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首页> 外文期刊>Journal of nano research >Green Synthesis of Nanoscale Zero-Valent Iron/Activated Carbon Composites and their Application for Copper and Chromium Removal from Aqueous Solutions
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Green Synthesis of Nanoscale Zero-Valent Iron/Activated Carbon Composites and their Application for Copper and Chromium Removal from Aqueous Solutions

机译：纳米级零价熨斗/活性炭复合材料的绿色合成及其对水溶液中铜和铬去除的应用

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摘要

In this study, nanoscale zero-valent iron (nZVI) particles and their composites with powdered activated carbon (nZVI-PAC) and granular activated carbon (nZVI-GAC) were successfully synthesized via a low-cost green approach with the use of green tea extract. The adsorbents were then used to remove Cr and Cu from aqueous solutions, and their adsorption results were fitted with the Freundlich and Langmuir models. The synthesized adsorbents were characterized using XRD, FTIR, and FESEM techniques. The typical peak of Fe~(0)was detected in the XRD patterns of prepared samples, but the presence of organic compounds in green tea extract weakened related peak. The FESEM characterization demonstrated that the nZVI spherical particles had a chain-like structure and ranging in size from 10 to 50nm. The presence of polyphenols peak in the FTIR spectra revealed that the green tea extract was responsible for the reduction of the Fe~(2+)to Fe~(0). The maximum adsorbed amount of Cr and Cu was found to be 5.68 and 6.48 mg/g, which was achieved by nZVI-PAC and nZVI, respectively. The nZVI-PAC and nZVI also showed a higher removal efficiency for Cu and Cr by 62% and 94% for an initial concentration of 100 mg/L, respectively. The results showed that nZVI, nZVI-PAC, and nZVI-GAC could be promising and eco-friendly adsorbents for Cr and Cu removal from aqueous solutions.
机译：在该研究中，通过使用绿茶成功地合成了纳米级零价铁（NZVI）颗粒及其具有粉末活性炭（NZVI-PAC）和粒状活性炭（NZVI-GAC）的复合材料提炼。然后使用吸附剂从水溶液中除去Cr和Cu，它们的吸附结果与Freundlich和Langmuir模型配合。使用XRD，FTIR和FESEM技术表征合成的吸附剂。在制备样品的XRD图案中检测到Fe〜（0）的典型峰，但是在绿茶提取物中存在有机化合物的存在削弱了相关的峰。 FeSEM表征证明NZVI球形颗粒具有链状结构，范围为10至50nm。 FTIR光谱中的多酚峰的存在显示，绿茶提取物负责将Fe〜（2+）降低至Fe〜（0）。发现Cr和Cu的最大吸附量为5.68和6.48mg / g，分别通过NZVI-PAC和NZVI实现。 NZVI-PAC和NZVI还分别为Cu和Cr的较高除去效率为62％和94％，分别为100mg / L的初始浓度。结果表明，NZVI，NZVI-PAC和NZVI-GAC可能是用于Cr和Cu从水溶液中去除的良好和环保的吸附剂。

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