Abstract
Abstract In this work, a novel catalyst, metal-doped zinc ferrite nanosphere, was prepared from metal-rich industrial wastewater using two-step method for the removal of organic contaminants in the Vis-light/catalyst/H2O2 system. The physicochemical properties of the catalyst were well characterized by XRD, FESEM, TEM, XPS, and UV−vis. The results indicated that the catalyst exhibited better catalytic performance than pure ZnFe2O4 synthesized from chemical reagents, and Congo red (CR) decolorization efficiency reached 94.6% within 3 h. During the photo-Fenton process, •OH played an key role, which was generated through the photo-generated holes and the oxidation of H2O2 by metal ions (Fe3+ and Mn3+) on the surface of catalysts. Moreover, 75.5% of CR decolorization efficiency could be still retained at the third run. Thus, metal-doped ZnFe2O4 nanosphere prepared from metal-rich industrial wastewater is a promising photocatalyst for the removal of organic chemicals in practical application of wastewater treatment.
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