Chromium (VI) removal by magnetite nanoparticles immobilized with extracellular polymeric substances extracted from Lysinibacillus sp. WH.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Environment Research Pub Date : 2024-08-01 DOI:10.1002/wer.11102
Phoomipat Jungcharoen, Phawida Mekhin, Jiratchaya Seelaphat, Prasit Thongbai, Jindarat Ekprasert
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Abstract

Magnetite nanoparticles (nano-Fe3O4) and nano-Fe3O4 immobilized with bacterial extracellular polymeric substances (EPSs) extracted from Lysinibacillus sp. WH (Fe3O4/bact) were comparatively studied for the removal of Cr (VI) ions from aqueous solution in batch study. The objectives were to explore the removal of Cr (VI) efficiency by nano-Fe3O4 and Fe3O4/bact under varying bacterial concentrations at a range of acidic pH. Results indicated that 150 ppm Cr (VI) could be effectively removed by 5 g/L of nano-Fe3O4 at pH 4, with the efficiency of 89.2 ± 12%. The equilibrium time, determined by a pseudo-second-order model (R2 = 0.9983), was after 5 h, indicating chemical adsorption. The Cr (VI) removal by the nano-Fe3O4 immobilized with bacterial EPS was effective and steady under a wide range of acidic conditions although bacterial EPS has an alkaline nature. Here, we are the first to demonstrate that Cr (VI) removal efficiency by different concentrations of EPS was not significantly different, suggesting EPS concentration is possibly not the most crucial factor to be optimized for Cr (VI) removal in the future. This study shows the potential application of nano-Fe3O4 immobilized with bacterial EPS for wastewater treatment. PRACTITIONER POINTS: The equilibrium time for magnetite nanoparticles to remove Cr (VI) is 5 h, suggesting chemical adsorption. The Cr (VI) removal efficiency of either magnetite nanoparticles or bacterial EPS is stable under a wide range of acidic conditions. Magnetite nanoparticles immobilized with bacterial EPS extracted from Lysinibacillus sp. WH has a potential application for Cr (VI) removal in wastewater.

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用从溶血芽孢杆菌提取的胞外聚合物物质固定的磁铁矿纳米颗粒去除铬(Ⅵ) WH.
批量研究了磁铁矿纳米颗粒(纳米-Fe3O4)和固定了从 Lysinibacillus sp. WH 提取的细菌胞外聚合物质(EPSs)的纳米-Fe3O4(Fe3O4/bact)去除水溶液中六价铬离子的效果。研究目的是探讨在酸性 pH 值范围内,不同细菌浓度下纳米氧化铁和 Fe3O4/bact 对六价铬的去除效率。结果表明,在 pH 值为 4 时,5 g/L 的纳米氧化铁可有效去除 150 ppm 的六(六)铬,去除率为 89.2 ± 12%。根据假二阶模型(R2 = 0.9983)确定的平衡时间为 5 小时后,这表明存在化学吸附作用。虽然细菌 EPS 具有碱性,但固定了细菌 EPS 的纳米 Fe3O4 在各种酸性条件下都能有效、稳定地去除 Cr (VI)。在此,我们首次证明了不同浓度的 EPS 对六价铬的去除效率没有显著差异,这表明 EPS 浓度可能不是未来去除六价铬的最关键因素。这项研究表明,用细菌 EPS 固定纳米氧化铁具有应用于废水处理的潜力。实践点:磁铁矿纳米颗粒去除 Cr (VI) 的平衡时间为 5 h,表明存在化学吸附作用。在各种酸性条件下,磁铁矿纳米颗粒或细菌 EPS 的六(Cr)去除率都很稳定。从溶血芽孢杆菌 WH 中提取的细菌 EPS 固定化磁铁矿纳米颗粒具有去除废水中六价铬的潜在应用价值。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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