Synthesis and visible light photocatalytic properties of iron oxide–silver orthophosphate composites

Bull. Chem. React. Eng. Catal.

Soleh

Amal

et al. 2018

Self Cite

The highly active photocatalyst of Ag3PO4 could be synthesized under ammonia solution using the facile co-precipitation method with the starting material of AgNO3 and Na2HPO4.12H2O. The variation of ammonia concentration was designed at 0.00, 0.05, 0.15, and 0.30 M. The products were characterized using X-ray diffraction, UV-diffuse reflectance spectroscopy, and scanning electron microscopy. The photocatalytic activities were evaluated using the Rhodamine B degradation under blue light irradiation. The effect of calcination, pH condition, and visible light source irradiation was carried out in the experiment. The highest photocatalytic activity was found in the sample prepared using the addition of ammonia solution at the concentration of 0.05 M. This photocatalytic activity was 4.13 times higher compared to the Ag3PO4 prepared without the ammonia. The effective condition of photocatalytic activity was achieved at the sample prepared without calcination, degradation at pH of 7 and under blue light irradiation. dye removal. Silver orthophosphate has the band gap energy of 2.36 eV, that can absorb solar energy shorter than ~530 nm [1-6], possess stronger photo-oxidative capability than the previous photocatalyst [7-9], generating O2 from water splitting with a quantum efficiency nearly 90% in visible light irradiation [10]. In order to improve its photocatalytic activity in the visible light region, many approaches have been performed especially in catalyst fabrication design

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Ag3PO4 Photocatalyst with Varied Ammonia Concentration and Its Photocatalytic Activities For Dye Removal

Bull. Chem. React. Eng. Catal.

Soleh

Amal

et al. 2018

Self Cite

“…The radical species test on the MB photodegradation can be determined by using radical trappers such as pbenzoquinone (BQ), isopropanol alcohol (IPA), and ammonium oxalate (AO) for superoxide (•O2), hydroxyl (•OH), and hole (h + ) radicals (Febiyanto et al, 2016), respectively.…”

Section: Photocatalyst Mechanismmentioning

confidence: 99%

“…This is caused by its high quantum yield (the amount of reactant consumed to the amount of photon absorbed using photocatalyst) of more than 90%. It can absorb visible light lower than 530 nm with band gap energy of 2.2-2.5 eV, and high photooxidation ability under visible light illumination (Joo, 2006;Yi et al, 2010;Bai et al, 2013;Hewer et al, 2014;Luo et al, 2014;Sulaeman et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of H2O2 Addition on the Photocatalyst Properties of Ag3PO4 for Methylene Blue Photodegradation

Amal

2021

WJC

In this work, a facile enhanced property of Ag3PO4 photocatalyst using H2O2 for methylene blue photodegradation has been conducted. Ag3PO4 photocatalyst was synthesized using the co-precipitation method. Then, the photocatalytic activity and stability of Ag3PO4 were tested in the methylene blue degradation under the addition of an H2O2 30% solution. According to the results, the prolonged photocatalysis reaction led to a decrease in the catalysis ability of the Ag3PO4 photocatalyst. Meanwhile, the addition of 5 mL of H2O2 (AH-10% sample) tends to enhance the stability of Ag3PO4 photocatalyst with the dye removal percentage and recycling test were up to 90.3% and three recycle runs, respectively. The low stability of Ag3PO4 might be due to the catalyst photo-corrosion through Ag+ reduction. This research suggests that H2O2 is beneficial to inhibit the photo-corrosion of Ag3PO4 photocatalyst, even though released Ag ions that were caused by the excess addition of H2O2 oxidizing agent should be considered.

“…After that, the suspension was irradiated under blue light, and the sample was drawn ±5 mL at a certain time. The suspension was centrifuged at 1.500 rpm, and the absorbance of the filtrate was measured (Febiyanto et al, 2016).…”

Section: Photocatalytic Activity Analysismentioning

confidence: 99%

The Starting Material Concentration Dependence of Ag3PO4 Synthesis for Rhodamine B Photodegradation under Visible Light Irradiation

Sulaeman

2020

Valensi

Synthesis of Ag3PO4 photocatalyst under the varied concentrations of AgNO3 and Na2HPO4·12H2O as starting material has been successfully synthesized using the co-precipitation method. The concentration of AgNO3 is 0.1; 0.5; 1.0; and 2.0 M, whereas Na2HPO4·12H2O is 0.03; 0.17; 0.33; and 0.67 M, respectively. The co-precipitations were carried out under aqueous solution. As-synthesized photocatalysts were examined to degrade Rhodamine B (RhB) under blue light irradiation. The results showed that varying concentrations of starting materials affect the photocatalytic activities, the intensity ratio of [110]/[200] facet plane, and their bandgap energies of Ag3PO4 photocatalyst. The highest photocatalytic activity of the sample was obtained by synthesized using the 1.0 M of AgNO3 and 0.33 M of Na2HPO4·12H2O (AP-1.0). This is due to the high [110] facet plane and increased absorption along the visible region of AP-1.0 photocatalyst. Therefore, this result could be a consideration for the improvement of Ag3PO4 photocatalyst.