Solvothermal synthesis, characterization and optical properties of ZnO, ZnO–MgO and ZnO–NiO, mixed oxide nanoparticles

Aslani, Alireza; Arefi, Mohammad; Babapoor, Aziz; Amiri, Asghar; Beyki-Shuraki, Khalil

doi:10.1016/j.apsusc.2010.12.135

Cited by 36 publications

(11 citation statements)

References 28 publications

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“…These carbon spheres were thermally evaporated by calcination at high temperature (400 °C) in the final step [25]. There are also some reports on mixed oxides and nanocomposites of ZnO with p-type oxides such as NiO and CuO through simple template-free precipitation routes [27,28,35]. Noticeably, such reports do not mention the formation of p-n heterojunctions [27,28,35].…”

Section: Introductionmentioning

confidence: 99%

“…There are also some reports on mixed oxides and nanocomposites of ZnO with p-type oxides such as NiO and CuO through simple template-free precipitation routes [27,28,35]. Noticeably, such reports do not mention the formation of p-n heterojunctions [27,28,35]. For instance, Sharma et al [27] had prepared nanostructured ZnO-NiO mixed oxide powder with improved photocatalytic activity through a homogeneous precipitation method followed by high-temperature annealing in the range 300-700 °C.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Sharma et al [27] had prepared nanostructured ZnO-NiO mixed oxide powder with improved photocatalytic activity through a homogeneous precipitation method followed by high-temperature annealing in the range 300-700 °C. Facile chemical routes reported in the literature for the preparation of ZnO-NiO nanocomposites include onepot solution processing followed by high-temperature annealing (300-700 °C) [28] and solvothermal process involving long process duration (12 h) [35].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

et al. 2019

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Formation of heterostructures with p-type oxides such as NiO and CuO is one of the effective methods for improving the photocatalytic performance of ZnO. Such systems are often synthesized through template-based growth techniques that involve many steps. We have prepared ZnO-NiO composites through a facile, template-free, low-temperature sonochemical route. High-resolution transmission electron microscopy analysis indicates the formation of ZnO-NiO heterostructures. Photocatalytic activity of ZnO-NiO nanocomposites in the decomposition of methylene blue dye under solar irradiation is found to be much larger than that of both pure ZnO (1.26 × 10 −2 min −1 ) and NiO (0.31 × 10 −2 min −1 ) establishing synergistic effects. The rate constant increases with increase in the percentage of NiO in the composite and is 6.00 × 10 −2 min −1 for sample with the highest percentage of NiO. Rate constants for the second and third runs are estimated to be 4.4 × 10 −2 and 4.2 × 10 −2 min −1 which are promising. The main mechanism of enhancement of photocatalytic activity of the composites is identified as the more effective separation of the photogenerated free charge carries due to the internal electric field at the ZnO-NiO interface. Sharp decrease in the relative intensity of the band-band emission of ZnO at ~ 380 nm in the case of composite samples and analysis of the relative position of the conduction band and valence band edges of ZnO and NiO support the proposed mechanism.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

et al. 2019

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“…Therefore, it is attempted to synthesize ZnO nano or microstructures in a controllable shape and size to meet the demand and to explore the potentials of ZnO. It is still a challenging task for material scientists, to directly fabricate large-scale ZnO crystals with controlled morphology (Xie et al 2009;Aslani et al 2011;Ahmed and Al-Owais 2012). In recent years, many researchers are inclined to prepare ZnO crystals at a low temperature to reduce energy consumption, improve large-scale production, and obtain special properties (Gu et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Nano ZnO structures synthesized in presence of anionic and cationic surfactant under hydrothermal process

Thilagavathi¹,

Geetha²

2012

Appl Nanosci

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Uniform ZnO nano structures are synthesized in the presence of anionic surfactant, sodium dodecyl benzene sulfonate (SDBS) and cationic surfactant, cetyl tri methyl ammonium bromide (CTAB) at 100°C using NaOH as the reactant. The particle size, morphology and structure of the nano ZnO particles are collected by X-ray diffraction, scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectra. Rod and cone shaped ZnO nano structure is observed. It may vary in morphology from pure ZnO structure due to the presence of surfactants. The results show that there is an extrinsic relation between the morphology of the samples. Based on the relation, we proposed that there might be two kinds of interactions between SDBS and CTAB with ZnO particles, i.e., inter-and intra-interactions.

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“…The synthesis of the nanocomposite was carried out according to previous studies with some modification (Aslani et al 2011). To describe the method briefly, a 10-mmol solution of Zn(AC) 2 was dissolved in 50 mL of methanol and added to a 10-mmol solution of Mg(NO 3 ) 2 •6H 2 O that was also dissolved in 50 mL of methanol.…”

Section: Synthesis Of Zno-mgo@cnf Nanocompositementioning

confidence: 99%

MgO-ZnO/carbon nanofiber nanocomposite as an adsorbent for ultrasound-assisted dispersive solid-phase microextraction of carbamazepine from wastewater prior to high-performance liquid chromatographic detection

2019

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A simple, rapid, and efficient ultrasound-assisted dispersive solid-phase microextraction (UA-DSPME) method was developed for the preconcentration of carbamazepine (CBZ) in wastewater prior to high-performance liquid chromatography coupled with diode array (HPLC-DAD) determination. The carbon nanofibers coated with magnesium oxide-zinc oxide (MgO-ZnO@CNFs) nanocomposite was used as an efficient adsorbent in magnetic dispersive solid-phase microextraction method. The structural and morphological properties of the nanocomposite were characterized by scanning electron microscopy and energy dispersive spectroscopy, transmission electron microscopy, X-ray diffractometer, and Fourier transform infrared spectroscopy. The surface area was investigated using Brunauer-Emmett-Teller. Several factors (such as pH, mass of adsorbent, extraction time, and eluent volume) that affect extraction and preconcentration of CBZ were also assessed and optimized using response surface methodology based on central composite design. Under optimal conditions, the limits of detection (LOD) and quantification were 0.08 μg L −1 and 0.29 μg L −1 , respectively. The calibration curve constructed after preconcentration of seven successive standards was linear in the concentration range of 0.3-800 μg L −1 with the correlation coefficient of 0.9922. The intra-day and inter-day precisions expressed in terms of relative standard deviation were 1.4% and 4.2%. A preconcentration factor of 490 was achieved, and the method was applied for the analysis of spiked wastewater. Satisfactory recoveries ranging from 97.8 to 102% were obtained.

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Solvothermal synthesis, characterization and optical properties of ZnO, ZnO–MgO and ZnO–NiO, mixed oxide nanoparticles

Cited by 36 publications

References 28 publications

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

Nano ZnO structures synthesized in presence of anionic and cationic surfactant under hydrothermal process

MgO-ZnO/carbon nanofiber nanocomposite as an adsorbent for ultrasound-assisted dispersive solid-phase microextraction of carbamazepine from wastewater prior to high-performance liquid chromatographic detection

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