Functionalized agriculture-derived biomass-based adsorbent for the continuous recovery of gold from a simulated mobile phone leachate

Nurul Rizki, Intan; Amalina, Ilma; Hasan, Nurul Sahida; Khusnun, Nur Farahain; Abdul Jalil, Aishah; Firmansyah, Mochamad Lutfi

doi:10.1016/j.chemosphere.2023.140455

Chemosphere

2023

DOI: 10.1016/j.chemosphere.2023.140455

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Functionalized agriculture-derived biomass-based adsorbent for the continuous recovery of gold from a simulated mobile phone leachate

Intan Nurul Rizki,

Ilma Amalina,

Nurul Sahida Hasan

et al.

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2024

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Cited by 3 publications

References 29 publications

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Recovery of precious metals from mobile phone waste: Studies on leaching and adsorption by functionalized activated carbon

Firmansyah,

Rizki,

Amalina

et al. 2024

Results in Engineering

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Recovery of precious metals from mobile phone waste: Studies on leaching and adsorption by functionalized activated carbon

Firmansyah,

Rizki,

Amalina

et al. 2024

Results in Engineering

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Computational Study of the Effect of the Size-Dependent Dielectric Functions of Gold Nanomaterials on Optical Properties

Mekuye,

Höfer,

Mebratie

2024

Advances in Condensed Matter Physics

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The effect of size on the optical properties of gold nanomaterials has been studied using the theoretical Drude–Sommerfield model. The real and imaginary parts of the dielectric function of bulk as a function of wavelength due to free electron contribution and the real and imaginary parts of the dielectric function of nanogold materials as a function of wavelength due to free electron and bond electron contribution are calculated. The real and imaginary parts of the dielectric function of bulk as a function of wavelength due to the free electron contribution graph and The real and imaginary parts of the dielectric function of nanogold materials as a function of wavelength due to free electron and bond electron contributions are plotted. As we observed from the graphs, the real dielectric functions of both bulk and nanogold materials are inversely proportional to wavelength. The imaginary part of the dielectric function of bulk gold materials is independent of wavelength. At high wavelengths, the size of the gold nanomaterial is highly influenced by both real and imagined dielectric functions at high waves. As the wavelength increases, the effect of the size on the dielectric function also increases. The size-dependent dielectric function of nanomaterials is highly influenced by their optical properties and electrical structure.

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Selective adsorption of gold ion in wastewater with competing cations by novel thiourea-reduced graphene oxide

Chen,

Chung,

Hsi

2024

Sustain Environ Res

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In this study, selective adsorption experiments of Au were carried out using graphene oxide (GO) and thiourea-reduced GO (TU-rGO). Adsorption experiments using Au, Cu, Pb, and Zn were performed with GO and TU-rGO in order to selectively adsorb Au from simulated waste electric and electronic equipment leachate or printed circuit board wastewater. Optimal adsorption conditions were determined, adsorption isotherm models were fitted, and desorption and regeneration experiments were performed. Additionally, GO and TU-rGO were characterized to better understand the material and propose the adsorption and desorption mechanisms for TU-rGO. It was found that TU-rGO could selectively adsorb Au, achieving a high efficiency of 95‒99% at initial Au concentrations of 0.1‒10 mg L−1 with little to no adsorption of Cu, Pb, and Zn. Moreover, the desorption efficiency of Au by ammonium thiosulfate reached 94% with the adsorption efficiency of TU-rGO decreasing from 99 to 78% after five adsorption and desorption cycles. Isotherm adsorption experiments indicated that the Langmuir model better fitted the adsorption of Au than the Freundlich model. This implied that the adsorption process was mainly controlled by monolayer coverage, with a high Au adsorption capacity of approximately 833 mg g−1 for TU-rGO.

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Functionalized agriculture-derived biomass-based adsorbent for the continuous recovery of gold from a simulated mobile phone leachate

Cited by 3 publications

References 29 publications

Recovery of precious metals from mobile phone waste: Studies on leaching and adsorption by functionalized activated carbon

Recovery of precious metals from mobile phone waste: Studies on leaching and adsorption by functionalized activated carbon

Computational Study of the Effect of the Size-Dependent Dielectric Functions of Gold Nanomaterials on Optical Properties

Selective adsorption of gold ion in wastewater with competing cations by novel thiourea-reduced graphene oxide

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