Study On The Catalytic Performance Of Cobalt-based Composite In The Pickering Emulsion

With the rapid development of the society,the chemical industry has gradually become a pillar industry for the national economy.The chemical industry brings huge economic benefits to people,and it also has a serious impact on the environment.Due to the pollution of air and water resources,people's disease is gradually increasing.We recognize the seriousness of environmental pollution,but the governance is to create economic benefits,pollution and then take governance measures.This approach has caused the deterioration of environmental pollution problems in China,and researchers have adopted scientific methods to manage pollution.It has been found that catalytic technology can provide a method for solving environmental pollution?such as atmospheric and water pollution?.The catalyst can adsorb and transform organic chemicals in water to improve their environmental pollution.In this paper,Co₃O₄/g-C₃N₄,Co-g-C₃N₄ and Co-g-C₃N₄@rGO composites were synthesized by simple and effective methods,and the morphology and structure of the composites were characterized by XRD,SEM,TEM and BET.In terms of research and analysis,the properties of these composites were investigated by catalysis of potassium peroxymonosulfonate PMS.The research contents are as follows:?1?The Co₃O₄/g-C₃N₄ composite was synthesized by hydrothermal method.Then the SEM,TEM,XRD and other characterization methods were used to analyze the successful composite of Co₃O₄ and g-C₃N₄,and the structural properties of Co₃O₄/g-C₃N₄ were also analyzed.Finally,the catalytic effect of the composite was investigated by catalytic emulsification experiments.The results showed that the catalytic effect was the best when the molar ratio of ethylbenzene to PMS was 1:1,the amount of catalyst was 0.005 g,the reaction temperature was 80°C and the reaction time was 60 min,and during the experiment,the effect of emulsification dispersion of Co₃O₄/g-C₃N₄ is more uniform than that of pure Co₃O₄.This is because the addition of g-C₃N₄ increases the specific surface area of the composite Co₃O₄/g-C₃N₄ to provide more active sites for the catalytic reaction,and the catalytic emulsification effect is better.?2?The Co-g-C₃N₄ composite was synthesized by heating a mixture of dicyandiamide and cobalt acetate in the reaction.In the catalytic experiment,some conditions were changed to explore the optimal catalytic effect of Co-g-C₃N₄.Finally,a conversion ratio of 96.5%and a selectivity of 96.3%were obtained when the molar ratio was 1:1,the amount of the catalyst was 0.005 g,the reaction temperature was 80°C,and the time was 60 minutes.The possible reason is that g-C₃N₄ is the most stable carbonitride material.When g-C₃N₄ is added in the process of synthesizing the catalytic material,a heterojunction is formed between Co and g-C₃N₄,thereby improving the catalytic activity.?3?Co-g-C₃N₄@rGO was synthesized using dicyandiamide?DCD?,cobalt acetate tetrahydrate and GO water suspension as raw materials.Co-g-C₃N₄@rGO was analyzed from the morphology and structure by characterization tests such as SEM,TEM,BET,and the like.In the experiment,the catalytic conditions of Co-g-C₃N₄@rGO catalytic emulsification PMS were explored:the molar ratio of ethylbenzene to oxidant was 1:1,the amount of catalyst was 0.005g,the reaction temperature was 80°C,and the reaction time was60min.The conversion rate was 91.1%.However,compared with the graphene-free composite Co-C₃N₄,there is no conversion of Co-C₃N₄ catalysis.It may be because the graphene added during the reaction can provide a large specific surface area,but the single layer of graphene is likely to form a carbon deposit during the reaction to block the mesopores,thereby lowering the catalytic performance.