Preparation Of Photocatalytic Composite Microspheres And Study On The Removal Of Indoor Formaldehyde

TiO₂ photocatalytic materials have the advantages of good chemical stability,high efficiency,low cost and little pollution to the environment,and it has broad application prospects in the field of environmental protection,water treatment,degradation of organic pollutants,etc.TiO₂ powder size is difficult to control,easy to reunite in the application,can not achieve the desired effect of light;In addition,TiO₂nano powders in the process of using existing easy deactivation and difficult to recycle,low light quantum yield.To solve the above two problems,the research and application of urea formaldehyde polymerization?melamine?hybrid was prepared with network structure rich in nano TiO₂/urea formaldehyde?melamine?crosslinked composite microspheres,the functional powder loaded on the polymer microspheres,the photocatalytic nano materials are dispersed and fixed,the nano functional materials and micron grade polymer microspheres composite as a whole,so that we can solve the problem of agglomeration of nano materials,and facilitate its recovery and utilization.On the basis of the above,it can also be used for more complex doping and modification of photocatalyst,which can achieve the utilization of visible light and improve the photocatalytic activity.4 kinds of rare earth doped nano TiO₂ were prepared by the method of"Pickering"polymerization,and the composite photocatalytic materials loaded on amino resin microspheres were prepared.The loading of TiO₂ was achieved.The microstructure and optical properties of the materials were characterized by Fe-SEM and UV-Vis diffuse scattering spectroscopy.The formaldehyde removal experiment was simulated in the static chamber by using the gas formaldehyde as pollutant,and the photocatalytic efficiency was tested under the ultraviolet lamp and the incandescent lamp.The results showed that lanthanum oxide photocatalysts doped with different amounts of electron microscope showed microsphere appearance,size 1²?m,with different morphology doping amount of different microspheres which molding"MFPL-2 P25/LaO/melamine microspheres"best,there are a lot of ribbon between the largest amount of doped MFPL-3 microspheres."MFP P25/melamine microsphere"photocatalyst microsphere forming poor,no rules for the formation of microsphere but tended to form larger particles of spherical aggregates;EDX results showed that the surface elements of Ti and La elements,the corresponding material has been loaded on the composite microspheres,the formation of a new different from the pure P25 and MF resin the new material with photocatalysis function;UV-Vis absorption spectrum red shift and enhancement phenomenon,in which the sample MFPL doped rare earth's most prominent absorption phenomenon in the visible range,was increase showed that the material can effectively utilize light in the wavelength range;after photocatalytic composite microspheres modified in the UV lamp under the irradiation of incandescent lamp and has a very good photocatalytic property;light intensity has a great influence on the catalytic effect,with the increase of laser power,the degradation rate of formaldehyde by Gradually increased;doping of rare earth elements and fixed P25,can effectively promote the quantization effect of P25 light,broaden the influence range of TiO₂ photocatalyst,effectively improve the performance of commercial nano split;rare earth doped and loaded composite photocatalyst was type size 1³?m microspheres,respectively,82%and 75%on the degradation efficiency formaldehyde gas is 400 DEG C;baking treatment,catalytic performance deterioration of microspheres;comparison of rare earth doped TiO₂,only the load sample function of formaldehyde degradation reaction disappeared early,late photocatalytic efficiency.It shows that the doped rare earth and fixed TiO₂ can effectively broaden the range of light response of TiO₂ and improve its application performance.