Photocatalytic activity of ZnO and Sr 2+ doped ZnO nanoparticles

Kumaran, Nimisha N.; Muraleedharan, K.

doi:10.1016/j.jwpe.2017.04.014

Cited by 55 publications

(26 citation statements)

References 28 publications

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“…Numerous diffraction peaks found at 2θ = 31.86° (100), 34.54° (002), 36.32° (101), 47.62° (102), 56.66° (110), 62.96° (103), 66.44° (200), 68.04° (112), 69.18° (201), according to JCPDS card No. 36-1451, could be assigned to the hexagonal wurtzite structure of ZnO [28,33,34]. In addition, the XRD spectra indicated the absence of lanthanum oxide or Zn–La alloys formation [35], and also indicated a trend of continuously broadening XRD peaks of La-doped ZnO in response to increasing La load.…”

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

et al. 2019

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Lanthanum (La)-doped zinc oxide nanoparticles were synthesized with different La concentrations by employing a gel combustion method using poly(vinyl alcohol) (PVA). The as-synthesized photocatalysts were characterized using various techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), photoluminescence (PL) spectroscopy, and UV–visible absorption spectroscopy. The average size of ZnO nanoparticles decreased from 34.3 to 10.3 nm with increasing concentrations of La, and the band gap, as evaluated by linear fitting, decreased from 3.10 to 2.78 eV. Additionally, it was found that the photocatalytic activity of doped samples, as investigated by using methyl orange dye under visible lights, improved in response to the increase in La concentration. The decomposition of methyl orange reached 85.86% after 150 min in visible light using La0.1Zn0.9O as the photocatalyst.

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Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

et al. 2019

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“…The rate constant of the degradation, k, was obtained from the first-order plot according to the equation: ln ðA 0 / AÞ = kt, where A 0 is the initial absorbance of dye and A is the absorbance of dye solution after UV light irradiation [19].…”

Section: Photocatalytic Studymentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Activity of ZnO Nanomaterials Prepared by a Green, Nonchemical Route

Nguyen

Nguyen²

2020

Journal of Nanomaterials

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An eco-friendly method for the synthesis of ZnO nanoparticles was studied. Zinc acetate precursor was thermally decomposed without adding any chemical agents. The synthesized materials were thoroughly characterized by various analytical tools. The results indicated that the synthesized ZnO nanomaterials have a wurtzite structure. The estimated crystallite sizes of the materials obtained at 450, 550, 650, and 750°C (named as ZnO-450, ZnO-550, ZnO-650, and ZnO-750) were 33, 36, 38, and 42 nm, respectively. The morphology of the nanomaterials was revealed to be affected by calcination temperature, causing the formation of both nanoparticles and nanorods with different sizes and shapes. The materials were applied as photocatalysts for methylene blue (MB) decomposition under ultraviolet (UV) light. Results showed that the decomposition efficiency strongly depends on UV illumination time, size, and morphology of ZnO nanomaterials. The highest MB decomposition (99.4%) is obtained when using ZnO-750. The photocatalytic decomposition follows the first-order reaction. The reaction rate constants corresponding to the MB decomposition process with the presence of ZnO-450, ZnO-550, ZnO-650, and ZnO-750 are 0.0512, 0.0636, 0.1077, and 0.1286 min-1, respectively.

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“…characterized with high thermal and mechanical stability at room temperature (Kumaran et al, 2017). ZnO nanoparticles can be synthesized by physical and chemical methods such as solvothermal reduction, sol-gel technique, hydrothermal, flame spray pyrolysis, thermal evaporation, chemical vapour deposition, photo deposition, to mention but few (Peruma et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Adsorptive and Photocatalytic Properties of Green Synthesized ZnO and ZnO/NiFe2O4 Nanocomposites for Tannery Wastewater Treatment

Tijani

Aminu²,

Bankole³

et al. 2021

Nig. J. Technol. Dev.

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This study investigated adsorptive and catalytic behaviour of ZnO and ZnO/NiFe2O4 nanocomposites for the removal and degradation of organic pollutants in tannery wastewater. ZnO and ZnO/NiFe2O4 nanomaterials were synthesized via a green method using Zn, Fe and Ni salts precursor and leaves extract of Anacardium occidentale (linn.). Subsequently, the synthesized samples were characterized by different analytical tools. The adsorptive and catalytic performance of the prepared nanomaterial were assessed using reduction in Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD) and Total Organic Carbon (TOC) in tannery wastewater as indicator parameters. High Resolution Scanning Electron Microscope (HRSEM), High Resolution Transmission Electron Microscope (HRTEM), and X-Ray Diffraction (XRD) analysis of ZnO and ZnO/NiFe2O4 confirmed the formation of hexagonal wurtzite nanoparticle and cubic spinel phase with an average crystallite sizes in the range of 13- 28 nm and 30.44 – 42.53 nm respectively. XRD analysis confirmed no change in the polymorph of ZnO upon the addition NiFe2O4. XPS spectrum showed the existence of the elements in the following oxidation state (+2) for Zn, (+1, +2) for Ni and (+2 and +3) for Fe. BET analysis revealed order of the specific surface area of ZnO/NiFe2O4 (44.61 m2/g) > NiFe2O4 (40.39 m2/g) > ZnO (8.91 m2 /g). The adsorptive and photocatalytic results revealed that 3% ZnO/NiFe2O4 exhibits higher efficiency compared to ZnO and NiFe2O4 nanoparticles alone and in the order of 3% ZnO/NiFe2O4 > NiFe2O4 > ZnO. The study revealed that the prepared nanomaterial behaved better as photocatalyst than as nanoadsorbent. Keywords: Adsorption, photocatalytic technology; ZnO; ZnO/NiFe2O4, tannery wastewater

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Photocatalytic activity of ZnO and Sr 2+ doped ZnO nanoparticles

Cited by 55 publications

References 28 publications

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

Synthesis, Characterization, and Photocatalytic Activity of ZnO Nanomaterials Prepared by a Green, Nonchemical Route

Adsorptive and Photocatalytic Properties of Green Synthesized ZnO and ZnO/NiFe2O4 Nanocomposites for Tannery Wastewater Treatment

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