Biochar Loaded Nano Zero Valent Iron for Enrichment and Separation of Rare and Precious Metals in Waste Thin-film Solar Cells
This study used waste biological straw as raw material and prepared biochar through high-temperature pyrolysis.Subsequently,zero valent iron nanoparticles were modified onto biochar materials by adding reducing agents,resulting in zero valent magnetic biochar nanocomposites.Based on the effective recycling of rare and precious metals in waste thin-film solar cells,this composite material has been used to achieve efficient enrichment and separation of rare and precious metals indium,gallium,and selenium in waste thin-film solar cells.Through experimental analysis,the enrichment efficiencies of indium,gallium,and selenium in composite materials were 13.5,23.4,and 18.9 mmol/g,respectively.The average recovery rates of indium,gallium,and selenium spiked ranged from 93.0%to 97.4%,with a relative standard deviation of less than 10%.This confirms that this method has significant advantages in extracting and recovering rare and precious metals from waste thin-film solar cells.
biocharnano zero valent ironwaste thin-film solar cellsrare and precious metalsenrichment and separation
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