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Modelling and thermodynamic properties of pure CO_(2)and fue gas sorption data on South African coals using Langmuir,Freundlich,Temkin,and extended Langmuir isotherm models

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International Journal of Coal Science & Technology 2022年第3期9卷 136-150页

作者： Major Mabuza Kasturie Premlall Michael O.Daramola Department of Chemical Engineering Faculty of Engineering and TechnologyVaal University of TechnologyP.O.Box 3595Secunda 2302South Africa Department of Chemical Metallurgical and Materials EngineeringFaculty of Engineering and the Built EnvironmentTshwane University of TechnologyPrivate Bag X680Pretoria 0001South Africa Department of Chemical Engineering Faculty of EngineeringBuilt Environment and Information TechnologyUniversity of PretoriaHatfeldPretoria 0028South Africa

Carbon sequestration in unmineable coal seams has been proposed as one of the most attractive technologies to mitigate carbon dioxide(CO_(2))emissions in which CO_(2)is stored in the microporous structure of the coal matrix in an adsorbed *** CO_(2)adsorption process is hence considered one of the more efective methodologies in environmental ***,adsorption isotherm measurements and modelling are key important scientifc measures required in understanding the adsorption system,mechanism,and process optimization in *** this paper,three renowned and reliable adsorption isotherm models were employed including Langmuir,Freundlich,and Temkin for pure CO_(2)adsorption data,and the extended-Langmuir model for multicomponent,such as fue gas mixture-adsorption data as investigated in this research ***,signifcant thermodynamics properties including the standard enthalpy change(ΔH°),entropy change(ΔS°),and Gibbs free energy(ΔG°)were assessed using the van’t Hof *** statistical evaluation of the goodness-of-ft was done using three(3)statistical data analysis methods including correlation coefcient(R^(2)),standard deviation(σ),and standard error(SE).The Langmuir isotherm model accurately represent the pure CO_(2)adsorption on the coals than Freundlich and *** extended Langmuir gives best experimental data ft for the fue *** thermodynamic evaluations revealed that CO_(2)adsorption on the South African coals is feasible,spontaneous,and exothermic;and the adsorption mechanism is a combined physical and chemical interaction between the adsorbate and the adsorbent.

关键词： Global warming Flue gas adsorption Unmineable coal adsorption models

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CO2-hierarchical activated carbon prepared from coal gasification residue: adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1694-1700页

作者： Yuhong Kang Xianyong Wei Guanghui Liu Miao Mu Xiangrong Ma Yong Gao Zhimin Zong Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhouJiangsu 221116China Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization School of Chemistry and Chemical EngineeringYulin UniversityYulinShaanxi 71900China

Mineral matter in a residue(RC G)from coal gasification(CG)was removed by two-stage acid *** activated carbon(HAC)was prepared by activating RC Gwith *** performance of HAC on removing methylene blue(MB)from an aqueous solution was *** was characterized by N2 adsorption–desorption isotherm,Fourier transform infrared spectroscopy,and scanning electron *** results show that HAC exhibits hierarchical pore structure with high specific surface area(862.76 m2·g-1)and total pore volume(0.684 cm3·g-1),and abundant organic functional *** adsorption equilibrium data of MB on HAC are best fitted to the *** kinetic data show that the pseudo-first-order model is more suitable at low MB concentration,while the advantages of the pseudo-second-orderand the Elovich models are more obvious as the concentration *** to the thermodynamic parameters,the HAC-MB adsorption process is spontaneous and endothermic.

关键词： Residue from coal gasification Hierarchical activated carbon Physical activation adsorption models

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