Efficient Visible-Light-Responsive Ag3PO4/g-C3N4/Hydroxyapatite Photocatalyst (from Oyster Shells) for the Degradation of Methylene Blue: Preparation, Properties and Mechanism

Abstract

A novel ternary Ag3PO4/g-C3N4/hydroxyapatite photocatalyst was prepared, and its morphology, composition and structure were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, and electron spin resonance, etc. The results show that g-C3N4 is evenly dispersed in the interior of hydroxyapatite, forming a homogeneous composite, and significantly improves the band gap structure of the material as a whole. Ag3PO4/g-C3N4/hydroxyapatite has good electron transfer ability and an appropriate energy band structure, which shows that the material has a good degradation effect and stability. Finally, based on the characterization and experimental results, a possible Z-scheme mechanism was proposed, and the active species involved in the reaction are mainly O2− and h+.

Zn-doped hydroxyapatite@g-C3N4: a novel efficient visible-light-driven photocatalyst for degradation of pharmaceutical pollutants

“…40 Song et al synthesized Ag 3 PO 4 /g-C 3 N4/hydroxyapatite heterogeneous catalyst for the photocatalytic degradation of methylene blue. 41 Chahkandi et al constructed holey g-C 3 N 4 nanosheets with hydroxyapatite nanospheres, and this unique structure showed considerable degradation of bisphenol A. 42 In our present investigation, we successfully synthesized a novel heterogeneous photocatalyst, i.e., Zn-HAp@g-C 3 N 4 nanocomposite, by a facile hydrothermal method followed by ultrasonication.…”

“…40 Song et al synthesized Ag 3 PO 4 /g-C 3 N4/hydroxyapatite heterogeneous catalyst for the photocatalytic degradation of methylene blue. 41 Chahkandi et al constructed holey g-C 3 N 4 nanosheets with hydroxyapatite nanospheres, and this unique structure showed considerable degradation of bisphenol A. 42…”

TiO2/Arabic Gum for Degradation of Pollutants in Water

“…Table 1 summarizes studies using different photocatalysts against the importance of ciprofloxacin. Methylene blue is a cationic dye with an aromatic heterocyclic formula that has been widely reported in the literature as a model pollutant in photocatalytic decolorization tests [22][23][24]. Given its multiple applications, it has essential characteristics when assessing the light spectrum, as it has three absorption maximums: 246 nm, 291 nm, and 663 nm, which refer to degradation and discoloration [25].…”