Doping nano-Co3O4 surface with bigger nanosized Ag and its photocatalytic properties for visible light photodegradation of organic dyes

Chen, Guangliang; Si, Xiaolei; Yu, Jing; Bai, Huiyu; Zhang, Xianhui

doi:10.1016/j.apsusc.2015.01.011

Cited by 60 publications

(20 citation statements)

References 45 publications

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“…Higher concentration of Ag block the active center of TiO 2 , therefore, the photocatalytic activity decreased at higher Ag loading. Hence, 6% loading of Ag was considered as optimum loading [38,39]. It is proposed that heterogeneous photocatalytic degradation reaction takes place through the creation of positive hole (h VB + ) in valence band and photo excited electron (e CB − ) in the conduction band of catalyst by irradiation.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Azadirachta indica leaves extract assisted green synthesis of Ag-TiO2 for degradation of Methylene blue and Rhodamine B dyes in aqueous medium

Saeed

Muneer

Khosa

et al. 2019

Green Processing and Synthesis

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Aqueous pollution due to textile industry is an important issue. Photocatalysis is one of the methods used for eradication of dyes from textile industrial effluents. In this study, the synthesis, characterization and evaluation of photo catalytic activity of Ag-TiO2 is reported. TiO2 catalysts with 2, 4, 6 and 8% loading of Ag were prepared by green methods using Azadirachta indica leaves extract as reducing agent with titanium dioxide and silver nitrate as precursor materials. Prepared catalyst was characterized by advanced techniques and was used as catalyst for degradation of Methylene blue and Rhodamine B dyes. Deposition of Ag greatly enhanced the catalytic efficiency of TiO2 towards degradation of dyes. Irradiation of catalyst excites electrons from conduction band of catalyst to valence band yielding an electron-hole pair. This electron-hole pair undergoes secondary reactions and produce OH∙ radicals. These active radicals take part in degradation of dyes. More than 90% dyes were degraded in 120 min. Photo catalytic degradation of Methylene blue and Rhodamine B followed Eley-Rideal mechanism which states that dye react in fluid phase with adsorbed oxygen.

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Section: Photocatalytic Activitymentioning

confidence: 99%

Azadirachta indica leaves extract assisted green synthesis of Ag-TiO2 for degradation of Methylene blue and Rhodamine B dyes in aqueous medium

Saeed

Muneer

Khosa

et al. 2019

Green Processing and Synthesis

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show abstract

“…Generally, the doped semiconductor shows higher activity than the undoped counterpart owing to the introduction of localized state above the valence band (Pan et al, 2013;Chen et al, 2015;Ruzimuradov et al, 2015).…”

Section: Crystalline Structure Effectmentioning

confidence: 96%

Photocatalytic Reactors Dedicated to the Degradation of Hazardous Organic Pollutants: Kinetics, Mechanistic Aspects, and Design – A Review

Zeghioud

Khellaf

Djelal

et al. 2016

Chemical Engineering Communications

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International audienceIn recent years, heterogeneous photocatalysis has emerged as a new effective, powerful, clean, and safe decontamination technology for the treatment of organic pollutants and the transformation of hazardous chemicals into different forms. This review focuses on the recent development of various conventional technologies of reactors designated for the photodegradation of hazardous organic pollutants with their limitations. This phenomenon is strongly influenced by reaction conditions such as temperature of reaction, pH, light intensity and wavelength, pollutant concentration, photocatalyst quantity, relative humidity (RH), and other parameters. The catalyst photoactivity depends on the structural characteristics of the semiconductor, its morphology, and its particles size. This paper presents the progression of photocatalytic reactors for synthetic dyes degradation with special consideration to the use of supported photocatalyst and nanostructured titanium supported over volcanic ashes, owing to the major advantage of an easy separation of the catalyst when compared to homogenous system, namely suspended catalyst. In addition, special attention was paid to the literature dealing with the promotion of light efficiency by testing various light sources. © 2016, Copyright © Taylor & Francis Group, LLC

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“…To confirm that the NPs are nanocrystals, high-resolution TEM images were taken from a round and an elliptical Ag NPs, as shown in Figure 4d and Figure S2. They show the same lattice structure, with a lattice distance of approximately 0.24 nm, corresponding to the Ag (111) lattice plane, 33 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 The sizes of the Ag NPs prepared at different AgNO 3 concentrations were evaluated from TEM images and summarized in Figure 6a. Figure 7a shows that the compressive stresses (σ c ) are mostly more than 1 MPa at a compressive strain (ε c ) of 95%.…”

Section: Characterization Of Phema/ag Nps Composite Hydrogels When Amentioning

confidence: 97%

Biomimetic Nanowire Structured Hydrogels as Highly Active and Recyclable Catalyst Carriers

Mao

Shi

Wang

2015

ACS Sustainable Chem. Eng.

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Nanowire hydrogels with high specific surface areas have great promise in many practical applications. However, the preparation of nanowire hydrogels using common materials and inexpensive means remains an outstanding challenge. This article reports a novel method for creating aligned nanowire structured hydrogels by directional freezing and γ-radiation initiated polymerization of 2-hydroxyethyl methacrylate (HEMA) using t-butyl alcohol (TBA) as the solvent. The hydrogels prepared at a monomer concentration lower than 2.0 mol L -1 and a freezing rate higher than 10 mm min -1 are structured of nanowires, mimicking the microstructure of jellyfish mesogloea. Silver (Ag) nanoparticles (NPs) are introduced into the hydrogels with a chemical reduction method, and the Ag NPs are formed and deposited on the nanowires. Both size and content of Ag NPs in the hydrogels increase with increasing AgNO 3 concentration. The PHEMA and PHEMA/Ag nanocomposite hydrogels all possess very good compressive properties, and the composite hydrogels show higher compressive strengths and excellent deformation recovery. The PHEMA/Ag NPs composite hydrogels show excellent catalytic activity and reusability for the conversion of o-nitroaniline to 1,2-benzenediamine, with an apparent rate constant (k app ) up to 0.165 min -1 . This facile and efficient method can be applied to fabricate more nanowire hydrogels for many practical applications.

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Doping nano-Co3O4 surface with bigger nanosized Ag and its photocatalytic properties for visible light photodegradation of organic dyes

Cited by 60 publications

References 45 publications

Azadirachta indica leaves extract assisted green synthesis of Ag-TiO2 for degradation of Methylene blue and Rhodamine B dyes in aqueous medium

Azadirachta indica leaves extract assisted green synthesis of Ag-TiO2 for degradation of Methylene blue and Rhodamine B dyes in aqueous medium

Photocatalytic Reactors Dedicated to the Degradation of Hazardous Organic Pollutants: Kinetics, Mechanistic Aspects, and Design – A Review

Biomimetic Nanowire Structured Hydrogels as Highly Active and Recyclable Catalyst Carriers

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