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Mihăilescu M, Negrea A, Ciopec M, et al. Full Factorial Design for Gold Recovery from Industrial Solutions. Toxics. 2021;9(5)doi: 10.3390/toxics9050111.
Mihăilescu, M., Negrea, A., Ciopec, M., Negrea, P., Duțeanu, N., Grozav, I., Svera, P., Vancea, C., Bărbulescu, A., & Dumitriu, C. �. �. (2021). Full Factorial Design for Gold Recovery from Industrial Solutions. Toxics, 9(5), . https://doi.org/10.3390/toxics9050111
Mihăilescu, Maria, et al. "Full Factorial Design for Gold Recovery from Industrial Solutions." Toxics vol. 9,5 (2021). doi: https://doi.org/10.3390/toxics9050111
Mihăilescu M, Negrea A, Ciopec M, Negrea P, Duțeanu N, Grozav I, Svera P, Vancea C, Bărbulescu A, Dumitriu CȘ. Full Factorial Design for Gold Recovery from Industrial Solutions. Toxics. 2021 May 20;9(5). doi: 10.3390/toxics9050111. PMID: 34065249; PMCID: PMC8160989.
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Toxics. 2021 May 20;9(5). doi: 10.3390/toxics9050111.

Full Factorial Design for Gold Recovery from Industrial Solutions.

Toxics

Maria Mihăilescu, Adina Negrea, Mihaela Ciopec, Petru Negrea, Narcis Duțeanu, Ion Grozav, Paula Svera, Cosmin Vancea, Alina Bărbulescu, Cristian Ștefan Dumitriu

Affiliations

  1. Research Institute for Renewable Energies, Politehnica University Timi?oara, 2, P-?a Victoriei, 300006 Timi?oara, Romania.
  2. Faculty of Industrial Chemistry and Environmental Enginering, Politehnica University Timi?oara, 2, P-?a Victoriei, 300006 Timi?oara, Romania.
  3. National Institute for Research-Development for Electrochemistry and Condensate Matter, 114, Dr. A. P?unescu Podeanu Str., 300224 Timi?oara, Romania.
  4. Department of Civil Engineering, Transilvania University of Bra?ov, 5 Turnului Str., 900152 Bra?ov, Romania.
  5. SC Utilnavorep SA, Constan?a, 55, Aurel Vlaicu Bd, 90055 Constan?a, Romania.

PMID: 34065249 PMCID: PMC8160989 DOI: 10.3390/toxics9050111

Abstract

Gold is one of the precious metals with multiple uses, whose deposits are much smaller than the global production needs. Therefore, extracting maximum gold quantities from industrial diluted solutions is a must. Am-L-GA is a new material, obtained by an Amberlite XAD7-type commercial resin, functionalized through saturation with L-glutamic acid, whose adsorption capacity has been proved to be higher than those of other materials utilized for gold adsorption. In this context, this article presents the results of a factorial design experiment for optimizing the gold recovery from residual solutions resulting from the electronics industry using Am-L-GA. Firstly, the material was characterized using atomic force microscopy (AFM), to emphasize the material's characteristics, essential for the adsorption quality. Then, the study showed that among the parameters taken into account in the analysis (pH, temperature, initial gold concentration, and contact time), the initial gold concentration in the solution plays a determinant role in the removal process and the contact time has a slightly positive effect, whereas the pH and temperature do not influence the adsorption capacity. The maximum adsorption capacity of 29.27 mg/L was obtained by optimizing the adsorption process, with the control factors having the following values: contact time ~106 min, initial Au(III) concentration of ~164 mg/L, pH = 4, and temperature of 25 °C. It is highlighted that the factorial design method is an excellent instrument to determine the effects of different factors influencing the adsorption process. The method can be applied for any adsorption process if it is necessary to reduce the number of experiments, to diminish the resources or time consumption, or for expanding the investigation domain above the experimental limits.

Keywords: Am-L-GA; Amberlite XAD7; L-glutamic acid; factorial design

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