钛网表面Fe₃O₄/FeS₂膜层制备及其类芬顿降解苯酚研究

To widen the working pH range of Fenton-like catalyst, improve the degradation performance of organic pollutant and meanwhile tackle its recycling difficulty, Fe₃O₄/FeS₂ immobilized coating on Ti mesh was synthesized by electrodeposition technique, which is simple and easy for large-scale synthesis. Phase composition, morphology and surface elemental valence of the as-prepared catalysts were characterized by XRD, SEM and XPS analysis. The results showed that phase composition of the sample was mainly comprised of Fe₃O₄ and FeS₂. The microstructure was the porous structure formed by nanosheet interconnection. Fenton-like degradation of phenol by as-prepared catalysts revealed that Fe₃O₄/FeS₂ on Ti mesh with 0.20 mol/L sulfur source can degrade 98% 35 mg/L phenol with 6 mmol/L H₂O₂ at 30 ℃ within 60 min, thus exhibiting excellent Fention-like degradation of phenol performance. Further studies revealed that Fe₃O₄/FeS₂ with larger specific surface area can enhance mass transfer and meanwhile provide plentiful active sites for phenol degradation. In addition, the sulfur species on sample surface can promote the redox cycle of Fe³⁺/Fe²⁺. Moreover, the sulfate species can supply a suitable acidic environment for Fenton-like reaction, contributing to the increase of hydroxyl radical production rate and output. Finally, the catalytic activity of Fe₃O₄/FeS₂ under near-neutral pH can be improved.