School of Resources & Environment, Key Laboratory of Poyang Lake Environmental and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, 330031, China.
School of Materials and Chemical Engineering, Pingxiang University, Pingxiang, 337000, China.
Environ Sci Pollut Res Int. 2023 Apr;30(19):54547-54555. doi: 10.1007/s11356-023-26269-x. Epub 2023 Mar 6.
Amino-functionalized fly ash based tobermorite (NH-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 NH-FAT were systematically measured. The removal capacity of Cr(VI) by FAT and NH-FAT were comparatively studied. The results indicated that the NH-FAT presented excellent removal efficiency towards Cr(VI) in the condition of pH of 2. The adsorption capacity of Cr(VI) by NH-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 NH-FAT were ascribed to both electrostatic attraction and reduction to Cr(III) by amino groups. Overall, this work indicates the NH-FAT is a promising adsorbent for treating wastewater containing Cr(VI), and provides a new utilization method of FA.
氨基功能化粉煤灰基托贝莫来石（NH-FAT）通过两步法制备，包括粉煤灰（FA）水热合成托贝莫来石（FAT）和 3-氨丙基三乙氧基硅烷（APTES）浸渍。系统地测量了 FA、FAT 和 NH-FAT 的特性。比较研究了 FAT 和 NH-FAT 对 Cr(VI)的去除能力。结果表明，在 pH 值为 2 的条件下，NH-FAT 对 Cr(VI)具有优异的去除效率。本研究中 NH-FAT 对 Cr(VI)的吸附容量高达 498.39mg/g，符合朗缪尔模型，优于 FAT、其他报道的 FA 基吸附剂和大多数氨基功能化吸附剂。此外，NH-FAT 去除 Cr(VI)的机制归因于氨基的静电吸引和还原为 Cr(III)。总的来说，这项工作表明 NH-FAT 是一种很有前途的用于处理含 Cr(VI)废水的吸附剂，并为 FA 的新利用方法提供了依据。
