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Citation: LONG Chao, ZHANG Quan-Xing, CHEN Jin-Long. Adsorption of Highly Water-soluble Aromatic Sulfonic Acids onto Macroporous Weakly Basic Anion Exchanger[J]. Chinese Journal of Applied Chemistry, ;2004, 21(10): 997-1001. shu

Adsorption of Highly Water-soluble Aromatic Sulfonic Acids onto Macroporous Weakly Basic Anion Exchanger

1.
State Key Laboratory of Pollution Controland Resources Reuse, Department of Enviro nmental Engineering, Nanjing University, Nanjing 210093

Corresponding author: LONG Chao,
Received Date: 29 September 2003
Available Online: 20 December 2003
Fund Project: 江苏省高新技术资助项目(BG2003030) (BG2003030)

The adsorption behavior of 2-naphthalenesulfonic acid(2-NSA), p-tuluenesulfonic acid(p TSA), p-chlorobenesulfonic acid(p-CBSA), and 4,4'-dinitrostilibene 2,2'-disulfonic acid(DNS) onto a macroporous weakly basic anion-exchanger(D301) have been investigated. The results indicated that it is a favorable and spontaneous adsorption process, and the adsorption isotherm data can be satisfactorily fitted with the Redlich Peterson equation. The adsorption of strong aromatic sulfonic acids on D301 is due to electrostatic interaction, whereas the adsorption of weak aromatic sulfonic acids DNS on D301 is a result of Van der Waals forces. Positive △H and △S values show that the process of adsorption of 2-naphthalenesulfonic acid, p-tuluenesul fonic acid, p-chlorobenesulfonic acid on D301 is endothermic and entropy driven. The negative △H and △S values for DNS acid indicate that the adsorption is exothermic and enthalpy driven.
- macroporous weakly basic anion-exchanger,
- aromatic sulfonic acid,
- dye intermediate,
- adsorption thermodynamics
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