<br>封装微型零价铁的戊二醛交联壳聚糖去除 Cr(VI)：合成、机制和寿命,Journal of Environmental Sciences

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封装微型零价铁的戊二醛交联壳聚糖去除 Cr(VI)：合成、机制和寿命
Journal of Environmental Sciences ( IF 5.9 ) Pub Date : 2023-07-10 , DOI: 10.1016/j.jes.2023.07.005
Yijun Duan ₁ , Fang Liu ₂ , Xiang Liu ₁ , Miao Li ₁

Affiliation

微尺度零价铁 (mZVI) 在地下水 Cr(VI) 修复方面显示出巨大潜力。然而，钝化导致的Cr(VI)去除能力低限制了mZVI的广泛使用。我们通过将 mZVI 封装在多孔戊二醛交联壳聚糖基质中制备了 mZVI/GCS，并通过减少零价铁颗粒之间的接触来减轻钝化层的形成。 mZVI/GCS的平均孔径为8.775 nm，证实了该材料的介孔特性。批量实验结果表明，mZVI/GCS 在较宽的 pH (2-10) 和温度 (5-35°C) 范围内表现出较高的 Cr(VI) 去除效率。常见地下水共存离子对 mZVI/GCS 影响轻微。该材料表现出良好的可重复使用性，8次循环后平均Cr(VI)去除率为90.41%。在这项研究中，我们还进行了动力学和等温线分析。伪二阶模型是最匹配的动力学模型。 Cr(VI)吸附过程由Langmuir和Freundlich等温线模型拟合，mZVI/GCS的最大Langmuir吸附容量达到243.63 mg/g，高于大多数先前研究报道的材料的吸附容量。值得注意的是，在 50 天的实验中，mZVI/GCS 填充柱的 Cr(VI) 去除能力比 mZVI 填充柱高 6.4 倍。因此，具有多孔结构的mZVI/GCS有效缓解了mZVI的钝化问题，作为具有实际应用前景的地下水Cr(VI)修复材料展现出实际应用前景。

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Removal of Cr(VI) by glutaraldehyde-crosslinked chitosan encapsulating microscale zero-valent iron: Synthesis, mechanism, and longevity

Microscale zero-valent iron (mZVI) has shown great potential for groundwater Cr(VI) remediation. However, low Cr(VI) removal capacity caused by passivation restricted the wide use of mZVI. We prepared mZVI/GCS by encapsulating mZVI in a porous glutaraldehyde-crosslinked chitosan matrix, and the formation of the passivation layer was alleviated by reducing the contact between zero-valent iron particles. The average pore diameter of mZVI/GCS was 8.775 nm, which confirmed the mesoporous characteristic of this material. Results of batch experiments demonstrated that mZVI/GCS exhibited high Cr(VI) removal efficiency in a wide range of pH (2-10) and temperature (5-35°C). Common groundwater coexisting ions slightly affected mZVI/GCS. The material showed great reusability, and the average Cr(VI) removal efficiency was 90.41% during eight cycles. In this study, we also conducted kinetics and isotherms analysis. Pseudo-second-order model was the most matched kinetics model. The Cr(VI) adsorption process was fitted by both Langmuir and Freundlich isotherms models, and the maximum Langmuir adsorption capacity of mZVI/GCS reached 243.63 mg/g, which is higher than the adsorption capacities of materials reported in most of the previous studies. Notably, the column capacity for Cr(VI) removal of a mZVI/GCS-packed column was 6.4 times higher than that of a mZVI-packed column in a 50-day experiment. Therefore, mZVI/GCS with a porous structure effectively relieved passivation problems of mZVI and showed practical application prospects as groundwater Cr(VI) remediation material with practical application prospects.

更新日期：2023-07-10

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