scholarly journals Enhanced Adsorption and Removal of Ciprofloxacin on Regenerable Long TiO2Nanotube/Graphene Oxide Hydrogel Adsorbents

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yuan Zhuang ◽  
Fei Yu ◽  
Jie Ma
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
3D Structure ◽  
Regeneration Ability ◽  
Graphene Sheets ◽  
Simple Method ◽  
Adsorption Capacities ◽  
Reduced Graphene ◽  
Enhanced Adsorption ◽  
Better Than

To improve the adsorption performance and regeneration ability of adsorbent, a simple method was designed to synthesize long TiO2nanotube/reduced graphene oxide (rGO-TON) hydrogel, which has good adsorption and regeneration capacity toward ciprofloxacin. rGO-TON hydrogel could form 3D structure, which makes the separation and regeneration of adsorbent easy. For comparison, commercial P25 particle is used to prepare composite hydrogel with rGO; the results showed that TiO2nanotube supports the graphene sheets better than P25 particles, which would reduce the agglomeration of graphene sheets. rGO-TON have larger specific surface area (138.2 m2/g) than rGO-P25 (79.4 m2/g). In this paper, ciprofloxacin was chosen as target pollutants, the rGO-TON obtain excellent adsorption capacity, and the maximum adsorption capacities of rGO-TON for ciprofloxacin calculated from Langmuir model are 178.6 mg/g (R2=0.9929), 181.8 mg/g (R2=0.9954), and 108.7 mg/g (R2=0.9964) for graphene oxide (GO), GO-TON, and GO-P25, respectively. In regeneration, the adsorption capacity of rGO-TON and rGO-P25 has little reduced after 5 cycles, while the adsorption capacity of rGO decreases to below 100 mg/g. Results of this work are of great significance for environmental applications of regenerable long TiO2nanotube/graphene oxide hydrogel as a promising adsorbent nanomaterial for antibiotic pollutants from aqueous solutions.

scholarly journals Alginate/graphene double-network nanocomposite hydrogel beads with low-swelling, enhanced mechanical properties, and enhanced adsorption capacity

2016 ◽  
Vol 4 (28) ◽  
pp. 10885-10892 ◽  
Author(s):  
Yuan Zhuang ◽  
Fei Yu ◽  
Hong Chen ◽  
Jie Zheng ◽  
Jie Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Nanocomposite Hydrogel ◽  
Double Network ◽  
Hydrogel Beads ◽  
Reduced Graphene ◽  
Enhanced Adsorption

We designed and prepared a novel alginate/reduced graphene oxide double-network hydrogel and investigated its mechanical properties, stability and adsorption capacity in comparison with a single network.

Three-dimensional bandgap-tuned Ag2S quantum dots/reduced graphene oxide composites with enhanced adsorption and photocatalysis under visible light

2018 ◽  
Vol 8 (20) ◽  
pp. 5225-5235 ◽  
Author(s):  
Qian Wu ◽  
Ming Zhou ◽  
Yu Gong ◽  
Qijun Li ◽  
Mingyang Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Size Effect ◽  
Visible Light ◽  
Three Dimensional ◽  
Quantum Size ◽  
Reduced Graphene ◽  
Ag2s Quantum Dots ◽  
Enhanced Adsorption ◽  
Oxide Composites

Tuning Ag2S bandgap by quantum size effect and incorporation with rGO to form a three-dimensional composite enhances adsorption and photocatalysis under visible-light.

Free-standing reduced graphene oxide/MnO2–reduced graphene oxide–carbon nanotube nanocomposite flexible membrane as an anode for improving lithium-ion batteries

2017 ◽  
Vol 19 (11) ◽  
pp. 7498-7505 ◽  
Author(s):  
Yong Li ◽  
Daixin Ye ◽  
Bin Shi ◽  
Wen Liu ◽  
Rui Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
3D Structure ◽  
Lithium Ion ◽  
Rate Performance ◽  
Free Standing ◽  
Flexible Membrane ◽  
Reduced Graphene

Free-standing rGO/MnO2–rGO–CNT flexible membrane with a 2D/3D structure shows improved cycling and rate performance at flat and bending states.

An effective non-covalent grafting approach to functionalize individually dispersed reduced graphene oxide sheets with high grafting density, solubility and electrical conductivity

Nanoscale ◽  
2015 ◽  
Vol 7 (8) ◽  
pp. 3548-3557 ◽  
Author(s):  
Hao Wang ◽  
Shu-Guang Bi ◽  
Yun-Sheng Ye ◽  
Yang Xue ◽  
Xiao-Lin Xie ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphene Sheets ◽  
Grafting Density ◽  
Reduced Graphene ◽  
Covalent Grafting ◽  
Potential Applications ◽  
Graphene Oxide Sheets

Polymer-functionalized reduced graphene oxide (polymer-FG), produced as individually dispersed graphene sheets, offers new possibilities for the production of nanomaterials that are useful for a broad range of potential applications.

scholarly journals Microwave Synthesis of Zinc Oxide/Reduced Graphene Oxide Hybrid for Adsorption-Photocatalysis Application

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Fatin Saiha Omar ◽  
Huang Nay Ming ◽  
Syed Muhamad Hafiz ◽  
Lim Hong Ngee
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Average Length ◽  
Hexagonal Phase ◽  
Zno Nanorods ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Enhanced Adsorption ◽  
Xrd Patterns

This work reports on synthesis of zinc oxide/reduced graphene oxide (ZnO/rGO) nanocomposites in the presence of diethylenetriamine (DETA) via a facile microwave method. The X-ray diffraction (XRD) patterns of the nanocomposites correspond to the ZnO hexagonal phase wurtzite structure. The high-resolution transmission electron microscopy (HRTEM) images revealed that the ZnO nanorods, with an average length : diameter ratio of 10, were successfully deposited on the rGO sheets. Under the irradiation of sunlight, the nanocomposites showed enhanced adsorption-photocatalysis by more than twofold and photocurrent response by sixfold compared to the ZnO. The excellent photoactivity performance of the nanocomposites is contributed by smaller ZnO nanorod and the presence of rGO that acts as a photosensitizer by transferring electrons to the conduction band of ZnO within the nanocomposite during sunlight illumination.

Simplified Synthesis of 3D Flexible Reduced Graphene Oxide-Wrapped NiCo2O4 Nanowires for High-Performance Supercapacitor

2018 ◽  
Vol 10 (3) ◽  
pp. 358-364 ◽  
Author(s):  
Chao Pan ◽  
Hongyu Sun ◽  
Jingyi Gao ◽  
Yucai Hu ◽  
Jing Wang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
High Current Density ◽  
Three Dimensional ◽  
Simple Method ◽  
X Ray ◽  
Reduced Graphene

We introduced a simple method to construct novel three-dimensional (3D) flexible hierarchical nanocomposites by combining (1D) NiCo2O4 nanowires with 2D reduced graphene oxide (rGO) sheets. The hierarchical nanocomposite structure of rGO-wrapped NiCo2O4 (rGO-NiCo2O4) was confirmed by X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). The results indicated that NiCo2O4 nanowires were successfully wrapped in rGO and the morphology of the rGO-NiCo2O4 showed a three-dimensional porous structure with NiCo2O4 being homogeneously distributed in the rGO. Given their apparent advantages, these two different nanostructures were evaluated as electrodes for high-performance supercapacitors. These electrodes exhibited a high capacitance of 1824.8 F·g–1 at a current density of 0.5 A·g–1, and an excellent cycling performance extending to 5000 cycles at a high current density of 4 A·g–1. Our results clearly demonstrate that rGO sheets on NiCo2O4 nanowires can substantially improve the capacitive performance of materials and ultimately increase the cycling stability of supercapacitors. The hierarchical binary nanocomposites show excellent electrochemical properties for energy storage applications, evidencing their potential application as supercapacitors.

One-step synthesis of SnO2-reduced graphene oxide (SOG) composites for efficient removal of organic dyes from wastewater

RSC Advances ◽  
2016 ◽  
Vol 6 (102) ◽  
pp. 100636-100642 ◽  
Author(s):  
Wenzhu Yin ◽  
Huaqiang Cao
Keyword(s):  
Graphene Oxide ◽  
Organic Dyes ◽  
Functionalized Graphene ◽  
High Adsorption ◽  
Efficient Removal ◽  
Functionalized Graphene Oxide ◽  
Adsorption Capacities ◽  
Reduced Graphene ◽  
One Step ◽  
Adsorption Rates

In this work, SnO2 functionalized graphene oxide was shown to possess high adsorption capacities and fast adsorption rates for organic dyes over wide pH ranges. Additionally, the adsorbent could be easily regenerated by washing with ethanol.

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