[Figure 3] (IMAGE)
Caption
Applicability of the ALPF adsorbent for Au recovery processes. (a) Adsorption selectivity of the ALPF for Au(III) in the presence of coexisting metal ions including Cu(II), Pb(II), Cd(II), Mn(II), Ni(II), Co(II), Fe(II), Al(III), Cr(III), Zn(II), Na(I), K(I), Mg(II), and Ca(II). Ci of Au(III) was set to 10 mg/L, and those of other metal ions were set to 10, 100, and 1000 mg/L. Solution pH was adjusted to 1. (b) Purity of the recovered Au(0) by the ALPF. Inset shows an optical microscope image of the recovered Au(0). (c) Repetitive adsorption/desorption test of Au(III) using the ALPF adsorbent. Ci of Au(III) was set to 10 mg/L. Adsorption process was conducted for 24 h. Solution pH was adjusted to 1. Desorption process was conducted for 24 h using 0.5 acidic thiourea solution in 1.0 M HCl. (d) Deconvoluted HRXPS spectra of the ALPF for N 1s, showing the chemical change for amine groups of the ALPF adsorbent during the repetitive adsorption-desorption cycles. (e) Photograph of felts consisting of PANF (top) and ALPF (bottom), indicating that the fibrous adsorbent can be transformed into a desired shape. Scale bar is 2 cm. (f) Effect of the adsorbent shapes on the pressure drop in a column filled with the adsorbents. Each pressure drop in the column filled with the adsorbents was measured according to the volumetric flow rate
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Korea Institute of Science and Technology
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