Abstract
The adsorption and desorption performances of CI Acid Red 18 and CI Acid Red 88 on an anion exchange membrane were studied. The effects of temperature, time, pH value and inorganic salt on the adsorption were investigated. The results showed that temperature and pH value had nearly no influence on the dye adsorption. The addition of inorganic salt (sodium sulphate) in the dye solution had a definite influence on the adsorption. The adsorption of the two acid dyes was in accordance with the pseudo‐second order dynamics model. The Langmuir adsorption model could describe the adsorption processes well. The membrane was more effective on CI Acid Red 18, which has three sulphonic groups. In the desorption process, different solutions were applied to investigate the desorption performance of the two acid dyes. The desorption percentage could reach ca. 90% using a mixture of ethanol, sodium chloride and water as the desorption solution. The anion exchange membrane could be reused.
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