化工进展 ›› 2024, Vol. 43 ›› Issue (3): 1637-1647.DOI: 10.16085/j.issn.1000-6613.2023-1600

• 资源与环境化工 • 上一篇    

γ-Al2O3/CuO-ACF电吸附除盐的影响因素及反应动力学

柴多生1(), 高峰2, 吴友兵3, 孙昕1(), 郝然1, 杨宇2, 焦翔飞1   

  1. 1.西安建筑科技大学环境与市政工程学院,陕西 西安 710055
    2.内蒙古自治区水利科学研究院,内蒙古 呼和浩特 010011
    3.马鞍山市城乡规划设计院有限责任公司,安徽 马鞍山 243011
  • 收稿日期:2023-09-11 修回日期:2023-11-20 出版日期:2024-03-10 发布日期:2024-04-11
  • 通讯作者: 孙昕
  • 作者简介:柴多生(1995—),男,硕士研究生,主要研究方向为微咸水淡化。E-mail:cds1712@126.com
  • 基金资助:
    内蒙古自治区水利科技项目(NSK202002);陕西省自然科学基金重点项目(2023-JC-ZD-28);陕西省重点研发计划(2023GXLH-056)

Reaction dynamics and influencing factors of capacitive deionization desalination using γ-Al2O3 / CuO-ACF

CHAI Duosheng1(), GAO Feng2, WU Youbing3, SUN Xin1(), HAO Ran1, YANG Yu2, JIAO Xiangfei1   

  1. 1.School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055,Shaanxi, China
    2.Inner Mongolia Hydraulic Research Institute, Hohhot 010011, Inner Mongolia, China
    3.Urban & Rural Planning & Design Institute of Ma’anshan, Ma’anshan 243011, Anhui, China
  • Received:2023-09-11 Revised:2023-11-20 Online:2024-03-10 Published:2024-04-11
  • Contact: SUN Xin

摘要:

开发脱盐率高、寿命长的电极材料是电容去离子(CDI)水处理技术的研究热点之一。通过一锅水热法将层状CuAl双金属氧化物与活性碳纤维复合,成功制备了CDI电极(γ-Al2O3/CuO-ACF)。采用SEM、XRD、FTIR和CV测试对样品的形貌、结构和电极性能进行了表征。当初始NaCl浓度为500mg/L时,随着电压从0.8V逐渐增加到1.6V,两种电极的比吸附量、脱盐效率、电流效率和电耗均有所增加,γ-Al2O3/CuO-ACF的四项参数依次比ACF提高23.4%~55.3%、44.8%~82.0%、65.5%~90.0%和降低15.0%~21.4%。当腐殖酸浓度为5~10mg/L时,ACF脱盐效率下降明显,而γ-Al2O3/CuO-ACF脱盐效率仅在腐殖酸浓度10mg/L时略有下降。在15次循环后,NaCl溶液体系的脱盐效率保留率为96%;但由于腐殖酸的存在,该值下降为92%。两种电极的电吸附除盐过程遵循Langmuir等温吸附方程,表示盐离子在电极表面为单分子层物理吸附。与传统ACF电极相比,γ-Al2O3/CuO-ACF电极具有优异的可回收性、稳定性和增强的电化学特性。

关键词: 层状CuAl双金属氧化物, 活性碳纤维, 脱盐, 电吸附

Abstract:

Developing electrode materials with a high desalination rate and long life is one of the research hotspots in the field of capacitive deionization (CDI) water treatment technology. CDI electrode (γ-Al2O3/ CuO-ACF) was successfully produced by combining laminated CuAl-mixed metal oxide with activated carbon fibers with a one-pot hydrothermal method. The surface morphology, structure and electrode properties of the samples were characterized by SEM, XRD, FTIR and CV. When the voltage increased from 0.8V to 1.6V under NaCl concentration of 500mg/L, the specific electroabsorption capacity, desalination efficiency, current efficiency and energy consumption increased for both electrodes, while those four parameters for γ-Al2O3/ CuO-ACF were 23.4%—55.3% higher, 44.8%—82.0% higher, 65.5%—90.0% higher and 15.0%—21.4% lower than those for ACF. Under NaCl concentration of 500mg/L and humic acid concentrations of 5—10mg/L, desalination efficiency for ACF was decreased, but that for γ-Al2O3/CuO-ACF was only decreased at humic acid concentration of 10 mg/L. After 15 desalination cycles, the retention rate of desalination efficiency was 96% for NaCl solution system, but that was decreased to 92% with the addition of humic acid. The ion adsorption processes for both cases followed the Langmuir isotherm adsorption kinetic equation, indicating that the salt ions were physically adsorbed on the electrode surface as a single molecular layer. Compared with conventional ACF electrodes, the γ-Al2O3/CuO-ACF electrode had excellent recoverability, stability and enhanced electrochemical properties.

Key words: laminated CuAl-mixed metal oxide, activated-carbon fiber, desalination, capacitive deionization

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