Chitosan-modified palygorskite: Preparation, characterization and reactive dye removal

Chitosan-modified palygorskite (CTS-modified PA) was prepared by surface grafting of PA with chitosan, and the CTS-modified PA was used as an effective adsorbent for the removal of reactive dye. The effects of various experimental parameters such as initial pH, adsorbent dosage, contact time and initial dye concentration on adsorption were investigated. The adsorption behavior of CTS-modified PA showed that the adsorption kinetics and isotherms were in good agreement with the pseudo-second-order equation and the Langmuir equation, and the maximum adsorption capacity of CTS-modified PA calculated by the Langmuir model was 71.38 mg g− 1, which was much higher than that of the unmodified PA (6.3 mg g− 1).

Chitosan-modified palygorskite (CTS-modified PA) was prepared by surface grafting technique and the adsorption data showed that the adsorption capacity of CTS-modified PA to reactive yellow 3RS was much higher than that of the unmodified palygorskite.Figure optionsDownload as PowerPoint slideHighlights
► Chitosan-modified palygorskite (CTS-modified PA) was prepared by surface grafting.
► The adsorption capacity of CTS-modified PA was much higher than that of PA.
► Adsorption was dependent on pH, contact time, and the initial dye concentration.
► CTS-modified PA might be a promising adsorbent for anion dyes adsorption.