Enhanced Photo-Fenton
Catalytic Performance toward
Acid Orange II by FeOCl/CdS Quantum Dot Composites: Density Functional
Theory Calculations and Mechanistic Insights
posted on 2024-02-17, 04:04authored byDongao Xie, Changxin Tang, Dan Li, Jiren Yuan, Feigao Xu
FeOCl has attracted much attention
for its good photo-Fenton
properties.
However, there are still some limitations to the removal efficiency
of organic pollutants. Visible-light-responsive FeOCl/CdS quantum
dot composites were prepared by calcination to overcome their flaws,
and their catalytic activity was explored by the degradation of acid
orange II (AO-II). The experimental results showed that the FeOCl/CdS
composites exhibited better catalytic performance than pure components.
The F1Cd0.5 composite (mass ratio of FeOCl to
CdS is 1:0.5) achieved 98.5% removal efficiency of AO-II, which is
14.8 times higher than that of FeOCl+CdS under similar experimental
conditions; moreover, the F1Cd0.5 composite
still exhibits a high stability after five cycles. According to the
characterization and experimental results with density functional
theory calculations together, it is proposed that the type II carrier
transfer-separation mechanism plays a leading role in enhancing the
photodegradation performance of the photo-Fenton catalysts. This study
provides a new idea to further improve the catalytic efficiency of
the photo-Fenton technology for organic pollutant degradation.