Stabilization of potassium-doped activated carbon by amination for improved CO2 selective capture

Adelodun, Adedeji A.; Lim, Yun Hui; Jo, Young Min

doi:10.1016/j.jaap.2014.05.005

Cited by 27 publications

(14 citation statements)

References 44 publications

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“…This is clearly shown by the pure CO 2 adsorption plot of the representative samples compared in Fig. 8 (Adelodun et al, 2014b). As depicted, the adsorption profiles indicate that samples with no potassium species tethered on their surfaces barely adsorbed any CO 2 molecules in the early period of the adsorption process (0-0.0005 P/Po), whereas those with higher surface energy exhibited immense adsorption at this early stage.…”

Section: Adsorption Kinetics Studymentioning

confidence: 73%

“…It is necessary to emphasize that our previous works have identified that dry phase pre-treatment of AC such as ozonation (Adelodun et al, 2014a) and wet phase such as KOH (aq) doping (Adelodun and Jo, 2013;Adelodun et al, 2014b) were most suitable for G1 and G2 respectively. This discrepancy was conclusively attributed to the difference in their degree of ultra-microporosity, as the former exhibits superiority over the latter.…”

Section: Resultsmentioning

confidence: 99%

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Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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Detailed assessments of adsorption properties (isotherm, thermodynamics and kinetics) were carried out on chemically modified activated carbon (AC). Some pretreatment methods prior amination have been used to improve the CO 2 selective capture of AC in our previous works. Here, the inter-relationships among the adsorption properties were further investigated and reported. It was found that CO 2 molecules bind onto the heterogeneous surfaces of AC in a monolayer pattern as experimental data fit Freundlich isotherm rather than Langmuir. However, Redlich-Peterson, a 3-parameter model provided the best fit. The highest degree of precision of Chi-square analysis professed it as the most efficient error function for the isotherm study. Values of standard entropy showed to be the most significant thermodynamic limiting parameter in the adsorption process, as physisorption was found predominant for CO 2 collection at the interface. This observation was corroborated with temperature programmed desorption (TPD) analysis where ca. 86% of adsorbed CO 2 were desorbed below 500°C. The kinetic study indicated that CO 2 -AC interaction follows pseudo-second order while the higher R 2 of intraparticle diffusion over Elovich equation confirmed the deduction made from the thermodynamic study. Conclusively, the study of adsorption properties in this work provides useful information for designing proper adsorption reactor and subsequent regeneration of CO 2 -laden adsorbents at environmental levels.

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Section: Adsorption Kinetics Studymentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

Self Cite

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“…Besides oxygenated functional groups, basic amino groups on the surface of biochar have also been shown to greatly improve its performance in applications such as CO2 capture and pollutant adsorption [38]. Surface amination is one of the most widely used methods to introduce amino groups into biochar.…”

Section: Tuning Of Surface Propertiesmentioning

confidence: 99%

Characterization, Modification and Application of Biochar for Energy Storage and Catalysis: A Review

Xiu

Shahbazi²,

Li³

2017

Tr Ren Energy

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Biomass can be converted to biofuels and bioproducts via thermochemical processes. Biochar is one of the major products of thermochemical conversion of biomass. The efficient use of biochar is critical to improving the economic viability and environmental sustainability of biomass conversion technologies. Applications of biochar for both agricultural and environmental benefits (e.g. as soil amendment, for inorganic pollutant removal) have been studied and reviewed extensively. However, biochar for energy storage materials and catalytic applications has not been widely reviewed in the recent past. This review aims to present the more significant recent advances in several biochar utilizations such as catalysts and supercapacitors. Discussions on biochar production technologies, chemistry, properties, characteristics, and advanced functionalization techniques are provided. It also points out barriers to achieving improvements in the future.

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“…For example, Please do not adjust margins Please do not adjust margins the OH and COOH groups may significantly improve the adsorption capacity when the lignin derived char is used as an adsorbent for heavy metal removal, since they can greatly improve the hydrophilicity of the materials, 101 and interact with the metals via hydrogen bonding or complexation. 102,103 The NH 2 can endow the char with alkalinity, which may greatly improve its performance in CO 2 capture and acidic pollutants removal, [104][105][106] while the introduction of SO 3 H to the lignin derived char can make it become a solid acid material, which can be used as alternatives to the liquid acids to catalyze many chemical reactions. 107 Surface oxidation, amination, and sulfonation are the main approaches for the introduction of these functional groups on the surface of the lignin derived char.…”

Section: Surface Modificationsmentioning

confidence: 99%

Thermochemical conversion of lignin to functional materials: a review and future directions

2015

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Lignin valorization is considered as an important part of the modern biorefinery scheme. The unique structure and composition of lignin may offer many effective routes to produce several bulk chemicals and functional materials. Thermochemical conversion of the lignin to synthesize the value-added functional materials has recently attracted lots of attention. In this review, we have presented currently available approaches and strategies for the thermochemical conversion of the lignin to functional carbon materials. The transformation behavior and mechanism of lignin during the thermochemical process (e.g., pyrolysis and hydrothermal carbonization) are illuminated. The characteristics (structure and surface chemistry) of the lignin-based functional carbon materials are summarized systematically. The advances on the functionalization of lignin-based carbon materials (surface functionality tuning and porosity tailoring) and applications of the lignin-based functional carbon materials in the fields of catalysis, energy storage, and pollutant removal are reviewed. Perspectives on how lignin-based functional materials would develop and especially in which fields the use of these functionalized materials could be expanded are discussed. This review clearly shows that rational designing of the functionalized lignin-based materials will lead to a rich family of hybrid functional carbon materials with various applications toward a green and sustainable future. many persistent organic pollutants (e.g., polycyclic aromatic hydrocarbons (PAHs), oxygenated PAHs (OPAHs), and dioxins) [24][25][26] and particulate matters (e.g., PM 2.5 and PM 10) 27, 28 may form if

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Stabilization of potassium-doped activated carbon by amination for improved CO2 selective capture

Cited by 27 publications

References 44 publications

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Characterization, Modification and Application of Biochar for Energy Storage and Catalysis: A Review

Thermochemical conversion of lignin to functional materials: a review and future directions

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