Preparation Of Porous Carbon Catalyst And Its Degradation Of Organic Pollutants In Water

With the development of economic and the acceleration of urbanization,large amounts of water sources have been polluted with hazardous organic pollutants and emerging contaminants of varying degrees with complicated molecular structures.Among them,the heterogeneous catalytic reaction overcomes the disadvantages of the narrow pH range of the homogeneous reaction in traditional advanced oxidation,the low utilization rate of oxides,and the secondary pollution.In view of the disadvantages of current heterogeneous catalysts,such as complex synthetic routes,high cost reagents,low catalytic efficiency and poor stability,it is essential to develop environmentally friendly and cost-effective stable catalysts for the degradation of pollutants.In this research,sodium alginate,a low cost,environmentally friendly biomacromolecule,was used as a raw material,and a hydrogel formed by cross-linking it with metal ions was used as a carbon source.Sodium alginate-based porous carbon catalyst was prepared by high temperature carbonization.The strong bond between C and iron in the porous carbon material produced by sodium alginate and iron ion precursors improves the electron transportation.The catalyst has a highly efficient catalytic activation capacity for both hydrogen peroxide and persulfate.The specific research and results are as follows:（1）Comparing the catalysts obtained by cross-linking sodium alginate gel template with Fe²⁺and Fe³⁺,it is found that Fe²⁺exhibits a better spherical structure and a higher specific area than GFe3 due to the support of the FeS nanospheres.To further increase structural advantage,polyvinyl alcohol was added to alginate hydrogel during in-situ pyrolysis,which successfully prepared a Fe/S porous carbon catalyst.The degradation rate of tetracycline was 99.56%,and it also had a certain removal rate on perfluorooctanoic acid.（2）Optimize the preparation conditions based on the ferric alginate single metal porous carbon catalyst to obtain a sodium alginate-based Fe/Co bimetallic MOF catalyst with controlled morphology and in-situ formation of CoFe nanocrystals.The effect is to achieve efficient activation of PMS,efficient activity and stability,and the preparation method is environmentally friendly and simple.The catalytic reaction system has high catalytic activity in the range of pH=3-9.The measurement results of free radicals in the reaction system show that single-line oxygen is the main active substance in the catalytic reaction system,it plays a certain auxiliary catalytic role and provides a basis for subsequent research.（3）Experiments were conducted with three actual water bodies,including surface water,ground water,and black odorous water.It was found that the porous carbon catalyst after heterogeneous Fenton catalytic treatment has a good removal effect on macromolecular organic matter,heavy metals and other pollutants in the water body.The catalyst material shows a high reusability after 5 runs of repetitive use,indicating that the porous carbon catalyst material has wide applicability and superior application potential in actual water treatment.