Optimization of Technological Conditions and Desalination Performance Comparison of Capacitive Deionization and Membrane Capacitive Deionization

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Abstract

Graphite cloth was used as the electrode material in the capacitive deionization (CDI) cell. Effects of the technological conditions such as the operating voltage, the flow rate and the thickness of the spacer on the desalination performance of the CDI cell were discussed and analyzed. The results indicate that the desalination efficiency and the specific adsorption capacity both increase at first and then tend to be stable as the operating voltage increasing from 0.8 V to 2.0 V. Along with the increase of the flow rate from 48 mL/min to 238 mL/min, the desalination efficiency and the specific adsorption capacity both increase firstly and then decrease. With the increase of the thickness of the spacer from 0 mm to 1.8 mm, the current efficiency and the specific adsorption capacity reduce firstly and then increase. When the operating voltage is 1.6 V, the flow rate is 142 mL/min and the thickness of the spacer is 1.8 mm, the CDI cell has a better performance with the desalination efficiency of 54.76%, the specific adsorption capacity of 4.29 mg/g and the current efficiency of 10.89%. Under the same optimal technological conditions, the desalination performances of the CDI cell and the membrane capacitive deionization (MCDI) cell were studied and compared after 16 h of multiple adsorption/desorption experiments. The experiment results show that during the adsorption stage of the first cycle, the specific adsorption capacity of MCDI is 1.52 times of that of CDI. The desalination efficiency and the current efficiency of MCDI are about an increase of 31.68% and 36.16% compared to CDI, respectively. After 16 h of cyclic test, MCDI cell has a regeneration rate of 99.01%. It turns out that MCDI shows better desalination performance and recyclability than CDI.

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	Articles by authors
	Wang Yu
	Xu Shichang
	Wang Yue
	Wang Zhiqiang
	Ma Dongya

Keywords： capacitive deionization； membrane capacitive deionization； desalination efficiency； stability； regeneration rate

Received 2016-04-28;

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Wang Yu, Xu Shichang, Wang Yue, Wang Zhiqiang, Ma Dongya.Optimization of Technological Conditions and Desalination Performance Comparison of Capacitive Deionization and Membrane Capacitive Deionization[J] Chemcial Industry and Engineering, 2018,V35(4): 38-45

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