Various Impregnation Methods Used for the Surface  Modification of the Adsorbent: A Review

Girish, C. R.

doi:10.14419/ijet.v7i4.7.20571

Cited by 20 publications

(9 citation statements)

References 63 publications

(60 reference statements)

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“…The reported CO 2 adsorption capacities are in the wide range from 0.1 to 5.91 mmol/g-adsorbent depending on experimental conditions and investigated materials. The typical enthalpy values for chemisorption and for physical adsorption are between 40 and 90 kJ/mol and between 15 and 40 kJ/mol, respectively [67]. This means that CO 2 molecules are more strongly bound to the surface of amine-functionalized solid adsorbents by both chemical reactions and physical interactions with silica support [68].…”

Section: Adsorptionmentioning

confidence: 99%

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Comparison of CO2 Separation Efficiency from Flue Gases Based on Commonly Used Methods and Materials

Ziobrowski

Rotkegel

2022

Materials

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The comparison study of CO2 removal efficiency from flue gases at low pressures and temperatures is presented, based on commonly used methods and materials. Our own experimental results were compared and analyzed for different methods of CO2 removal from flue gases: absorption in a packed column, adsorption in a packed column and membrane separation on polymeric and ceramic membranes, as well as on the developed supported ionic liquid membranes (SILMs). The efficiency and competitiveness comparison of the investigated methods showed that SILMs obtained by coating of the polydimethylsiloxane (PDMS) membrane with 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]) exhibit a high ideal CO2/N2 selectivity of 152, permeability of 2400 barrer and long term stability. Inexpensive and selective SILMs were prepared applying commercial membranes. Under similar experimental conditions, the absorption in aqueous Monoethanolamine (MEA) solutions is much faster than in ionic liquids (ILs), but gas and liquid flow rates in packed column sprayed with IL are limited due to the much higher viscosity and lower diffusion coefficient of IL. For CO2 adsorption on activated carbons impregnated with amine or IL, only a small improvement in the adsorption properties was achieved. The experimental research was compared with the literature data to find a feasible solution based on commercially available methods and materials.

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Section: Adsorptionmentioning

confidence: 99%

“…The impregnated silica have a greater adsorption capacity than grafted silica [67]. Solid adsorbents developed through amine-functionalization adsorbed CO 2 by chemisorption and follow the carbamate formation scheme.…”

Section: Adsorptionmentioning

confidence: 99%

Comparison of CO2 Separation Efficiency from Flue Gases Based on Commonly Used Methods and Materials

Ziobrowski

Rotkegel

2022

Materials

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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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“…The impregnation of ACs with metals such as silver [92], copper [93], aluminum [94], and iron [95] has gained wide interest due to their higher adsorption capacity. Moreover, the impregnated adsorbent can also provide the advantage of stability and favorable regeneration capacity [96].…”

Section: Impregnationmentioning

confidence: 99%

Surface Modified Activated Carbons: Sustainable Bio-Based Materials for Environmental Remediation

et al. 2021

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Global warming and water/air contamination caused by human activities are major challenges in environmental pollution and climate change. The improper discharge of a large amount of agro-forest byproduct is accelerating these issues mainly in developing countries. The burning of agricultural byproducts causes global warming, whereas their improper waste management causes water/air pollution. The conversion of these waste materials into effective smart materials can be considered as a promising strategy in waste management and environmental remediation. Over the past decades, activated carbons (ACs) have been prepared from various agricultural wastes and extensively used as adsorbents. The adsorption capacity of ACs is linked to a well-developed porous structure, large specific surface area, and rich surface functional moieties. Activated carbon needs to increase their adsorption capacity, especially for specific adsorbates, making them suitable for specific applications, and this is possible by surface modifications of their surface chemistry. The modifications of surface chemistry involve the introduction of surface functional groups which can be carried out by various methods such as acid treatment, alkaline treatment, impregnation, ozone treatment, plasma treatment, and so on. Depending on the treatment methods, surface modification mainly affects surface chemistry. In this review, we summarized several modification methods for agricultural-waste-based ACs. In addition, the applications of AC for the adsorption of various pollutants are highlighted.

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Various Impregnation Methods Used for the Surface Modification of the Adsorbent: A Review

Cited by 20 publications

References 63 publications

Comparison of CO2 Separation Efficiency from Flue Gases Based on Commonly Used Methods and Materials

Comparison of CO2 Separation Efficiency from Flue Gases Based on Commonly Used Methods and Materials

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

Surface Modified Activated Carbons: Sustainable Bio-Based Materials for Environmental Remediation

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