Eddy Diana Rakhmawaty, Nursyamsiah Dian, Permana Muhamad Diki, Noviyanti Atiek Rostika, Rahayu Iman
Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang Km. 21 Jatinangor, Sumedang 45363, Indonesia.
Materials (Basel). 2022 Jan 3;15(1):332. doi: 10.3390/ma15010332.
The danger from the content of dyes produced by textile-industry waste can cause environmental degradation when not appropriately treated. However, existing waste-treatment methods have not been effective in degrading dyes in textile waste. Zero-valent iron (ZVI), which has been widely used for wastewater treatment, needs to be developed to acquire effective green production. Tea () leaves contain many polyphenolic compounds used as natural reducing agents. Therefore, this study aims to synthesize ZVI using biological reducing agents from tea-leaf extract and apply the Fenton method to degrade the color mixture of rhodamine B and methyl orange. The results show that the highest polyphenols were obtained from tea extract by heating to 90 °C for 80 min. Furthermore, PSA results show that ZVI had a homogeneous size of iron and tea extract at a volume ratio of 1:3. The SEM-EDS results show that all samples had agglomerated particles. The ZVI 1:1 showed the best results, with a 100% decrease in the color intensity of the dye mixture for 60 min of reaction and a degradation percentage of 100% and 66.47% for rhodamine B and methyl orange from LC-MS analysis, respectively. Finally, the decrease in COD value by ZVI was 92.11%, higher than the 47.36% decrease obtained using Fe(II).
纺织工业废料产生的染料所含物质若未经适当处理，其危害会导致环境退化。然而，现有的废料处理方法在降解纺织废料中的染料方面效果不佳。已广泛用于废水处理的零价铁（ZVI）需要进一步改进以实现有效的绿色生产。茶叶含有许多用作天然还原剂的多酚类化合物。因此，本研究旨在利用茶叶提取物中的生物还原剂合成ZVI，并应用芬顿法降解罗丹明B和甲基橙的混合染料。结果表明，将茶叶提取物加热至90°C并保持80分钟可获得最高含量的多酚。此外，PSA结果表明，ZVI在铁与茶叶提取物的体积比为1:3时具有均匀的粒径。SEM-EDS结果表明，所有样品均有团聚颗粒。ZVI 1:1表现出最佳效果，反应60分钟后染料混合物的颜色强度降低100%，LC-MS分析显示罗丹明B和甲基橙的降解率分别为100%和66.47%。最后，ZVI使化学需氧量（COD）值降低了92.11%，高于使用Fe(II)时降低的47.36%。
