Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose

Abstract

The defect and metallic silver (Ag) in silver phosphate (Ag3PO4) photocatalyst were successfully generated using hydroxyapatite (HA) and glucose. Two steps of synthesis were done in these experiments. Firstly, the Ag/HA powder was prepared by reacting AgNO3 and HA, followed by the addition of a glucose solution. Secondly, the suspension of Ag/HA was reacted with AgNO3 aqueous solution. The yellow product of Ag/Ag3PO4 photocatalyst was produced. The products were characterized using X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy (DRS), Scanning Electron Microscope (SEM), Brunauer–Emmett–Teller (BET) and X-ray Photoelectron Spectroscopy (XPS). The decreased ratio of O/Ag and metallic Ag formation observed by the XPS was detected as the possible defect and Ag-doping in the photocatalyst. The enhanced photocatalytic activity might be caused by the oxygen vacancy and metallic Ag in Ag3PO4 that enables the separation of photo-generated electrons and holes.

Enhanced photocatalytic hydrogen evolution through suppressed electron–hole recombination in Cs2AgBiBr6-NC/g-C3N4 nanocomposites

“…The two satellite peaks at high-binding-energy positions of 368.8 eV and 374.7 eV in the Ag 3d spectrum of CABB-NC (Fig. S10 †) are in agreement with the Ag 0 state 43 and reveal the presence of metallic silver along with the CABB-NC, although the presence of silver is not observed via XRD. However, no additional satellite peaks corresponding to Ag 0 state are observed in the high-resolution Ag 3d spectra of the CABB-NC/g-C 3 N 4 nanocomposite (Fig.…”

The Enhanced Photocatalytic Properties of Silver Phosphate Synthesized Under Mangosteen Peel Extract Solution

“…The photocatalytic activity was studied using Rhodamine B (RhB) photodecomposition [16]. Typically, 0.1 g of catalyst was dispersed in 100 mL of 10 mg/L Rhodamine B solution.…”

“…The mechanism of photocatalytic was investigated using ammonium oxalate, benzoquinone, and isopropanol as a scavenger for holes, superoxide ion radicals, and hydroxyl radicals, respectively [16]. In this experiment, 1 mmol/L of scavenger was applied in Rhodamine B solution.…”

“…The excellent photocatalytic activity of M-100 might be induced by higher surface area, pore volume, and crystallinities. The mechanism of photocatalysis was investigated by adding ammonium oxalate, benzoquinone, and isopropanol in a photocatalytic reaction as a scavenger to investigate the existence of holes (h + ), superoxide ion (O2 -•) radical, and hydroxyl (•OH) radical, respectively [16]. The sample of M-0 and M-100 were evaluated in detail, the results can be seen in Figure 7.…”

“…The dopant of sulfate [10], platinum complex [11], bismuth [12], molybdenum [13], nickel [14], and lanthanum [15] could be applied in Ag3PO4. The metallic silver dopant on Ag3PO4 is the most promising because it can be created through a simple reduction of Ag + ions [16]. This dopant could also generate the surface plasmon resonance that leads to a highly active photocatalyst [17].…”