Removal of mixed contaminants Cr(VI) and Cu(II) by green synthesized iron based nanoparticles

Removal of mixed contaminants Cr(VI) and Cu(II) by green synthesized iron based nanoparticles
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绿色合成铁基纳米粒子去除混合污染物 Cr(VI) 和 Cu(II)

DOI:
10.1016/j.ecoleng.2016.08.003
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发表时间:
2016-12
影响因子:
3.8
通讯作者:
Zuliang Chen
Zuliang Chen
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Xiulan Weng;Xiaoying Jin;Jiajiang Lin;Ravi Naidu;Zuliang Chen

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在这项研究中,铁基纳米粒子(Fe NPs)合成的荷叶提取物被用来去除混合Cr(VI)和Cu(II),其中效率分别为58.9%和33.0%,分别。相比之下,只有20.2%的Cr(VI)和11.8%的Cu(II)的吸附去除使用eucalyptusleaf提取物。此外,混合Cr(VI)和Cu(II)的去除机制的基础上的吸附和还原的Fe纳米粒子的各种表征技术,包括铁纳米粒子,铁氧化物和覆盖层的形成证实。动力学研究表明,Cr(VI)和Cu(II)的吸附符合准二级动力学模型; Cr(VI)和Cu(II)的还原符合准一级动力学模型。最后,铁纳米颗粒不仅去除电镀废水中的Cr(VI)和Cu(II),而且还去除电镀废水中的Pb(II)和Zn(II)。这为利用绿色铁纳米颗粒去除金属离子提供了新的见解,具有低成本和环境友好的修复策略。
In this study, iron based nanoparticles (Fe NPs) synthesized byeucalyptusleaf extracts was used to remove mixed Cr(VI) and Cu(II), where the efficiency was 58.9% and 33.0%, respectively. In contrast, only 20.2% of Cr(VI) and 11.8% of Cu(II) were removed by adsorption usingeucalyptusleaf extracts. In addition, the removal mechanism for mixed Cr(VI) and Cu(II) based on both adsorption and reduction by Fe NPs was confirmed by various characterization techniques, including the formations of Fe NPs, iron oxides and capping layer. Furthermore, the kinetics suggested that firstly, their sorption followed the pseudo second-order model well; and secondly, reduction of Cr(VI) and Cu(II) followed the pseudo-first-order model well. Finally, Fe NPs not only removed Cr(VI) and Cu(II), but also Pb(II) and Zn(II) in electroplating wastewater. This provides a new insights into the removal of metal ions using green Fe NPs with a low cost and environmentally friendly remediation strategy.
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