| Title |
Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer |
| ID_Doc |
14699 |
| Authors |
Preetam, A; Modak, A; Naik, SN; Pant, KK; Kumar, V |
| Title |
Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer |
| Year |
2024 |
| Published |
Acs Applied Polymer Materials, 6, 7 |
| DOI |
10.1021/acsapm.3c02740 |
| Abstract |
Recovering gold from electronics waste (e-waste) is essential for conserving valuable resources and reducing improper disposal's environmental impact. However, the selective recovery of gold from e-waste is a significant challenge due to its heterogeneous nature and existing inappropriate recovering processes. Considering these issues, in this study, we investigated a promising approach for recovering gold from waste random access memory (WRAM). For that, we synthesized a porous nanonet polymer (Por-net) through a one-pot Friedel-Crafts polymerization method containing multiple functional groups, i.e., porphyrin and triphenylamine, within a single framework material, acting as a bifunctional chelating ligand. The adsorption results were significantly influenced by the pH conditions. Around 1250 mg g(-1) capacity of Au was recovered under realistic experimental conditions in an acidic medium. Moreover, the adsorption isotherm and kinetic study revealed the Langmuir model and pseudo-second-order kinetic fittings for the Au adsorption on Por-net. Properties such as the high surface area and structure of Por-net as well as the Au@Por-net polymer were comprehensively characterized by X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), thermogravimetric analysis (TGA), solid-state( 13)C cross-polarization magic angle spinning (CP-MAS) NMR, N2 sorption analysis field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), ultraviolet (UV)-visible, time-resolved photoluminescence, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The results showed its efficient potential for recovering gold from real e-waste sources. Por-net showed excellent desorption efficiency, recyclability, selectivity, and chemical stability. At last, the economic feasibility of Por-net for the purpose of recovering gold from e-waste is also explored. The present work represents a greener and feasible approach to promoting sustainable development, circular economy, and responsible waste management using an effective porous polymer as a scaffold. |
| Author Keywords |
electronic waste; functional polymers; adsorptioncapacity; kinetics; Au recovery; greenerapproach |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001187646500001 |
| WoS Category |
Materials Science, Multidisciplinary; Polymer Science |
| Research Area |
Materials Science; Polymer Science |
| PDF |
|