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

doi:10.16085/j.issn.1000-6613.2023-1600

Abstract

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

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

CLC Number:

CHAI Duosheng, GAO Feng, WU Youbing, SUN Xin, HAO Ran, YANG Yu, JIAO Xiangfei. Reaction dynamics and influencing factors of capacitive deionization desalination using γ-Al₂O₃/ CuO-ACF[J]. Chemical Industry and Engineering Progress, 2024, 43(3): 1637-1647.

柴多生, 高峰, 吴友兵, 孙昕, 郝然, 杨宇, 焦翔飞. γ-Al₂O₃/CuO-ACF电吸附除盐的影响因素及反应动力学[J]. 化工进展, 2024, 43(3): 1637-1647.

Figures/Tables 18

References 43

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电极材料	外加电压 /V	初始浓度 /mg·L^-1	SAC /mg·g^-1	参考文献
ACF-HNO₃	1.2	500	12.80	[38]
NPC@ACF	1.2	500	14.63	[39]
Al₂O₃-ACF	2.0	500	12.25	[17]
ACF	1.4	500	10.16	本工作
γ-Al₂O₃/CuO-ACF	1.4	500	16.97	本工作

电极材料	外加电压 /V	初始浓度 /mg·L^-1	SAC /mg·g^-1	参考文献
ACF-HNO₃	1.2	500	12.80	[38]
NPC@ACF	1.2	500	14.63	[39]
Al₂O₃-ACF	2.0	500	12.25	[17]
ACF	1.4	500	10.16	本工作
γ-Al₂O₃/CuO-ACF	1.4	500	16.97	本工作

外加电压 /V	ACF				γ-Al₂O₃/CuO-ACF
外加电压 /V	R²	Q_m/mg·g^-1	K_L	R_L	R²	Q_m/mg·g^-1	K_L	R_L
0.8	0.9944	13.26	0.0048	0.8065	0.9988	11.12	0.0089	0.1841
1.0	0.9935	13.81	0.0053	0.7891	0.9960	14.06	0.0102	0.1633
1.2	0.9931	13.94	0.0067	0.7491	0.9966	15.20	0.0148	0.1189
1.4	0.9925	14.48	0.0080	0.7135	0.9912	15.73	0.0292	0.0640
1.6	0.9923	16.25	0.0086	0.6993	0.9946	19.05	0.0410	0.0465

外加电压 /V	ACF				γ-Al₂O₃/CuO-ACF
外加电压 /V	R²	Q_m/mg·g^-1	K_L	R_L	R²	Q_m/mg·g^-1	K_L	R_L
0.8	0.9944	13.26	0.0048	0.8065	0.9988	11.12	0.0089	0.1841
1.0	0.9935	13.81	0.0053	0.7891	0.9960	14.06	0.0102	0.1633
1.2	0.9931	13.94	0.0067	0.7491	0.9966	15.20	0.0148	0.1189
1.4	0.9925	14.48	0.0080	0.7135	0.9912	15.73	0.0292	0.0640
1.6	0.9923	16.25	0.0086	0.6993	0.9946	19.05	0.0410	0.0465

外加电压 /V	ACF			γ-Al₂O₃/CuO-ACF
外加电压 /V	R²	K_F	n	R²	K_F	n
0.8	0.9689	0.1485	1.4858	0.9888	0.3918	1.9290
1.0	0.9706	0.1891	1.4570	0.9832	0.5065	1.9488
1.2	0.9765	0.1945	1.4270	0.9855	0.7124	1.9222
1.4	0.9894	0.2504	1.4531	0.9845	1.1903	2.0099
1.6	0.9915	0.2718	1.3894	0.9854	1.4228	1.9410

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

γ-Al₂O₃/CuO-ACF电吸附除盐的影响因素及反应动力学

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