Adsorption Properties of Congo Red On Deacetylation of KGM

Abstract

Abstract:

The adsorption characteristics of congo red onto the deacetylation of konjac glucomannan (KGM) were investigated by static adsorption method. The results showed that the deacetylation of KGM was effective low cost adsorbent with high removal of dyes. The best percent color removal of congo red is about 92% or so. The adsorption kinetics can be well described by the pseudo-second order kinetics model. The adsorption isotherm of congo red can be well fitted the Freundlich equation. Thermodynamic functions calculated according to the relationship between adsorption enthalpy change (ΔH) for the 11.033kJ/mol, indicateed that the adsorption reaction is endothermic reaction, higher temperatures help adsorption. At different temperatures, Gibbs free energy change (ΔG) were less than 0, indicating that deacetylation of KGM congo red adsorption was spontaneous process.

Key words: deacetylation of konjac glucomannan, congo red, adsorption, kinetics, thermodynamics

CLC Number:

O647.31. 6.2

LV wen-ping, WANG chao, JIANG gui-lin, et al.. Adsorption Properties of Congo Red On Deacetylation of KGM[J]. NATURAL PRODUCT RESEARCH AND DEVELOPMENT, 2011, 23(3): 526-529.

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