期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 305, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110301
关键词
Adsorption; Electronic wastewater; Gold recovery; Ion separation; Mesoporous silica; Thia-crown ethers
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2017R1A2B2002109, 2020R1A2C1003560]
- Korea Institute of Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry Energy (MOTIE) [20194010201750]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20194010201750] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020R1A2C1003560, 2017R1A2B2002109] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The rapid production rate of electrical and electronic devices demands for gold (Au) recovery and recycling from their generated wastes. However, achieving adsorbents with high selectivity for Au remains a challenge. Herein, an Au3+-selective composite adsorbent (15TCE@SBA-15) was successfully fabricated through covalent attachment of thia-crown ether (15TCE) as ligand on mesoporous silica support SBA-15. The physicochemical properties of 15TCE@SBA-15 were extensively examined using FT-IR, SAXRD, TGA, FE-SEM, EDS mapping, surface area (BET), and pore size distribution (BJH, NLDFT) analysis. To evaluate its ability to selectively capture Au3+, adsorption experiments were conducted. The results revealed that 15TCE@SBA-15 was able to capture 126 mg of Au3+ per gram of sample. More importantly, it was highly selective towards Au3+ with distribution coefficient of K-D similar to 2439 L g(-1) vs. other cations (i.e. Pd2+, Pt4+, Ni2+, Pb2+, Cu2+, Zn2+) present in spent mobile phones with K-D values < 1.0. 15TCE@SBA-15 can concentrate Au3+ up to similar to 19,837 (CF x 10(-3)) times in contrast to other cations with CF x 10(-3) <= 3-1019. 15TCE@SBA-15 is stable with consistent performance in cycled adsorption/desorption runs. General results reveal the potential of 15TCE@SBA-15 for selective Au3+ recovery from secondary sources such as electronic waste leachates and other aqueous streams.
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