Understanding the adsorption behavior of dimethyl methylphosphonate (DMMP), a key simulant for some nerve agents, is crucial for developing effective protective measures and ensuring environmental safety against harmful chemical warfare agents. This study systematically explores the liquid-phase adsorption of DMMP over branched poly(ether imide) (Ultem) and its Ce(OH)₄/Zr(OH)₄ metal hydroxide composites. Utilizing UV–visible (UV–vis) spectroscopy, the adsorption process was monitored over time to analyze the interplay between various Ultem-based composites and DMMP molecules. Nonreactive Ultem materials were experimentally identified as suitable adsorbents for liquid-phase DMMP capture, providing a novel avenue for protective filtration technologies. It was found that incorporating 30 wt % Ce(OH)₄ into Ultem yields the highest DMMP uptake, reaching an impressive adsorption capacity of 10.20 mmol g^–1 at room temperature (i.e., 22 ± 1 °C). Furthermore, the 30 wt % Ce(OH)₄-coated Ultem composite demonstrated the fastest kinetic response (0.39 mmol g^–1 min^–1) across all samples. Our results revealed a combined physisorption–chemisorption mechanism for DMMP adsorption over Ultem-based composite adsorbents. After three adsorption–desorption cycles, the Ultem composites retained their >93% efficiency. These findings are significant in revealing the underlying factors that govern DMMP adsorption over Ultem-based materials, offering insights into the role of metal hydroxides in enhancing adsorption properties. This research has implications for the design and development of advanced materials for chemical defense, environmental safety, and industry.

中文翻译：

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甲基膦酸二甲酯在聚醚酰亚胺及其金属氢氧化物集成复合材料上的液相吸附

了解甲基膦酸二甲酯 (DMMP)（某些神经毒剂的关键模拟物）的吸附行为对于制定有效的防护措施和确保针对有害化学战剂的环境安全至关重要。本研究系统地探讨了 DMMP 在支化聚醚酰亚胺 (Ultem) 及其 Ce(OH) ₄ /Zr(OH) ₄金属氢氧化物复合材料上的液相吸附。利用紫外可见 (UV-vis) 光谱，随着时间的推移监测吸附过程，以分析各种基于 Ultem 的复合材料和 DMMP 分子之间的相互作用。非反应性 Ultem 材料​​经实验鉴定为适合液相 DMMP 捕获的吸附剂，为保护性过滤技术提供了一条新途径。结果发现，将 30 wt% Ce(OH) ₄掺入Ultem 中可产生最高的 DMMP 吸收，在室温（即 22 ± 1 °C）下达到令人印象深刻的 10.20 mmol g ^–1吸附容量。此外，30 wt% Ce(OH) ₄涂层的 Ultem 复合材料在所有样品中表现出最快的动力学响应 (0.39 mmol g ^–1 min ^–1 )。我们的结果揭示了基于 Ultem 的复合吸附剂吸附 DMMP 的物理吸附-化学吸附联合机制。经过三个吸附-解吸循环后，Ultem 复合材料保持了 >93% 的效率。这些发现对于揭示 Ultem 基材料上控制 DMMP 吸附的潜在因素具有重要意义，为了解金属氢氧化物在增强吸附性能方面的作用提供了见解。这项研究对化学防御、环境安全和工业先进材料的设计和开发具有重要意义。