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In the present study, pummelo peel pretreated with sodium hydroxide i su sed foradsorption of methylene blue (MB). In order to investigate the ef- fects of pretreatment on the cationic dye adsorp- tion ,t he kinetics and capacities of raw pummelo peel (RPP) an ds odium hydroxide treated pummelo peel (TPP) to remove MB from aqueous solutions were compared. The effects of various experimental pa- rameters (e.g., initial pH, dye concentration, contact time) were also studied. Accordin gt o themaximum adsorption capacity (qm )o btained, adsorption capa- bility of pummelo peel is significantly increased af- ter sodium hydroxide treatment. Both adsorption isotherms of RPP and sodium hydroxide TPP fitted the Langmuir model well, but not the Freundlich model. The processes of uptake followed pseudo-first order rate kinetics. The results in this study indicated that sodium hydroxide TPP is a promising adsorbent for removing MB fro ma queous solution.

Enhanced Removal of Methylene Blue from Aqueous Solution by Pummelo Peel Pretreated with Sodium Hydroxide