Details

Autor(en) / Beteiligte

• Wang, Fu-Chun
• Zhao, Jun-Mei
• Wang, Wan-Kun
• Tong, Zi-Zheng

Titel

Adsorption of Au(III) by amino-modified monodispersed PGMA microspheres and deposition of gold nanoparticles

Ist Teil von

• Rare metals, 2018-03, Vol.37 (3), p.196-203

Ort / Verlag

Beijing: Nonferrous Metals Society of China

Erscheinungsjahr

2018

Quelle

SpringerLink

Beschreibungen/Notizen

• Monodispersed poly(glycidyl methacrylate) (PGMA) microspheres with various amounts of amino groups (PGMA-NH 2 ) 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), thermogravimetry–differential scanning calorimetry (TG–DSC), scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) confirms that AuCl 4 − has been reduced to Au 0 nanoparticles and deposited onto the surface of PGMA-NH 2 . The current work shows a good prospect for PGMA-NH 2 to be a valid adsorbent for the recovery of gold and the possible fabrication of gold nanoparticles by reduction–deposition process without any reductant. Graphical Abstract