Kinetics of Adsorption of Disperse Dyes at Cationic Bentonites

Abstract

Abstract: Kinetics of adsorption of each of disperse dyes, namely, Disperse Yellow Brown S-2RFL(DYB S-2RFL), Disperse Red S-R(DR S-R), Disperse Blue SBL(DB SBL) and Disperse Yellow SE-6GFL(DY SE-6GFL) onto cationic bentonites(EPI-DMA/Bt, PD/Bt, CTMAB/Bt) were studied. The results show that the adsorption processes follow a two-step first-order kinetic rate equation with two different rate constants(k₁, k₂), energies of activation(E_a1, E_a2), enthalpies of activation(ΔH^*₁, ΔH^*₂) and entropies of activation(ΔS^*₁, ΔS^*₂). With the increasing of the alkyl of cationic intercalary reagents, the kinetic rate constants also increase, which indicate that the large space between layers, more hydrophobic interlayer environment and more positive charges of cationic bentonites are important influence factors to accelerate adsorption. It has been found that for both the adsorption kinetic steps, ΔH^*₁＜-T_avΔS^*₁ ,ΔH^*₂＜-T_avΔS^*₂ and ΔG^*＞0, which means that the influence of the entropy is more remarkable than the enthalpy in the activation reaction.

Key words: Cationic bentonite, Disperse dye, Adsorption kinetic, Rate constant, Thermodynamic parameter

CLC Number:

O647

TrendMD:

LI Qian, YUE Qin-Yan*, GAO Bao-Yu, LIU Li-Li. Kinetics of Adsorption of Disperse Dyes at Cationic Bentonites[J]. Chem. J. Chinese Universities, doi: .

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Kinetics of Adsorption of Disperse Dyes at Cationic Bentonites

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