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Gui W.,Lanzhou University | Zhu X.,Lanzhou University | Yang Y.,Lanzhou University | Yang Y.,Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
RSC Advances | Year: 2016

Hydrophilic ionic liquid (imidazolium chloride, imCl)-polyvinyl chloride ionomer (imCl-PVC) as a green sorbent to recover precious gold from acidic chloride solution was characterized by SEM, FTIR, XPS and NMR. Potential rate controlling steps of the adsorption process are modeled by the best-fit of the kinetic curve (pseudo-second-order), and isotherm (Langmuir) parameters. The wide range of pH (1-6), competing heavy metals (Cu, Cd, Co, Cr, Ni, and Mn) and the high Cl- concentration showed least interference. The results of XPS analysis showed that the Au(iii) ion sorption was an electrostatic attraction-reduction process. Moreover, a stripping agent (thiourea) desorbed 88% of ionic gold. The spent adsorbent could be regenerated well and retained above 64% of the recovery efficiency at the end of the fifth cycle. The performance characteristics of imCl-PVC to enrich gold can be applied in the treatment of gold-contaminated water. © 2016 The Royal Society of Chemistry. Source


Liu M.,Lanzhou University | Yin H.,Lanzhou University | Yang Y.,Lanzhou University | Yang Y.,Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province | And 2 more authors.
Journal of Applied Polymer Science | Year: 2013

Copolymers of aniline-g-poly(styrene-co-maleic anhydride) (AP/SMA) and its lanthanide(III) (Ln) ion complexes [Ln-AP/SMA (where Ln = La, Eu, Tb, or Yb)] were synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy, 1H-NMR analysis, thermogravimetry-differential thermal analysis, and differential scanning calorimetry. At room temperature, the fluorescence spectra showed that the AP/SMA polymer had a strong, broad emission band at 300-550 nm (maximum wavelength = 381 nm) under excitation at 293 nm. Moreover, the respective characteristic emissions of Eu(III) and Tb(III) ions were observed in their Ln(III) complexes. Both the Eu(III) complexes and Tb(III) complexes showed excellent solvent resistance, good thermal stability, high quantum yield, and a long fluorescent lifetime. Therefore, the AP/SMA polymer and the fluorescent Ln-AP/SMA complexes have a promising future in applications of fluorescence materials. In addition, the reaction spontaneously reached equilibrium only after 5 min in the water phase; this showed that AP/SMA has good application prospects in the adsorption of Ln ions. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3432-3439, 2013 Copyright © 2013 Wiley Periodicals, Inc. Source


Li D.,Lanzhou University | Li D.,Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province | Chang X.,Lanzhou University | Chang X.,Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province | And 8 more authors.
Microchimica Acta | Year: 2011

A new sorbent was prepared by immobilization of 2,6-diaminopyridine on activated carbon and then used as a solid-phase extractant for trace Au(III), Pd(II) and Pt(IV) before their determination by ICP-AES. Effects of pH, the shaking time, the sample flow rate and volume, the elution condition and the potentially interfering ions were investigated. The optimum pH value is 1. The maximum static adsorption capacity for the three ions is 202.7, 38.5 and 30.1 mg g-1, respectively. The adsorbed metal ions can be completely eluted by 2 mL of the eluent solution that contains 0.05 mol L-1 HCl and 5% thiourea. Common other ions do not interfere. The detection limits (3σ) are 0.16, 0.33 and 0.29 ng mL-1, respectively. The relative standard deviation (RSD) was lower than 3.0% (n = 8). The new sorbent was applied to the preconcentration of the three ions in ore and rock samples with satisfactory results. [Figure not available: see fulltext.] © 2011 Springer-Verlag. Source

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