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Adsorption of Au(Ⅲ) by amino-modified monodispersed PGMA microspheres and deposition of gold nanoparticles 被引量:3
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作者 Fu-Chun Wang Jun-Mei Zhao +1 位作者 Wan-Kun Wang Zi-Zheng Tong 《Rare Metals》 SCIE EI CAS CSCD 2018年第3期196-203,共8页
Monodispersed poly(glycidyl methacrylate)(PGMA) microspheres with various amounts of amino groups(PGMA-NH2) were used to adsorb Au(Ⅲ) from simulated wastewaters. Gold nanoparticle-coated PGMA functional micro... Monodispersed poly(glycidyl methacrylate)(PGMA) microspheres with various amounts of amino groups(PGMA-NH2) were used to adsorb Au(Ⅲ) from simulated wastewaters. Gold nanoparticle-coated PGMA functional microspheres can be directly obtained via the adsorption process. The adsorption kinetics follows pseudo-second model, and 10 min is enough for reaching at equilibrium. The adsorption isotherm follows Langmuir model, and the adsorption amounts for Au(Ⅲ) are 8.25 and 21.75 mol·kg^-1 at 298 and 328 K, respectively. The relative separation coefficients between Au(Ⅲ), Pt(Ⅵ), Pd(Ⅱ)and Co(Ⅱ), Cu(Ⅱ); Ni(Ⅱ), Fe(Ⅲ) are all higher than 100 when 1 〈 pH 〈 3. Furthermore, the characterization analysis of X-ray diffraction(XRD), thermogravimetrydifferential scanning calorimetry(TG-DSC), scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS), transmission electron microscopy(TEM) and Fourier transform infrared spectroscopy(FTIR) confirms that AuCl4^-has been reduced to Au^0 nanoparticles and deposited onto the surface of PGMA-NH2. The current work shows a good prospect for PGMA-NH2 to be a valid adsorbent for the recovery of gold and the possible fabrication of gold nanoparticles by reduction-deposition process without any reductant. 展开更多
关键词 PGMA microspheres AuCl4^- amino groups Adsorption Reduction-deposition Elemental gold
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