Self-assembly membrane of chitosan anchoring quinolince-2-one-3-carbaldehyde dihydrorhodizidine for highly effective adsorption of copper ion: experimental and theoretical study

Copper is one transition metal element, which plays important roles in nature and living organisms. Especially, when copper in the industrial process is released into biological chain, it can pose heavy metal pollution and seriously endangers human health. Recently, membrane materials for adsorbing Cu 2+ have received sufficient attention and made encouraging progress. However, due to the interference from some coexisting ions like Pb 2+ , Cd 2+ , Co 2+ , et al., how to achieve selective and efficient Cu 2+ adsorption holds certain research value. Herein, we synthesize a novel organic molecule based on quinolince-2-one-3-carbaldehyde dihydrorhodizidine (QDO), which contains active hydrogen atoms and heteroatoms. According to self-assembly interaction with important biological carrier chitosan, an adsorption membrane containing a large number of nano particles is constructed. By taking advantage of the rapid Cu 2+ binding property of organic molecules, the membrane can efficiently and quickly adsorb Cu 2+ in water solution. At pH = 6.5, the adsorption reaches equilibrium state within 150 min, and according to following the thermodynamics and kinetics model, maximum adsorption capacities of 214.4763 mg/g for Cu 2+ are confirmed. We conclude the adsorption process is primarily governed by homogeneous chemisorption. The absorption membrane provides potentially promising prospects for highly selective and effective Cu 2+ treatment.