Photodegradation under UV Light Irradiation of Various Types and Systems of Organic Pollutants in the Presence of a Performant BiPO4 Photocatalyst

Abstract

In this study, we prepared spheroid microstructures of monoclinic bismuth phosphate BiPO4 by a facile solid-state reaction at 500 °C. The crystal structure was refined using the Rietveld method, where the crystal cell was resolved using a monoclinic system (parameters a, b, c, β) with space group P21/n. SEM images showed that the solid catalyst presented homogeneous morphologies. These BiPO4 microparticles (BiP-500) have been used as photocatalysts to photodegrade, under UV light irradiation, three cationic dyes (Rhodamine B, RhB; Methylene Blue, MB; and Toluidine Blue, TB), three anionic dyes (Congo Red, CR; Orange G, OG; and Methyl Orange, MO) and mixtures of RhB-MB, RhB-OG and MO-OG organic dyes. The photodegradation efficiency of these BiP-500 microparticles is found to be optimal in the case of RhB solutions, RhB-MB and RhB-OG binary mixtures. The BiP-500 catalyst shows a high selectivity for the conversion of the mixture of dyes into CO2 and H2O. Total organic carbon analysis of an anionic dye and a cationic dye (RhB, OG and RhB-MB) confirms the mineralization of the pollutants in the presence of BiP-500 particles. The photocatalytic efficiency of our BiP-500 photocatalyst has been confirmed, with a view to facilitate applications in the field of the depollution of wastewater in the agricultural environment by the degradation of parathion-methyl (PM) as a pollutant.

Low-temperature synthesis, characterization and photocatalytic properties of lanthanum vanadate LaVO4

“…To explain photocatalytic degradation efficiency of MB, we have determined the pH pzc (pH at the zero charge point) Fig. 6 d The zero charge point depends on acid-base characteristic of surface material [ 70 ]. In our case the tetragonal LaVO 4 has PZC at pH 6.49 and MB is a cationic dye.…”

Morphology and Performance of PolyVinyl Chloride Thin Films Doped with Polyorganosilanes against Photodegradation

“…Additionally, to reduce the process of photo-degradation to the building units of carbohydrates chains within the polymer [19]. e. X-ray Mapping X-ray images of PVC and organosilane polymers (1-3) are displayed in gures (9)(10)(11)(12) respectively, showing the distributions of the elements and their relative abundance in PVC lms [15]. Long-term exposure of PVC membranes to UV light causes dechlorination which results in hydrochloride production from the polymer chains and hence the abundance of chlorine inside PVC lms [20,21].…”

“…On the other hand, the honeycomb/non-porous morphology is of particular importance because it provides better mechanical toughness, a better charge absorber, and has a lower density with a larger diffusion coe cient [9]. Many recent technology applications can modify Honeycomb's distinctive features [10]. The current project deals with the use of polyorganosilanes to stabilize PVC against the negative effects of the irradiation process.…”

Photo Degradation of Solochrom Violet Dye by ZnO: Experimental and Theoretical Study

“…Textile wastewater contains significant amounts of heat, high acidity, and other soluble compounds. Pollutants in cloth effluent were primarily produced during dyeing and finishing processes [7][8] . Various municipal and industrial wastewaters, including chemicals, have been treated using different treatment processes, including physical, chemical, and biological 9 .…”