Preparation of CuxS nanocluster magnetic adsorbent and its Hg2+adsorption performance and mechanism
Wastewater containing Hg2+emitted from coal combustion,non-ferrous metallurgy and other industries poses a serious threat to human health and ecosystems.CuxS/PDA@Fe3O4 magnetic nano-adsorbent was developed for effiicient and sustainable removal of Hg2+from wastewater.By modifying Fe3O4 nanoparticles with polydopamine(PDA)and firmly anchoring CuxS nanoclusters onto the positively charged PDA@Fe3O4 surface through liquid-phase chemical deposition,a type of CuxS/PDA@Fe3O4 magnetic nano-adsorbent with stable structure is synthesized.Within 120 minutes,the adsorbent can achieve a Hg2+adsorption capacity of 1 394.61 mg·g-1,and also maintains high selectivity for Hg2+in complex environments.Optimization studies reveal the optimal preparation conditions are following:CuCl2 dosage of 0.04 mol·L-1,the synthesis temperature of 20℃,and pH 3.0.Desorption and regeneration of the adsorbent are successfully achieved using HC1 solution,demonstrating its excellent recyclability.Furthermore,the magnetic property of the adsorbent facilitates the rapid separation and recovery after adsorption.The adsorbent can be prepared with low cost,simple and efficient process,and has a promising application in mercury pollution control and heavy metal wastewater treatment.
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