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两种活性炭对水中溶解的磷酸二（2-乙基己基）酯的吸附去除行为

Adsorptive Removal Behavior of Two Activated Carbons for Bis(2-ethylhexyl) Phosphate Dissolved in Water.

作者信息

Chen Lifeng, Tang Jing, Wang Zhuo, Wang Hongling, Feng Wannian, Chen Junjie, Yan Qingqing, Ning Shunyan, Li Wenlong, Wei Yuezhou, Wu Di

机构信息

School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang 421001, China.

Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education, 28 Changsheng West Road, Hengyang 421001, China.

出版信息

Toxics. 2025 Jul 25;13(8):624. doi: 10.3390/toxics13080624.

DOI:10.3390/toxics13080624
PMID:40863900
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12390613/
Abstract

Bis(2-ethylhexyl) phosphate (P204) is widely used in extraction processes in the nuclear and rare earth industries. However, its high solubility in water results in high levels of total organic carbon and phosphorus in aqueous environments, and may also lead to radioactive contamination when it is used to combine with radionuclides. In this paper, we characterized a coconut shell activated carbon (CSAC) and a coal-based activated carbon (CBAC) for the adsorption of P204 and then evaluated their adsorption performance through batch and column experiments. The results found that, except for the main carbon matrix, CSAC and CBAC carried rich oxygen-containing functional groups and a small amount of inorganic substances. Both adsorbents had porous structures with pore diameters less than 4 nm. CSAC and CBAC showed good removal performance for P204 under low pH conditions, with removal efficiencies significantly higher than those of commonly used adsorption resins (XAD-4 and IRA900). The adsorption kinetics of P204 conformed to the pseudo-second-order kinetic model, and the adsorption isotherms conformed to the Langmuir model, indicating a monolayer chemical reaction mechanism. Both adsorbents exhibited strong anti-interference capabilities; their adsorption performance for P204 did not change greatly with the ambient temperature or the concentrations of common interfering ions. Column experiments demonstrated that CSAC could effectively fix dissolved P204 with a removal efficiency exceeding 90%. The fixed P204 could be desorbed with acetone. The findings provide an effective method for the recovery of P204 and the regeneration of spent activated carbon, which shows promise for practical applications in the future.

摘要

磷酸二（2-乙基己基）酯（P204）广泛应用于核工业和稀土工业的萃取过程。然而，它在水中的高溶解度导致水环境中总有机碳和磷含量较高，并且当它与放射性核素结合使用时还可能导致放射性污染。在本文中，我们对椰壳活性炭（CSAC）和煤基活性炭（CBAC）进行了表征，以研究它们对P204的吸附性能，然后通过批量实验和柱实验对其吸附性能进行了评估。结果发现，除了主要的碳基质外，CSAC和CBAC还含有丰富的含氧官能团和少量无机物。两种吸附剂均具有孔径小于4nm的多孔结构。CSAC和CBAC在低pH条件下对P204表现出良好的去除性能，去除效率明显高于常用的吸附树脂（XAD-4和IRA900）。P204的吸附动力学符合准二级动力学模型，吸附等温线符合Langmuir模型，表明其为单分子层化学反应机理。两种吸附剂均表现出较强的抗干扰能力；它们对P204的吸附性能不会随环境温度或常见干扰离子浓度的变化而发生很大改变。柱实验表明，CSAC能够有效地固定溶解态的P204，去除效率超过90%。固定的P204可用丙酮解吸。这些研究结果为P204的回收和废活性炭的再生提供了一种有效的方法，在未来的实际应用中具有广阔前景。

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