solution and reused in more than five cycles with regeneration efficiency beyond 80%.Also,the resultant sponge was explored as an exceptionally adsorbent for the removal of organic dye(e.g.,methylene blue,MB).