双功能修改增强了从盐水中提取的方法,使用基于的离子膜电极
Junxiang Zhang1, Zeyu Cheng1, Xinbo Qin1
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS applied materials & interfaces
|June 11, 2023
概括
研究人员开发了一种双功能膜电极,使用一种用减少的氧化石墨烯和酸修改的基于的离子. 这种增强的电极显著改善了离子吸附和与盐水溶液中的共存离子的分离.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 环境科学 环境科学
背景情况:
- 盐湖盐水是的重要来源,对电池至关重要.
- 从盐水中共存的离子中分离离子 (Li+) 仍然是一个重大挑战.
研究的目的:
- 设计一种具有增强导电性和水友性的双功能膜电极,以实现高效的离子吸附.
- 为了改善离子与盐湖盐水中的共存离子的分离.
主要方法:
- 使用H2TiO3离子 (HTO) 修改了减少的石墨烯氧化物 (RGO) 的导电性和酸 (TA) 的水友性来制造膜电极.
- 加入聚乙醇 (PVA) 作为粘合剂,以进一步增强宏观的水友性.
- 电化学测试用于评估吸附能力,选择性和循环稳定性.
主要成果:
- 经过修改的HTO/RGO-TA电极在2小时内表现出25.2毫克g-1的吸附能力,是未经修改的HTO (12.0毫克g-1) 的两倍多.
- 电极在分离Na+/Li+和Mg2+/Li+方面表现出极好的选择性.
- 修改后的电极表现出良好的循环稳定性,表明其长期使用的潜力.
结论:
- 双功能修改显著提高了用于吸附的HTO离子的电化学性能.
- 开发的电极提供了一种高效和选择性的方法,用于从盐水资源中提取.
- 涉及H+/Li+交换和Li-O键形成的离子交换机制是吸附过程的关键.
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