Photocatalytic degradation of Aniline from aqueous solutions under sunlight illumination using immobilized Cr:ZnO nanoparticles

Pirsaheb, Meghdad; Shahmoradi, Behzad; Beikmohammadi, Masumeh; Azizi, Esmaeel; Hossini, Hooshyar; Ashraf, Ghulam Md

doi:10.1038/s41598-017-01461-5

Cited by 69 publications

(21 citation statements)

References 47 publications

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“…Although the particle size is larger due to the aggregation of the crystallites, the crystallite size is phenomenally mere 2 μm. The micrograph shows that a network origination of the ZnO nanoparticles has taken place as reported in earlier works [13,14]. It distinctly specifies that agglomeration has occurred and also established that, the morphology of Ag-doped ZnO and pure ZnO nanoparticles are closely similar.…”

Section: Scanning Electron Microscope (Sem)supporting

confidence: 78%

Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles

Chitradevi

Lenus

Jaya

2019

Mater. Res. Express

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Highly Crystalline pure and Ag-doped ZnO nanoparticles were prepared using the inexpensive sol-gel synthesis method with the stimulation of transition metal ion surfactant. The prepared pure and Agdoped (Silver doped) ZnO nanoparticles were characterised by various sophisticated techniques like x-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Dynamic Light scattering (DLS), Fourier Transform Infrared Spectroscopy (FTIR), UV-visible absorption, Photoluminescence (PL) and Zeta potential. The result indicates that the average grain size of the prepared nanoparticles was found to be a minuscule 24 nm with a commendable bandgap of 3.21 eV and 1.73 eV respectively. The hexagonal wurzite structures of pure and Ag-doped ZnO at room temperature confirmed the luminescence characteristics of the nanoparticles.

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Section: Scanning Electron Microscope (Sem)supporting

confidence: 78%

Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles

Chitradevi

Lenus

Jaya

2019

Mater. Res. Express

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“…In other words, the additional amount of catalyst substrates does not have any effect in the reaction. Moreover, when high amounts of catalyst is used, the reaction mixture becomes opaque, and the penetration of light to the surface of substrates would be hindered 70,71 .…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the formation of intermediates during the photocatalytic process influences the overall aniline degradation rate. Since by increasing the initial concentration, the amount of formation of intermediates increases which competitively attach to the surface of the catalyst and also competitively react with oxidant species 70,72 .…”

Section: Resultsmentioning

confidence: 99%

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Ghasemipour

Fattahi

Rasekh

et al. 2020

Sci Rep

142

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Transition metal sulfide semiconductors have achieved significant attention in the field of photocatalysis and degradation of pollutants. MoS 2 with a two dimensional (2D) layered structure, a narrow bandgap and the ability of getting excited while being exposed to visible light, has demonstrated great potential in visible-light-driven photocatalysts. However, it possesses fast-paced recombination of charges. in this study, the coupled MoS 2 nanosheets were synthesized with Zno nanorods to develop the heterojunctions photocatalyst in order to obtain superior photoactivity. the charge transfer in this composite is not adequate to achieve desirable activity. therefore, heterojunction was modified by reduced graphene oxide (RGO) nanosheets and carbon nanotubes (cnts) to develop the RGo/Zno/MoS 2 and cnts/Zno/MoS 2 ternary nanocomposites. the structure, morphology, composition, optical and photocatalytic properties of the as-fabricated samples were characterized through X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Field Emission Scanning electron Microscopy (feSeM), transmission electron Microscopy (teM), energy-Dispersive X-ray (eDX), elemental mapping, photoluminescence (pL), Ultraviolet-Visible spectroscopy (UV-ViS), and Brunauer-emmett-teller (Bet) techniques. the photo-catalytic performance of all samples was evaluated through photodegradation of aniline in aqueous solution. the combination of RGo or cnts into the Zno/MoS 2 greatly promoted the catalytic activity. However, the resulting RGo/Zno/MoS 2 ternary nanocomposites showed appreciably increased catalytic performance, faster than that of cnts/Zno/MoS 2. charge carrier transfer studies, the Bet surface area analysis, and the optical studies confirmed this superiority. The role of operational variables namely, solution pH, catalyst dosage amount, and initial concentration of aniline was then investigated for obtaining maximum degradation. complete degradation was observed, in the case of pH = 4, catalyst dosage of 0.7 g/L and aniline concentration of 80 ppm, and light intensity of 100 W. According to the results of trapping experiments, hydroxyl radical was found to be the main active species in the photocatalytic reaction. Meanwhile, a plausible mechanism was proposed for describing the degradation of aniline upon ternary composite. Moreover, the catalyst showed excellent reusability and stability after five consecutive cycles due to the synergistic effect between its components. Total-Organic-Carbon concentration (TOC) results suggested that complete mineralization of aniline occurred after 210 min of irradiation. Finally, a real petrochemical wastewater sample was evaluated for testing the catalytic ability of the as-fabricated composites in real case studies and it was observed that the process successfully quenched 100% and 93% of Chemical Oxygen Demand (COD) and TOC in the wastewater, respectively.

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“…This antibiotic is a water-soluble combination used to treat chronic infections caused by gram-negative bacteria such as Pseudomonas due to inhibiting protein synthesis in bacteria by binding to the 30S subunit of ribosomes [12]. Various methods have been used to eliminate drug compounds from aqueous solutions, including membrane processes (reverse osmosis [16], adsorption on activated carbon [17], and advanced oxidation processes or AOPs), ozonation [18][19], electrocoagulation [20], Fenton and photo-Fenton [21], ultrasonic [22], peroxidation with UV [23][24], adsorption [25][26], solar degradation [27], and photocatalytic processes [28][29]. In general, a number of disadvantages have been mentioned in the field of membrane processes, such as high equipment costs, maintenance costs, high energy consumption for start-ups, and the efficiency of these processes, the limitation of mass transfer, limitation of removal of organic compounds, membrane vulnerability due to attack of oxidizing materials, blockage of membrane pores by large molecules, prolonged time [30][31], the need for reverse washing, and resin regeneration [32].…”

Section: Introductionmentioning

confidence: 99%

Gentamicin Removal by Photocatalytic Process from Aqueous Solution

Baneshi¹,

Jahanbin²,

Mousavizadeh³

et al. 2018

Pol. J. Environ. Stud.

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The entry of gentamicin antibiotics into the aquatic environment has raised many concerns. Today, modern nanotechnology-based approaches have been employed to overcome such problems. The present study was conducted to investigate the efficiency of the UV/ZnO photocatalytic process in removing antibiotic gentamicin from aqueous solution. So we investigated the effects of parameters, including initial gentamicin concentrations (20, 60, and 100 mg/L), zinc oxide concentrations (0, 200, 350, and 500 mg/L), contact times (10, 30, 60, and 120 min), pH (5, 6, and 7), and type of radiation (sun and UV-C). The sample size and the number of test procedures were determined to be 576, taking into account the levels of effective variables and through the full factorial. All experiments were carried out in a double-compartment reactor at laboratory temperature using a magnetic stirrer at 150 rpm. The change of gentamicin concentrations were measured using a DR5000 spectrophotometer. Data analysis and charting were done through Design Expert 8 and Excel 2010 software. Results showed that the maximum removal efficiency of gentamicin of about 93% was obtained under UV-C irradiation at pH of 5, contact time of 30 min, ZnO concentration of 200 mg/L, and initial gentamicin concentration of 20 mg/L. In addition, the maximum removal efficiency of gentamicin (84.32%) under sunlight occurred at pH 6, contact time of 60 min, ZnO concentration of 200 mg/L, and initial gentamicin concentration of 20 mg/L. The results demonstrated that the photocatalytic UV/ZnO process exposed to UV-C or natural sunlight could be an effective process for removing antibiotic gentamicin from the aqueous solution.

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Photocatalytic degradation of Aniline from aqueous solutions under sunlight illumination using immobilized Cr:ZnO nanoparticles

Cited by 69 publications

References 47 publications

Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles

Structure, morphology and luminescence properties of sol-gel method synthesized pure and Ag-doped ZnO nanoparticles

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Gentamicin Removal by Photocatalytic Process from Aqueous Solution

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