Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole

Abstract

Ag and AgI-modified ZnO composites (Ag/ZnO and AgI/ZnO) were synthesized in facile ways. The photocatalysts were used for the photodegradation of metronidazole (MNZ) under the irradiation of simulated sunlight. The results of experiments showed that both Ag/ZnO and AgI/ZnO had a specific molar ratio to reach the best performance. Ag/ZnO performed better in the photodegradation of MNZ than AgI/ZnO under the same conditions. The reaction rate constant of AgI/ZnO was less affected by the variation of initial concentration of MNZ or pH values. The main reactive oxygen species of the photocatalytic process are OH, O2− and h+, but the free radicals which play the most critical part differ in Ag/ZnO and AgI/ZnO. Several intermediates were revealed by LC–MS/MS analysis. The stability of the photocatalysts was evaluated by a series of repeated MNZ photodegradation experiments. The results showed that AgI/ZnO had better stability than Ag/ZnO.

Analysis of Iodide Transport on Methyl Ammonium Lead Iodide Perovskite Solar Cell Structure Through Operando Hard X-ray Photoelectron Spectroscopy

“…The SP_2 sample spectra consist of only one main peak located at 619.1 eV, as clearly identified from Figure d. We ascribed this chemical state to the presence of the AgI interlayer. − Basically, it is unexpected to observe the existence of the AgI compound from the SP_2 sample because of the presence of an ITO barrier layer. In other words, halide species should not be able to directly reach the Ag layer and create an AgI structure as in the case of the SP_1 sample without an ITO barrier.…”

Improved the Light Adsorption and Separation of Charge Carriers to Boost Photocatalytic Conversion of CO2 by Using Silver Doped ZnO Photocatalyst

“…ZnO had a uniform nanorod shape, while the surface of Ag-ZnO contained some small nanoparticles loading onto the nanorods of ZnO. The result from SEM analysis confirmed that the silver nanoparticles were loaded over ZnO [13,21,25].…”

“…The hetero-structuralized ZnO is the highest method used for CO 2 reduction at 36%, followed by defect-engineered ZnO (32%), plasmonic metal-loaded ZnO (18%), and 14% assigned to the doped ZnO. Therefore, the development method for doping ZnO is interesting to extend the application of ZnO-based photocatalyst for the conversion of carbon dioxide [11,13,15,18,20,21].…”

In situ fabrication and design of a novel electrochemical sensor based on the Ag3.84Sn3S8@rGO nanocomposite for competitive ultra-detection of metronidazole in human urine

“…S1-S7). [43][44][45] Fig. 6 (a) Photocurrent study (b) time dependent photocatalytic performance comparison of performances of Ag 3.84 Sn 3 S 8 @rGO 0.25 with (c) different catalysts (d) as synthesized catalysts…”