scholarly journals From two-dimensional graphene oxide to three-dimensional honeycomb-like Ni 3 S 2 @graphene oxide composite: insight into structure and electrocatalytic properties

2017 ◽  
Vol 4 (12) ◽  
pp. 171409 ◽  
Author(s):  
Xinting Wei ◽  
Yueqiang Li ◽  
Wenli Xu ◽  
Kaixuan Zhang ◽  
Jie Yin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Three Dimensional ◽  
Charge Transfer Resistance ◽  
Photoelectrochemical Cells ◽  
One Pot ◽  
Transfer Resistance ◽  
3D Graphene ◽  
Practical Applications ◽  
Oxide Composite ◽  
Solar Water Splitting

Three-dimensional (3D) graphene composites have drawn increasing attention in energy storage/conversion applications due to their unique structures and properties. Herein, we synthesized 3D honeycomb-like Ni 3 S 2 @graphene oxide composite (3D honeycomb-like Ni 3 S 2 @GO) by a one-pot hydrothermal method. We found that positive charges of Ni 2+ and negative charges of NO 3 − in Ni(NO 3 ) 2 induced a transformation of graphene oxide with smooth surface into graphene oxide with wrinkled surface (w-GO). The w-GO in the mixing solution of Ni(NO 3 ) 2 /thioacetamide/H 2 O evolved into 3D honeycomb-like Ni 3 S 2 @GO in solvothermal process. The GO effectively inhibited the aggregation of Ni 3 S 2 nanoparticles. Photoelectrochemical cells based on 3D Ni 3 S 2 @GO synthesized at 60 mM l −1 Ni(NO 3 ) 2 exhibited the best energy conversion efficiency. 3D Ni 3 S 2 @GO had smaller charge transfer resistance and larger exchange current density than pure Ni 3 S 2 for iodine reduction reaction. The cyclic stability of 3D honeycomb-like Ni 3 S 2 @GO was good in the iodine electrolyte. Results are of great interest for fundamental research and practical applications of 3D GO and its composites in solar water-splitting, artificial photoelectrochemical cells, electrocatalysts and Li-S or Na-S batteries.

Three-Dimensional Holey-Graphene Architectures for Highly Sensitive Enzymatic Electrochemical Determination of Hydrogen Peroxide

2019 ◽  
Vol 19 (11) ◽  
pp. 7404-7409 ◽  
Author(s):  
Aihua Jing ◽  
Gaofeng Liang ◽  
Hao Shi ◽  
Yixin Yuan ◽  
Quanxing Zhan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Peroxide ◽  
Graphene Oxide ◽  
Three Dimensional ◽  
Electrochemical Determination ◽  
High Specific Surface Area ◽  
3D Graphene ◽  
Practical Applications ◽  
Transmission Electron ◽  
Mild Defect

Three-dimensional (3D) graphene with high specific surface area, excellent conductivity and designed porosity is essential for many practical applications. Herein, holey graphene oxide with nano pores was facilely prepared via a convenient mild defect-etching reaction and then fabricated to 3D nanostructures via a reduction method. Based on the 3D architectures, a novel enzymatic hydrogen peroxide sensor was successfully fabricated. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to characterize the 3D holey graphene oxide architectures (3DHGO). Cyclic voltammetry (CV) was used to evaluate the electrochemical performance of 3DHGO at glassy carbon electrode (GCE). Excellent electrocatalytic activity to the reduction of H2O2 was observed, and a linear range of 5.0×10-8~5.0×10-5 M with a detection limit of 3.8×10-9 M was obtained. These results indicated that 3DHGO have potential as electrochemical biosensors.

One-pot hydrothermal synthesis of Ag-reduced graphene oxide composite with ionic liquid

2011 ◽  
Vol 21 (21) ◽  
pp. 7795 ◽  
Author(s):  
Jianfeng Shen ◽  
Min Shi ◽  
Bo Yan ◽  
Hongwei Ma ◽  
Na Li ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Graphene Oxide ◽  
Hydrothermal Synthesis ◽  
Reduced Graphene Oxide ◽  
One Pot ◽  
Oxide Composite ◽  
Reduced Graphene

3D Graphene Oxide Hydrogel Derived from Waste Toner as Adsorbent

2021 ◽  
Vol 21 (10) ◽  
pp. 5275-5281
Author(s):  
Zhengshan Tian ◽  
Lijuan Sun ◽  
Hao Tian ◽  
Kesheng Cao ◽  
Suzhen Bai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Removal Efficiency ◽  
Raw Materials ◽  
Three Dimensions ◽  
One Pot ◽  
Adsorptive Property ◽  
3D Graphene ◽  
Hummers Method ◽  
Removal Capacity ◽  
Living Things

Waste toner powders are considered as hazardous materials to human and living things, and should be properly recycled by many effective ways due to their fine particle sizes and complex components. In this paper, waste toner powders were used as raw materials to successfully synthesize three dimensions (3D) graphene oxide (GO) hydrogel by means of a one-pot chemical transformation based on the improved Hummers’ method. The obtained 3D GO hydrogel has porous structure and abundant oxygen-containing functional groups because of the inherent 3D solid structure of waste toner powder and the strong oxidation process of the improved Hummers’ method. Interestingly, the as-prepared 3D GO hydrogel with excellent adsorptive property could quickly remove Pb(II) ions (100 mg/L, removal efficiency of 96% and removal capacity of 144 mg/g) and methylene blue (50 mg/L, removal efficiency of 97% and removal capacity of 48 mg/g) from water, respectively. The preparation process of 3D GO hydrogel was simple and easy to operate, and the output can be moderately mass produced, thus it would provide a new and effective disposal way for the recycling and reusing of waste toner.

One-Pot Transformation of Waste Toner Powder into 3D Graphene Oxide Hydrogel

2018 ◽  
Vol 7 (1) ◽  
pp. 496-501 ◽  
Author(s):  
Zhengshan Tian ◽  
Kesheng Cao ◽  
Suzhen Bai ◽  
Guoxu He ◽  
Jitao Li
Keyword(s):  
Graphene Oxide ◽  
One Pot ◽  
3D Graphene

scholarly journals Cellulose nanocrystals/graphene oxide composite for the adsorption and removal of levofloxacin hydrochloride antibiotic from aqueous solution

2020 ◽  
Vol 7 (10) ◽  
pp. 200857 ◽  
Author(s):  
Junhong Tao ◽  
Jie Yang ◽  
Chengxiao Ma ◽  
Junfeng Li ◽  
Keqing Du ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Cellulose Nanocrystals ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Oxide Composite

Residual antibiotics in water are often persistent organic pollutants. The purpose of this study was to prepare a cellulose nanocrystals/graphene oxide composite (CNCs-GO) with a three-dimensional structure for the removal of the antibiotic levofloxacin hydrochloride (Levo-HCl) in water by adsorption. The scanning electron microscope, Fourier transform infrared (FT-IR), energy-dispersive spectroscopy, X-ray photoelectron spectroscopy and other characterization methods were used to study the physical structure and chemical properties of the CNCs-GO. The three-dimensional structure of the composite material rendered a high surface area and electrostatic attraction, resulting in increased adsorption capacity of the CNCs-GO for Levo-HCl. Based on the Box–Behnken design, the effects of different factors on the removal of Levo-HCl by the CNCs-GO were explored. The composite material exhibited good antibiotic adsorption capacity, with a removal percentage exceeding 80.1% at an optimal pH of 4, the adsorbent dosage of 1.0 g l −1 , initial pollutant concentration of 10.0 mg l −1 and contact time of 4 h. The adsorption isotherm was well fitted by the Sips model, and kinetics studies demonstrated that the adsorption process conformed to a quasi-second-order kinetics model. Consequently, the as-synthesized CNCs-GO demonstrates good potential for the effective removal of antibiotics such as levofloxacin hydrochloride from aqueous media.

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