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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.

The chemical composition of the volatile oil from aerial parts of Perovskia abrotanoides Karel. has been studied by GC and GC-MS. Twenty-nine components (98.9% of the total composition) were identified. 1,8-Cineole (32.4%), myrcene (13.0%), α α α α α-pinene (10.2%), camphor (9.1%), β β β β β-caryophyllene (7.9%), α α α α α-humulene (6.4%), camphene (5.0%) and α α α α α-bisabolol (2.6%) were found to be the major constituents of the oil. The oil of P. abrotanoides was characterized by a high content of monoterpenes (78.9%), whereas sesquiterpenes contained only 20.0% of the essential oil.

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In this research, the degradation of the insecticide diazinon was studied using a new hybrid catalyst consisting of magnesium oxide nanoparticles (nano-MgO), carbon nanotubes (CNTs), and graphite (Gr), nano-MgO@CNT@Gr, under various experimental conditions.