A Facile synthesis of silver modified ZnO nanoplates for efficient removal of ofloxacin drug in aqueous phase under solar irradiation

Kaur, Amandeep; Gupta, Girish; Ibhadon, Alex O.; Salunke, Deepak B.; Sinha, Asha; Kansal, Sushil Kumar

doi:10.1016/j.jece.2017.05.032

Cited by 66 publications

(9 citation statements)

References 52 publications

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“…Doping of ZnO with noble metals such as Si, Cu, Pd, Ag, and Au has shown improvement in its charge separation and visible light optical absorption. Among these metals, silver has gained importance by showing strong absorption of visible light and inhibition of electron-hole recombination through surface plasmon resonance (Kaur et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Ramasamy¹,

Jeyanthi²,

Chinnaiyan

2021

Environ Sci Pollut Res

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This study is on photocatalytic degradation of pharmaceutical residues of atenolol (ATL) and acetaminophen (ACT) present in secondary effluent under visible light irradiation stimulated by Ag doped ZnO (Ag-ZnO) photocatalyst. Lawsonia inermis leaf extract was used for reduction of Zinc sulphate to ZnO nanoparticles (NPs). Further, ZnO NPs were doped with Ag and characterized by XRD, FT-IR, SEM-EDX, surface area analyzer, UV-Vis, and photoluminescence spectrometry to analyze the structure, morphology, chemical composition, and optical property. FT-IR analysis revealed major functional groups such as OH, C=O, and SEM analysis depicted the polyhedron shape of the NPs with size range of 100 nm. Ag-ZnO NPs were used in the photocatalytic degradation of ATL and ACT, and its removal was evaluated by varying initial contaminant concentration, catalyst dosage, and initial pH. Findings indicate that Ag-ZnO NPs demonstrated relative narrow bandgap and efficient charge separation that resulted in enhanced photocatalytic activity under visible light illumination. The photocatalytic degradation of ATL and ACT fitted well with pseudo-first-order kinetic model. Further, it was found that under optimal conditions of 5 mg/L of contaminants, pH of 8.5, and catalyst dose of 1 g/L, degradation efficiency of 70.2% (ATL) and 90.8% (ACT) was achieved for a reaction time of 120 min. More than 60% reduction in TOC was observed for both contaminants and OH• pathway was found to be the major removal process. Ag-ZnO photocatalyst showed good recycling performance, and these findings indicate that it could be cost effectively employed for removing emerging contaminants under visible light radiation. Supplementary Information The online version contains supplementary material available at 10.1007/s11356-021-13532-2.

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Section: Introductionmentioning

confidence: 99%

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Ramasamy¹,

Jeyanthi²,

Chinnaiyan

2021

Environ Sci Pollut Res

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“…which are indexed as (2 2 0), (6 0 0), (0 0 6), (6 3 0), and 7 1 3, respectively [14]. The peak which appears at 28.6° and 38.4° is belonging to (1 1 1) plane of Si and Au [15,16], respectively, along with peak of ZnO at 34.6° having (0 0 2) plane [17]. It is observed that substrate and pre-deposited gold shows maximum intensity in all the samples which is attributed to the thin porous layer deposited over the substrate.…”

Section: Methodsmentioning

confidence: 99%

Thermoelectric Properties of Oxide Semiconductors

Nabi¹,

Ali²,

Arshad³

et al. 2019

Solid State Physics [Working Title]

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In this chapter, we have explored the potential of oxide semiconductors for thermoelectric power generation. Various oxides (Cu 2 InO 4 , CuAlO 2 , and Zn 2 GeO 4) were grown on Si substrate by thermal evaporation method using tube furnace. After the growth, a representative sample of each oxide was cut into pieces and was annealed at various temperatures from 600 to 800°C in oxygen environment for 1 h using a programmable furnace. The structure of all annealed sample was verified by performing X-ray powder diffraction (XRD) measurements. XRD data suggested that all oxide materials show crystalline behavior at annealing temperature 800°C. XRD results further confirmed that crystal structure of investigated samples improved significantly with annealing because the intensity of oxygen-sensitive (0 0 6) plane was found to be increased with annealing temperature. To investigate the thermoelectric properties of annealed samples, Seebeck effect and Hall effect measurements were performed in the temperature range 25-100°C. It was found that the value of Seebeck coefficient and power factor increased as the annealing temperature increases. Zn 2 GeO 4 was found to be a potential thermoelectric material because it has the highest value of Seebeck coefficient and power factor. This highest value is related to the presence of secondary phases in this oxide.

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“…Figure 5a). The hν values were plotted against (αhν) 2 and extended to calculate the band gap energy of the as-prepared samples by the Tauc's method [35], the results are presented in Figure 5b. The band gap energies of the ZnO, ZnO•AC, Ag•ZnO, and Ag•ZnO•AC were 3.16, 3.08, 3.04 and 3.01, respectively.…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

Synthesis of Nano-Flakes Ag•ZnO•Activated Carbon Composite from Rice Husk as A Photocatalyst under Solar Light

Pham

Tran

et al. 2020

Bull. Chem. React. Eng. Catal.

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This study aimed to synthesize Ag•ZnO•Activated carbon (Ag•ZnO•AC ) composite from rice husk for degradation of dyes. The deposition of Ag and ZnO on AC led to decreasing the surface area and pore volume of Ag•ZnO•AC composite. In addition, when Ag and ZnO were dispersed on activated carbon, the Ag•ZnO flakes became denser and tighter, but the particle size of Ag became smaller from 5 to 7 nm. The photocatalytic ability of Ag•ZnO•AC composite was evaluated by degradation of Janus Green B (JGB) and compared with that of AC, ZnO, Ag•ZnO, and ZnO•AC samples. The effects of catalyst dosages, pH values, and initial dye concentrations on photocatalytic degradation were investigated in detail. The Ag•ZnO•AC composite had a high degradation efficiency of 100% in 60 min, showing the reaction rate of 0.120 min-1 and degradation capacity of 17.8 mg/g within 20 min. The photocatalytic performance of the Ag•ZnO•AC composite was also evaluated by cyclic test and the degradation of other persistent dyes such as Methylene Blue, Tartrazine, Congo Red, and organic compounds (Caffeine and Bisphenol A). Based on the experimental results, the possible destruction route of JGB by the as-synthesized Ag•ZnO•AC composite was suggested. Copyright © 2020 BCREC Group. All rights reserved

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A Facile synthesis of silver modified ZnO nanoplates for efficient removal of ofloxacin drug in aqueous phase under solar irradiation

Cited by 66 publications

References 52 publications

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Novel organic assisted Ag-ZnO photocatalyst for atenolol and acetaminophen photocatalytic degradation under visible radiation: performance and reaction mechanism

Thermoelectric Properties of Oxide Semiconductors

Synthesis of Nano-Flakes Ag•ZnO•Activated Carbon Composite from Rice Husk as A Photocatalyst under Solar Light

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