丰富盐水中离子的持续监测,使用选择性电极传感器,修改为多电解质多层聚 (?? 利胺化物) /聚 (4-styrenesulfonate) 的多层
Wenjun Xiang1, Xingyu Wang1, Mi Zhang2
1Department of Civil and Environmental Engineering, University of Connecticut, Storrs, Connecticut 06269, United States.
Environmental science & technology
|December 3, 2024
概括
这项研究引入了离子选择性电极传感器的新型聚电解质多层涂层,通过防止石膏缩放和提高数据准确性,显著改善了丰富盐水中的监测. 先进的传感器系统确保从具有挑战性的盐水环境中可靠地回收.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 在富盐水 (LrB) 中监测离子 (Li+) 对于资源回收至关重要,但受到高离子强度和石膏缩放的阻碍,这降低了电位计离子选择电极 (ISE) 传感器性能.
- 现有的Li+ ISE传感器在复杂的盐水矩阵中保持稳定性和准确性面临挑战,这限制了它们在连续监测场景中的应用.
研究的目的:
- 开发先进的Li+ ISE传感器,能够通过克服石膏引起的表面恶化,在LrB中进行持续监测.
- 增强Li+ ISE传感器的功能和长期性能,以准确测量高离子强度盐中的度.
主要方法:
- +ISE传感器的制造采用聚胺化/聚4-硫酸盐 (PAH/PSS) 的多电解质多层 (PEM) 涂层,作为抗石膏缩放材料.
- 传感器性能的表征,包括Nernst斜率,响应时间,对干扰离子的选择性和阻抗.
- 实施了一种针对盐水量身定制的脱数据处理算法 (bt-DDPA) 和一个根据盐度调整的数学模型来进行数据分析.
- 在LrB中进行15天的连续监测测试,以评估传感器稳定性和抗缩放性质.
主要成果:
- (PAH/PSS) 5.5涂层的Li+ ISE传感器表现出高的Nernst斜率 (59.14 mV/dec),快速响应 (<10秒),以及对常见干扰离子的优异选择性.
- 该PAH/PSS涂层显著降低了传感器阻抗,并在长时间暴露于LrB期间减轻了石膏核和缩放,保持了传感器完整性.
- bt-DDPA和盐度调整模型有效过了传感器漂移和异常,将传感器读数和实验室验证之间的差异减少了46.06%.
结论:
- 将PAH/PSS涂层和bt-DDPA集成为LrB中持续和准确的Li+监测提供了强大的解决方案,解决了盐处理和资源回收方面的关键挑战.
- 这种先进的传感器系统显示出了提高从具有挑战性的盐来源提取过程的效率和可靠性的巨大潜力.
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