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A B S T R A C TThe impact of various operating parameters, including pH (2-12), concentrations of modified zeolite (0.1-1.25 g/L), initial concentration of Cr (VI) (0.1-1.5 mg/L), and contact time (5-120 min), was investigated on the removal of Cr (VI) from water through different experimental runs in the batch system. The results showed that modified zeolite had best performance for the removal of Cr (VI) at the pH 7. The time required for the removal of 90.95% of the Cr (VI) from a 1 mg/L solution was about 80 min using modified zeolite. The equilibrium assessment illustrated that the Langmuir model is the best fit for the experimental data, which attains a maximum adsorption capacity of 4.4 mg/g. Pseudo-second-order kinetic model was found to adequately describe the adsorption process. In the final part of the study, the efficacy of modified natural zeolite was examined to simultaneously removal of Cr (VI) and As (V) from aqueous solution. In summary, modified natural zeolite is an efficient in performance, simple to operate, and economical process and thereby affordable technology for the removal of Cr (VI) from the contaminated water source.

A B S T R A C TThe activated carbon prepared from Phoenix dactylifera fruit stones was tested for the removal of methylene blue (MB) dye from aqueous solutions. Batch studies were carried out to evaluate the impacts of initial solution pH (2-12), chemically activated carbon (CAC) concentration (0.25-5 g/L), MB concentration (50-400 mg/L), and contact time (20-430 min) on the adsorption of MB onto CAC. Results showed that the adsorption of MB was favorable at neutral pH. The results demonstrated that the Langmuir isotherm model best represented the equilibrium data with a maximum MB adsorption capacity of 478.32 mg/g. Pseudo-second-order kinetic model was found to adequately describe the adsorption process. The calculated thermodynamic parameters showed that adsorption process was spontaneous endothermic and physisorption was possible under examined conditions. In the final part of the study, the efficacy of CAC was examined by analyzing the removal of dye from industrial wastewater.