Determination of parameters and kinetic evaluation for chromium (VI) removal using four resins

Ramírez-Revilla S.A.; Camacho-Valencia D.; Ortiz-Romero D. · Ecletica Quimica (2024) · DOI: 10.26850/1678-4618.eq.v49.2024.e1402

Resumen

This research aimed to identify optimal studied variables for chromium (VI) removal using four resins (IRA 96, IRA 400, DOWEX 1x8, and LEWATIT). A 1,5-diphenylcarbazide method was used for the quantification of chromium (VI). A factorial design with triple replication at the center point was used to evaluate pH, resin dose (g/100 mL), and initial chromium (VI) concentration. The optimal values for the four resins were a pH of 3, a resin concentration of 0.15 g/100 mL of solution, and an initial concentration of 10 mg/L of chromium. Then, an ANOVA study was done to compare the resins results using a p-value <0.05. The DOWEX resin presented the highest removal percentage (98.39%) for a reaction period of 45 minutes, with an exponential model that fits a pseudo-first-order kinetics with a coefficient of determination equal to 0.967.

Instituciones: Universidad Tecnológica del Perú