Preparation of ferric hydroxide chelated glass fiber modified with dopamine chemistry for effective degradation of organic dyes by heterogeneous Fenton method

Abstract

The effectiveness, recyclability, and easy-to-use operation of the heterogeneous Fenton catalyst are of great importance in treating dye wastewater. Herein, we prepared a fiber-loaded heterogeneous Fenton catalyst with glass fiber as the carrier, and investigated the effectiveness and recyclability in degrading organic dye wastewater. It shows that the degradation process of methylene blue (MB), Congo red (CR), and crystal violet (CV) in the catalyst and H₂O₂ system conforms to a pseudo-first-order (PFO) kinetic equation, with the maximum degradation rates of 91.95%, 94.17%, and 96.03% within 100 min at 40 °C, respectively. The catalyst exhibits excellent recyclability, maintaining a degradation rate above 80% after 6 cycles for CR and 7 cycles for MB and CV. All results demonstrate that the catalyst is an excellent heterogeneous Fenton catalyst with high dye degradation efficiency, good recyclability, mild reaction condition, and easy-to-use operation, which holds promising great potential for application in dye wastewater treatment.