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

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

Environmental science and pollution research international 2023 Apr

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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. © 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Citation

Zehua Wang, Linhao Xu, Ningning Su, Shuhan Zhu, Daishe Wu. Preparation of amino-functionalized fly ash based tobermorite for enhanced removal of Cr(VI). Environmental science and pollution research international. 2023 Apr;30(19):54547-54555