Construction of functionalized microcapsule adsorbents using emulsion templates for simultaneous thermal storage and selective adsorption of uranium

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-10-13 DOI:10.1016/j.desal.2024.118193

Yaotao Cai , Xinyi Chen , Jintao Xu , Xiaoxiao Ding , Xiaohua Tian , Yongquan Zhou , Yanan Huang , Pan Wang , Jianming Pan

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引用次数: 0

Abstract

The treatment of nuclear wastewater generates substantial amount of uranium (U(VI)) contaminated wastewater, along with waste heat. Efficiently extracting U(VI) while managing nuclear waste heat is crucial. In this study, the functionalized microcapsule adsorbent (PDA-PO₄³⁻/PEG) was synthesized using an emulsion template method. The synthesis involved the oxidative polymerization of dopamine with the grafting of phosphoric acid functional groups. The resulting black shell layer enabled the conversion of light energy into heat energy, while the inner phase of the microcapsule, composed of polyethylene glycol (PEG), served as a heat storage material. The maximum adsorption capacity of PDA-PO₄³⁻/PEG at 298 K was 242.59 mg g⁻¹, reaching equilibrium within 30 min. The removal efficiency of U(VI) by PDA-PO₄³⁻/PEG exceeded 99 %, even in the presence of various competing metal ions. Thermal and near-infrared light tests demonstrated that a concentration of 2.0 mg mL⁻¹ of PDA-PO₄³⁻/PEG dispersion reached temperature above 80 °C after just 5.0 min of laser irradiation. Furthermore, the latent heat of phase transition was measured at 164.13 J g⁻¹. The PDA-PO₄³⁻/PEG microcapsule demonstrated excellent adsorption capacity and selectivity. It's combined high uranium adsorption performance, selectivity, strong photothermal conversion, and thermal storage capabilities make it a material of significant interest industrial applications.

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利用乳液模板构建功能化微胶囊吸附剂，以同时实现铀的热储存和选择性吸附

核废水处理过程中会产生大量受铀（U(VI)）污染的废水和废热。在管理核废热的同时有效提取铀（VI）至关重要。本研究采用乳液模板法合成了功能化微胶囊吸附剂（PDA-PO43-/PEG）。合成过程包括多巴胺的氧化聚合和磷酸官能团的接枝。由此产生的黑色外壳层可将光能转化为热能，而由聚乙二醇（PEG）组成的微胶囊内相则可作为储热材料。在 298 K 下，PDA-PO43-/PEG 的最大吸附容量为 242.59 mg g-1，并在 30 分钟内达到平衡。即使存在各种竞争金属离子，PDA-PO43-/PEG 对 U(VI) 的去除率也超过了 99%。热和近红外光测试表明，浓度为 2.0 毫克毫升/升的 PDA-PO43-/PEG 分散液在激光照射 5.0 分钟后温度就超过了 80 °C。此外，还测出相变潜热为 164.13 J g-1。PDA-PO43-/PEG 微胶囊具有出色的吸附能力和选择性。它兼具高铀吸附性能、选择性、强光热转换和热存储能力，是一种具有重要工业应用价值的材料。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.