Surface modification of cellulose microsphere with imidazolium-based ionic liquid as adsorbent: effect of anion variation on adsorption ability towards Au(III)
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A series of cellulose functionalized with imidazolium-based ionic liquid as adsorbents (Resin-Xs) bearing various encountered anions were newly synthesized by grafting glycidyl methacrylate onto cellulose microspheres followed by reaction with different ionic liquids 1-aminopropyl-3-methyl imidazolium salt. FTIR and XPS confirmed successful covalent immobilization of ionic liquids onto cellulose microspheres. The adsorption behaviors of Resin-Xs towards Au(III) were investigated as function of pH, contact time, metal ion concentration and temperature. The Resin-Xs exhibited excellent adsorption ability towards Au(III). Their maximum adsorption capacities obtained by Langmuir model were ranging 454.4–735.3 mg/g. Adsorption equilibrium could be achieved within 2 h, and the kinetics data were better fitted to pseudo-first-order model. Besides, it was indicated that encountered anion (X) had significant effect on their adsorption capacity with order of NO3− > NTf 2 − ≈ Br− > Cl− > BF4−, which was due to the fact that radius, hydrophilicity together with coordination ability of anions affected adsorption mechanism and thus determined adsorption ability. The results suggested that Resin-Xs were suitable materials for highly efficient and fast recovery of gold from aqueous solutions.
KeywordsCellulose modification Ionic liquid functionalization Gold recovery Anion effect Adsorption ability
This work was supported by the National Natural Science Foundation of China (11475112).
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