The Study On The Preparation And Properties Of Diatom Ooze Which Can Adjust Humidity And Degrade Formaldehyde

With the improvement of living standards in recent years,people's comfort and safety requirement of living environment are becoming higher and higher.However the resource of our country is depleting day and night,the environment pollution is increasingly serious,there is doubt that saving resources,the development of the ecological environment material has become the main direction of the development of modern materials.Diatomite as a kind of porous material with very strong adsorption properties can be prepared by adding mineral fiber and nano titanium dioxide and other materials to achieve better moisture transfer performance and the effect of adsorption and degradation of formaldehyde.This paper mainly aimed at the diatom ooze humidifying property of single factor experiment and orthogonal experiment,get the optimal ratio of humidity-control performance,diatom ooze pore size distribution are obtained by mercury injection method to study the effect of the humidity-control performance.Then on this situation the diatomite which not only have the humidity-control performance but also can adsorb and degrade formaldehyde is studied and prepared.The orthogonal experiment of humidifying property study use silicon ash powder?diatomite powder,concave-convex rod powder content as the influencing factors,and put the wet absorption rate as evaluation index for the three factors three levels orthogonal experiment.Prepare 9 group sample to get the optimal ratio of A2B3C3.The moisture releasing property is 4.82%and the moisture absorption property is9.70%,when diatomite 55%,silicon ash powder 25%,concave-convex rod powder 10%,diatomite affects the most significant,concave-convex rod powder take the second place.Through mercury pressure test orthogonal experiment on the situation of the best optimal ratio of moisture releasing and absorption property shows that it's helpful to the moisture releasing and absorption property of diatomite when the pore size is between 300?1500nm.500?1200 nm pore ratio is bigger,the hole is formed between filler.300?500 nm pore scale is smaller pore packing itself.By SEM microscopic analysis to diatomite original soil and the diatomite calcine under 400 ?,600 ?,600 ? for two hours,found the diatomite original soil with some impurities in the pore.As the calcination temperature increased and impurities gradually reduced.At 600 ?,the impurities almost completely disappeared,the pore is completely exposed when Calcination temperature reaches 800 ?,diatomite monomer and aperture edge appear rupture,diatomite porous adsorption performance with a certain degree of damage.Degradation of formaldehyde adsorption experiment,first has carried on the nano TiO2 scope determine the experiment,and also use the method of orthogonal optimization by calcining temperature,dosage of nanometer titanium dioxide and dosage of dispersants for influence factors of formaldehyde degradation percentage as evaluation index,three factors three levels of nine groups optimization experiment.The best optimal ratio of diatom ooze is A2B2C2,The calcination temperature is 600 ? and calcine 2 hours,nano TiO2 content was 1.5%,dispersant dosage was 0.5%,calcination temperature effect is significant,nano TiO2 effect take the second place,Degradation of formaldehyde percentage is 77.06%,and the surface does not appear crack,formaldehyde degradation rate is higher,achieve the effect of formaldehyde degradation.Using the ratio of the other conditions unchanged,the diatomite mixed with diatom ooze respecively under different calcination temperature,also found that 600 ? calcination wet soil preparation of sample performance is optimal,moisture absorption rate can reach9.78%,moisture releasing rate can reach 5.33%,were superior to calcine soil preparation of diatom ooze.For the best degradation optimal ratio of mercury injection tests,pore size distribution is still in the range of 300?1500 nm,but 300?500 nm porosity increased obviously,suggests that diatomite pore aperture size is more advantageous to wet formaldehyde degradation and improve the optimization performance.