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Biosorbents from Mangifera indica L. Peel for the Recovery of Gold from Electronic Waste
 
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1
Department of Environmental Science, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
2
Department of Chemistry, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
CORRESPONDING AUTHOR
Cesar V. Ortinero   

Department of Environmental Science, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
Publication date: 2022-05-01
 
J. Ecol. Eng. 2022; 23(5):102–108
 
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ABSTRACT
Mango (Mangifera indica L.) peel, a food processing waste, is rich in polyphenols and polysaccharides, two substances that have previously been linked in the selective recovery of gold from metals solution. This study was carried out to develop biosorbents from green and ripe mango peel for the retrieval of gold from electronic waste (e-waste). Biosorbents were produced by cross-linking the components of mango peel through acid treatment. The gold from the mixture of metals leached from the e-waste were recovered using the cross-linked and untreated mango peel. Fourier transform infrared (FTIR) spectroscopy was employed to confirm cross-linking and to monitor the adsorption of gold. Scanning electron microscopy (SEM) was performed to characterize the surface of the biosorbents. Incineration was conducted to separate gold from the biosorbent. The results of the FTIR analysis revealed an increase in the intensity of the peak for C=O and the appearance of the signal for C-O-C, suggesting cross-linking. The FTIR spectra of the untreated and cross-linked biosorbents also showed more intense peak for C=O, which may be due to the oxidation of OH groups as gold ions are reduced. The SEM revealed increase in the roughness of the surface of the biosorbents, presumably as the result of gold deposition. Although all biosorbents were able to capture gold from the leachate, the cross-linked green mango peel appeared to be the most effective.