Surface engineered nickel sites immobilization in exfoliated graphitic carbon nitride for highly efficient photocatalytic degradation of 2,4 dichlorophenol
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
164
Start Page
105669
ISSN
18761070
Date Issued
2024-11
Author(s)
Abstract
Abstract
Background
The fabrication and homogenous distribution of Ni nanoparticles on ultrathin two-dimensional carbon nitride (g-C3N4single bondCN) can achieve the complete mineralization of 2,4 dichlorophenol (2,4-DCP) under visible light irradiation (420 nm).
Methods
The newly synthesized Ni@CN nanostructure was characterized using various techniques, including XRD, TEM, SEM-EDS elemental mapping, and FT-IR. The Ni@CN nanostructure was used to photodegrade 4-BP, 4-CP, and 2,4-DCP under visible light.
Significant Findings
The Ni@CN nanostructure exhibited remarkable efficiency in the photocatalytic degradation of 2,4-dichlorophenol (2,4-DCP), 4-bromophenol (4-BP), and 4-chlorophenol (4-CP), with reaction rates of 0.114, 0.110, and 0.0352 min-1, respectively. Notably, the catalyst demonstrated superior stability and reusability, maintaining its effectiveness over five repeated cycles of 2,4-DCP degradation. Meanwhile, site-selective Ni doping could generate a hybrid band gap to extend the application of visible light, which can catalyze the dominant production of 1O2 and boost the generation of other highly reactive ROS, including ·OH and ·O2, which were identified by free-radical scavenging tests and further screened by ESR measurements. This study provides a significantly efficient visible-light-active single-atom Ni@CN catalyst for photocatalytic degradation of phenolic compounds.
Subjects
Ni@CN nanostructure
g-C3N4
Chlorinated pollutants
Photocatalytic reaction
Publisher
Elsevier BV
Type
journal article