Behzad Hossieni; Somayeh Sohrabi; Faranak Akhlaghian
Abstract
Inexpensive and new adsorbents, which are produced by processing the abundant agricultural by-products, can provide an efficient solution for a cleaner environment. The occurrence of heavy metals in water may pose a significant threat to human health. In this work, the processed date kernels are used ...
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Inexpensive and new adsorbents, which are produced by processing the abundant agricultural by-products, can provide an efficient solution for a cleaner environment. The occurrence of heavy metals in water may pose a significant threat to human health. In this work, the processed date kernels are used to remove chromium (VI) and iron (III) from water. The XRD, FTIR, SEM, VSM and EDX techniques are used to characterize the adsorbents. The equilibrium adsorbent dose for iron is 2 g/L while for chromium (VI) it is 4 g/L and the equilibrium time is 20 min. Moreover, acidic conditions favored the adsorption for both targets. The adsorption experiments showed that the kinetics of adsorption of chromium (VI) and iron (III) on date kernel powder fitted the pseudo-second-order model. The optimum adsorption capacities for iron (III) and chromium (VI) are 10.5 mg/g and 0.66 mg/g, respectively. In the meantime, the remarkable efficiency of the date kernel-based adsorbent for iron (III) removal paves the way for designing new magnetic adsorbents.
Saeed Khanlari; Faranak Akhlaghian
Abstract
Herbicides such as 2, 4-dichlorophenoxyacetic acid (2, 4-D) are generally carcinogenic and their existence in water cause many problems. In this work, Fe3O4/FexCuyWzOt core/shell magnetic photocatalyst was used to remove 2, 4-D. The statistical analysis of the results of the Box-Behnken experimental ...
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Herbicides such as 2, 4-dichlorophenoxyacetic acid (2, 4-D) are generally carcinogenic and their existence in water cause many problems. In this work, Fe3O4/FexCuyWzOt core/shell magnetic photocatalyst was used to remove 2, 4-D. The statistical analysis of the results of the Box-Behnken experimental design method revealed that among the constituents of the photocatalyst shell, iron had the highest effect on 2, 4-D photodegradation. The photocatalyst composition was optimized using the response surface method. The photocatalyst formulation was determined using ICP method: Fe3O4/Fe0.874Cu0.349W0.004O1.525. XRD analysis confirmed the formation of Fe3O4, CuO, and WO3 in the photocatalyst shell. TEM images showed the photocatalyst core/shell structure. Fe3O4/Fe0.874Cu0.349W0.004O1.525 photodegraded 2, 4-D under ultraviolet light irradiation with the maximum yield of 90%. The photocatalyst was also active under sunlight and LED. The kinetics of the 2, 4-D photodegradation reaction under ultra violet light irradiation was studied. It followed first order kinetic model. The rate constant of the reaction was 0.0118 min-1. The photocatalyst activity of Fe3O4/Fe0.874Cu0.349W0.004O1.525 remained constant after the fourth cycle of reuse, which is the good advantage.
