Properties and mechanism for selective adsorption of Au(iii) on an ionic liquid adsorbent by grafting N-methyl imidazole onto chloromethylated polystyrene beads |
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Authors: | Xin Kou Bowen Ma Rui Zhang Miaomiao Cai Yong Huang Ying Yang |
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Institution: | The Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 P. R. China, |
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Abstract: | To recover Au(iii) from an acidic chloride-containing solution efficiently, an ionic liquid absorbent (CMPS-IL) was synthesized by grafting N-methyl imidazole onto chloromethylated polystyrene beads (CMPS). The adsorption capacity, selectivity, and reusability were systematically evaluated by a series of adsorption experiments. The maximum adsorption capacity reached up to 516.5 mg g−1 at 318 K. The adsorbent can selectively recover Au(iii) from binary system solutions with a higher separation factor βAu/M (104–106). Moreover, the adsorption–desorption cycles (7 cycles) showed that the CMPS-IL maintained a stable adsorption performance and high adsorption efficiency. Finally, the adsorption mechanism of CMPS-IL for Au(iii) was investigated by SEM, TEM, XPS, and FT-IR, then proposed with a combination of electrostatic interactions and d–π interaction between imidazolium and AuCl4−. This study provides an easily-prepared and economical adsorbent for Au(iii) with high selectivity and large adsorption capacity to boost its practical applications.The synthesis and adsorption properties for Au(iii) of CMPS-IL synthesized by grafting N-methyl imidazole onto chloromethylated polystyrene beads (CMPS). |
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