RT Journal T1 EVALUATING ADSORPTION KINETICS OF ENDOSULFAN ON NATURAL AND SYNTHETIC ADSORBENTS: A COMPARATIVE STUDY A1 Muhammad Aamer Hussain A1 Ghulam Murtaza A1 Muhammad Zia-ur-Rehman A1 Muhammad Shahid A1 Sofia Calero JF Journal of Animal and Plant Sciences JO JAPS SN 1018-7081 VO 35 IS 2 SP 429 OP 444 YR 2025 FD 2025/04/28 DO DOI https://doi.org/10.36899/JAPS.2025.2.0036 AB

The present study investigates the adsorption of endosulfan from aqueous solutions using various low-cost adsorbents. Adsorption kinetic data were analyzed using different models to determine the most effective adsorbents. In this study, different adsorbents, including sawdust, sugarcane bagasse, corn cob, sawdust biochar, sugarcane bagasse biochar, corn cob biochar, zeolite, montmorillonite, kaolinite, and magnetite, were applied at a rate of 0.02 g L-1. Endosulfan was spiked at concentrations of 0.01, 0.05, 0.1, 0.5, and 1 mg L-1. For kinetic studies, samples were collected at different time intervals (1, 3, 5, 8, 16, and 24 hours). The results revealed that natural zeolites exhibited the highest removal efficiency among all tested materials, with maximum adsorption capacity between 8 and 16 hours. Due to their large surface area, interlayer ions, and surface charge, clay minerals demonstrated a superior adsorption capacity compared to other adsorbents. Among the kinetic models, the pseudo-second-order model best described the adsorption behavior of most adsorbents, except for montmorillonite. Based on the intra-particle diffusion model, Kid values for sawdust, corncob biochar, and montmorillonite were 0.3093, 0.3075, and 0.3067 (mg g-1 s-0.5), respectively. For montmorillonite, the Qe Exp was 1.89 mg g-1, while Qe max predicted by pseudo-first-order and second-order models were 1.93 and 2.02 mg g-1, respectively. The pseudo-first-order model showed a better fit (R2 = 0.977, and R2 = 0.99) confirming the correlation. It is concluded that natural zeolites are the most effective adsorbent for endosulfan removal, with the pseudo-second-order model best describing adsorption kinetics for most materials.

K1 Endosulfan; Low-cost adsorbents; Clay minerals; Zeolites; Montmorillonite; Biochar; Chemisorption PB Pakistan Agricultural Scientists Forum LK https://thejaps.org.pk/AbstractView.aspx?mid=2024-JAPS-2475