| The application of magnetic treatment technology has been widely used in mineral sorting,industrial circulating water descaling,agricultural production,building materials and other fields,and has produced significant economic and environmental benefits.Using an external magnetic field to influence and control the reaction process of aqueous solutions has become one of the research hotspots in the field of mineral material synthesis,in which the magnetic field has a particularly significant effect on the crystal growth of magnetic materials.On the basis of the systematic research on magnetized water,this thesis has carried out the research on the preparation of micro-nano Co metal materials by magnetic field synthesis method.The specific research work includes:The magnetization effect of magnetic water and the influence of magnetic field on calcium carbonate mineral crystallization.The contact angle measurement results of magnetic water show that the surface tension value reaches a minimum value of 68.85 m N/m under the action of a 300 m T magnetic field.The contact angle of deionized water can be reduced from 74.10° to 54.25° after magnetization at 400 m T for 1 hour.The absorption intensity of UV light by magnetized water in the range of 190-250 nm increased significantly with the increase of the magnetic field intensity.The conductivity of Na Cl solution reached a maximum value of 81.3 ms/cm after magnetization at 300 m T for 1 hour.The calcium carbonate nucleation experiment shows that under the action of a 400 m T magnetic field,the structure of the calcium carbonate precipitate changes into a needle-like structure with a certain direction.Magnetic field synthesis and structural control of cobalt micron flower.Using cobalt chloride hexahydrate as raw material,cobalt micron flower with different structures were synthesized under alkaline conditions by magnetic fields with intensities of 0 m T,25 m T,50 m T,200 m T and 400 m T.The adsorption isotherms of cobalt microflora are all type IV H3 isotherms.The results of VSM analysis showed that the cobalt micron flower synthesized under the magnetic field of 25 m T had the largest magnetic saturation intensity up to 162.5 emu/g,and the cobalt micron flower synthesized under the magnetic field of 200 m T had the smallest magnetic saturation intensity of 102.3 emu/g.Research on the properties of cobalt micron flower activated and degraded dyes.The results show that when the initial methylene blue solution is 100 mg/L,adding0.02 g/L cobalt micron flower and 0.4 g/L potassium hydrogen persulfate can degrade more than 95% of methylene blue in 25 minutes.The prepared cobalt micron flower has the best activation effect.For 100 mg/L methyl orange solution,adding 0.02 g/L cobalt micron flower and 0.2 g/L potassium hydrogen persulfate can obtain more than95% degradation effect within 20 minutes.Activation and degradation of chloronitrophenol by cobalt micron flower.Experiments show that cobalt micron flower can greatly accelerate the degradation efficiency of chloronitrophenol.When 0.04 g/L cobalt micron flower and 0.1 g/L potassium hydrogen persulfate were added,more than 95% of the degradation amount of 50 mg/L chloronitrophenol could be achieved.Among them,the cobalt micron flower synthesized under a magnetic field of 25 m T had the highest degradation efficiency,and could degrade more than 90% of chloronitrophenol in 10 minutes.The activation and degradation of chloronitrophenol by cobalt micron flower conformed to the first-order kinetic degradation model.Figure [33] Table [9] Reference [122]... |
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