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Comparison of results of Au-198 (top) gamma spectrum pattern with background (bottom).
Source publication
The residual waste of synthesis and use of radioactive elements of gold ¹⁹⁸ Au as a radiopharmaceutical and tracer after decaying can be reused as an irradiated target material. The gold recovery process was carried out on Au-198 radioactive nano gold waste with the redox replacement method using Zn-foil as metal reducing agent. Radioactive Au-gold...
Contexts in source publication
Context 1
... the emission of radiation from the sample solution is measured using a gamma spectrometer to determine the level of activity and types of radionuclides contained in waste [14,15]. In order to see that radioactive substances from the waste have been safely used, the results are compared to the pattern of gamma radiation spectrum of background shown in Figure 1. Figure 1 shows that there is no radioactivity indicated by the absence of the peak of the golden isotope Au-198 in the 412 KeV gamma energy. ...
Context 2
... order to see that radioactive substances from the waste have been safely used, the results are compared to the pattern of gamma radiation spectrum of background shown in Figure 1. Figure 1 shows that there is no radioactivity indicated by the absence of the peak of the golden isotope Au-198 in the 412 KeV gamma energy. This indicates that the gold radioactivity was too low to interfere with the characterization of the sample. ...
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Citations
... The method is particularly helpful in examining extraction parameters such as the extraction coefficient and equilibrium time. Such parameters can be determined using radioactive isotope 198 Au [136]. An aqueous solution (aqua regia containing Au) was labelled with 198 Au, while diethyl malonate was utilized as an extractant. ...
The extraction of useful minerals or geological materials from the Earth’s crust, most typically from various sources, is crucial to a country’s development and progress. Mineral-rich countries use these resources to transform their economies and propel them toward long-term prosperity. There is an urgent need for the world to increase mineral exploration efforts, improve the recycling of important metal-containing resources, and extract them using upgraded hydrometallurgical procedures with high recovery efficiency. This review paper highlights the importance of strategic and critical metals in the economy and the role of nuclear techniques in the analysis, process optimization, and remediation of metals using solvent extraction, adsorption, and chromatographic resins. Radiotracer analysis, X-Ray Fluorescence spectrometry (XRF), Neutron Activation Analysis (NAA), and X-Ray Diffraction (XRD) are appropriate for improving laboratory-based hydrometallurgical processes, with future technical and economic benefits. The development and installation of novel instruments to provide the real-time control of mining and mineral processing plants for improved control have the potential to aid in the recovery of a broad range of metals.
The recovery of valuable gold from wastewater is of great interest because of the widespread use of the precious metal in various fields and the pollution generated by gold-containing wastes in water. In this paper, a water-insoluble cross-linked adsorbent material (TE) based on cyanuric chloride (TCT) and ethylenediamine (EDA) was designed and used for the adsorption of Au(III) from wastewater. It was found that TE showed extremely high selectivity (D = 49,213.46) and adsorption capacity (256.19 mg/g) for Au(III) under acidic conditions. The adsorption rate remained above 90% eVen after five adsorption–desorption cycles. The adsorption process followed the pseudo-first-order kinetic model and the Freundlich isotherm model, suggesting that physical adsorption with a multilayer molecular overlay dominates. Meanwhile, the adsorption mechanism was obtained by DFT calculation and XPS analysis, and the adsorption mechanism was mainly the electrostatic interaction and electron transfer between the protonated N atoms in the adsorbent (TE) and AuCl4−, which resulted in the redox reaction. The whole adsorption process was the result of the simultaneous action of physical and chemical adsorption. In conclusion, the adsorbent material TE shows great potential for gold adsorption and recovery.
