scholarly journals Solar light assisted green synthesis of photoreduced graphene oxide for the high-efficiency adsorption of anionic dyes

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53362-53372 ◽  
Author(s):  
Yani Gong ◽  
Chengbing Qin ◽  
Wenjun He ◽  
Zhixing Qiao ◽  
Guofeng Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Efficiency ◽  
Organic Dyes ◽  
Chemical Properties ◽  
High Specific Surface Area ◽  
Polluted Water ◽  
Anionic Dyes ◽  
Environmental Friendliness ◽  
Physical And Chemical ◽  
And Chemical Properties

Graphene oxide (GO) with unique physical and chemical properties, such as high specific surface area, chemical stability and environmental friendliness, has been considered as an excellent adsorbent to remove organic dyes from polluted water.

scholarly journals Assessment of Graphene Oxide and Nanoclay Based Hybrid Filler in Chlorobutyl-Natural Rubber Blend for Advanced Gas Barrier Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1098
Author(s):  
Jibin Keloth Paduvilan ◽  
Prajitha Velayudhan ◽  
Ashin Amanulla ◽  
Hanna Joseph Maria ◽  
Allisson Saiter-Fourcin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Black ◽  
Natural Rubber ◽  
Gas Permeability ◽  
Chemical Properties ◽  
Barrier Properties ◽  
Hybrid Filler ◽  
Physical And Chemical ◽  
Chlorobutyl Rubber ◽  
And Chemical Properties

Nanomaterials have engaged response from the scientific world in recent decades due to their exceptional physical and chemical properties counter to their bulk. They have been widely used in a polymer matrix to improve mechanical, thermal, barrier, electronic and chemical properties. In rubber nanocomposites, nanofillers dispersion and the interfacial adhesion between polymer and fillers influences the composites factual properties. In the present work, a comparison of the hybrid effects of carbon black with two different nanofillers (graphene oxide and nanoclay) was studied. The 70/30 composition of chlorobutyl rubber/natural rubber elastomer blend was taken as per the blend composition optimized from our previous studies. The hybrid effects of graphene oxide and nanoclay in dispersing the nanofillers were studied mainly by analyzing nanocomposite barrier properties. The results confirm that the combined effect of carbon black with graphene oxide and nanoclay could create hybrid effects in decreasing the gas permeability. The prepared nanocomposites which partially replace the expensive chlorobutyl rubber can be used for tyre inner liner application. Additionally, the reduction in the amount of carbon black in the nanocomposite can be an added advantage of considering the environmental and economic factors.

scholarly journals Graphene Oxide and Polyethyleneimine Cooperative Construct Ionic Imprinted Cellulose Nanocrystals Aerogel for Selective Adsorption of Dy(III)

2021 ◽  
Author(s):  
Xudong Zheng ◽  
Wen Sun ◽  
Ang Li ◽  
Bin Wang ◽  
Rong Jiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Rare Earth ◽  
Cellulose Nanocrystals ◽  
Selective Adsorption ◽  
Chemical Properties ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Because of dysprosium's unique physical and chemical properties and limited supply, the price of rare earth dysprosium has been high in recent years. Therefore, the study of the method of high efficiency selective separation of dysprosium has the double value of scientific research and practical economy. In this paper, we used periodic cellulose nanocrystals as the basic structure, polyethylenimine and graphene oxide were introduced, combined with imprinting technology, to construct porous imprinted aerogel and use it for selective adsorption of Dy(III). The physical and chemical properties were characterized by SEM, TEM, FT-IR and TGA. It was proved that both polyethylenimine and graphene oxide were crosslinked effectively with cellulose nanocrystals. Adsorption experiments showed that the composite imprinted aerogel could selectively adsorb dysprosium effectively, and the maximum adsorption capacity for Dy(III) was 36.495 mg g− 1. The reproducibility experiment showed that aerogel had good regeneration ability. In conclusion, cellulose nanocrystals aerogel, which is environmentally friendly, efficient and repeatable, is expected to provide a new direction for the recovery of rare earth elements.

scholarly journals Controllable reduction of graphene oxide by electron-beam irradiation

RSC Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 3597-3604 ◽  
Author(s):  
Yu Yang ◽  
Liang Chen ◽  
De-Yuan Li ◽  
Ruo-Bing Yi ◽  
Jia-Wei Mo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electron Beam ◽  
Oxygen Content ◽  
Electron Beam Irradiation ◽  
Chemical Properties ◽  
Suspension Stability ◽  
Physical And Chemical Properties ◽  
Beam Irradiation ◽  
Physical And Chemical ◽  
And Chemical Properties

The oxygen content of graphene oxide (GO) is directly related to its physical and chemical properties, such as hydrophilicity, suspension stability, adsorption, and ion-sieving ability of GO membranes.

scholarly journals Detecting Fingerprints of Waterborne Bacteria on a Sensor

Chemosensors ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 33 ◽  
Author(s):  
Saylan ◽  
Erdem ◽  
Cihangir ◽  
Denizli
Keyword(s):  
Large Scale ◽  
High Selectivity ◽  
Chemical Properties ◽  
Surface Proteins ◽  
Polluted Water ◽  
Label Free ◽  
Recognition Element ◽  
Modification Method ◽  
Physical And Chemical ◽  
And Chemical Properties

Human fecal contamination is a crucial threat that results in difficulties in access to clean water. Enterococcus faecalis is a bacteria which is utilized as an indicator in polluted water. Nevertheless, existing strategies face several challenges, including low affinity and the need for labelling, which limit their access to large scale applications. Herein, a label-free fingerprint of the surface proteins of waterborne bacteria on a sensor was demonstrated for real-time bacteria detection from aqueous and water samples. The kinetic performance of the sensor was evaluated and shown to have a range of detection that spanned five orders of magnitude, having a low detection limit (3.4 × 104 cfu/mL) and a high correlation coefficient (R2 = 0.9957). The sensor also designated a high selectivity while other competitor bacteria were employed. The capability for multiple usage and long shelf-life are superior to other modalities. This is an impressive surface modification method that uses the target itself as a recognition element, ensuring a broad range of variability to replicate others with different structure, size and physical and chemical properties.

Progress of Graphene-Based Hydrogel

2016 ◽  
Vol 852 ◽  
pp. 714-719
Author(s):  
Yu Xiang ◽  
Li Bin Liu ◽  
Zhao Dang ◽  
Ting Li
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Two Dimensional ◽  
Reduced Graphene ◽  
Physical And Chemical ◽  
Significant Attention ◽  
And Chemical Properties

Graphene, a typical two-dimensional planar monolayer of sp2carbon atoms, has attracted significant attention due to its outstanding physical and chemical properties. Nowadays, many graphene-based composites have been synthesized. Among them, graphene hydrogels (including graphene oxide hydrogel and reduced graphene oxide hydrogel) as a kind of graphene-based composites have a wide application prospect. In this paper, the progresses of graphene-based hydrogels are reviewed, and the prospects for the development of graphene-based hydrogels are also discussed.

scholarly journals Metal–organic frameworks (MOFs) based nanofiber architectures for the removal of heavy metal ions

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1433-1450
Author(s):  
Heja Ibrahim Adil ◽  
Mohammad R. Thalji ◽  
Suhad A. Yasin ◽  
Ibtisam A. Saeed ◽  
Mohammed A. Assiri ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Organic Frameworks ◽  
Chemical Properties ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Metal Organic ◽  
Physical And Chemical ◽  
And Chemical Properties

Metal–organic frameworks (MOFs) are promising and effective materials for removing heavy metal ions from contaminated water owing to their high porosity, remarkable physical and chemical properties, and high specific surface area.

scholarly journals Graphene Oxide and Polyethyleneimine Cooperative Construct Ionic Imprinted Cellulose Nanocrystals Aerogel for Selective Adsorption of Dy(III)

2021 ◽  
Author(s):  
Xudong Zheng ◽  
Wen Sun ◽  
Ang Li ◽  
Bin Wang ◽  
Rong Jiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Rare Earth ◽  
Cellulose Nanocrystals ◽  
Selective Adsorption ◽  
Chemical Properties ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Because of dysprosium's unique physical and chemical properties and limited supply, the price of rare earth dysprosium has been high in recent years. Therefore, the study of the method of high efficiency selective separation of dysprosium has the double value of scientific research and practical economy. In this paper, we used periodic cellulose nanocrystals as the basic structure, polyethylenimine and graphene oxide were introduced, combined with imprinting technology, to construct porous imprinted aerogel and use it for selective adsorption of Dy(III). The physical and chemical properties were characterized by SEM, TEM, FT-IR and TGA. It was proved that both polyethylenimine and graphene oxide were crosslinked effectively with cellulose nanocrystals. Adsorption experiments showed that the composite imprinted aerogel could selectively adsorb dysprosium effectively, and the maximum adsorption capacity for Dy(III) was 39.027 mg g− 1. The reproducibility experiment showed that aerogel had good regeneration ability. In conclusion, cellulose nanocrystals aerogel, which is environmentally friendly, efficient and repeatable, is expected to provide a new direction for the recovery of rare earth elements.

The Effect of Fe3+ on Microbial Growth and Physical and Chemical Properties of Activated Sludge

2013 ◽  
Vol 864-867 ◽  
pp. 1319-1322
Author(s):  
Shan Hong Lan ◽  
Rui Chen ◽  
Ping Ma ◽  
Cong Cong Li ◽  
Hui Xia Lan
Keyword(s):  
Activated Sludge ◽  
Microbial Growth ◽  
High Efficiency ◽  
Removal Rate ◽  
Chemical Properties ◽  
Lag Phase ◽  
Logarithmic Phase ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

The method of activated sludge has been widely used in the process of sewage treatment for its high-efficiency and low-consumption. The effect of Fe3+ on microbial growth and physical and chemical properties of activated sludge were studied to obtain relevant parameters for the running of activated sludge system in this paper. Firstly, study on the effect of Fe3+ on microbial growth was carried out. The experiment results showed that the lag phase of microbial growth was obviously reduced with the presence of Fe3+, obtaining advancing into the logarithmic phase. Whats more, the value of OD600 reached to the maximum of 0.615 at 12h when the concentration of Fe3+ was 30mg/L. Secondly, the effects of Fe3+ on the wastewater treatment and that of the performance index include SVI and MLSS were studied. The results indicated that SVI decreased with increasing the dosages of Fe3+,while MLSS and removal rate of COD obviously increased which reach to the maximum of 88.21% when the concentration of Fe3+ was 30mg/L.

scholarly journals Accelerated Synthesis of Graphene Oxide from Graphene

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 551
Author(s):  
Mariana C. F. Costa ◽  
Valeria S. Marangoni ◽  
Pei Rou Ng ◽  
Hang T. L. Nguyen ◽  
Alexandra Carvalho ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Chemical Properties ◽  
Industrial Applications ◽  
Graphite Oxidation ◽  
Alternative Approach ◽  
Graphene Flakes ◽  
Superior Surface ◽  
Physical And Chemical ◽  
Modified Hummers Method ◽  
And Chemical Properties

Graphene oxide (GO) is an oxygenated functionalized form of graphene that has received considerable attention because of its unique physical and chemical properties that are suitable for a large number of industrial applications. Herein, GO is rapidly obtained directly from the oxidation of graphene using an environmentally friendly modified Hummers method. As the starting material consists of graphene flakes, intercalant agents are not needed and the oxidation reaction is enhanced, leading to orders of magnitude reduction in the reaction time compared to the conventional methods of graphite oxidation. With a superior surface area, the graphene flakes are quickly and more homogeneously oxidized since the flakes are exposed at the same extension to the chemical agents, excluding the necessity of sonication to separate the stacked layers of graphite. This strategy shows an alternative approach to quickly producing GO with different degrees of oxidation that can be potentially used in distinct areas ranging from biomedical to energy storage applications.

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