A review on the influence of chemical modification on the performance of adsorbents

Abegunde, Segun Michael; Idowu, Kayode Solomon; Adejuwon, Olorunsola Morayo; Adeyemi-Adejolu, Tinuade

doi:10.1016/j.resenv.2020.100001

Cited by 92 publications

(53 citation statements)

References 128 publications

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“…A great number of investigations have been reported demonstrating the role of surface chemistry of carbon materials, such as graphene, on CO 2 adsorption [ 5 , 6 , 7 , 8 ]. Relatively simple and numerous methods including physical or chemical activation are currently known for the modification of the surface chemistry of graphene along with the deep influence that it exerts in the properties of the resulting materials [ 9 , 10 ]. In general, physical activation is performed at high temperature (>700 °C) in a CO 2 or steam atmosphere, and it consists of oxidation of carbon-based products under a stream of an oxidizing gas such as water vapor, oxygen, and carbon dioxide [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…In other cases, the adsorbent must be fixed in a synthetic polymer matrix and/or grafted onto an inorganic carrier material such as silica in order to obtain particles with the required mechanical properties. Different ways of manipulating biomass adsorbents to improve various aspects of biosorption have been described by several authors [ 232 , 233 , 234 , 235 , 236 , 237 ].…”

Section: Factors Affecting Adsorption Processmentioning

confidence: 99%

Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021)

2021

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The primary, most obvious parameter indicating water quality is the color of the water. Not only can it be aesthetically disturbing, but it can also be an indicator of contamination. Clean, high-quality water is a valuable, essential asset. Of the available technologies for removing dyes, adsorption is the most used method due to its ease of use, cost-effectiveness, and high efficiency. The adsorption process is influenced by several parameters, which are the basis of all laboratories researching the optimum conditions. The main objective of this review is to provide up-to-date information on the most studied influencing factors. The effects of initial dye concentration, pH, adsorbent dosage, particle size and temperature are illustrated through examples from the last five years (2017–2021) of research. Moreover, general trends are drawn based on these findings. The removal time ranged from 5 min to 36 h (E = 100% was achieved within 5–60 min). In addition, nearly 80% efficiency can be achieved with just 0.05 g of adsorbent. It is important to reduce adsorbent particle size (with Φ decrease E = 8–99%). Among the dyes analyzed in this paper, Methylene Blue, Congo Red, Malachite Green, Crystal Violet were the most frequently studied. Our conclusions are based on previously published literature.

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“…Santos et al, (2012) avaliaram a capacidade máxima de adsorção de Cromo (III) em bagaço de cana e observaram que a quantidade adsorvida aumentou de 20,34 mg. g -1 com bagaço de cana-de-açúcar bruto para 58,00 mg. g -1 com bagaço de cana modificado quimicamente. Abegunde et al, (2020) o tratamento com ácido induz uma carga positiva na superfície e, em seguida, aumenta a adsorção de íons metálicos carregados positivamente. Rehman et al, (2019), afirmam que a modificação da superfície do adsorvente, aumenta a natureza hidrofílica da superfície do adsorvente, reduzindo o conteúdo mineral e aumentando principalmente a concentração de grupos hidroxila, carboxílicos e fenólicos.…”

Section: Metodologiaunclassified

Adsorção De Cobre Presente Em Solução Aquosa Por Adsorvente De Casca De Laranja Seco E Modificado Com Hcl. / Copper Adsorption Present in Aqueous Solution by Dry Orange Shell Adsorbent and Modified With HCL

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A review on the influence of chemical modification on the performance of adsorbents

Cited by 92 publications

References 128 publications

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

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

Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021)

Adsorção De Cobre Presente Em Solução Aquosa Por Adsorvente De Casca De Laranja Seco E Modificado Com Hcl. / Copper Adsorption Present in Aqueous Solution by Dry Orange Shell Adsorbent and Modified With HCL

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