Synthesis and characterization of ZnO, CuO and a mixed Zn and Cu oxide

Fernandes, D.M.; Silva, Rafael; Hechenleitner, Ana Adelina Winkler; Radovanovic, Eduardo; Melo, M.A.C. de; Pineda, Edgardo Alfonso Gómez

doi:10.1016/j.matchemphys.2008.11.038

Cited by 203 publications

(61 citation statements)

References 27 publications

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“…Saravanan et al 29 investigated the degradation of organic dyes using ZnO/CuO proportions from 99:1 to 50:50 and they found the best photocatalytic activities took place for semiconductors containing CuO from 1.0 to 5.0 %. Liu et al 25 varied the CuO proportion from 0.2 to 1.8 % and found a 90% degradation of acid black, when they used 1.0 % CuO. On the other hand, Chang et al 20 obtained the largest degradation for 20% CuO, when they varied from 5 to 20% CuO.…”

Section: Resultsmentioning

confidence: 99%

“…To prepare metal oxide composites, several techniques such as hydrothermal [19][20][21] , co-precipitation [22][23][24] , sol-gel 25 , solution combustion 26,27 , thermal decomposition 28 , and wet impregnation 29 have been used. So, this work aims to prepare a low cost mixed oxide of zinc and copper from their pure oxides without residues generation, characterize and measure the photocatalytic activity for the decolorization and degradation of the direct red 80 tetraazodye (DR80, Figure 1) and compare them with pure zinc oxide.…”

Section: Introductionmentioning

confidence: 99%

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PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Silva

Takashima

2015

J. Chil. Chem. Soc.

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Zinc oxide, an n-type semiconductor, has been used as photocatalyst for contaminated water purification by organic compounds. The addition of a p-type semiconductor as copper oxide could increase the catalytic efficiency through the p-n junction in order to decrease the electron-hole recombination. In this work, zinc and copper oxides containing 1.0, 3.0, and 5.0 % of copper were prepared by manual grinding, followed by heat treatment at 300ºC during 5 h. The zinc oxide and copper oxide mixture as well as their precursors were characterized by x-ray diffraction, diffuse reflectance, scanning electron microscopy, and x-ray fluorescence. The photocatalytic efficiency was verified by the direct red 80 tetraazodye decolorization using UV radiation under pseudo-first order conditions at natural pH (7.5-8.0) and 30 °C. The highest photocatalytic activity occurred to the semiconductor containing 1.0 % copper oxide, whose decolorization rate constant was equivalent to 6.40×10 -2 min -1 , that is, 17.4 % larger in comparison to ZnO, 5.45×10 -2 min -1 .

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Silva

Takashima

2015

J. Chil. Chem. Soc.

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“…For ZnO, five intense peaks at 30-60 degrees can be observed which can be associated to diffraction of 100, 002, 101, 102 and 110 planes. 13,31 The diffraction pattern also revealed high crystallinity of ZnO. The formation of protocatechuic acid nanocomposite, PAN is believed to occur through a dissociation-decomposition mechanism in three steps: 1.…”

Section: Powder X-ray Diffraction and Structural Modelmentioning

confidence: 98%

Anticancer nanodelivery system with controlled release property based on protocatechuate–zinc layered hydroxide nanohybrid

Barahuie

Hussein

Gani

et al. 2014

IJN

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Background We characterize a novel nanocomposite that acts as an efficient anticancer agent. Methods This nanocomposite consists of zinc layered hydroxide intercalated with protocatechuate (an anionic form of protocatechuic acid), that has been synthesized using a direct method with zinc oxide and protocatechuic acid as precursors. Results The resulting protocatechuic acid nanocomposite (PAN) showed a basal spacing of 12.7 Å, indicating that protocatechuate was intercalated in a monolayer arrangement, with an angle of 54° from the Z-axis between the interlayers of the zinc layered hydroxide, and an estimated drug loading of about 35.7%. PAN exhibited the properties of a mesoporous type material, with greatly enhanced thermal stability of protocatechuate as compared to its free counterpart. The presence of protocatechuate in the interlayers of the zinc layered hydroxide was further supported by Fourier transform infrared spectroscopy. Protocatechuate was released from PAN in a slow and sustained manner. This mechanism of release was well represented by a pseudo-second order kinetics model. PAN has shown increased cytotoxicity compared to the free form of protocatechuic acid in all cancer cell lines tested. Tumor growth suppression was extensive, particularly in HepG2 and HT29 cell lines. Conclusion PAN is suitable for use as a controlled release formulation, and our in vitro evidence indicates that PAN is an effective anticancer agent. PAN may have potential as a chemotherapeutic drug for human cancer.

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“…The measurements were performed at 600 nm wavelength using UV/Vis spectrophotometer (WPA LightWave S2000) at a frequency of once in an hour. [12]. The change in the lattice parameters of the doped samples is negligible.…”

Section: Experimental Methodsmentioning

confidence: 94%

Effect of doping on structural and optical properties of ZnO nanoparticles: study of antibacterial properties

Maddahi¹,

Shahtahmasebi²,

Kompany³

et al. 2014

Materials Science-Poland

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Sol-gel method was successfully used for synthesis of ZnO nanoparticles doped with 10 % Mg or Cu. The structure, morphology and optical properties of the prepared nanoparticles were studied as a function of doping content. The synthesized ZnO:(Mg/Cu) samples were characterized using XRD, TEM, FTIR and UV-Vis spectroscopy techniques. The samples show hexagonal wurtzite structure, and the phase segregation takes place for Cu doping. Optical studies revealed that Mg doping increases the energy band gap while Cu incorporation results in decrease of the band gap. The antibacterial activities of the nanoparticles were tested against Escherichia coli (Gram negative bacteria) cultures. It was found that both pure and doped ZnO nanosuspensions show good antibacterial activity which increases with copper doping, and slightly decreases with adding Mg.

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Synthesis and characterization of ZnO, CuO and a mixed Zn and Cu oxide

Cited by 203 publications

References 27 publications

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Anticancer nanodelivery system with controlled release property based on protocatechuate–zinc layered hydroxide nanohybrid

Effect of doping on structural and optical properties of ZnO nanoparticles: study of antibacterial properties

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Synthesis and characterization of ZnO, CuO and a mixed Zn and Cu oxide

Cited by 203 publications

References 27 publications

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Anticancer nanodelivery system with controlled release property based on protocatechuate&ndash;zinc layered hydroxide nanohybrid

Effect of doping on structural and optical properties of ZnO nanoparticles: study of antibacterial properties

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Anticancer nanodelivery system with controlled release property based on protocatechuate–zinc layered hydroxide nanohybrid