Isotherm and thermodynamic modelling of malachite green on CO2-activated carbon fibers

Lee, Joon Hyuk; Sim, Su Ji; Kang, Ju Hui; Choi, Sang Sun

doi:10.1016/j.cplett.2021.138962

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…Table 6 presents the maximum sorption capacities for the adsorbents derived from the starting materials through carbon dioxide activation [22][23][24][25]. In the current investigation, notably greater sorption capacities were achieved when compared to the outcomes obtained for biocarbon produced by activating carbon dioxide with solid waste (a nonhydrolyzed polysaccharide) produced during the alcoholic fermentation of maize starch.…”

Section: Adsorption Studymentioning

confidence: 79%

Microwave-Assisted Fabrication of Fugus-Based Biocarbons for Malachite Green and NO2 Removal

Bazan-Wozniak,

Yagmur-Kabas,

Nosal-Wiercińska

et al. 2023

Materials

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The aim of the current study was to produce biocarbons through the activation of carbon dioxide with the extraction residues of the fungus Inonotus obliquus. To achieve this goal, a microwave oven was used to apply three different activation temperatures: 500, 600, and 700 °C. Low-temperature nitrogen adsorption/desorption was employed to determine the elemental composition, acid-base properties, and textural parameters of the resulting carbon adsorbents. Subsequently, the produced biocarbons were evaluated for their efficiency in removing malachite green and NO2. The adsorbent obtained by activation of the precursor in 700 °C had a specific surface area of 743 m2/g. In the aqueous malachite green solution, the highest measured sorption capacity was 176 mg/g. Conversely, under dry conditions, the sorption capacity for NO2 on this biocarbon was 21.4 mg/g, and under wet conditions, it was 40.9 mg/g. According to the experimental findings, surface biocarbons had equal-energy active sites that interacted with the dye molecules. A pseudo-second-order kinetics model yielded the most accurate results, indicating that the adsorption of malachite green was driven by chemisorption. Additionally, the study demonstrates a clear correlation between the adsorption capacity of the biocarbons and the pH level of the solution, as it increases proportionately.

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Section: Adsorption Studymentioning

confidence: 79%

Microwave-Assisted Fabrication of Fugus-Based Biocarbons for Malachite Green and NO2 Removal

Bazan-Wozniak,

Yagmur-Kabas,

Nosal-Wiercińska

et al. 2023

Materials

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“…The utilization of the pseudo-first-order and pseudo-second-order kinetics has been employed to explicate the adsorption behavior [ 22 , 23 , 24 , 25 ]. The pseudo-first-order kinetic model postulates that the adsorption rate is directly proportional to the dissimilarity in the concentration between the solution and the adsorbent surface.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Phenomenon of VOCs Released from the Fiber-Reinforced Plastic Production onto Carbonaceous Surface

et al. 2023

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The manufacturing of fiber-reinforced plastics has been linked to the discharge of volatile organic compounds (VOCs), particularly toluene and benzene, which have been identified as posing substantial risks to human health and the environment. To counteract this issue, activated carbons have been suggested as a means of reducing VOC emissions through adsorption. The objective of this study was to investigate the adsorption characteristics of toluene and benzene onto activated carbons produced from coal (AC) and coconut shells (CAC). The study was carried out in an aqueous medium. The findings revealed that the AC sample with higher surface characteristics exhibited a higher adsorption capacity (toluene: 196.0784 mg g−1 and benzene: 181.8182 mg g−1) in comparison to the CAC sample (toluene: 135.1351 mg g−1 and benzene: 116.2791 mg g−1). The superior adsorption performance of AC on both VOCs can be attributed to its higher surface characteristics. The Langmuir model was found to be more appropriate than the Freundlich model, as indicated by the higher coefficient of determination (R2) value of the Langmuir isotherm (avg. R2 = 0.9669) compared to that of the Freundlich isotherm (avg. R2 = 0.9654), suggesting the use of a monolayer adsorption mechanism. The adsorption kinetics of the samples were analyzed using the pseudo-first-order and pseudo-second-order models, and the former was found to be more fitting, indicating that the rate of adsorption is directly proportional to the concentration difference between the solution and the sample surface. The adsorption process was found to be spontaneous and favorable based on the positive value of ΔG_ads. Furthermore, the adsorption process was endothermic and disordered, as indicated by the positive values of ΔH_ads and ΔS_ads. The regeneration efficiency of all the samples was secured more than 95% upon the fifth cycle.

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“…CO 2 activation can significantly improve the porosity of carbon materials and enhance the specific surface area. Lee et al [59] showed that the porous carbon fiber after CO 2 activation was mainly composed of micropores, and the specific surface area was up to 1012 m 2 g -1 . However, there are also other carbon materials that obtain a large amount of mesoporous structure after CO 2 capture.…”

Section: Co 2 Activationmentioning

confidence: 99%

Biomass-based carbon materials for CO2 capture: A review

Quan

Zhou

Wang

et al. 2023

Journal of CO2 Utilization

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Isotherm and thermodynamic modelling of malachite green on CO2-activated carbon fibers

Cited by 14 publications

References 22 publications

Microwave-Assisted Fabrication of Fugus-Based Biocarbons for Malachite Green and NO2 Removal

Microwave-Assisted Fabrication of Fugus-Based Biocarbons for Malachite Green and NO2 Removal

Adsorption Phenomenon of VOCs Released from the Fiber-Reinforced Plastic Production onto Carbonaceous Surface

Biomass-based carbon materials for CO2 capture: A review

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