Study On The Preparation Of Heterogeneous Iron/cobalt-based Fenton Catalyst And Its Degradation Of Cyclin Wastewater

How to degrade organic pollutants in water has always been the focus of attention,but traditional separation and conversion technologies are inefficient in treating pollutants with high stability.In recent decades,advanced oxidation processes（AOPs）have shown potential in removing organic pollutants with higher stability due to their high active oxygen species,which has attracted more and more attention.Fenton and Fenton-like systems have been popular for many years.Compared with traditional H₂O₂,Fenton-like reactions involving peroxymonosulfate（PMS）or persulfate（PS）can oxidize target pollutants more thoroughly,and adaptation occurs effectively in aqueous systems with a wider p H range.As relatively stable solids,they can also be easily stored and transported on a large scale and used in precise dosages,far superior to liquid H₂O₂.1.In this work,a simple catalyst synthesis strategy is proposed.Fe SnO（OH）5 with regular cubic morphology was synthesized by co-precipitation method,and after high-temperature calcination as a precursor,not only can the composite product Fe₂O₃/SnO₂ be obtained,but the composite material also retains the cube morphology of the precursor to a certain extent.When Fe₂O₃/SnO₂ was used as a heterogeneous Fenton-like catalyst to activate PMS,the degradation of 20 ppm tetracycline（TC）showed better catalytic efficiency than single-phase Fe₂O₃.Moreover,Fe₂O₃/SnO₂ can maintain its catalytic efficiency in repeated batch experiments.The characterization results show that Fe₂O₃/SnO₂ has a catalytic mechanism similar to that of conventional Fe₂O₃,and the relatively stable microstructure and preferred crystal phase are the main reasons for this significant enhancement.In addition,influencing factors such as PMS concentration,catalyst dosage,p H value and the kind of anions contained in the solution have been studied and analyzed in detail.2.The CoSn（OH）6 cube synthesized by the co-precipitation method was calcined at high temperature.By changing the gas used under the calcining conditions and the calcining temperature,three composites of Co-Sn-O,Co₃O₄/SnO₂,and Co₂ SnO₄/SnO₂ were prepared.product.All three are used as catalysts for activating PMS to degrade 50 ppm tetracycline（TC）.The results show that Co₂ SnO₄/SnO₂ has better catalytic performance than Co-Sn-O and Co₃O₄/SnO₂.This is due to the synergistic effect of Co₂+ and Sn4+ in Co2.SnO₄,and the formation of stable microstructures between Co₂ SnO₄ and SnO₂.At the same time,Co₂ SnO₄/SnO₂ also showed remarkable stability and reusability.Even after the fourth cycle operation,the degradation rate of TC remained above 90%.On the basis of characterization and analysis,the possible mechanism and pathway of Co₂ SnO₄/SnO₂ activation of PMS to degrade TC were further proposed.