The properties and photocatalytic performance comparison of Fe3+-doped g-C3N4 and Fe2O3/g-C3N4 composite catalysts

Abstract

Fe 3+ -doped g-C 3 N 4 and Fe 2 O 3 /g-C 3 N 4 composite catalysts were prepared by a simple method using melamine and ferric nitrate as precursors. X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectra, scanning electron microscopy, photoluminescence, X-ray photoelectron spectroscopy and photocurrent measurements were used to characterize the prepared catalysts. The results indicated that Fe 3+ was inserted at an interstitial position of g-C 3 N 4 by coordinating to N atoms, which exist in a form completely different from those in the Fe 2 O 3 /g-C 3 N 4 composite. The different form of Fe species caused the difference in optical properties, energy band structure and electrons-holes separation rate.The activities of Fe 3+ -doped g-C 3 N 4 and Fe 2 O 3 /g-C 3 N 4 composite catalysts were tested by the photocatalytic degradation of Rhodamine B (RhB) under visible light. The rate constant of Fe 3+ -doped g-C 3 N 4 was 2.5 and 1.8 times higher than that of the g-C 3 N 4 and Fe 2 O 3 /g-C 3 N 4 composite. The possible mechanism is proposed.

Novel magnetic g-C3N4/α-Fe2O3/Fe3O4 composite for the very effective visible-light-Fenton degradation of Orange II

“…Many attempts have been made to fabricate a-Fe 2 O 3 /g-C 3 N 4 composites for photodegrading organic dyes using visible light. 21,22 However, the g-C 3 N 4 /a-Fe 2 O 3 heterogeneous catalyst is not appropriate for practical use because it is difficult to remove from suspension and reuse. Magnetically separable photocatalysts have attracted considerable interest because they can be removed from suspensions easily.…”

Fabrication of α-Fe2O3/g-C3N4 composites for cataluminescence sensing of H2S

“…Bearing these in mind, we devoted efforts to depositing ␣-Fe 2 O 3 on the g-C 3 N 4 sheets to build a composite, which may provided additional sites for the interaction with reaction gas, in expectation for designing a better catalyst. Up to now, Ye [34].…”

Novel P O codoped g-C3N4 with large specific surface area: Hydrothermal synthesis assisted by dissolution–precipitation process and their visible light activity under anoxic conditions

“…However, the high price of noble metals inhibits their practical application. Wang and Hu et al determined that the optical and electronic properties of g-C 3 N 4 could also be altered by transition metal doping such as Fe 3+ [15,16]. Fe-doped g-C 3 N 4 possesses a wider optical absorption range and better photocatalytic performance.…”