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Kinetics of adsorption of disperse dyes by polyepicholorohydrin-dimethylamine cationic polymer/bentonite

机译：聚表氯醇-二甲胺阳离子聚合物/膨润土吸附分散染料的动力学

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摘要

The characterization of polyepicholorohydrin-dimethylamine/bentonite and the kinetics of adsorption of four 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(DY SE-6GFL)onto organophilic bentonite(polyepicholorohydrin-dimethylamine/bentonite)have been studied at various solution concentrations and temperatures.The adsorption kinetics was studied in terms of a two-step first-order kinetic rate equation and intra-particle diffusion model.The adsorption process has been found to follow with two different rate constants(k1 and k2)for two-step first-order kinetic rate equation and also two different intra-particle diffusion rate constants(k_(int1)and k_(int2))for intra-particle diffusion model.For both the kinetic steps,the energies of activation of adsorption(E_(a1)and E_(a2))and other thermodynamic parameters(DELTA H1 and DELTA H2,DELTA S1 and DELTA S1,DELTA G2 and DELTA G2)have been calculated using Arrhenius's and Eyring's equation,respectively.It has been found that for both the adsorption kinetic steps,E_(a1)and E_(a2).are corresponding to the values of k1 and k2 and DELTA 1H<-T_(av)DELTA S1,DELTA H2 -T_(av)DELTA S2 and DELTA G>0,which means that the influence of entropy is more remarkable than enthalpy in activation reaction and the adsorption process is not spontaneous.
机译：分散表氯醇二甲胺/膨润土的表征及分散黄棕S-2RFL（DYB S-2RFL），分散红SR（DR SR），分散蓝SBL（DB SBL）和分散体四种染料的吸附动力学研究了黄色（DY SE-6GFL）在不同溶液浓度和温度下在亲有机膨润土（聚表氯醇-二甲基胺/膨润土）上的吸附性能，并通过两步一级动力学速率方程和颗粒内扩散研究了吸附动力学。对于两步一阶动力学速率方程，已经发现吸附过程遵循两个不同的速率常数（k1和k2）以及两个不同的粒子内扩散速率常数（k_（int1）和k_（int2）在两个动力学步骤中，吸附的活化能（E_（a1）和E_（a2））以及其他热力学参数（DELTA H1和DELTA H2，DELTA S1和DELTA S1，DELTA G2）和DELTA G2）已使用Arrheni计算已经发现，对于吸附动力学步骤，E_（a1）和E_（a2）。都对应于k1和k2的值以及DELTA 1H <-T_（av）DELTA S1， ΔH2-T_（av）ΔS2，ΔG> 0，说明在活化反应中，熵的影响比焓更显着，吸附过程不是自发的。

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