MXene quantum dots decorated Ni nanoflowers for efficient Cr (VI) reduction

Yali Guo; Yonghua Cheng; Xingchuan Li; Qingqing Li; Xiaotian Li; Ke Chu

doi:10.1016/j.jhazmat.2021.127053

MXene quantum dots decorated Ni nanoflowers for efficient Cr (VI) reduction

J Hazard Mater. 2022 Feb 5;423(Pt A):127053. doi: 10.1016/j.jhazmat.2021.127053. Epub 2021 Sep 4.

Authors

Yali Guo¹, Yonghua Cheng², Xingchuan Li², Qingqing Li², Xiaotian Li², Ke Chu³

Affiliations

¹ School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China. Electronic address: guoyl20180017@163.com.
² School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China.
³ School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China. Electronic address: chukelut@163.com.

PMID: 34523495
DOI: 10.1016/j.jhazmat.2021.127053

Abstract

Nickel@MXene quantum dots (Ni@MQDs), as novel flower-like hybrid materials, were firstly prepared through a simple reduction method. The Ni@MQDs exhibited an outstanding catalytic performance for Cr (VI) reduction with a low activation energy (E_a = 18.9 kJ mol^-1) and a high kinetic constant (k = 0.4779 min^-1) in the presence of formic acid (HCOOH). Density functional theory calculations demonstrated that Ni@MQDs exhibited an upshift of d-band center of active Ni atoms to promote the adsorption of both HCOOH and active H atoms, as well as an improved conductivity to boost the catalytic reaction kinetics, leading to the most favorable catalytic performance. This work may open up a new avenue towards the design and synthesis of novel MQDs-based hybrid catalysts for wastewater treatment.

Keywords: Catalyst; Cr(VI) Reduction; MXene quantum dots; Ni nanoflowers; Wastewater treatment.