Adsorption performance and mechanism analysis of modified metal-organic frame composites towards methamphetamine

Abstract

A new adsorbent(DES@ZIF@MG) was prepared by grafting deep eutectic solvents(DES) onto metal organic framework ZIF/magnetic reduced graphene oxide(MG) for the adsorption of methamphetamine. A series of structural characterization analyses (SEM, FT-IR, BET, VSM, TGA) were facilitated to explore the microscopic morphology and physicochemical properties of DES@ZIF@MG. The adsorption performances of methamphetamine onto the adsorbent were investigated by adsorption kinetics, isotherms, and adsorption effect experiments(pH, ionic strengths, and humic acid). The results showed that the adsorption of methamphetamine onto DES@ZIF@MG was consistent with the pseudo-second-order model and the Langmuir model, indicating that the adsorption process was an energetically homogeneous adsorption dominated by chemisorption. The XPS characterization illustrated that the adsorption process of methamphetamine by DES@ZIF@MG mainly involved hydrogen bonding, π-π interaction, electrostatic interaction, and chelation.

Keywords

• adsorption
• deep eutectic solvents
• metal-organic framework
• methamphetamine