Effect Of Rare Earth Complex On Negative Oxygen Ion Release And Infrared Radiation Characteristics Of Tourmaline

Tourmaline is widely used in water pollution treatment,functional textiles,interior coatings and many other fields due to its negative oxygen ion release characteristics and infrared radiation characteristics.It has become an important environmental functional material.Tourmaline is used in powder form in most fields,and application performance can be improved by changing the particle size,selecting different compositions of tourmaline and rare earth complexes.In this paper,the influence of particle size on the spontaneous polarization of tourmaline was investigated,and the influencing factors of the negative oxygen ion release of different components of tourmaline were studied.On this basis,rare earth elements are used to modify the tourmaline with weak negative oxygen ion release properties to improve its practical application value.The influence of particle size and polarization frequency on the spontaneous polarization characteristics was investigated by selecting different particle sizes of tourmaline for hysteresis loops and the variation of polarization intensity with temperature.The results show that the smaller particle size tourmaline has less remnant polarization,and the polarization intensity changes slowly with temperature.This shows that the self-polarization performance of tourmaline is reduced after particle size reduction,which is related to the defects and residual stresses generated within the tourmaline during grinding.The hysteresis loop test results of the samples at different polarization frequencies show that the remanent polarization,the maximum polarization and the coercive field all decrease with the decrease of the frequency,indicating that the low polarization frequency is conducive to the steering of the galvanic couple.In addition,four tourmaline powders with different compositions of about 2000 meshes were prepared,and three factors that affect the negative oxygen ion release specific surface area,composition,and spontaneous polarization characteristics were analyzed.The results showed that the negative oxygen ion release of the studied samples was less affected by the specific surface area,which was mainly related to the FeO content.The negative oxygen ions released by the tourmaline samples with relatively small FeO content were relatively large.The content of FeO in the cell affects the dipole distance within the crystal structure,which results in different electrostatic fields at both ends of the crystal.On this basis,the coprecipitation method was used to modify rare earth tourmaline with the lowest negative ion oxygen release,and the negative oxygen ion release and infrared emissivity of the composite were measured.The results show that the combination of rare earths(Ce,La,Pr)and tourmaline makes the negative oxygen ion release properties improve,and the effect of Ce element improvement is best,and only the combination of Ce elements enhances the infrared radiation performance of the material.XPS was used to further detect the existence of rare earth elements in the composites and the valence state of Fe elements,and further analyzed the effect of rare earth complexes on the valence state of Fe in the crystal structure of tourmaline.The total beta activity concentration of tourmaline after tourmaline complexation is approximately 10 times that of the original tourmaline.The total alpha activity concentration is 1.5-3 times the original,but it is within the safety range of ionizing radiation and can be practically used.