2022 Fiscal Year Final Research Report
Reduction-precipitation mechanizm of precious metals on surface of sulfur-impregnated carbonacious adsorbent and its application for recycling
Project/Area Number |
20K12234
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 64030:Environmental materials and recycle technology-related
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Research Institution | Chiba University |
Principal Investigator |
Wajima Takaaki 千葉大学, 大学院工学研究院, 准教授 (00380808)
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 硫黄担持炭 / バイオマス廃棄物 / リサイクル / 貴金属回収 / 還元析出 / 吸着 / 貴金属還元 |
Outline of Final Research Achievements |
In this study, sulfur-impregnated carbon was prepared from bamboo powder, which is an abundant biomass resource in Japan, via immersion in Na2S solution to pyrolyze at 800 °C for recovering precious metals from strong acidic solution. Sulfur-impregnated carbon had porous structure, high specific surface area and sulfur content. Gold (Au) and palladium (Pd) could be recovered from strong acidic solution by precipitation of Au and Pd metals on the surface of sulfur-impregnated carbon. The adsorption and reduction reaction on the surface of sulfur-impregnated carbon occurred rapidly, and it was observed that metal particles were larger as the reaction time increased. Sulfur-impregnated carbon was able to recover precious metals selectively from simulated electric waste extracted solution containing precious metals with high-concentration of other metals. The gold-supported sulfur-impregnated carbon was found to be useful as a photothermal conversion material for solar evaporation.
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Free Research Field |
環境・リサイクル
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Academic Significance and Societal Importance of the Research Achievements |
学術的意義として、バイオマスに硫黄を導入した硫黄担持炭における強酸性溶液中の貴金属の吸着・還元に関する新たな反応特性が示されたこと、貴金属ナノ粒子や貴金属担持触媒の創製などにも応用が可能であること、が挙げられる。これらは、硫黄に関する材料の生成や特性、その利用に関する新たな知見となる。社会的意義として、これらは我が国における廃棄物からの貴金属回収による循環型社会の形成に寄与でき、海外の鉱山における貴金属の回収率向上にもつながり、我が国の資源の安定確保とともに国際的な資源の安全保障につながると期待できる。
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