“…Thus, a high degree of agglomeration can promote a decrease in the surface area of the particles and consequently, a reduction in the performance of the photocatalytic activity. 45,53,54 The elemental analysis of the samples was determined from energy-dispersive X-ray spectroscopy (EDS) spectra to confirm the presence of copper and magnesium elements in the ZnO lattice. For the ZnO sample, zinc and oxygen peaks were observed.…”
Section: Resultsmentioning
confidence: 99%
“…The surface area plays a key role in photocatalytic applications, where its increase generates a greater area of direct contact, increasing its photocatalytic efficiency. Thus, a high degree of agglomeration can promote a decrease in the surface area of the particles and consequently, a reduction in the performance of the photocatalytic activity 45,53,54 …”
Pure ZnO particles, doped and co‐doped with Cu2+ and Mg2+ ions were obtained by the simple sonochemical method. The wurtzite hexagonal structure was confirmed by X‐ray diffraction (XRD) patterns. The images obtained by field emission scanning electron microscopy (FE‐SEM) showed irregular and more agglomerated particles with the increase of Cu2+ and Mg2+ ions concentration in the ZnO lattice, with the average diameter of particles in the range of 57.23‐170.77 nm. The photocatalytic activity was investigated by decolorizing the methylene blue (MB) dye under UVC light irradiation which indicates that 1% Mg‐doped ZnO particles have better photocatalytic activity than the other samples, and presented the highest kinetic constant value. The co‐doped samples showed a reduced global surface area which did not favor the good photocatalytic performance. The sacrificial agents showed that OH· radicals are the main species involved in the photocatalytic activity of this system and defects generated in the ZnO lattice promoted photoluminescent emission in the red and green regions.This article is protected by copyright. All rights reserved
“…Thus, a high degree of agglomeration can promote a decrease in the surface area of the particles and consequently, a reduction in the performance of the photocatalytic activity. 45,53,54 The elemental analysis of the samples was determined from energy-dispersive X-ray spectroscopy (EDS) spectra to confirm the presence of copper and magnesium elements in the ZnO lattice. For the ZnO sample, zinc and oxygen peaks were observed.…”
Section: Resultsmentioning
confidence: 99%
“…The surface area plays a key role in photocatalytic applications, where its increase generates a greater area of direct contact, increasing its photocatalytic efficiency. Thus, a high degree of agglomeration can promote a decrease in the surface area of the particles and consequently, a reduction in the performance of the photocatalytic activity 45,53,54 …”
Pure ZnO particles, doped and co‐doped with Cu2+ and Mg2+ ions were obtained by the simple sonochemical method. The wurtzite hexagonal structure was confirmed by X‐ray diffraction (XRD) patterns. The images obtained by field emission scanning electron microscopy (FE‐SEM) showed irregular and more agglomerated particles with the increase of Cu2+ and Mg2+ ions concentration in the ZnO lattice, with the average diameter of particles in the range of 57.23‐170.77 nm. The photocatalytic activity was investigated by decolorizing the methylene blue (MB) dye under UVC light irradiation which indicates that 1% Mg‐doped ZnO particles have better photocatalytic activity than the other samples, and presented the highest kinetic constant value. The co‐doped samples showed a reduced global surface area which did not favor the good photocatalytic performance. The sacrificial agents showed that OH· radicals are the main species involved in the photocatalytic activity of this system and defects generated in the ZnO lattice promoted photoluminescent emission in the red and green regions.This article is protected by copyright. All rights reserved
“…The morphology and properties of AW are very dependent on the synthesis method and reaction conditions, such as pH, temperature, and so on. 28 For most of the applications, it is vital to have a tight control over the morphology taken by the crystals because catalytic reactions occur on the surface of semiconductors, making them surface-dependent processes. Then, tuning of the surface and morphology of efficient catalysts by controlled synthesis has become a key issue in realizing the full potential of this application.…”
Here, we present the synthesis of a highly efficient V-doped α-Ag2WO4 catalyst for the oxidation of sulfides to sulfones, exhibiting a high degree of tolerance towards various sensitive functional groups.
“…α-Ag 2 WO 4 is a representative member of Ag-based complex oxides and, due to its unique properties, is employed in a wide range of applications such as catalysts, photocatalysts, electrocatalysts, photoluminescent, sensors, adsorbents of dyes, and antimicrobial and bactericidal agents [1][2][3][4]. α-Ag 2 WO 4 has been prepared by using different methods, such as simple precipitation [5], controlled precipitation (CP) [6], chemical precipitation [7], coprecipitation at different temperatures [8], coprecipitation followed by microwave irradiation [9], conventional hydrothermal methods [10,11], microwave-assisted hydrothermal (MAH) methods [12], simple electrochemical methods [13], simple ion exchanges at room temperature [14], and sonochemical (SC) methods [15].…”
Size and morphology control during the synthesis of materials requires a molecular-level understanding of how the addition of surface ligands regulates nucleation and growth. In this work, this control is achieved by using three carboxylic acids (tartaric, benzoic, and citric) during sonochemical syntheses. The presence of carboxylic acids affects the kinetics of the nucleation process, alters the growth rate, and governs the size and morphology. Samples synthesized with citric acid revealed excellent photocatalytic activity for the degradation process of Rhodamine B, and recyclability experiments demonstrate that it retains 91% of its photocatalytic activity after four recycles. Scavenger experiments indicate that both the hydroxyl radical and the hole are key species for the success of the transformation. A reaction pathway is proposed that involves a series of dissolution−hydration–dehydration and precipitation processes, mediated by the complexation of Ag+. We believe these studies contribute to a fundamental understanding of the crystallization process and provide guidance as to how carboxylic acids can influence the synthesis of materials with controlled size and morphology, which is promising for multiple other scientific fields, such as sensor and catalysis fields.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.