Unlocking the Detoxification of Phenanthrene from Water Using Alkali-Activated Slag Mortar

Applied Sciences Pub Date : 2024-08-09 DOI:10.3390/app14166991

Thanh Tai Tran, Quynh Thi Ngoc Le

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Abstract

Low-cost and high-performance materials or techniques that could synergistically remove phenanthrene (PHE) in a simple manner were highly desired. Herein, we reported an alkali-activated slag (AAS) that proved applicable in both construction and environmental protection efforts. AAS was synthesized by mixing ground granulated blast furnace slag (GGBFS) and an alkaline solution. The prepared AAS mortar achieved the highest mechanical strength when using an alkaline activator with a Na2O concentration of 8% by slag weight. Moreover, AAS exhibited excellent sorption performance towards PHE, with the highest sorption performance reaching 44.0 mg/g, which was much higher than that of GGBFS. Sorption of PHE reached equilibrium within approximately 120 h and fit well with the pseudo-second-order model. Furthermore, the primary sorption mechanisms for PHE on AAS were attributed to cation-π interactions, hydrogen bonding, and flocculation. The strategy of using AAS not only met the requirements for high-performance and low-cost materials but also addressed the challenging issues of developing an all-in-one treatment for PHE pollutants, which was of great significance to wastewater purification.

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利用碱激活矿渣砂浆解开水中菲的解毒之谜

低成本、高性能的材料或技术能够以简单的方式协同去除菲（PHE），因此备受青睐。在此，我们报告了一种碱活性矿渣（AAS），它被证明可用于建筑和环境保护工作。AAS 是通过混合研磨粒化高炉矿渣（GGBFS）和碱性溶液合成的。当使用 Na2O 浓度为矿渣重量 8%的碱性活化剂时，制备的 AAS 砂浆达到了最高的机械强度。此外，AAS 对 PHE 具有优异的吸附性能，最高吸附性能达到 44.0 mg/g，远高于 GGBFS。PHE 的吸附在大约 120 小时内达到平衡，与假二阶模型非常吻合。此外，PHE 在 AAS 上的主要吸附机理可归结为阳离子-π 相互作用、氢键作用和絮凝作用。使用 AAS 的策略不仅满足了对高性能、低成本材料的要求，还解决了开发 PHE 污染物一体化处理方法的难题，对废水净化具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Sciences

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