Preparation And Fenton Catalytic Properties Of Carbon Fiber Cloth Supported Molybdenum Disulfide Hybrid Material

In recent decades,with the rapid development of industry,human destruction of the natural environment has far exceeded the extent to which it can be naturally repaired.Among them,the current situation of water resource destruction is particularly worrying,as water resources are the most important natural resource for human survival.Although there is a large amount of water on the surface of the earth,there are very few freshwater resources available for human production and life.In addition,most of the freshwater is stored in the poles and glaciers,and cannot be directly utilized by people.Therefore,the effective utilization and protection of limited freshwater resources is a very serious issue facing people.In the current cases of water pollution,the most common ones are heavy metal ions,antibiotics,and organic dyes pollution.A large amount of research has been conducted on this type of water pollution problem.Currently,research is still ongoing to find economic,safe,simple,and effective water treatment pathways.Since its discovery in 1894,Fenton catalysts have been extensively studied for the removal of organic pollutants in water due to their non selectivity and good treatment efficiency.However,the iron sludge produced by Fenton has brought about secondary pollution issues,and the development of heterogeneous Fenton catalysts is often accompanied by low treatment efficiency.Recently,molybdenum disulfide（MoS₂）has been reported as a co catalyst for the Fenton reaction process.The presence of MoS₂can significantly improve Fe³⁺/Fe²⁺cycling,thus effectively reducing the production of iron sludge.MoS₂,as a two-dimensional transition metal material,has good conductivity,adsorption,and photocatalytic activity,and is often used in photocatalytic processes;Carbon fiber,as an organic material with stable chemical properties,conductivity,and morphological stability,can serve as a high-performance carrier.This article synthesized two heterogeneous Fenton catalysts using carbon fiber sheet（CFS）and electrospun carbon nanofiber cloth（ECN）as support materials,MoS₂ as co catalyst,and methylene blue（MB）as model pollutant to investigate the water treatment effects of the two catalysts:1.Preparation and catalytic performance of heterogeneous Fenton catalysts supported on FeSe₂@MoS₂A simple two-step hydrothermal method was used to prepare catalytic materials loaded with FeSe₂ and MoS₂ on non-woven carbon fiber felt.Firstly,the catalytic materials were synthesized through a hydrothermal process at 160℃for 12 hours FeSe₂@CFS,followed by a hydrothermal reaction at 180℃for 12 hours to synthesize MoS₂@FeSe₂@CFS.The characterization results of the materials show that the loaded inorganic compound have uniform distribution and tight load.The performance test results show that the material has a nearly 100%removal rate of methylene blue within20 minutes by activating H₂O₂,and has good reusability and stability.It can be reused more than 5 times.The X-ray photoelectron spectroscopy（XPS）and Fe,Moion dissolution results of the material before and after the reaction indicate that the material is stable.Compared with similar catalytic materials that have been reported,it has satisfactory performance.The hydroxyl radical（·OH）and singlet oxygen（¹O₂）were identified as the main active species by electron paramagnetic resonance（EPR）and radical trapping experiments.The design of a catalytic reactor and experiments on the degradation of methylene blue in flowing water have been carried out,proving that the material has good application potential.2.Monatomic Cu@MoS₂ Heterogeneous Fenton catalysis loaded on electrospun carbon nanofibersThe electrospun carbon nanofiber cloth was surface hydrophilic modified with polydopamine and placed in a hydrothermal kettle.MoS₂ was loaded using the same method as in the first work to obtain MoS₂@ECN.By utilizing the adsorption properties of hydrothermal MoS₂ on metal ions,the prepared material was placed in a 100 mg/L Cu²⁺solution to saturate its adsorption.During this process,MoS₂ may directly react with metal ions to form Cu²⁺/MoS₂ redox pairs.After further treatment,the thiourea was placed in a 10 g/L thiourea solution and evaporated to dry the solvent to achieve uniform deposition of the thiourea.Subsequently,the Cu²⁺was fixed and reduced to Cu⁺by calcination in a tube furnace under N₂ atmosphere.The single atom loading was characterized using high angle annular dark field scanning transmission electron microscopy（HAADF-STEM）,X-ray diffraction（XRD）,and XPS.The catalytic performance test shows that the material can achieve nearly complete removal of low concentration pollutants within 30 minutes,and can still maintain a high removal rate after repeated use for 4 times.Finally,the removal of pollutants by the reactor in a liquid flow state was carried out,demonstrating the excellent catalytic performance of the material and its potential for practical application.