Research Article

Fast and Selective Adsorption of Au (III) from the Waste Printed Circuit Boards Using a Low-Cost Adsorbent: Optimization by Central Composite Design Based on Response Surface Methodology

Figure 3

EDS-mapping of the GA before loading Au (III) (a, b) and after loading Au (III) (c, d) on it.
(a)
(b)
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(d)