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Fabricating Amorphous Zero-Valent Iron for Cr(VI) Efficient Reduction: Unveiling the Effect of Ethylenediamine on Physicochemical Properties
Langmuir ( IF 3.7 ) Pub Date : 2023-03-06 , DOI: 10.1021/acs.langmuir.2c03378 Zishen Lin 1 , Fobang Liu 1 , Chunli Zheng 1, 2 , Aibin Zhu 3 , Xiaowei Ma 4 , Yuanzhe Peng 4 , Chi He 1, 2
Langmuir ( IF 3.7 ) Pub Date : 2023-03-06 , DOI: 10.1021/acs.langmuir.2c03378 Zishen Lin 1 , Fobang Liu 1 , Chunli Zheng 1, 2 , Aibin Zhu 3 , Xiaowei Ma 4 , Yuanzhe Peng 4 , Chi He 1, 2
Affiliation
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Amorphous zero-valent iron (AZVI) has attracted wide attention due to its high-efficiency reduction ability. However, the effect of different EDA/Fe(II) molar ratios on the physicochemical properties of the synthesized AZVI requires further investigation. Herein, series of AZVI samples were prepared by changing the molar ratio of EDA/Fe(II) to 1/1 (AZVI@1), 2/1 (AZVI@2), 3/1 (AZVI@3), and 4/1 (AZVI@4). When the EDA/Fe(II) ratio increased from 0/1 to 3/1, the Fe0 proportion on the AZVI surface increased from 26.0 to 35.2% and the reducing ability was enhanced. As for AZVI@4, the surface was severely oxidized to form a large amount of Fe3O4, and the Fe0 content was only 74.0%. Moreover, the removal ability of Cr(VI) was in the order AZVI@3 > AZVI@2 > AZVI@1 > AZVI@4. The isothermal titration calorimetry results revealed that the increase of the molar ratio of EDA/Fe(II) would lead to the stronger complexation of EDA with Fe(II), which resulted in the gradual decrease of the yield of AZVI@1 to AZVI@4 and the gradual deterioration of water pollution after the synthesis. Therefore, based on the evaluation of all indicators, AZVI@2 was the optimal material, not only because its yield was as high as 88.7% and the secondary water pollution level was low, but most importantly, the removal efficiency of Cr(VI) by AZVI@2 was excellent. Furthermore, the actual Cr(VI) wastewater with the concentration of 14.80 mg/L was treated with AZVI@2, and the removal rate of 97.0% was achieved after only a 30 min reaction. This work clarified the effect of different ratios of EDA/Fe(II) on the physicochemical properties of AZVI, which provided insights for guiding the reasonable synthesis of AZVI and is also conducive to investigating the reaction mechanism of AZVI in Cr(VI) remediation.
中文翻译：
制备无定形零价铁以有效还原 Cr(VI)：揭示乙二胺对理化性质的影响
非晶零价铁（AZVI）由于其高效还原能力而受到广泛关注。然而，不同的 EDA/Fe(II) 摩尔比对合成的 AZVI 的物理化学性质的影响需要进一步研究。在此，通过将 EDA/Fe(II) 的摩尔比更改为 1/1 (AZVI@1)、2/1 (AZVI@2)、3/1 (AZVI@3) 和 4，制备了一系列 AZVI 样品/1 (AZVI@4)。当EDA/Fe(II)比从0/1增加到3/1时， AZVI表面的Fe 0比例从26.0增加到35.2%，还原能力增强。对于AZVI@4，表面被严重氧化形成大量的Fe 3 O 4，而Fe 0含量仅为74.0%。此外，Cr(VI)的去除能力为AZVI@3 > AZVI@2 > AZVI@1 > AZVI@4。等温滴定量热法结果表明，EDA/Fe(II)摩尔比的增加会导致EDA与Fe(II)的络合作用更强，导致AZVI@1对AZVI@的产率逐渐降低4、合成后水体污染逐渐恶化。因此，综合各项指标评价，AZVI@2是最优材料，不仅因为其收率高达88.7%，二次水污染程度低，更重要的是其对Cr(VI)的去除效率AZVI@2 的作品非常棒。此外，实际浓度为14.80 mg/L的Cr(VI)废水经AZVI@2处理，去除率为97。仅 30 分钟反应后就达到了 0%。该工作阐明了EDA/Fe(II)不同配比对AZVI理化性质的影响，为指导AZVI的合理合成提供了思路，也有利于研究AZVI在Cr(VI)修复中的反应机理。
更新日期：2023-03-06
中文翻译：
制备无定形零价铁以有效还原 Cr(VI)：揭示乙二胺对理化性质的影响
非晶零价铁（AZVI）由于其高效还原能力而受到广泛关注。然而，不同的 EDA/Fe(II) 摩尔比对合成的 AZVI 的物理化学性质的影响需要进一步研究。在此，通过将 EDA/Fe(II) 的摩尔比更改为 1/1 (AZVI@1)、2/1 (AZVI@2)、3/1 (AZVI@3) 和 4，制备了一系列 AZVI 样品/1 (AZVI@4)。当EDA/Fe(II)比从0/1增加到3/1时， AZVI表面的Fe 0比例从26.0增加到35.2%，还原能力增强。对于AZVI@4，表面被严重氧化形成大量的Fe 3 O 4，而Fe 0含量仅为74.0%。此外，Cr(VI)的去除能力为AZVI@3 > AZVI@2 > AZVI@1 > AZVI@4。等温滴定量热法结果表明，EDA/Fe(II)摩尔比的增加会导致EDA与Fe(II)的络合作用更强，导致AZVI@1对AZVI@的产率逐渐降低4、合成后水体污染逐渐恶化。因此，综合各项指标评价，AZVI@2是最优材料，不仅因为其收率高达88.7%，二次水污染程度低，更重要的是其对Cr(VI)的去除效率AZVI@2 的作品非常棒。此外，实际浓度为14.80 mg/L的Cr(VI)废水经AZVI@2处理，去除率为97。仅 30 分钟反应后就达到了 0%。该工作阐明了EDA/Fe(II)不同配比对AZVI理化性质的影响，为指导AZVI的合理合成提供了思路，也有利于研究AZVI在Cr(VI)修复中的反应机理。
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