Preparation, characterization and application of Cu–Ni/TiO<sub>2</sub>in Orange II photodegradation under visible light: effect of different reaction parameters and optimization

Riaz, Nadia; Kait, Chong Fai; Man, Zakaria; Sarwar, Rizwana; Farooq, Umar; Khan, Asim Jahangir; Khan, Muhammad Saqib

doi:10.1039/c6ra10371e

Cited by 28 publications

(18 citation statements)

References 66 publications

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“…Extrapolating it to the tangent of the graph in the low energy range (hv) axis yields the semiconductor bandgap when [F(R).hv] 1/2 = 0 [ 34 ]. The bandgap obtained in this way was 3.19 eV for TiO 2 and 2.95 eV for 20N–TiO 2 -300, indicating the noticeable structural modification of TiO 2 with nitrogen, thus enhancing the photon absorption properties [ 35 ], and the bandgap estimation can be seen in Figure S2 .…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies

et al. 2020

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Textile dyes and microbial contamination of surface water bodies have been recognized as emerging quality concerns around the globe. The simultaneous resolve of such impurities can pave the route for an amicable technological solution. This study reports the photocatalytic performance and the biocidal potential of nitrogen-doped TiO2 against reactive black 5 (RB5), a double azo dye and E. coli. Molecular docking was performed to identify and quantify the interactions of the TiO2 with β-lactamase enzyme and to predict the biocidal mechanism. The sol-gel technique was employed for the synthesis of different mol% nitrogen-doped TiO2. The synthesized photocatalysts were characterized using thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET) and diffuse reflectance spectroscopy (DRS). The effects of different synthesis and reaction parameters were studied. RB5 dye degradation was monitored by tracking shifts in the absorption spectrum and percent chemical oxygen demand (COD) removal. The best nanomaterial depicted 5.57 nm crystallite size, 49.54 m2 g−1 specific surface area, 11–40 nm particle size with spherical morphologies, and uniform distribution. The RB5 decolorization data fits well with the pseudo-first-order kinetic model, and the maximum monolayer coverage capacity for the Langmuir adsorption model was found to be 40 mg g−1 with Kads of 0.113 mg−1. The LH model yielded a higher coefficient KC (1.15 mg L−1 h−1) compared to the adsorption constant KLH (0.3084 L mg−1). 90% COD removal was achieved in 60 min of irradiation, confirmed by the disappearance of spectral peaks. The best-optimized photocatalysts showed a noticeable biocidal potential against human pathogenic strain E. coli in 150 min. The biocidal mechanism of best-optimized photocatalyst was predicted by molecular docking simulation against E. coli β-lactamase enzyme. The docking score (−7.6 kcal mol−1) and the binding interaction with the active site residues (Lys315, Thr316, and Glu272) of β-lactamase further confirmed that inhibition of β-lactamase could be a most probable mechanism of biocidal activity.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies

et al. 2020

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“…The discharge of large volumes of azo dye industrial effluents into water bodies is a concerning practice because it can generate serious environmental and health problems; 1 such highly colored dyes are a dramatic source of aesthetic pollution, 2 as well as being toxic, carcinogenic 3,4 and mutagenic. 5 Azo dyes are characterized by one or more -N=N-bonds, 3,4 usually conjugated with benzene and/or naphthalene systems.…”

Section: Introductionmentioning

confidence: 99%

“…OII is very stable and widely used in the textile, food and cosmetic industries. 2,9 SY is extensively used in food, pharmaceuticals and cosmetic products. 4,10,11 Therefore, the removal of color from aqueous effluents is of remarkable environmental and health importance.…”

Section: Introductionmentioning

confidence: 99%

“…15,17,18 The H 2 O 2 can be produced by gas diffusion electrode (GDE) cathodes, which are advantageous due to the large contact areas among the cathode, oxygen and water. 19 O 2 + 2H + + 2e -→ H 2 O 2 (2) Most recently, there have been increased efforts in developing EAOPs based on in situ hydrogen peroxide production, such as the electro-Fenton (EF) and photoelectro-Fenton (PEF) processes. 20,21 In EF, the electrogenerated H 2 O 2 reacts with externally added Fe 2+ ions to produce hydroxyl radicals and Fe 3+ ions, according to Fenton's reaction (equation 3).…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Peroxide Electrogeneration by Gas Diffusion Electrode Modified With Tungsten Oxide Nanoparticles for Degradation of Orange II and Sunset Yellow FCF Azo Dyes

Paz

Pinheiro

Aveiro

et al. 2019

J. Braz. Chem. Soc.

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In this work, the gas diffusion electrode (GDE) cathode of Vulcan XC72 carbon modified with nanoparticles of WO 2.72 (WO 2.72 / Vulcan XC72) was used for H 2 O 2 electrogeneration and degradation of 350 mL of Orange II (OII) and Sunset Yellow FCF (SY) azo dyes by electro-Fenton (EF) and photoelectro-Fenton (PEF) processes with different Fe 2+ initial content (1.00, 0.50 and 0.25 mmol L-1). The WO 2.72 / Vulcan XC72 GDE electrolyzed approximately 3 times more H 2 O 2 than the Vulcan XC72 GDE. Decolorizations and mineralizations of the dye solutions were more efficient at higher concentrations of Fe 2+. The decolorization decay showed pseudo-first-order kinetics. The most promising decolorization results obtained at processes of WO 2.72 / Vulcan XC72 cathode combined with Pt anode (100% color removal of OII and SY at 30 and 20 min of electrolysis with 1.00 mmol L-1 Fe 2+ , respectively). The best mineralization achieved in trials of WO 2.72 / Vulcan XC72 cathode combined with boron-doped diamond (BDD) anode (82% total organic carbon (TOC) removal of OII by PEF / 1.00 after 3 h and 90% TOC removal of SY by PEF / 0.50 after 4 h). It was found that SY decolorization was faster and mineralization showed a similar yield independent of oxidized dye.

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“…23,24 This is based on their strong oxidation performance and a wide range of applications of AOT. [25][26][27][28][29] For AOT, electrochemical incineration, 30 microwave radiation, 5 photocatalysis, 31,32 and other Fenton methods 2,4 have been also used to treat BDIs wastewater effectively. However, the above methods have some limitations in practical application.…”

Section: 14mentioning

confidence: 99%

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

et al. 2018

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Benzene dye intermediate (BDI) 4-methoxy-2-nitroaniline (4M2NA) wastewater has caused significant environmental concern due to its strong toxicity and potential carcinogenic effects. Reports concerning the degradation of 4M2NA by advanced oxidation process are limited. In this study, 4M2NA degradation by Fenton oxidation has been studied to obtain more insights into the reaction mechanism involved in the oxidation of 4M2NA. Results showed that when the 4M2NA (100 mg L À1) was completely decomposed, the TOC removal efficiency was only 30.70-31.54%, suggesting that some by-products highly recalcitrant to the Fenton oxidation were produced. UV-Vis spectra analysis based on Gauss peak fitting, HPLC analysis combined with two-dimensional correlation spectroscopy and GC-MS detection were carried out to clarify the degradation mechanism and pathway of 4M2NA. A total of nineteen reaction intermediates were identified and two possible degradation pathways were illustrated.Theoretical TOC calculated based on the concentration of oxalic acid, acetic acid, formic acid, and 4M2NA in the degradation process was nearly 94.41-97.11% of the measured TOC, indicating that the oxalic acid, acetic acid and formic acid were the main products. Finally, the predominant degradation pathway was proposed. These results could provide significant information to better understand the degradation mechanism of 4M2NA.

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Preparation, characterization and application of Cu–Ni/TiO₂in Orange II photodegradation under visible light: effect of different reaction parameters and optimization

Abstract: A series of mono- and bimetallic Cu–Ni/TiO2photocatalysts were preparedviawet impregnation. The addition of metal onto the surface of TiO2led to a better photocatalytic performance for Orange II photodegradation under visible light irradiation.

Cited by 28 publications

References 66 publications

Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies

Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies

Hydrogen Peroxide Electrogeneration by Gas Diffusion Electrode Modified With Tungsten Oxide Nanoparticles for Degradation of Orange II and Sunset Yellow FCF Azo Dyes

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

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Preparation, characterization and application of Cu–Ni/TiO2in Orange II photodegradation under visible light: effect of different reaction parameters and optimization

Abstract: A series of mono- and bimetallic Cu–Ni/TiO2photocatalysts were preparedviawet impregnation. The addition of metal onto the surface of TiO2led to a better photocatalytic performance for Orange II photodegradation under visible light irradiation.

Cited by 28 publications

References 66 publications

Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies

Photocatalytic Decolorization and Biocidal Applications of Nonmetal Doped TiO2: Isotherm, Kinetic Modeling and In Silico Molecular Docking Studies

Hydrogen Peroxide Electrogeneration by Gas Diffusion Electrode Modified With Tungsten Oxide Nanoparticles for Degradation of Orange II and Sunset Yellow FCF Azo Dyes

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

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Preparation, characterization and application of Cu–Ni/TiO₂in Orange II photodegradation under visible light: effect of different reaction parameters and optimization