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Enhanced recovery of gold from aqua regia leachate of electronic waste using dithiocarbamate-modified cellulose

  • SPECIAL FEATURE: ORIGINAL ARTICLE
  • 9th 3R International Scientific Conference (9th 3RINCs 2023)
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Abstract

Electronic waste (e-waste) has emerged as a valuable secondary source of metals, including precious metals (PMs), surpassing those found in natural ores. The objective of this study is to explore the use of cellulose-based adsorbents, specifically dithiocarbamate-modified cellulose (DMC) and proline-incorporated DMC with epoxy-cross-linkage (DMC-Pro-Epo6), in the recovery of Au from e-waste, particularly under harsh aqua regia (AR) conditions. DMC adsorption behavior in AR is influenced by several factors, such as AR dilution, pre-adsorption phenomena, contact time, and AuIII concentration. DMCs displayed competitive adsorption across varied AR dilutions, benefiting from diluted AR due to hindered adsorption in undiluted AR. Contact time analysis demonstrated rapid AuIII adsorption, with equilibrium achieved in approximately 30 min. Four anion exchange-type commercial resins (Lewatit MonoPlus TP 214, Diaion WA30, Dowex 1X8, and AmberChrom 1X8) and one chelating CR (Q-10R) were tested for comparison, and their adsorption capacities were evaluated. Both the DMC and DMC-Pro-Epo6 have higher adsorption capacities for AuIII than commercial resins, which can be attributed to their sorption-active dithiocarbamate functional groups. The study also outlined a step-by-step Au extraction from printed circuit boards (PCBs), and the effective recovery of metallic Au from PCBs using DMCs was demonstrated.

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Acknowledgements

The Japan Society for the Promotion of Science (JSPS) provided financial support for this study through the Grants-in-Aid for Scientific Research (Grant Nos. 21H03632 and 21K12287).

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Authors and Affiliations

  1. Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan

    M. Mehedi Hasan Rocky, Yuto Sakai & Shafiqur Rahman

  2. Department of Natural Science, Port City International University, South Khulshi, Chattogram, 4225, Bangladesh

    M. Mehedi Hasan Rocky

  3. Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima, 960-1296, Japan

    Ismail M. M. Rahman

  4. Department of Chemistry, Faculty of Science, University of Chittagong, Chattogram, 4331, Bangladesh

    Foni B. Biswas

  5. Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan

    Masaru Endo, Kuo H. Wong, Asami S. Mashio & Hiroshi Hasegawa

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Rocky, M.M.H., Rahman, I.M.M., Sakai, Y. et al. Enhanced recovery of gold from aqua regia leachate of electronic waste using dithiocarbamate-modified cellulose. J Mater Cycles Waste Manag 26, 816–829 (2024). https://doi.org/10.1007/s10163-023-01824-3

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