Preparation, characterization and photocatalytic properties of ZnO-coated multi-walled carbon nanotubes

Zhu, Luping; Liao, Gui-Hong; Huang, Wen-Ya; Ma, Lili; Yang, Yang; Yu, Ying; Fu, Shao‐Yun

doi:10.1016/j.mseb.2009.05.021

Cited by 100 publications

(42 citation statements)

References 42 publications

(71 reference statements)

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“…MWCNTs-ZnO nanocomposites were synthesized using a solvothermal method based on Zhu's work with modifications [26]. The synthesis process of MWCNTs-ZnO nanocomposites comprises two steps.…”

Section: Preparation Of Zno Mwcnts-zno Nanocompositesmentioning

confidence: 99%

Photocatalytic, sonocatalytic and sonophotocatalytic degradation of Rhodamine B using ZnO/CNTs composites photocatalysts

Ahmad

Ahmed

Hong

et al. 2014

Ultrasonics Sonochemistry

308

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A series of ZnO nanoparticles decorated on multi walled carbon nanotubes (MWCNTs-ZnO) was synthesized using a facile solvothermal method. The intrinsic characteristics of as-prepared nanocomposites were studied using a variety of techniques including powder X-Ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), transmission electron microscope (TEM), scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDX), surface area analyzer (BET) and X-ray photoelectron spectroscopy (XPS). Optical properties studied using UV-Visible diffuse reflectance spectroscopy confirmed that the absorbance of ZnO increased in the visible-light region with the incorporation of MWCNTs. In this study, degradation of Rhodamine B (RhB) as a dye pollutant was investigated in the presence of pristine ZnO nanoparticles and MWCNTs-ZnO nanocomposites using photocatalysis and sonocatalysis systems separately and simultaneously. The natural sunlight and low power ultrasound were used as an irradiation source. The experimental kinetic data followed the pseudo-first order model in both photocatalytic and sonophotocatalytic processes but the rate constant of sonophotocatalysis is higher than it at photocatalysis process. The sonophotocatalysis was always faster than the respective individual processes due to the more formation of reactive radicals as well as the increase of the active surface area of MWCNTs-ZnO photocatalyst.Chemical oxygen demand (COD) of textile wastewater was measured at regular intervals to evaluate the mineralization of wastewater.

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“…MWCNTs-ZnO nanocomposites were synthesized using a solvothermal method based on Zhu's work with modifications [26]. The synthesis process of MWCNTs-ZnO nanocomposites comprises two steps.…”

Section: Preparation Of Zno Mwcnts-zno Nanocompositesmentioning

confidence: 99%

Photocatalytic, sonocatalytic and sonophotocatalytic degradation of Rhodamine B using ZnO/CNTs composites photocatalysts

Ahmad

Ahmed

Hong

et al. 2014

Ultrasonics Sonochemistry

308

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“…Due to their great hardness and toughness, multiwall CNTs (MWCNTs) keep their morphology and structure even at high nanoparticle loadings [11]. It has been indicated that the CNTs' properties can be dramatically influenced by the surface modification with organic, inorganic and biological species [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the recombination of photo induced electron and hole would be retarded. This process enhances the photocatalytic activity of CNT-ZnO hybrid nanostructures [11]. Chen et al synthesized ZnO nanoparticles decorated MWCNTs nanocomposite by a sol-gel method and observed that by increasing the calcination temperature from 450 to 700°C the sizes of ZnO nanoparticles increase and the layer of coated ZnO becomes discontinuous [13].…”

Section: Introductionmentioning

confidence: 99%

The effect of concentration ratio and type of functional group on synthesis of CNT–ZnO hybrid nanomaterial by an in situ sol–gel process

Largani

Pasha

2016

Int Nano Lett

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In this research, MWCNT-ZnO hybrid nanomaterials were synthesized by a simple sol-gel process using Zn(CH 3 COO) 2 Á2H 2 O and functionalized MWCNT with carboxyl(COOH) and hydroxyl(OH) groups. Three different mass ratios of MWCNT:ZnO = 3:1, 1:1 and 1:3 were examined. The prepared nanomaterials were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). Successful growth of MWCNT-ZnO hybrids for both COOH and OH functional groups and all the three mass ratios were obtained. The ZnO nanoparticles attached on the surfaces of CNTs have rather spherical shapes and hexagonal crystal structure. By increasing the concentration of ZnO, the number and average size of ZnO nanoparticles decorated the body of CNTs in hybrid structures increase. By increasing the ZnO precursor, the distribution of ZnO nanoparticles that appeared on the surface of CNTs becomes more uniform. The SEM observation beside EDX analysis revealed that at the same concentration ratio the amount of ZnO loading on the surface of MWCNT-COOH is more than MWCNT-OH. Moreover, the average size of ZnO nanoparticles attached on the surface of COOH functionalized CNTs is relatively smaller than that of OH functionalized ones.

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“…Recently, the metal oxide/CNT-based composites have been synthesised by various methods with remarkable functional properties. Zhu et al [12] employed a versatile sol-gel technique to coat ZnO nanoparticles on the multiwalled CNTs (MWCNTs) with better photocatalytic performance than pure ZnO nanoparticles. Liu et al [13] employed a simple chemical route to synthesise SnO 2 /MWCNTs composite with excellent sensing response and fast recovery to liquefied petroleum gas and ethanol gas.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis of ZnO/MWCNT hybrid nanocomposites and their alcohol-sensing properties

Potirak

Pecharapa

Techitdheera

2013

Journal of Experimental Nanoscience

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Zinc oxide and multi-walled carbon nanotube (ZnO/MWCNT) hybrid nanocomposites were synthesised by microwave-assisted method using the mixed solution of zinc acetate dehydrate (Zn(CH 3 COO) 2 Á2H 2 O) and treated MWCNTs. The syntheses were carried out at various microwave irradiation powers. The characterisation of the as-synthesised nanocomposites was conducted by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD results revealed that the composites were composed of two phases of MWCNTs and hexagonal wurzite ZnO. The SEM results showed that the ZnO nanoparticles were well decorated on the surface of MWCNTs. The amount of ZnO nanoparticles and their size increased with increasing irradiation power. Thick-film sensors were fabricated onto interdigitated conducting electrodes using as-synthesised hybrid composites as sensing materials. The alcohol-sensing behaviour of the hybrid composite films was investigated. The results indicated that the irradiation power had significant influence on the sensing response of the sensors toward alcohol. The sensor fabricated from the composite synthesised at higher irradiation power exhibited an enhanced alcohol-sensing performance.

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Preparation, characterization and photocatalytic properties of ZnO-coated multi-walled carbon nanotubes

Cited by 100 publications

References 42 publications

Photocatalytic, sonocatalytic and sonophotocatalytic degradation of Rhodamine B using ZnO/CNTs composites photocatalysts

Photocatalytic, sonocatalytic and sonophotocatalytic degradation of Rhodamine B using ZnO/CNTs composites photocatalysts

The effect of concentration ratio and type of functional group on synthesis of CNT–ZnO hybrid nanomaterial by an in situ sol–gel process

Microwave-assisted synthesis of ZnO/MWCNT hybrid nanocomposites and their alcohol-sensing properties

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