Terrestrial environment

Adsorption behavior of Azo Dye C. I. Acid Red 14 in aqueous solutionon surface soils

QU Baocheng , ZHOU Jiti , XIANG Xuemin , ZHENG Chunli , ZHAO Hongxia , ZHOU Xiaobai


Received August 01, 2007,Revised September 24, 2007, Accepted , Available online

Volume 20,2008,Pages 704-709

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Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior of azo dyes in aqueous solution on DG06, GSE17200, and GSE17201 soils using C. I. Acid Red 14 (AR14) as example. The experimental results indicate that the Freundlich model expresses the adsorption isotherm better than the Langmuir model and the pseudo-second-order model achieves adsorption of AR14 on the three soils well. Based on the pseudosecond- order model, the adsorption thermodynamic of AR14 on DG06 soil have been studied and the thermodynamics parameter of G0 is determined and G0 value shows the adsorption process of AR14 on DG06 is mainly physical in nature. Furthermore, the e ects of temperature, pH and salinity (NaCl) on adsorption have been investigated. The decrease in pH or the increase in salinity enhances the adsorption of AR14 by DG06, GSE17200, and GSE17201.

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