离子印迹吸附微球微流控制备及DFT性能

In order to selectively remove targeted metal ions from complex metal ions contained wastewater, ionic imprinted chitosan microspheres were synthesized by combining with microfluidics and ion imprinting technologies. Its adsorption performance of as-prepared microspheres were systematically investigated by batch adsorption experiments and DFT molecular simulation to reveal the interaction mechanism and selective binding principle between as-prepared microspheres and targeted Cu ions. The results showed that under the optimized adsorption condition (initial Cu concentration: 400 mg/L, pH = 6) in a thermostatic shock state (35 ℃ and 160 r/min), the adsorption equilibrium can be achieved within 48 h with the maximum adsorbance of 117.76 mg/g for Cu ions. Besides, the adsorption kinetics and isotherms results were well fitted with pseudo-second order model and Langmuir model, respectively, which demonstrated that the adsorption process was a monolayer chemisorption process accompanied by electron transfer. Moreover, as-prepared microspheres exhibited rapid recognition and selective adsorption property towards targeted Cu ions in binary and/or ternary coexistence systems, which could be attributed to the ionic scale effect and higher electronegativity of Cu ion, as well as the stronger adsorption energy between the targeted Cu ion and the molecular monomers of as-prepared chitosan microspheres. It was concluded that the obtained research achievements could provide theoretical guidance for the development and optimization of new generation biosorbents with high efficiency performance.