首页|Selective and sensitive adsorption of Au(III) by poly-N-phenylglycine
Selective and sensitive adsorption of Au(III) by poly-N-phenylglycine
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NSTL
Elsevier
The sustainable utilization of metal resources and the imbalance between supply and demand for metals urgently require the recovery of metals from e-waste, which is considered an "urban mine. " In this study, poly-N-phenylglycine (PNPG) particles were firstly used to capture gold with adsorption capacity (1356.78 mg.g(-1)) and good sensitivity to Au(III) in low-concentration solutions at pH 1. The mechanism of Au(III) adsorption by PNPG mainly involved chemisorption and monolayer adsorption, as evidenced by the well-fitting pseudo-second-order model and Langmuir isotherm model. Electrostatic interactions and redox reactions occurred during adsorption, as characterized by zeta potential, XRD, TEM, FT-IR, and XPS. To solve the problem of removing the adsorbent after adsorption, the PNPG membrane was prepared in advance by vacuum filtration, and corresponding stability test experiments were conducted. SEM characterization revealed that the support layer did not participate in the adsorption process. The PNPG membrane remained active for a minimum of three cycles and could selectively capture Au(III) from uneven-concentration polymetallic solutions. Approximately 80% of the gold in the leaching solution of waste printed circuit boards of computers was selectively recovered using the prepared 2-mg PNPG membrane, proving the practical application of PNPG membranes for the recovery of gold from e-waste.
NSTL
Elsevier
