Synthesis, Characterization and Application of Ferrous Iron-Embedded Schwertmannite for Cr(VI) Reduction–Adsorption from Aqueous Solutions

IF 2.6 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

International Journal of Environmental Research Pub Date : 2024-02-17 DOI:10.1007/s41742-024-00570-0

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Abstract

Previous studies have demonstrated that schwertmannite (Sch) exhibits good adsorption performance for Cr(VI). In order to further enhance the ability to remove Cr(VI), this study prepared a novel composite (Fe(II)@Sch) by embedding ferrous iron (Fe(II)) on Sch. The adsorption performance of Cr(VI) on Fe(II)@Sch was investigated by batch adsorption experiments, and a possible removal mechanism was proposed through characterization analysis. The results showed that the optimal Fe/Sch ratio for Fe(II)@Sch preparation was 120 mmol/g. Fe(II)@Sch enabled efficient and rapid adsorption of Cr(VI). The maximum Cr(VI) adsorption capacity of Fe(II)@Sch was 4.17 mmol/g at pH 6.0, which was 69% higher when compared to Sch, and 81% of the maximum adsorption could be achieved within 1 min. The embedding of Fe(II) led to a decrease in the particle size and an increase in the specific surface area (SSA) of Sch, which could be considered favorable for adsorption. After four repeated cycles 93.3% of the original Cr(VI) adsorption capacity was still maintained. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analysis showed that the interaction between Fe(II)@Sch and Cr(VI) followed an adsorption–reduction mechanism. The results demonstrated that Fe(II)@Sch could be used as an effective material for removing Cr(VI) from wastewater.

Graphical Abstract

Abstract Image

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用于从水溶液中还原-吸附 Cr(VI) 的铁包覆 Schwertmannite 的合成、表征和应用

摘要以前的研究表明，施华洛世奇（Sch）对六价铬具有良好的吸附性能。为了进一步提高对六价铬的去除能力，本研究通过在 Sch 上包埋亚铁（Fe(II)）制备了一种新型复合材料（Fe(II)@Sch），通过批量吸附实验研究了六价铬在 Fe(II)@Sch 上的吸附性能，并通过表征分析提出了可能的去除机理。结果表明，制备 Fe(II)@Sch 的最佳 Fe/Sch 比率为 120 mmol/g。Fe(II)@Sch 能够高效、快速地吸附 Cr(VI)。在 pH 值为 6.0 时，Fe(II)@Sch 对 Cr(VI) 的最大吸附量为 4.17 mmol/g，比 Sch 高出 69%，且在 1 分钟内就能达到最大吸附量的 81%。Fe(II)的嵌入导致 Sch 的粒径减小，比表面积（SSA）增大，有利于吸附。经过四次重复循环后，仍能保持 93.3% 的原始 Cr(VI) 吸附能力。X 射线光电子能谱和傅立叶变换红外光谱分析表明，Fe(II)@Sch 与 Cr(VI) 之间的相互作用遵循一种吸附-还原机制。结果表明，Fe(II)@Sch 可用作去除废水中六价铬的有效材料。图表摘要

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来源期刊

International Journal of Environmental Research 环境科学-环境科学

CiteScore

5.40

自引率

0.00%

发文量

104

审稿时长

1.7 months

期刊介绍： International Journal of Environmental Research is a multidisciplinary journal concerned with all aspects of environment. In pursuit of these, environmentalist disciplines are invited to contribute their knowledge and experience. International Journal of Environmental Research publishes original research papers, research notes and reviews across the broad field of environment. These include but are not limited to environmental science, environmental engineering, environmental management and planning and environmental design, urban and regional landscape design and natural disaster management. Thus high quality research papers or reviews dealing with any aspect of environment are welcomed. Papers may be theoretical, interpretative or experimental.

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