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2005•Acta Mineralogica SinicaRequires access

THERMODYNAMIC STUDY OF SORPTION OF CATIONIC PINK FG DYESTUFF ON PURIFIED PALYGORSKITE FROM WATER

Qing Chen-song

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Abstract

The adsorption thermodynamic and mechanism of purified palygorskite for cationic pink dyestuff from aqueous solution were investigated. Equilibrium data for the adsorption of cationic pink dyestuff from aqueous solution within the temperature rang of 298-328 K and investigative concentration rangewere obtained and correlatedwith a Langmuir-type isotherm equation. The results indicatedthat the process of sorption of cationic pink dyestuff from aqueous solutiononpurified palygorskite is an endothermic process. the adsorption parameters of thermodynamic were calculated according to the relationship of thermodynamic function: enthalpy is 0.49kJ/mol , adsorption free energy is in the range of -27.48——30.29 kJ/moland the adsorption occurringbecause of the decrease of Gibbs free energy and adsorption entropy is 93.85 kJ/molK. The adsorption behaviors are reasonablyinterpreted.

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What this paper is about

The adsorption thermodynamic and mechanism of purified palygorskite for cationic pink dyestuff from aqueous solution were investigated. Equilibrium data for the adsorption of cationic pink dyestuff from aqueous solution within the temperature rang of 298-328 K and investigative concentration rangewere obtained and correlatedwith a Langmuir-type isotherm equation. The results indicatedthat the process of sorption of cationic pink dyestuff from aqueous solutiononpurified palygorskite is an endothermic process. the adsorption parameters of thermodynamic were calculated according to the relationship of thermodynamic function: enthalpy is 0.49kJ/mol , adsorption free energy is in the range of -27.48——30.29 kJ/moland the adsorption occurringbecause of the decrease of Gibbs free energy and adsorption entropy is 93.85 kJ/molK. The adsorption behaviors are reasonablyinterpreted.

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Available abstract

The adsorption thermodynamic and mechanism of purified palygorskite for cationic pink dyestuff from aqueous solution were investigated. Equilibrium data for the adsorption of cationic pink dyestuff from aqueous solution within the temperature rang of 298-328 K and investigative concentration rangewere obtained and correlatedwith a Langmuir-type isotherm equation. The results indicatedthat the process of sorption of cationic pink dyestuff from aqueous solutiononpurified palygorskite is an endothermic process. the adsorption parameters of thermodynamic were calculated according to the relationship of thermodynamic function: enthalpy is 0.49kJ/mol , adsorption free energy is in the range of -27.48——30.29 kJ/moland the adsorption occurringbecause of the decrease of Gibbs free energy and adsorption entropy is 93.85 kJ/molK. The adsorption behaviors are reasonablyinterpreted.

Key concepts: Palygorskite, Adsorption, Enthalpy, Gibbs free energy, Aqueous solution, Chemistry, Sorption, Endothermic process

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THERMODYNAMIC STUDY OF SORPTION OF CATIONIC PINK FG DYESTUFF ON PURIFIED PALYGORSKITE FROM WATER — Research Paper | ScholarLens