A facile synthesis of ZnO/CNT hierarchical microsphere composites with enhanced photocatalytic degradation of methylene blue

Zhu, Guang; Wang, Hongyan; Yang, Gaoxia; Chen, Liang-Wei; Guo, Peijun; Zhang, Li

doi:10.1039/c5ra11873e

Cited by 52 publications

(25 citation statements)

References 61 publications

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“…This collective effect enabled the active participation of defect state and catalysis taking place at CB as well as VB, leading to higher photocatalytic activity. Then, Zhu et al prepared carbon nanotube (CNT) and hierarchical ZnO microsphere composites (ZnO/CNT) and applied them to photo-catalytic degradation of MB [192]. The results showed that the photocatalytic activity of ZnO/CNTs composites is superior to that of pure ZnO microspheres.…”

Section: Degradation Of Methylene Blue (Mb)mentioning

confidence: 99%

“…ZnO-CNT Microsphere The high surface area, enhanced light absorption, and suppression of charge carrier recombination originated from the interaction between ZnO and CNT [192] ZnO-ZnS Nanocable nanotube The increased separation and transfer rate of photo-induced electrone-hole pairs on the surface of ZnO/ZnS nanocable and the high surface-to-volume ratio [193] TiO 2 -ZnO Nano-spheres, nanorods The suppression of electron-hole pair recombination and the synergetic effects between hexagonal wurtzite ZnO and rutile TiO 2 phases that related to ZnO morphology [194] The formation of oxygen vacancies; the decreased ZnO nanowire diameter size could increase the effective band gap then the photo-generated electrons and holes have a higher reducing/oxidizing power. [196] ZnO Nanorods The higher aspect ratio and larger specific surface area will enhance light photon capture efficiency, promote the generation of photo-induced charges and accelerate their transferrate.…”

Section: Znomentioning

confidence: 99%

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The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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Zinc oxide (ZnO), with the unique chemical and physical properties of high chemical stability, broad radiation absorption range, high electrochemical coupling coefficient, and high photo-stability, is an attractive multifunctional material which has promoted great interest in many fields. What is more, its properties can be tuned by controllable synthesized morphologies. Therefore, after the success of the abundant morphology controllable synthesis, both the morphology-dependent ZnO properties and their related applications have been extensively investigated. This review concentrates on the properties of morphology-dependent ZnO and their applications in catalysis, mainly involved reactions on green energy and environmental issues, such as CO 2 hydrogenation to fuels, methanol steam reforming to generate H 2 , bio-diesel production, pollutant photo-degradation, etc. The impressive catalytic properties of ZnO are associated with morphology tuned specific microstructures, defects or abilities of electron transportation, etc. The main morphology-dependent promotion mechanisms are discussed and summarized.

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Section: Degradation Of Methylene Blue (Mb)mentioning

confidence: 99%

Section: Znomentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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“…While when hybridizing ZnO with N‐HCNTs, the as‐prepared composites clearly exhibits broad and strong absorption intensity in the whole UV and visible‐light regions. It is resulted from that the N‐doped helical carbon nanotubes incorporated in the composites modified the optical properties of ZnO with enlarging light absorption range, which is similar to carbon nanotubes‐ZnO study …”

Section: Resultsmentioning

confidence: 90%

Facile fabrication of ZnO/N‐doped helical carbon nanotubes composites with enhanced photocatalytic activity toward organic pollutant degradation

Cai

et al. 2017

Applied Organom Chemis

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Novel ZnO/N-doped helical carbon nanotubes (ZnO/N-HCNTs) composites were successfully synthesized via a facile chemical precipitation approach at room temperature. The sample was well characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The photocatalytic activity was evaluated in the degradation of methylene blue (MB) aqueous solution under UV light irradiation. It is found that ZnO nanoparticles were highly and uniformly anchored on the surface and inner tubes of the N-HCNTs with size of about 5 nm, and significantly enhanced the photocatalytic activity compared to pure ZnO. The enhanced photocatalytic activity of ZnO/N-HCNTs composites can be ascribed to the integrative synergistic effect of effective interfacial hybridization between N-HCNTs and ZnO nanoparticles and the prolonged lifetime of photogenerated electron-hole pairs. Moreover, the ZnO/N-HCNTs could be easily recycled without any obvious decrease in photocatalytic activity and could be promote their application in the area of environmental remediation.

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“…Moreover, the photogenerated holes absorbed by defects react with dye molecules (electron donor) and the photocatalytic reaction is greatly facilitated [28,29]. Few attempts have been demonstrated to improve the photocatalytic activity of metal oxides by monitoring the various parameters such as grain size, surface area, oxygen defects, aspect ratio and facets [18,[30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Morphological tuned preparation of zinc oxide: reduced graphene oxide composites for non-enzymatic fluorescence glucose sensing and enhanced photocatalysis

Sivalingam

Karthikeyan

2016

Appl. Phys. A

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Zinc oxide: reduced graphene oxide (ZnO:rgo) composites with varying ZnO morphologies have been synthesized towards the application of non-enzymatic fluorescence (FL) glucose sensor and photocatalysis for methylene blue (MB) degradation. The phase structure of ZnO has confirmed by X-ray diffraction studies, and the band gap calculations were done by UV absorption spectra. Scanning electron microscope and Raman spectra revealed the morphological change and the vibrational studies of the prepared samples, respectively. The quenching of the FL emission band of ZnO:rgo composite sample confirmed the transfer of electrons from ZnO to rgo which inhibit the exciton recombination process. The non-enzymatic FL glucose sensing was carried out by the addition of dextrose glucose (D-glucose) into the ZnO:rgo composite solution, which shows strong relationship between glucose concentration and the FL intensity. The photocatalytic studies showed that composite with high surface to volume ratio exhibits a maximum degradation of MB over 93 %. Our combined results ensured that the ZnO:rgo composites with varying morphologies could be an effective system for applications such as FL-based glucose sensing and photocatalytic degradation.

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A facile synthesis of ZnO/CNT hierarchical microsphere composites with enhanced photocatalytic degradation of methylene blue

Cited by 52 publications

References 61 publications

The Applications of Morphology Controlled ZnO in Catalysis

The Applications of Morphology Controlled ZnO in Catalysis

Facile fabrication of ZnO/N‐doped helical carbon nanotubes composites with enhanced photocatalytic activity toward organic pollutant degradation

Morphological tuned preparation of zinc oxide: reduced graphene oxide composites for non-enzymatic fluorescence glucose sensing and enhanced photocatalysis

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