A Novel Visible-Light-Driven Photo-Fenton System Composed of Fe-Doped CdIn₂S₄/g-C₃N₄ Heterojunction and H₂O₂ to Remove Methyl Orange

Abstract

In this study, ternary Fe-doped CdIn2S4/g-C3N4 catalyst has been formed by a wet impregnation-calcination method and then characterized by XRD, FE-SEM, TEM, FT-IR, DRS, and photoluminescence spectra. With the experimental conditions of simulating visible-light irradiation, the photocatalytic degradation performance of methyl orange (MO) aqueous solution was studied by adding H2O2 as oxidant. After a series of characterization methods and photocatalytic activity tests on MO dye, the following conclusions were drawn: The ternary Fe-CdIn2S4/g-C3N4 heterojunction has a wider visible-light response range than that of g-C3N4 and binary CdIn2S4/g-C3N4 catalysts; the corresponding forbidden bandwidth has been narrowed. The recombination rate of carriers generated under illumination has been greatly reduced; the amount of dark adsorption has been greatly improved, which in turn promotes the progress of the photocatalytic reaction. It is speculated that its superior dark adsorption potential of the Fe-CdIn2S4/g-C3N4 is due to the positively charged Fe3+ and the negatively charged MO anionic dye, which will generate strong attraction between them.

Comparative Investigation of Doping Cobalt in Graphitic Carbon Nitride with Different Precursors for Peracetic Acid Activation: Decontamination Performance, Catalytic Mechanisms, and Practicability

“…Polymeric graphitic carbon nitride (g-C 3 N 4 ) is a special 2D material . In recent years, it has seemed to be a kind of good supporter, and it is used for metal immobilization for advanced oxidation process catalysis. − Doping metals before g-C 3 N 4 formation can lead to the coordination of metals with nitrogen atoms due to the nitrogen-rich environment, thereby generating M–N x bonds with metal atom clusters. ,, Due to the special structure, peroxide can be activated via a nonradical pathway for organic degradation . High-valent metal species, such as Fe­(IV)/Fe­(V) and Co­(IV), exhibit potential in effectively degrading organic pollutants with electron-rich moieties and also have conspicuous virtue with respect to resistance to inorganic ions and natural organics due to its special selectivity for oxidation. , Using g-C 3 N 4 as a supporter for cobalt immobilization to generate high-valent metal species for the efficient removal of specific pollutants seems to be a promising strategy for the enhancement of wastewater treatment technology.…”