Hydrogel-Assisted Delivery of Lipophilic Molecules into Aqueous Milieu for Transdermal Medication Capitalized on Environment-Specific, Regioselective Adsorption of Graphene Oxides

2021 ◽  
Author(s):  
Chongling Cheng ◽  
Wei Bai ◽  
Tonghe Zhu ◽  
Wei Zang ◽  
Sihao Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Media ◽  
Graphene Oxides ◽  
Composite Hydrogels ◽  
Assisted Delivery

Graphene oxide (GO) – laden agarose composite hydrogels (GOACHs) were utilized to deliver lipophilic molecules from organic to aqueous media without alteration of the lipophilic nature of the molecules and...

scholarly journals Catalase-like properties of multilayer graphene oxides and their modified forms

Surface ◽  
2020 ◽  
Vol 12(27) ◽  
pp. 251-262
Author(s):  
K. V. Voitko ◽  
◽  
O. M. Bakalinska ◽  
Yu. V. Goshovska ◽  
Yu. I. Sementsov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Catalytic Reaction ◽  
Active Sites ◽  
Aqueous Media ◽  
Reaction Medium ◽  
Multilayer Graphene ◽  
Graphene Oxides ◽  
Modified Forms

The catalytic system, that mimets catalase enzyme such as “multilayer graphene oxide /peroxide molecule” in aqueous media was investigated. The main factors that influence on catalyst’s effectiveness were determining. The catalytic activity of as-synthesized multilayered graphene oxides, and their modified forms (oxidized and nitrogen doped) were investigated in the decomposition of hydrogen peroxides at room temperature and physiological pHs by measuring the volume of released gases. A phosphate buffer with a pH of 5 to 8 was chosen as the reaction medium. The original and modified samples were characterized using XPS, TPD-MS, Boehm titration analyses. The effect of surface chemistry on the catalytic reaction proceeding has been studied. It was found that catalysis on the graphene plane is determined by the presence of heteroatoms in their structure. The catalytic process takes place in the kinetic zone over the entire accessible surface of the samples. The active sites of the catalysts contain a large amount of both nitrogen and oxygen-containing functional groups. In addition, the surface of graphene oxide is hydrophilic, which enhances the catalytic reaction in an aqueous medium. It has been established that the rate of hydrogen peroxide decomposition by reduced graphene oxide samples is lower than for samples modified with oxygen and nitrogen. The catalase-like activity of graphene increases in alkaline pH up to 7.8. Studies have shown that samples of multilayer graphenes with a high content of functional groups can be an alternative to the catalase enzyme as a catalyst for the decomposition of hydrogen peroxide in physiological solutions.

3D welan gum–graphene oxide composite hydrogels with efficient dye adsorption capacity

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75589-75599 ◽  
Author(s):  
Menghong Yu ◽  
Aixin Song ◽  
Guiying Xu ◽  
Xia Xin ◽  
Jinglin Shen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Self Assembly ◽  
Aqueous Media ◽  
Dye Adsorption ◽  
Welan Gum ◽  
Oxide Composite ◽  
Composite Hydrogels

In this article, welan gum-graphene oxide (GO) composite hydrogels were prepared by simple self-assembly of both components in aqueous media and the effects of GO on the gelation of welan gum were systematically studied.

X-Ray Photoelectron Spectroscopy Study on Reduction of Graphene Oxide with Hydrazine Hydrate

2011 ◽  
Vol 287-290 ◽  
pp. 539-543 ◽  
Author(s):  
Wen Shi Ma ◽  
Jun Wen Zhou ◽  
Xiao Dan Lin
Keyword(s):  
Graphene Oxide ◽  
Hydrazine Hydrate ◽  
Photoelectron Spectroscopy ◽  
Reduction Rate ◽  
Reduction Reaction ◽  
Chemical Compositions ◽  
Total Oxygen ◽  
Graphene Oxides ◽  
X Ray ◽  
Oxygen Groups

Graphene oxide was prepared through Hummers' method，then different reduced graphenes were prepared via reduction of graphene oxide with hydrazine hydrate for 1h、12h and 24h. X-ray photoelectron spectroscopy (XPS) was used for the characterization of graphene oxide and the reduced graphenes. The variation of the contents of carbon in carbon and oxygen functional groups and chemical compositions of graphene oxides were investigated through analysis the content of different carbon atoms in different reduced graphenes. The results showed that the reduction reaction was very fast in the first 1 h, the content of total oxygen bonded carbon atoms decreased from 83.6% to 22.1%, and then after the reduction rate became very slow. After 12h, the content of total oxygen bonded carbon atom is 19.56%, only 2.54% lower than that of 1h’s. At the same time, C-N was introduced in the graphene oxides; this increased the stereo-hindrance for hydrazine hydrate attacking the C-Oxygen groups, thus reduced the reduction rate. After reduction for 24h, there still exists 16.4% oxygen bonded carbon atoms and the total conversion ratio of graphene approaches 70%.

Robust, anti-fatigue, and self-healing graphene oxide/hydrophobically associated composite hydrogels and their use as recyclable adsorbents for dye wastewater treatment

2015 ◽  
Vol 3 (33) ◽  
pp. 17445-17458 ◽  
Author(s):  
Wei Cui ◽  
Jin Ji ◽  
Yi-Feng Cai ◽  
Hang Li ◽  
Rong Ran
Keyword(s):  
Wastewater Treatment ◽  
Graphene Oxide ◽  
Self Healing ◽  
Dye Wastewater ◽  
Composite Hydrogels ◽  
Recyclable Adsorbent

Illustration of a self-healing, anti-fatigue GHA gel being applied as a recyclable adsorbent for dye wastewater treatment.

Preparation of graphene oxide by dry planetary ball milling process from natural graphite

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12657-12668 ◽  
Author(s):  
Pranita Dash ◽  
Tapan Dash ◽  
Tapan Kumar Rout ◽  
Ashok Kumar Sahu ◽  
Surendra Kumar Biswal ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ball Milling ◽  
High Energy ◽  
Milling Process ◽  
Graphene Oxides ◽  
Natural Graphite ◽  
Ball Milling Process ◽  
Planetary Ball Milling

Graphene oxides (GO) with different degrees of oxidation have been prepared by an in-house designed horizontal high energy planetary ball milling process.

Study on graphene-oxide-based polyacrylamide composite hydrogels

2012 ◽  
Vol 43 (9) ◽  
pp. 1476-1481 ◽  
Author(s):  
Jianfeng Shen ◽  
Bo Yan ◽  
Tie Li ◽  
Yu Long ◽  
Na Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Hydrogels

Well-Aligned Graphene Oxide Nanosheets Decorated with Zinc Oxide Nanocrystals for High Performance Photocatalytic Application

2015 ◽  
Vol 14 (03) ◽  
pp. 1550007 ◽  
Author(s):  
K. Kaviyarasu ◽  
C. Maria Magdalane ◽  
E. Manikandan ◽  
M. Jayachandran ◽  
R. Ladchumananandasivam ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
High Performance ◽  
Chemical Reduction ◽  
Visible Region ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Graphene Oxides ◽  
X Ray ◽  
Nanoscale Structures

Graphene oxide (GO) nanosheets modified with zinc oxide nanocrystals were achieved by a green wet-chemical approach. As-obtained products were characterized by XRD, Raman spectra, XPS, HR-TEM, EDS, PL and Photocatalytic studies. XRD studies indicate that the GO nanosheet have the same crystal structure found in hexagonal form of ZnO . The enhanced Raman spectrum of 2D bands confirmed formation of single layer graphene oxides. The gradual photocatalytic reduction of the GO nanosheet in the GO : ZnO suspension of ethanol was studied by using X-ray photoelectron (XPS) spectroscopy. The nanoscale structures were observed and confirmed using high resolution transmission electron microscopy (HR-TEM). The evolution of the elemental composition, especially the various numbers of layers were determined from energy dispersive X-ray spectra (EDS). PL properties of GO : ZnO nanosheet were found to be dependent on the growth condition and the resultant morphology revealed that GO nanosheet were highly transparent in the visible region. The photocatalytic performance of GO : ZnO nanocomposites was performed under UV irradiation. Therefore, the ZnO nanocrystals in the GO : ZnO composite could be applied in gradual chemical reduction and consequently tuning the electrical conductivity of the graphene oxide nanosheet.

Modeling of adsorption behavior of the amine-rich GOPEI aerogel for the removal of As(iii) and As(v) from aqueous media

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56684-56697 ◽  
Author(s):  
Devendra Kumar Singh ◽  
Vijay Kumar ◽  
Vikas Kumar Singh ◽  
Syed Hadi Hasan
Keyword(s):  
Graphene Oxide ◽  
Aqueous Media ◽  
Adsorption Behavior ◽  
Graphene Oxide Aerogel ◽  
Modeling Of Adsorption

In the present study, a PEI cross-linked graphene oxide aerogel (GOPEI) was prepared.

Nitrile-calixarene grafted magnetic graphene oxide for removal of arsenic from aqueous media: Isotherm, kinetic and thermodynamic studies

Chemosphere ◽  
2021 ◽  
Vol 268 ◽  
pp. 129348
Author(s):  
Shahabaldin Rezania ◽  
Muhammad Afzal Kamboh ◽  
Sadaf Sadia Arian ◽  
Abdulwahed F. Alrefaei ◽  
Hussein H. Alkhamis ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Media ◽  
Magnetic Graphene Oxide ◽  
Thermodynamic Studies ◽  
Magnetic Graphene ◽  
Removal Of Arsenic ◽  
Kinetic And Thermodynamic Studies
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