Adsorption Performance of CTAB-Modified Longan Peel: A Sustainable Biosorbent for Rhodamine B and Methylene Blue Removal from Aqueous Systems

This study examines the adsorption potential of longan (Dimocarpus longan) peel modified with cetyltrimethylammonium bromide (CTAB) for the removal of rhodamine B and methylene blue dyes from aqueous solution. Modification process aims to enhance the adsorption capacity of longan peel toward cationic dyes. Batch adsorption experiments were conducted to examine adsorption capacity under varying conditions and the data were analyzed using isotherm and kinetics models. The results showed that the CTAB-modified longan peel effectively adsorbed both dyes, with optimal conditions for each. Adsorption isotherms followed the Freundlich model, indicating heterogeneous surfaces, while kinetic analysis revealed that the pseudo-second-order model provided the best fit. Comparative evaluation with silica gel confirmed the superior performance of the modified longan peel, particularly in rhodamine B removal. These findings highlight the potential of CTAB-modified longan peel as a low-cost, efficient adsorbent for dye-contaminated wastewater. The study advances biowaste valorization strategies and supports the development of sustainable wastewater treatment technologies.

کلیدواژه ها:

Adsorption ، Isotherm ، Kinetic ، Modification ، Pollutant