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Preparation of amino-functionalized fly ash based tobermorite for enhanced removal of Cr(VI)

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Abstract

Amino-functionalized fly ash based tobermorite (NH2-FAT) was prepared via a two-step process including a hydrothermal preparation of fly ash based tobermorite (FAT) from fly ash (FA) and the impregnation of 3-aminopropyltriethoxysilane (APTES). The characteristics of FA, FAT, and NH2-FAT were systematically measured. The removal capacity of Cr(VI) by FAT and NH2-FAT were comparatively studied. The results indicated that the NH2-FAT presented excellent removal efficiency towards Cr(VI) in the condition of pH of 2. The adsorption capacity of Cr(VI) by NH2-FAT in this study was up to 498.39 mg/g resulted from Langmuir model, which was more superior to that of FAT, other reported FA based adsorbents and most amino-functionalized adsorbents. Furthermore, the removal mechanisms of Cr(VI) by NH2-FAT were ascribed to both electrostatic attraction and reduction to Cr(III) by amino groups. Overall, this work indicates the NH2-FAT is a promising adsorbent for treating wastewater containing Cr(VI), and provides a new utilization method of FA.

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Funding

We would like to thank the financial support from the National Natural Science Foundation of China (No. 52004128) and the Jiangxi Provincial Natural Science Foundation (No. 20224BAB213054). N. Su would like to thank the Graduate Students Innovation Fund of Jiangxi Province (YC2022-s112).

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Authors and Affiliations

  1. School of Resources & Environment, Key Laboratory of Poyang Lake Environmental and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, 330031, China

    Zehua Wang, Linhao Xu, Ningning Su, Shuhan Zhu & Daishe Wu

  2. School of Materials and Chemical Engineering, **xiang University, **xiang, 337000, China

    Daishe Wu

Authors
  1. Zehua Wang
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  2. Linhao Xu
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  3. Ningning Su
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  4. Shuhan Zhu
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  5. Daishe Wu
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Contributions

Zehua Wang: Methodology, Writing-original draft. Linhao Xu: Investigation, Data collection and analysis. Ningning Su: Investigation. Shuhan Zhu: Investigation. Daishe Wu: Reviewing and editing.

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Correspondence to Zehua Wang.

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Wang, Z., Xu, L., Su, N. et al. Preparation of amino-functionalized fly ash based tobermorite for enhanced removal of Cr(VI). Environ Sci Pollut Res 30, 54547–54555 (2023). https://doi.org/10.1007/s11356-023-26269-x

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  • DOI: https://doi.org/10.1007/s11356-023-26269-x

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