A Ternary Magnetic Recyclable ZnO/Fe3O4/g-C3N4 Composite Photocatalyst for Efficient Photodegradation of Monoazo Dye

Abstract

To develop a highly efficient visible light-induced and conveniently recyclable photocatalyst, in this study, a ternary magnetic ZnO/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst was synthesized for the photodegradation of Monas dye. The structure and optical performance of the composite photocatalyst were characterized using X-ray diffraction (XRD), transmission electron microscopye (TEM), energy dispersive spectroscopy (EDS), photoluminescence (PL) spectra, ultraviolet–visible diffuse reflection, and photo-electrochemistry. The photocatalytic activities of the prepared ZnO/Fe 3 O 4 /g-C 3 N 4 nanocomposites were notably improved, and they were significantly higher than those of pure g-C 3 N 4 and ZnO. Given the presence of the heterojunction between the interfaces of g-C 3 N 4 and ZnO, the higher response to visible light and separation efficiency of the photo-induced electrons and holes enhanced the photocatalytic activities of the ZnO/Fe 3 O 4 /g-C 3 N 4 nanocomposites. The stability experiment revealed that ZnO/Fe 3 O 4 /g-C 3 N 4 -50% demonstrates a relatively higher photocatalytic activity after 5 recycles. The degradation efficiency of MO, AYR, and OG over ZnO/Fe 3 O 4 /g-C 3 N 4 -50% were 97.87%, 98.05%, and 83.35%, respectively, which was due to the number of dye molecules adsorbed on the photocatalyst and the structure of the azo dye molecule. Azo dyes could be effectively and rapidly photodegraded by the obtained photocatalyst. Therefore, the environment-friendly photocatalyst could be widely applied to the treatment of dye contaminated wastewater.

Highly Efficient Photocatalyst Fabricated from the Chemical Recycling of Iron Waste and Natural Zeolite for Super Dye Degradation

“…Table 4 illustrates the photocatalytic performance of our Fe 2 O 3 -zeolite photocatalyst comparing with the previously studied metal oxide and/or zeolite-based photocatalysts for MB dye degradation [46][47][48][49][50][51][52][53]. As shown in this table, the presented photocatalytic performance parameters are much higher than the reported performances for the previously reported catalysts in the literature.…”

Photocatalytic activity enhancement of carbon‐doped g‐C3N4 by synthesis of nanocomposite with Ag2O and α‐Fe2O3

“…The obtained results from GAF spectra (Figure 2e) displayed that the mass ratio of CGNS, Ag 2 O, and α-Fe 2 O 3 nanoparticles are nearly 3, 2, and 1, respectively. [36,37] The uniform distribution of elements was observed in the elemental mapping analysis on the GAF nanocomposite (Figure 3).…”

A magnetically separable and recyclable g-C3N4/Fe3O4/porous ruthenium nanocatalyst for the photocatalytic degradation of water-soluble aromatic amines and azo dyes

“…The addition of porous ruthenium further decreased the PL intensity, which indicated that the g-C 3 N 4 / Fe 3 O 4 /p-RuNP nanocomposite had a much lower recombination rate of the photo-induced electron-hole pairs compared to those in the pristine g-C 3 N 4 nanosheet and g-C 3 N 4 / Fe 3 O 4 NP. 41,49,61,[88][89][90][91][92] Photocatalytic activity towards the removal of aromatic amines…”