2021
DOI: 10.1002/cjce.23940
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Thermodynamics of CO2 adsorption on cellulose‐derived biochar prepared in ionic liquid

Abstract: This work focused on thermodynamic analysis of carbon dioxide (CO2) adsorption on a promising biochar as a CO2 adsorbent. The biochar was prepared by catalytic pyrolysis of cellulose material in ionic liquid at moderate temperature. The adsorption characteristics, such as adsorption capacity, interfacial potential, Gibbs free energy change, enthalpy change, entropy change, and internal energy change, influenced by adsorption temperature and gas pressure, were systematically investigated. The results indicated … Show more

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Cited by 10 publications
(3 citation statements)
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“…The interface potential ϕ was defined as a kind of chemical potential difference μ s − μ s0 based on the fundamental differential equations, [ 49,50 ] just like that described in the previous literature. [ 47,51 ] φgoodbreak=μsgoodbreak−μs0goodbreak=μs,0μsd()μsgoodbreak−μs0goodbreak=goodbreak−0nnamsdμagoodbreak=goodbreak−pΘ,0p,qitalicqdμggoodbreak=goodbreak−RT0,pΘq,fitalicqdlnfg limp0μs0μsdμs=0 limp0φ=limp0μnormalsμs0=0 The absolute value of interface potential reflected the interaction strength between CO 2 molecules and the biochar, which was beneficial to understand the site energy distribution. Combined with Equation () and the slip model, Equation () was obtained to calculate the differentials of interface potential via adsorption temperature and pressure, which represented the related temperature effect and pressure effect, respectively.…”
Section: Resultsmentioning
confidence: 99%
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“…The interface potential ϕ was defined as a kind of chemical potential difference μ s − μ s0 based on the fundamental differential equations, [ 49,50 ] just like that described in the previous literature. [ 47,51 ] φgoodbreak=μsgoodbreak−μs0goodbreak=μs,0μsd()μsgoodbreak−μs0goodbreak=goodbreak−0nnamsdμagoodbreak=goodbreak−pΘ,0p,qitalicqdμggoodbreak=goodbreak−RT0,pΘq,fitalicqdlnfg limp0μs0μsdμs=0 limp0φ=limp0μnormalsμs0=0 The absolute value of interface potential reflected the interaction strength between CO 2 molecules and the biochar, which was beneficial to understand the site energy distribution. Combined with Equation () and the slip model, Equation () was obtained to calculate the differentials of interface potential via adsorption temperature and pressure, which represented the related temperature effect and pressure effect, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The adsorption thermodynamics of CO 2 on the nitrogen‐doped biochar was investigated based on the isotherms at 273, 298, 323, and 348 K. The related analysis methods have been introduced in our previous paper. [ 47 ] Differently, instead of the D‐R equation (see Table 2), the slip model was used to extend the isotherms at more temperatures except at 273, 298, 323, and 348 K. Then, different thermodynamic systems were divided to analyze the mass and energy transfer processes based on the fundamental thermodynamic equations. Those thermodynamic parameters such as Gibbs free energy change were derived under the conditions of constant temperature and isopiestic pressure and obtained by the means of the Gibbs–Helmholtz equation.…”
Section: Methodsmentioning
confidence: 99%
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