Prussian blue analog-based ionic liquid for highly efficient cesium removal from wastewater

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2024-12-20 DOI:10.1016/j.cej.2024.158803

Shi-Wei Ma, Shuang-Long Wang, Xiao-Lan Yang, Ling-Qiong Gou, Qian Huang, Guo-Hong Tao, Ling He

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Abstract

Radioactive cesium isotopes constitute a significant fraction of nuclear wastewater contaminants, and the high solubility of cesium as an alkali metal poses challenges to its separation. Utilizing Prussian Blue Analogs (PBAs) for adsorption is an effective strategy for cesium removal, yet there is a paucity of research on PBAs-based ionic liquid for enhancing cesium adsorption performance. In this study, a Prussian Blue Analog-based ionic liquid (IPBA) constructed from tetradecyl trimethyl ammonium (TTAB) was introduced and synthesized for the adsorption of cesium. Batch adsorption experiments indicate that the IPBA consistently achieves over 95 % cesium removal across a broad pH spectrum (pH = 2–12), exhibiting excellent stability. The coordination adsorption mechanism of IPBA is confirmed through the use of XPS, FT-IR, and XRD analyses. The incorporation of hydrophobic long chains significantly enhances the selectivity of IPBA for alkali metals, such as potassium (K⁺) and sodium (Na⁺), with a cesium removal efficiency of 98.02 % even in the presence of competing ions at certain concentrations. Column adsorption experiments reveal that IPBA can efficiently remove cesium (99.24 %) within 12 h, even at a higher flow rate of 0.56 mL·s⁻¹. This research offers insights into the design and synthesis of PBAs-based ionic liquid and highlights the potential of ionic liquid in customizing the properties of PBAs for targeted environmental remediation applications.

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普鲁士蓝离子液体高效去除废水中的铯

放射性铯同位素构成了核废水污染物的很大一部分，铯作为碱金属的高溶解度给其分离带来了挑战。利用普鲁士蓝类似物（PBAs）进行吸附是一种有效的除铯策略，但基于PBAs的离子液体用于提高铯吸附性能的研究较少。以十四烷基三甲基铵（TTAB）为原料，合成了一种吸附铯的普鲁士蓝类似物离子液体（IPBA）。批量吸附实验表明，IPBA在较宽的pH范围内（pH = 2-12）始终能达到95% %以上的铯去除率，表现出优异的稳定性。通过XPS、FT-IR和XRD分析证实了IPBA的配位吸附机理。疏水长链的掺入显著提高了IPBA对钾（K+）和钠（Na+）等碱金属的选择性，即使在一定浓度的竞争离子存在下，对铯的去除率也达到98.02 %。柱吸附实验表明，即使在0.56 mL·s−1的流速下，IPBA也能在12 h内有效去除铯（99.24 %）。本研究为基于PBAs的离子液体的设计和合成提供了见解，并强调了离子液体在定制PBAs特性以用于靶向环境修复应用方面的潜力。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.