scholarly journals Physical and Chemical Activation of Graphene-Derived Porous Nanomaterials for Post-Combustion Carbon Dioxide Capture

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2419
Author(s):  
Rabita Mohd Firdaus ◽  
Alexandre Desforges ◽  
Mélanie Emo ◽  
Abdul Rahman Mohamed ◽  
Brigitte Vigolo
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanomaterials ◽  
Co2 Adsorption ◽  
Chemical Activation ◽  
Chemical Properties ◽  
Nitrogen Adsorption ◽  
Activation Temperature ◽  
Temperature Activation ◽  
Co2 Adsorption Capacity ◽  
Physical And Chemical

Activation is commonly used to improve the surface and porosity of different kinds of carbon nanomaterials: activated carbon, carbon nanotubes, graphene, and carbon black. In this study, both physical and chemical activations are applied to graphene oxide by using CO2 and KOH-based approaches, respectively. The structural and the chemical properties of the prepared activated graphene are deeply characterized by means of scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometry and nitrogen adsorption. Temperature activation is shown to be a key parameter leading to enhanced CO2 adsorption capacity of the graphene oxide-based materials. The specific surface area is increased from 219.3 m2 g−1 for starting graphene oxide to 762.5 and 1060.5 m2 g−1 after physical and chemical activation, respectively. The performance of CO2 adsorption is gradually enhanced with the activation temperature for both approaches: for the best performances of a factor of 6.5 and 9 for physical and chemical activation, respectively. The measured CO2 capacities are of 27.2 mg g−1 and 38.9 mg g−1 for the physically and chemically activated graphene, respectively, at 25 °C and 1 bar.

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.

Comparative Study of Different Activation Treatments for the Preparation of Activated Carbon: A Mini-Review

2017 ◽  
Vol 100 (3) ◽  
pp. 299-312 ◽  
Author(s):  
Muhammad Imran Din ◽  
Sania Ashraf ◽  
Azeem Intisar
Keyword(s):  
Activated Carbon ◽  
Comparative Study ◽  
Raw Materials ◽  
Chemical Activation ◽  
Comparative Approach ◽  
Adsorption Mechanisms ◽  
Temperature Activation ◽  
Activation Conditions ◽  
Physical And Chemical ◽  
Characterisation Techniques

In this review, various methods of preparation of activated carbon from agricultural and commercial waste material are reviewed. In addition, we also discuss various activation treatments using a comparative approach. The data are organised in tabulated form for ease of comparative study. A review of numerous characterisation techniques is also provided. The effect of time and temperature, activation conditions, carbonisation conditions and impregnation ratios are explained and several physical and chemical activation treatments of raw materials and their impact on the micro- and mesoporous volumes and surface area are discussed. Lastly, a review of adsorption mechanisms of activated carbon (AC) is also provided.

Characterization of Shivirtui Zeolite Modified with Aluminum Oxyhydroxide Nanofibers

2019 ◽  
Vol 942 ◽  
pp. 40-49
Author(s):  
Yulia Murashkina ◽  
Olga B. Nazarenko
Keyword(s):  
Chemical Properties ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Aluminum Oxyhydroxide

Natural zeolite of Shivirtui deposit (Russia) was modified with nanofibers of aluminum oxyhydroxide AlOOH. Aluminum oxyhydroxide nanofibers were produced at the heating and oxidation of aluminum powder with water. The properties of modified zeolite were investigated by means of X-ray diffraction, transmission electronic microscopy, scanning electronic microscopy, low-temperature nitrogen adsorption, thermal analysis, and Fourier transform infrared spectroscopy. It was found that water content in the modified sample of zeolite was about 15 %. Based on the study of the physical and chemical properties, shivirtui zeolite modified with nanofibers of aluminum oxyhydroxide can be proposed for use as a flame-retardant additive to polymers.

scholarly journals Characterization and Modelling Studies of Activated Carbon Produced from Rubber-Seed Shell Using KOH for CO2 Adsorption

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 855 ◽  
Author(s):  
Azry Borhan ◽  
Suzana Yusup ◽  
Jun Wei Lim ◽  
Pau Loke Show
Keyword(s):  
Experimental Data ◽  
Activated Carbon ◽  
Co2 Adsorption ◽  
Chemical Activation ◽  
Freundlich Isotherm ◽  
Nitrogen Adsorption ◽  
Rubber Seed ◽  
Modelling Studies ◽  
Carbon Dioxide Co2 ◽  
Activation Conditions

Global warming due to the emission of carbon dioxide (CO2) has become a serious problem in recent times. Although diverse methods have been offered, adsorption using activated carbon (AC) from agriculture waste is regarded to be the most applicable one due to numerous advantages. In this paper, the preparation of AC from rubber-seed shell (RSS), an agriculture residue through chemical activation using potassium hydroxide (KOH), was investigated. The prepared AC was characterized by nitrogen adsorption–desorption isotherms measured in Micrometrices ASAP 2020 and FESEM. The optimal activation conditions were found at an impregnation ratio of 1:2 and carbonized at a temperature of 700 °C for 120 min. Sample A6 is found to yield the largest surface area of 1129.68 m2/g with a mesoporous pore diameter of 3.46 nm, respectively. Using the static volumetric technique evaluated at 25 °C and 1.25 bar, the maximum CO2 adsorption capacity is 43.509 cm3/g. The experimental data were analyzed using several isotherm and kinetic models. Owing to the closeness of regression coefficient (R2) to unity, the Freundlich isotherm and pseudo-second kinetic model provide the best fit to the experimental data suggesting that the RSS AC prepared is an attractive source for CO2 adsorption applications.

Production of Activated Carbon from Ligin: Optimization Using Response Surface Methodology

2011 ◽  
Vol 213 ◽  
pp. 427-431 ◽  
Author(s):  
Li Jiang ◽  
Fei Ma ◽  
Ai Jun Gu ◽  
Li Jun Zhang
Keyword(s):  
Response Surface Methodology ◽  
Activated Carbon ◽  
Response Surface ◽  
Chemical Activation ◽  
Technological Parameters ◽  
Activation Temperature ◽  
Surface Areas ◽  
Optimum Response ◽  
Temperature Activation ◽  
Central Composite

Activated carbon（AC）were prepared from lignin by chemical activation with sodium hydroxide（NaOH）. The influence of activation temperature，activation time and impregnation ration on the BET surface areas were investigated. Based on the central composite design (CCD) and response surface methodology(RSM)，the optimized technological parameters were as follows: temperature 751°C， time 57min and impregnation ration 2.06, BET surface areas was up to 1437.20 m2/g.The adequacy of the model equation for predicting the optimum response values was verified effectively by the validation.

The recent progress of nitrogen-doped carbon nanomaterials for electrochemical batteries

2018 ◽  
Vol 6 (27) ◽  
pp. 12932-12944 ◽  
Author(s):  
Jingxia Wu ◽  
Zhiyong Pan ◽  
Ye Zhang ◽  
Bingjie Wang ◽  
Huisheng Peng
Keyword(s):  
Electrochemical Properties ◽  
Nitrogen Doping ◽  
Recent Progress ◽  
Carbon Nanomaterials ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Physical And Chemical ◽  
And Chemical Properties

Nitrogen-doping represents a general and effective method in adjusting the physical and chemical properties of carbon nanomaterials. The recent progress in the synthesis of nitrogen-doped carbon nanomaterials and their applications in batteries are carefully discussed with a focus on their electrochemical properties.

scholarly journals PREPARATION AND CHARACTERIZATION OF CARBON FROM THE FRUIT OF BRAZIL NUT TREE ACTIVATED BY PHYSICAL PROCESS

2019 ◽  
Vol 43 (2) ◽  
Author(s):  
Michelle Ferreira da Silva Rimoli ◽  
Roberta Martins Nogueira ◽  
Stela Regina Ferrarini ◽  
Pryscila Machado de Castro ◽  
Evaldo Martins Pires
Keyword(s):  
Activated Carbon ◽  
Raw Materials ◽  
Chemical Properties ◽  
Internal Surface ◽  
Physical Activation ◽  
Brazil Nut ◽  
Internal Surface Area ◽  
Activation Temperature ◽  
Different Temperatures ◽  
Physical And Chemical

ABSTRACT Activated carbon is the name of a big group of materials that presents high degree of porosity and, consequently, an extended internal surface area, with physical and chemical adsorption properties. Innumerous raw materials can be used as precursors, especially biomass. The objective of this study was to obtain activated carbon from physical activation of the fruit of Brazil nut tree (“ouriço”) and to evaluate its physical and chemical properties in function of the differences between the temperatures and atmospheres of activation. The samples were carbonized at 3 different temperatures and the carbons were activated under atmosphere saturated by CO2 or steam. The results showed the influence of activation temperature and atmosphere on physicochemical characteristics of carbon. The carbon from woody Brazil nut seed capsule activated by CO2 and steam at different temperatures had a microporous profile, indicating its use to adsorb organic molecules of small dimensions. Basic characteristic was observed on samples and the carbon produced was thermally stable. Best quality was attributed to carbon activated by steam at 800 °C.

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 CO2 Adsorption on Activated Carbons Prepared from Molasses: A Comparison of Two and Three Parametric Models

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7458
Author(s):  
Karolina Kiełbasa ◽  
Adrianna Kamińska ◽  
Oliwier Niedoba ◽  
Beata Michalkiewicz
Keyword(s):  
Co2 Adsorption ◽  
Activated Carbons ◽  
Error Function ◽  
Chemical Activation ◽  
Parametric Models ◽  
Activation Temperature ◽  
Textural Characteristic ◽  
Fractional Error ◽  
Adsorption Of Co2 ◽  
Best Fit

Activated carbons with different textural characteristic were derived by the chemical activation of raw beet molasses with solid KOH, while the activation temperature was changed in the range 650 °C to 800 °C. The adsorption of CO2 on activated carbons was investigated. Langmuir, Freundlich, Sips, Toth, Unilan, Fritz-Schlunder, Radke-Prausnitz, Temkin-Pyzhev, Dubinin-Radushkevich, and Jovanovich equations were selected to fit the experimental data of CO2 adsorption. An error analysis (the sum of the squares of errors, the hybrid fractional error function, the average relative error, the Marquardt’s percent standard deviation, and the sum of the absolute errors) was conducted to examine the effect of using various error standards for the isotherm model parameter calculation. The best fit was observed to the Radke-Prausnitz model.

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