Synthesis Of Ag₃PO₄/TiO₂ Composites And Research Onformaldehyde Degradation

Formaldehyde is the main indoor pollutant,which seriously effects people’s physical and mental health.At present,indoor decorative fabric only has space beautification function.The urgent need is to develop the functional textiles with the beautification and purification property by using the new technology of material preparation and connecting with environmental protection,antibacterial materials and textiles.This study first design the preparation process of new photocatalysis materials Ag₃PO₄ and TiO₂ and synthesis cooperative catalysis Ag₃PO₄/TiO₂ composite material,then connect the Ag₃PO₄/Ti O₂ composite material with cotton fabrics through the finishing process to prepare multi-functional textiles with formaldehyde degradation and antibacterial functions,which implements the function of the textile"beautify and purify the environment".The main research work and conclusions are as follows:（1）First,explored the control process of Ag₃PO₄ morphological by precipitation conversion and dissociation equilibrium technologies.By changing different phosphorus source,alkali agent to adjust and control the morphology of Ag₃PO₄,we successfully prepared cubic,triangular pyramid,spherical and rhombic dodecahedron Ag₃PO_4.The XRD analysis shows that the crystals orientations of the four morphological Ag₃PO₄ are the same;The FTIR test indicates that the morphology do not cause the infrared inorganic vibration peak deviation.The results of the SEM show that the four types of morphological Ag₃PO₄ samples obtained are distinct and uniform in size.Photocatalytic studies have shown the photocatalytic performance of different morphology Ag₃PO₄ and there is a difference between their photocatalytic performance,photocatalytic degradation of rhodamine B tests show that the catalytic ability of the samples are rhombic dodecahedron>cube>spherical>triangular pyramid.（2）Through a series of exploring process,anatase crystal type and high purity of Ag₃PO₄/TiO₂ composite nanomaterials was successfully prepared.SEM and TEM test show that the Ag₃PO₄ evenly attached on the surface of TiO₂ particles,composite samples are of uniform particle size.The results of photocatalytic experiments show that compared with pure TiO₂,the composite is more efficient under visible light and the degradation efficiency of rhodamine B is greatly improved.The sample A/T-3%shows the best photocatalytic efficiency.This is because the increase of Ag₃PO₄ can inhibit the combination of electrons and holes and promote its separation,excessive Ag₃PO₄ may influence the utilization of visible light,so the best dosage should be controlled at 3%.（3）The Ag₃PO₄/TiO₂ composite was arranged into cotton fabric,and the degradation experiment of formaldehyde was carried out in the experimental device.By exploring the finishing agent concentration,dipping temperature,initial concentration of HCHO,environment temperature,amount of Ag₃PO₄ composite we have found that when the concentration of finishing agent is 20 g/L,dipping temperature is 50℃,the general effect is the best,and its breaking strength did not change;In a certain concentration interval,the lower the initial formaldehyde concentration is,the better the degradation effect is.Increasing the temperature can help formaldehyde degrade;A/T-3%has the best effect.（4）The antibacterial effect of Ag₃PO₄/TiO₂ composites has been discussed.Pure TiO₂antibacterial effect is not ideal,Ag₃PO₄ has good antibacterial effect.Morphology has effect on the antibacterial property,so the cubic is the best.The antibacterial property of TiO₂ obviously increases with the increase of the content of Ag₃PO₄,the treated fabric with A/T-3%shows good antimicrobial property.