A hierarchical Ca/TiO₂/NH₂-MIL-125 nanocomposite photocatalyst for solar visible light induced photodegradation of organic dye pollutants in water

Abstract

In this study, for the first time, the Ca/TiO2/NH2-MIL-125 nanocomposite photocatalyst was synthesized for the purpose of photodegradation of Methyl Orange (MO) and Rhodamine B (RhB) dyes under visible light irradiation.

Synthesis of modified beta bismuth oxide by titanium oxide and highly efficient solar photocatalytic properties on hydroxychloroquine degradation and pathways

“…FESEM images distribute the presence of spherical β-Bi 2 O 3 nanoparticles evenly on the surface of TiO 2 particles. As can be seen, the particles using this preparation method are somewhat accumulated, which this accumulates may be attributed to the evaporation of organic matter adsorbed on the nanoparticle surface and structural changes as well as the lack of sonicates of the samples before imaging [5] . It can be concluded that, under the current path, bismuth metal nanoparticles are formed by hydrothermal reaction and after the calcination is completely transformed into TiO 2 /β-Bi 2 O 3 composite nanoparticles.…”

“…AFM analysis is possible to determine the roughness and predicted surface parameters of TiO 2 /β-Bi 2 O 3 layers. Figure [5] shows an AFM micrograph of the surface of TiO 2 /β-Bi 2 O 3 layers. As can be seen, the surface of the TiO 2 /β-Bi 2 O 3 layers with Ra=152nm and Rq=191nm show a calculated surface area of 1.318 μm.…”

“…The light used in the experiment was solar light and UV-A light. The batch photocatalytic system in this study was exposed to direct sunlight with an intensity of 76-72 kW and UV-A light with a light density of 6 W. The parameters studied in this experiment include pH different [3] , [5] , [7] , concentration of TiO 2 /β-Bi 2 O 3 nanocomposite as a catalyst (0.05, 0.1, 0.3, 0.4 g/L), hydroxychloroquine concentration (1, 10, 20, 40 mg/L), H 2 O 2 concentration (1,2, 3, 4 mg.L -1 ), temperature (10, 20, 40, and 60 ˚C) and irradiation time (5,10,15,20,30,45,60,90,120min). (0.1 M) HCl and (0.1 M) NaOH were used to adjust the pH, and a magnetic stirrer at 70 rpm was used to blend the system.…”

“…Various technologies such as activated carbon adsorption, reverse osmosis, filtration, and biological methods are used to remove drugs. However, the results indicated that the use of the above methods causes the transfer of contaminants from one phase to another, their concentration, and finally the production of a new contaminant that requires further treatment [5] . Advanced oxidation (AOPs) is one of the most popular processes that is widely accepted today due to the low-cost and simplicity of the process to remove resistant organic pollutants [6] .…”

Photocatalytic and Antibacterial Properties of Ag-CuFe2O4@WO3 Magnetic Nanocomposite

“…Over pH 6.2, the photodegradation efficiency decreases due to a lower density of the hydroxyl radicals, thus a less oxidation potential [ 46 ]. Another reason for the lower photodegradation efficiency under alkaline conditions is the formation of insoluble compounds in the media, which hampers light penetration and thereby leads to a reduction in generation of the hydroxyl radicals [ 47 , 48 ].…”