生物炭负载纳米零价铁对废旧薄膜太阳能电池中稀贵金属富集分离

Biochar Loaded Nano Zero Valent Iron for Enrichment and Separation of Rare and Precious Metals in Waste Thin-film Solar Cells

本研究采用废弃生物秸秆作为原料,通过高温热解制备生物炭。随后,通过加入还原剂将零价铁纳米粒子修饰在生物炭材料上,获得零价磁性生物炭纳米复合材料。基于废旧薄膜太阳能电池中稀贵金属的有效回收问题,利用该复合材料实现了废旧薄膜太阳能电池中稀贵金属铟、镓、硒高效富集与分离。通过实验分析,复合材料对铟、镓、硒富集效率分别为13.5、23.4、18.9 mmol/g,铟、镓、硒加标平均回收率在93.0%~97.4%范围,相对标准偏差<10%,证实该方法在提取和回收废旧薄膜太阳能电池中的稀贵金属方面具有显著优势。

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.