Reduced Graphene Oxide-Hierarchical ZnO Hollow Sphere Composites with Enhanced Photocurrent and Photocatalytic Activity

Luo, Qiang; Yu, Xiaoyun; Lei, Bing‐Xin; Chen, Hongyan; Kuang, Dai‐Bin; Su, Cheng‐Yong

doi:10.1021/jp2113329

Cited by 437 publications

(238 citation statements)

References 49 publications

Supporting

Mentioning

222

Contrasting

Unclassified

Order By: Relevance

“…The ZnO-C 3 N 4 (1) composite showed smaller semicircles compare to the bare ZnO and the C 3 N 4 , indicating the lower charge-transfer resistance on the surface of the composite [25]. With the suitable amount of ZnO, the charge transfer increased since C 3 N 4 can transfer the electron to the ZnO thus, preventing the rapid electron-hole recombination.…”

Section: Photocatalytic Activity Testmentioning

confidence: 98%

ENHANCED ACTIVITY OF C3N4 WITH ADDITION OF ZnO FOR PHOTOCATALYTIC REMOVAL OF PHENOL UNDER VISIBLE LIGHT

Hussin¹,

Lintang²,

Yuliati

2016

MJAS

View full text Add to dashboard Cite

Phenol is a stable and hazardous compound that is commonly found as an industrial effluent. Phenol can be treated by photocatalysis using zinc oxide (ZnO) as a photocatalyst. Unfortunately, the use of ZnO in photocatalysis is limited due to the poor response to the visible light. On the other hand, carbon nitride (C 3 N 4 ) is able to absorb visible light. In the present study, a series of ZnO-C 3 N 4 was prepared by impregnation method. The effect of zinc to carbon mol ratio (Zn/C) on the properties and photocatalytic activity was examined. X-ray Diffraction (XRD) patterns of the samples revealed that as the Zn mol ratio increased, the intensity of diffraction peaks for ZnO also increased but the intensity for C 3 N 4 decreased. All prepared composite materials have an extended absorption band in the visible light region due to the presence of C 3 N 4 , as supported by DR UV-Vis spectra. The prepared ZnO-C 3 N 4 composites were further investigated in the photocatalytic removal of phenol under visible light for 5 hours. All ZnO-C 3 N 4 samples showed higher activity than the bare ZnO with Zn/C mol ratio of 1% showed the highest photocatalytic activity for removal of phenol among all the samples. The high activity observed on the ZnO-C 3 N 4 would be due to role of ZnO to suppress electron-hole recombination and C 3 N 4 to extend the absorption of ZnO in the visible light region.Keywords: zinc oxide, carbon nitride, ZnO-C 3 N 4 composites, impregnation method, phenol Abstrak Fenol adalah sebatian stabil dan berbahaya yang sering dijumpai sebagai efluen industri. Fenol boleh dirawat dengan cara fotopemangkinan menggunakan zink oksida (ZnO) sebagai fotomangkin. Malangnya, penggunaan ZnO di dalam fotopemangkinan adalah terhad disebabkan sedikit respons terhadap sinaran tampak. Sebaliknya, karbon nitrida (C 3 N 4 ) mampu menyerap sinaran tampak. Dalam kajian ini, siri ZnO-C 3 N 4 telah disediakan melalui kaedah pengisitepuan. Kesan nisbah mol zink kepada karbon (Zn/C) kepada ciri dan aktiviti fotomangkin telah diperiksa. Corak pembelauan sinar-x (XRD) daripada sampel -sampel membuktikan bahawa kesan nisbah mol Zn meningkat, keamatan puncak pembelauan untuk ZnO semakin naik tetapi keamatan untuk C 3 N 4 semakin kurang. Semua bahan komposit yang disediakan mampu memperluaskan jalur penyerapan di dalam kawasan sinaran tampak disebabkan kehadiran C 3 N 4 dan disokong oleh spectrum DR UV-Vis. Komposit ZnO-C 3 N 4 yang disediakan selanjutnya dikaji di dalam fotomangkin penyingkiran fenol di bawah sinaran tampak selama 5 jam. Kesemua sampel ZnO-C 3 N 4 mempunyai aktiviti yang tinggi berbanding hanya ZnO dengan 1% nisbah mol Zn/C menunjukkan aktiviti fotomangkin tertinggi dalam penyingkiran fenol. Aktiviti tinggi yang dilihat terhadap ZnO-C 3 N 4 berkemungkinan disebabkan peranan ZnO untuk membantutkan penggabungan semula lubang elektron dan C 3 N 4 untuk memperluaskan penyerapan ZnO di dalam kawasan sinaran tampak. [1 -9]. The ZnO has been investigated due to its unique property of wide band gap (3.37 eV), excitat...

show abstract

Section: Photocatalytic Activity Testmentioning

confidence: 98%

ENHANCED ACTIVITY OF C3N4 WITH ADDITION OF ZnO FOR PHOTOCATALYTIC REMOVAL OF PHENOL UNDER VISIBLE LIGHT

Hussin¹,

Lintang²,

Yuliati

2016

MJAS

View full text Add to dashboard Cite

show abstract

“…For instance, to enhance the photocurrent and photocatalytic activity, Luo et al [113] reported rGO-hierarchical ZnO hollow sphere composites through a 15-min ultrasonic treatment in which the conjunction between rGO and ZnO could be attributed to electronic interaction between the components. Zhang et al [114] have prepared a ZnO-CNT heterostructure via a hydrothermal route.…”

Section: Fabrication Of Hierarchical Zno-based Nanocompositesmentioning

confidence: 99%

A Review on the Fabrication of Hierarchical ZnO Nanostructures for Photocatalysis Application

et al. 2016

View full text Add to dashboard Cite

Semiconductor photocatalysis provides potential solutions for many energy and environmental-related issues. Recently, various semiconductors with hierarchical nanostructures have been fabricated to achieve efficient photocatalysts owing to their multiple advantages, such as high surface area, porous structures, as well as enhanced light harvesting. ZnO has been widely investigated and considered as the most promising alternative photocatalyst to TiO 2 . Herein, we present a review on the fabrication methods, growth mechanisms and photocatalytic applications of hierarchical ZnO nanostructures. Various synthetic strategies and growth mechanisms, including multistep sequential growth routes, template-based synthesis, template-free self-organization and precursor or self-templating strategies, are highlighted. In addition, the fabrication of multicomponent ZnO-based nanocomposites with hierarchical structures is also included. Finally, the application of hierarchical ZnO nanostructures and nanocomposites in typical photocatalytic reactions, such as pollutant degradation and H 2 evolution, is reviewed.

show abstract

“…Interestingly, this aspect necessitated their usage as antibacterial agents, noxious to microorganisms, and hold good biocompatibility to human cells [10]. Synthesis of ZnO particles with a precipitation method in alcohol solution is the most commonly used and promising lowcost route [11][12][13]. However, ZnO particles aggregate easily in solution due to van der Waals forces and surface effects [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zinc Oxide/Graphene Oxide Nanocomposites as Antibacterial Materials Against Staphylococcus Aureus and Escherichia Coli

Hieu¹

2018

JST

View full text Add to dashboard Cite

New materials with good antibacterial activity and less toxicity to other species have attracted numerous research interests. Modified Hummers method was used for preparing graphene oxide (GO). Zinc oxide/graphene oxide (ZnO/GO) nanocomposites were synthesized with three different ratios (0.5:1, 1:1, and 2:1) by solution precipitation method. The ZnO/GO nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, Brunauer-Emmett-Tellerspecific surface area, and transmission electron microscopy image. The characterization results showed that ZnO nanoparticles with a mean size of 12-18 nm were randomly decorated on the surfaces and edges of GO sheets. ZnO/GO 1:1 with a high specific surface area of 65 m 2 /g was obtained. The antibacterial activity of ZnO, GO, and ZnO/GO was tested against Gram negative bacteria escherichia coli (E. coli) and Gram positive bacteria staphylococcus aureus (S. aureus) using well diffusion method. The test results confirmed that antibacterial activity of ZnO/GO was higher than that of GO and ZnO. Additionally, the ZnO/GO with the ratio of 1:1 is the strongest activity and more active against S. aureus than against E. coli and minimal inhibitory concentration (MIC) value of ZnO/GO 1:1 is 80 µg/mL for S. aureus and 160 µg/mL for E. coli. This novel nanocomposite could be used as a potential material for antimicrobial application.

show abstract

Reduced Graphene Oxide-Hierarchical ZnO Hollow Sphere Composites with Enhanced Photocurrent and Photocatalytic Activity

Cited by 437 publications

References 49 publications

ENHANCED ACTIVITY OF C3N4 WITH ADDITION OF ZnO FOR PHOTOCATALYTIC REMOVAL OF PHENOL UNDER VISIBLE LIGHT

ENHANCED ACTIVITY OF C3N4 WITH ADDITION OF ZnO FOR PHOTOCATALYTIC REMOVAL OF PHENOL UNDER VISIBLE LIGHT

A Review on the Fabrication of Hierarchical ZnO Nanostructures for Photocatalysis Application

Synthesis of Zinc Oxide/Graphene Oxide Nanocomposites as Antibacterial Materials Against Staphylococcus Aureus and Escherichia Coli

Contact Info

Product

Resources

About