葡萄糖衍生多孔碳的表面电荷调控与电吸附Cd<sup>2+</sup>性能

doi:10.11896/cldb.23040284

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Abstract Capacitive deionization (CDI) is a promising technology for Cd²⁺ removal owing to the advantages such as simple and convenient operation, low energy consumption, and free of secondary pollution. The key challenge limiting its development is the low adsorption capacity of electrode materials for Cd²⁺. In this work, we used glucose as carbon source, thiourea and sulfur as the dopant to prepare porous carbon materials co-doped with S and N through high-temperature carbonization, and explored its electrochemical adsorption performance for Cd²⁺, by using the prepared carbon material as the electrode. The symmetrical CDI system assembled with identical material for both electrodes achieved a removal capacity of 53 mg·g^-1 for Cd²⁺ at 1.2 V. Furthermore, it was found that with the increase of S and N doping, the surface of carbon materials carries negative charges. Therefore, the asymmetric CDI system assembled by using it as the anode and commercial activated carbon YP-50F as the cathode, and Cd²⁺ removal capacity reached 88.37 mg·g^-1, which was 66.73% higher than symmetrical CDI system. After seven cycles of adsorption-desorption, the capacity retention rate also increased from 62.2% to 81.5%. The removal mechanism of Cd²⁺ was explored by XPS, and the results showed that it was the synergism of double electric layer and surface functional groups. The matching strategy of high-perfor-mance porous carbon electrodes and asymmetric electrodes developed in this work would pave the way for practical application of CDI technology in the treatment of Cd²⁺ and other heavy metal wastewater.

Key words： capacitive deionization glucose porous carbon cadmium surface charge

Published: 25 March 2024 Online: 2024-04-07

CLC number:

TB332

Fund:National Natural Science Foundation of China(22178223).

Corresponding Authors: ^*denglb@szu.edu.cn

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	QIN Lingshuang
	LIU Xing
	DENG Libo

Cite this article:

QIN Lingshuang,LIU Xing,DENG Libo. Tailoring of the Surface Charge of Glucose-derived Porous Carbons and Their Performance for Electrosorption of Cd²⁺[J]. Materials Reports, 2024, 38(6): 23040284-8.

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https://www.mater-rep.com/EN/10.11896/cldb.23040284 OR https://www.mater-rep.com/EN/Y2024/V38/I6/23040284

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