Selective adsorption and recovery of precious metal ions using protein-rich biomass as efficient adsorbents |
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| Institution: | 1. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan;2. Organization of Advanced Science and Technology, Kobe University, Kobe 657-8501, Japan;3. Department of Applied Chemistry, Graduate School of Engineering and Center for Future Chemistry, Kyushu University, 744 Moto-oka, Fukuoka 819-0395, Japan;1. School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;2. Department of Marine Environmental Engineering and Institute of Marine Industry, Gyeongsang National University, 38 Cheondaegukchi-gil, Tongyeong, Gyeongnam 650-160, Republic of Korea;1. Department of Marine Environmental Engineering and Institute of Marine Industry, Gyeongsang National University, 38 Cheondaegukchi-gil, Tongyeong, Gyeongnam 650-160, Republic of Korea;2. School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;3. Department of Bioprocess Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Chemical Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea;1. School of Chemical Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea;2. Department of Bioprocess Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea |
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| Abstract: | Various types of protein-rich biomass were examined as selective and environment-friendly adsorbents for precious metal ions. In the presence of base metal ions, Au3+, Pd2+ and Pt4+ ions were selectively adsorbed to samples of protein-rich biomass. Among the biomass samples tested, egg-shell membrane exhibited the highest adsorption ability and had high selectivity for Au, Pd and Pt ions. The maximum adsorption amount of Au, Pd and Pt ions to egg-shell membrane was approximately 250, 110 and 50 mg/g, respectively, in the presence of 0.1 M HCl. Microscopic observations and metal-ion desorption studies suggested that the precious metal ions were adsorbed and a portion of them was reduced to form metal nanoparticles on the egg-shell membrane, leading to high adsorption ratios. Investigations using glycoproteins indicated the importance of sugar chains in the adsorption of Au ions to the egg-shell membrane. Successful recovery of Au, Pd and Pt ions from industrial waste solutions was also demonstrated using egg-shell membrane. Biomass sheets (1 mm thick) made from egg-shell membrane also exhibited adsorption abilities for precious metal ions. |
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| Keywords: | Biosorption Noble metal ions Protein Recycle Selective binding |
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