Functionalization of expanded MXene to recover palladium ions by capacitive deionization

Lu，Jiming1,2,3; Zhang，Shuangzhe1,4; Zhou，Chuan1; Wang，Xinyang1,2; Lu，Binda1,2; Liu，Yi1,2; Li，Yingzhi1,2; Hunter，Timothy N.3; Lu，Zhouguang1,2; Li，Lei1; Harbottle，David3; Xu，Zhenghe1,2

2024-03-20

10.1016/j.seppur.2023.125631

Separation and Purification Technology   影响因子和分区

1383-5866

1873-3794

This work prepared a sulfur/nitrogen co-doped MXene (S/N-MXene) electrode material via a facile hydrothermal method. The electrode material has been specifically designed to recover palladium(II) from wastewater. Numerous S/N-containing functional groups were introduced into the MXene by S and N co-doping, with the contents optimized for the preferential recovery of Pd(II). These functional groups acted as pillars to expand the interlayer spacing of MXene, facilitating Pd diffusion between MXene layers and enhancing accessibility to the anchor sites (–OH groups and heteroatom functional groups). The S/N-MXene electrode exhibited a high recovery capacity of 2.92 mmol g, high recovery efficiency of 96.4 % in 15 min and good long-term cycling performance with greater than 80 % capacity retained after 260 cycles. The S/N-MXene electrode showed preferential adsorption of Pd from wastewater. The adsorption mechanism was elucidated through density functional theory (DFT) calculations showing that the downward shift of the p-band center of the MXene-OH groups induced by pyrrolic-N and -C=S in S/N-MXene (compared to single doping with S or N) favours enhancement of the soft ion-soft ion interactions. Furthermore, the adsorbed Pd on the S/N-MXene electrode could be enriched by simple reversing of the applied voltage to strip the ions from the sorbent, thus avoiding the need to use harsh chemicals for regeneration and minimizing the amount of secondary waste.

Capacitive deionization MXene Nitrogen doping Palladium recovery Sulfur doping

SCI ; EI

英语

第一 ; 通讯

CHEMISTRY

2-s2.0-85177772150

Scopus

1.Department of Materials Science & Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Key University,Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong,Southern University of Science and Technology,Shenzhen,518055,China
3.School of Chemical and Process Engineering,University of Leeds,Leeds,LS2 9JT,United Kingdom
4.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China

Lu，Jiming,Zhang，Shuangzhe,Zhou，Chuan,et al. Functionalization of expanded MXene to recover palladium ions by capacitive deionization[J]. Separation and Purification Technology,2024,332.

Lu，Jiming.,Zhang，Shuangzhe.,Zhou，Chuan.,Wang，Xinyang.,Lu，Binda.,...&Xu，Zhenghe.(2024).Functionalization of expanded MXene to recover palladium ions by capacitive deionization.Separation and Purification Technology,332.

Lu，Jiming,et al."Functionalization of expanded MXene to recover palladium ions by capacitive deionization".Separation and Purification Technology 332(2024).