Optimization of the Fe۳O۴/FexCuyWzOt photocatalyst for ۲,۴ dichlorophenoxyacetic acid wastewater degradation using the response surface method

Herbicides such as ۲, ۴-dichlorophenoxyacetic acid (۲, ۴-D) are generally carcinogenic and their existence in water cause many problems. In this work, Fe۳O۴/FexCuyWzOt core/shell magnetic photocatalyst was used to remove ۲, ۴-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 ۲, ۴-D photodegradation. The photocatalyst composition was optimized using the response surface method. The photocatalyst formulation was determined using ICP method: Fe۳O۴/Fe۰.۸۷۴Cu۰.۳۴۹W۰.۰۰۴O۱.۵۲۵. XRD analysis confirmed the formation of Fe۳O۴, CuO, and WO۳ in the photocatalyst shell. TEM images showed the photocatalyst core/shell structure. Fe۳O۴/Fe۰.۸۷۴Cu۰.۳۴۹W۰.۰۰۴O۱.۵۲۵ photodegraded ۲, ۴-D under ultraviolet light irradiation with the maximum yield of ۹۰%. The photocatalyst was also active under sunlight and LED. The kinetics of the ۲, ۴-D photodegradation reaction under ultra violet light irradiation was studied. It followed first order kinetic model. The rate constant of the reaction was ۰.۰۱۱۸ min-۱. The photocatalyst activity of Fe۳O۴/Fe۰.۸۷۴Cu۰.۳۴۹W۰.۰۰۴O۱.۵۲۵ remained constant after the fourth cycle of reuse, which is the good advantage.

کلیدواژه ها:

Core/shell ، ۲ ، ۴-D wastewater ، Magnetite ، WO۳