通过用三层结构膜涂层电极进行电容性脱离,在广泛的度梯度上有效地除地下水
Chengyi Wang1, Yangbo Qiu1, Chao Wang1
1School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai, 200240 Shanghai, PR China.
Journal of hazardous materials
|October 11, 2023
概括
使用膜/碳纳米管/活性炭 (CNT-MCE) 的新型电极设计有效地从地下水中去除化物. 这种先进的电容脱离离子 (CDI) 电极在广泛的化度范围内显示出更好的盐吸附能力.
科学领域:
- 环境科学与工程环境科学与工程
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 地下水化物污染是一个重大的环境问题.
- 电容脱离离子 (CDI) 是一种有前途的脱技术,但在不同化度的电极性能方面面临挑战.
- 现有的电极由于低度的电双层 (EDL) 叠加和高度的联合离子效应而表现出较差的盐吸附能力 (SAC).
研究的目的:
- 开发一种新型的三层结构电极,用于提高地下水脱的电容脱离离 (CDI) 性能.
- 克服现有电极的局限性,例如EDL重叠和共离子效应,在广泛的化物度范围内.
- 为了提高CDI电极的盐吸附能力 (SAC) 和稳定性,以有效地去除化物.
主要方法:
- 一个三层电极的制造:膜/碳纳米管 (CNT) /活性炭 (AC),称为CNT-MCE,通过电CNT到AC,然后涂抹聚合物膜.
- 用不同度的化 (NaF) 进行电容脱离离子 (CDI) 实验来评估电极性能.
- 电极结构的表征和EDL重叠和联合离子效应的分析.
- 在模拟地下水脱过程中测试稳定性和性能.
主要成果:
- 与交流电和膜涂层电极相比,CNT-MCE电极显示出明显更高的SAC,在100毫克L-1 NaF下达到40.8毫克g-1 .
- 在高NaF度 (1500毫克L-1),CNT-MCE通过有效抑制协离子效应,显示了58.8毫克g-1的改善SAC.
- 电极在广泛的度梯度中保持了出色的稳定性和高的SAC (200-800 mg L-1 NaF),抵抗氧化.
- 成功降低了模拟地下水中的化物度,从3.4到1.1毫克L-1.
结论:
- 开发的膜/碳纳米管/活性炭 (CNT-MCE) 电极提供了一种有效的策略,用于扩大容量脱离离子 (CDI) 用于地下水脱的适用性.
- 半孔占主导地位的结构和CNT-MCE的独特设计有效地减轻EDL重叠和co-ion效应,导致优越的SAC.
- 在广泛的化物度中,CNT-MCE表现出卓越的稳定性和性能,使其成为环境修复的可行解决方案.
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