Increase of antimicrobial and photocatalytic properties of silver-doped PbS obtained by sonochemical method

Abstract

In this work, pure PbS powders doped with silver were obtained in the proportions of 1, 2, 4 and 8 mol% by sonochemical method. Powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV-Vis spectroscopy (UV-Vis) and EPR analysis. The photocatalytic properties were estimated by degradation of methylene blue dye. The antimicrobial properties were studied by the formation of inhibition halos against Escherichia coli and Staphylococcus aureus bacteria and Candida albicans yeast. XRD patterns show that PbS, with a cubic structure, was obtained without the formation of secondary phases. FE-SEM analysis indicates loss of the cubic aspect of PbS samples as the Ag + concentration increases and particle size reduces. The defects generated by the substitution of Pb 2+ by Ag + increase the photocatalytic activity, where PbS and P8A samples reduced by 25% and 68%, respectively, the MB concentration and significantly increased the antimicrobial activity against E. coli and S. aureus bacteria and C. albicans yeast.

Photoluminescent and photocatalytic properties of Cu2+ and Mg2+‐doped ZnO nanoparticles obtained by a facile sonochemical method

“…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.…”

“…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 …”

Influence of doping with Sm3+ on photocatalytic reuse of ZnO thin films obtained by spin coating

“…The reduction in intensity occurred along with increasing the mean peak height width. This fact is associated with a reduction in crystallite size [18]. For more information on crystallite size, the Scherrer's equation was used, as shown in equation 2 [19].…”

Antimicrobial and electrical properties of ce‐ and ni‐doped zns nanoparticles obtained by a sonochemical method

“…The antimicrobial capacity has been studied in several semiconductor materials, which include oxides and sulfides 4‐6 . Among these materials, ZnS stands out for being stable, non‐toxic, and still absorb UV radiation 7 .…”