Synthesis of Ag–ZnO with multiple rods (multipods) morphology and its application in the simultaneous photo-catalytic degradation of methyl orange and methylene blue

Chamjangali, Mansour Arab; Bagherian, Ghadamali; Javid, Allahbakhsh; Boroumand, Samira; Farzaneh, Nahid

doi:10.1016/j.saa.2015.05.067

Cited by 65 publications

(25 citation statements)

References 57 publications

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“…Figures 2b and 3b are the O 1s spectra, the feature peaks are 526.9 eV and 530.4 eV, which are related to the lattice oxygen of nanocomposite (the bond of Zn-O). Figure 2c is the spectrum of Ag 3d of Ag in Ag/ZnO, the two peaks are at 370.1 eV and 364.1 eV, with a gap of 6.0 eV, which is assigned to the metallic Ag 0 species [39]. Figure 3c shows the spectrum of Ag 3d and the two peaks are located at 373.8 eV and 367.8 eV, which should be attributed to Ag 3d 5/2 and Ag 3d 3/2 , belonging to Ag + [40].…”

Section: Xpsmentioning

confidence: 99%

“…The presence of the reactive oxygen species were validated by quenching experiments. The common reactive oxygen species and their quenchers are OH and isopropanol (10 mM), O 2 − and benzoquinone (0.5 µM), photogenerated holes (h + ) and EDTA disodium (5 mM), 1 O 2 and sodium azide (0.5 µM) [39], respectively. Figure 14 shows the results of the quenching experiments.…”

Section: Validating the Presence Of Reactive Oxygen Speciesmentioning

confidence: 99%

“…Owing to the existence of an accumulation layer [59], the photoelectron transmission process from ZnO to Ag is boosted, so that the recombination of photoelectron-hole pairs is reduced in Ag/ZnO, thus the OH generation is promoted. Moreover, the surface plasmon resonance (SPR) of Ag also improves the utilization of light energy and the efficiency of electronic transmission [39]. Noticeably, as shown in Figure 16b, since the Fermi levels of AgI and ZnO are close to their VB, comparing to Ag/ZnO, when the electronic transfer of the two interfaces is balanced, the direction of band bending in AgI and ZnO is opposite, resulting in discontinuous energy edges [57,58].…”

Section: Proposed Photocatalytic Mechanismmentioning

confidence: 99%

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

Ding,

Fu,

Pan

et al. 2020

Catalysts

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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.

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Section: Xpsmentioning

confidence: 99%

Section: Validating the Presence Of Reactive Oxygen Speciesmentioning

confidence: 99%

Section: Proposed Photocatalytic Mechanismmentioning

confidence: 99%

See 1 more Smart Citation

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

Ding,

Fu,

Pan

et al. 2020

Catalysts

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show abstract

“…For this purpose, a series of experiments are carried out by employing different concentrations ranging from 0.05 to 0. The explanation of this behaviour can be the fact that an increase in the amount of photocatalysts up to a certain amount causes an increase in the number of active sites on the semiconductor surface and in turn an increase in the number of electron-hole pairs generated during irradiation [51].…”

Section: Photocatalytic Studiesmentioning

confidence: 99%

Photosensitization effect on visible-light-induced photocatalytic performance of $$\hbox {TiO}_{2}$$/chlorophyll and flavonoid nanostructures: kinetic and isotherm studies

2019

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Preparation and performance of natural dye-sensitized photocatalysts of TiO 2 are described in this study. Such sensitized nanostructures offer visible-light-reactive systems for the photodegradation of organic pollutants. Natural pigments of chlorophyll and flavonoid extracted from parsley leaves and Curcuma longa roots are grated on TiO 2 nanoparticles as photosensitizers using an incipient wetness impregnation method. The as-prepared samples are structurally characterized by combined techniques, such as X-ray diffraction, scanning electron microscopy and Fourier transform infrared. The diffuse reflectance UV-Vis spectra are also used to investigate band-gap energies. The resultant band-gap energies confirm the ability of visible light absorption and thereby the ability of more efficient generation of photoexcited charge-carriers. The photocatalytic performance of dye-sensitized nanoparticles is tested in terms of decolourization efficiency of MB dye as a function of involved operating parameters including reaction time, amount of catalyst, initial MB concentration and pH. Both samples show the excellent photocatalytic efficiencies relevant to the red shift generated and high absorption of photons in the visible region. However, the highest efficiency is obtained for TiO 2 /chlorophyll catalysts (93%) compared to TiO 2 /flavonoid samples (91%), which is perfectly in agreement with their band-gap energies and visible-light absorption ability. Photodegradation process kinetics is investigated by the Langmuir-Hinshelwood model, while the adsorption equilibrium is described based on Langmuir and Freundlich isotherms.

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“…Since no complete removal of pharmaceuticals in wastewater by existing wastewater treatment technologies is possible , it is demanding to develop new and/or improved existing technologies for effective removal of pharmaceuticals. Many techniques were applied in the remediation of pharmaceuticals from aqueous medium, including photocatalytic degradation , membranes , ozonation , Fenton process , electrochemical techniques , reverse osmosis , chemical precipitation , advanced oxidation processes , adsorption , etc. Scientists have studied the adsorption and remediation of pharmaceuticals using several adsorbents .…”

Section: Introductionmentioning

confidence: 99%

Fixed‐Bed and Batch Adsorption of Pharmaceuticals from Aqueous Solutions on Ionic Liquid‐Modified Montmorillonite

Lawal

Moodley

2018

Chem Eng & Technol

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Batch and column adsorption of four pharmaceuticals, namely, tetracycline (TC), sulfamethoxazole (SMZ), nalidixic acid (NAD), and chloramphenicol (CHL) on ionic liquid modified montmorillonite (Mt‐IL) was evaluated. The effects of variation in pH and contact time were analyzed and the data were fitted to kinetics and isotherm models. The equilibrium experimental data were best explained by the Freundlich model. A pseudo second‐order kinetic model described all pharmaceuticals adsorbed on Mt‐IL. In column studies, the exchange zone depth, adsorption capacity, the required time for the pharmaceuticals to move through the height of the adsorbent in the column, and adsorption rates were investigated by the Yoon‐Nelson and the Thomas and Adams‐Bohart models.

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Synthesis of Ag–ZnO with multiple rods (multipods) morphology and its application in the simultaneous photo-catalytic degradation of methyl orange and methylene blue

Cited by 65 publications

References 57 publications

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

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

Photosensitization effect on visible-light-induced photocatalytic performance of $$\hbox {TiO}_{2}$$/chlorophyll and flavonoid nanostructures: kinetic and isotherm studies

Fixed‐Bed and Batch Adsorption of Pharmaceuticals from Aqueous Solutions on Ionic Liquid‐Modified Montmorillonite

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