Boron and nitrogen co-doped porous carbon derived from sodium alginate enhanced capacitive deionization for water purification

2023, Volume 17, Issue 12

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Frontiers of Chemical Science and Engineering >> 2023, Volume 17, Issue 12 doi: 10.1007/s11705-023-2346-4

Boron and nitrogen co-doped porous carbon derived from sodium alginate enhanced capacitive deionization for water purification

Received: 2023-03-22 Accepted: 2023-09-04 Available online: 2023-09-04

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Abstract

Capacitive deionization can alleviate water shortage and water environmental pollution, but performances are greatly determined by the electrochemical and desalination properties of its electrode materials. In this work, B and N co-doped porous carbon with micro-mesoporous structures is derived from sodium alginate by a carbonization, activation, and hydrothermal doping process, which exhibits large specific surface area (2587 m²·g^‒1) and high specific capacitance (190.7 F·g^‒1) for adsorption of salt ions and heavy metal ions. Furthermore, the materials provide a desalination capacity of 26.9 mg·g⁻¹ at 1.2 V in 500 mg·L^‒1 NaCl solution as well as a high removal capacity (239.6 mg·g^‒1) and adsorption rate (7.99 mg·g^‒1·min^‒1) for Pb²⁺ with an excellent cycle stability. This work can pave the way to design low-cost porous carbon with high-performances for removal of salt ions and heavy metal ions.

Keywords

capacitance deionization ; porous carbon ; B/N co-doping ; heavy metal ions ; water purification

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