Study On The Composite System Of TiO₂/Montmorillonite And Its Environmental Characteristics Of Antibacterial Effect And Humidity-control

The worldwide continually strengthened consciousness of environmental protection and more and more scarcity of traditional materials provide the social background and the ecology significance for researches on antibacterial and humidity-controlling materials. Research on the composition of nano-metric titanium dioxide and porous mineral substrate materials is one of the hotspots of current researches. It can not only settle the problem of dispersion and immobilization of TiO₂, but also accelerate the mass transfer and consequently enhance the efficiency of photocatalytic reaction through the ability of substrate to adsorb the reactants and enrich their concentration in the surface region of photocatalyst. At present, the composite photocatalyst of TiO₂ loaded on porous mineral materials has demonstrated an advantage of high efficiency in the degradation and decoloration of organic wastewater, but there are few reports concerned with the aspect of antibacterial effect and humidity control.This research aimed at preparing the environment mineral material with bacteriostatic and humidity-controlling characteristics by loading nano-TiO₂ onto montmorillonite, and providing theoretical basis for its application in indoor decorative coatings, home appliances and ceramic surface ornament coatings, etc. The main contents of this research were as follows: 1. Preparation and characterization of the composite system of TiO₂/Mmt.This system was prepared with sol-gel method. The combination and molar ratio of each reactants in the precursor system was discussed, And the synthesis conditions was optimized through orthogonal experiments. XRD, FTIR as well as AFM technologies were adopted to characterize and analyse the crystal and molecular configurations and surface appearances of the composite system.The optimum synthesis conditions obtained from the experimental results were as follows: the molar ratio of reactants in the precursor of TiO₂ was Ti(OC₄H₉)₄: C₂H₅OH: HNO₃: H₂O=1: 15: 0.3: 3. The ratio of Ti(IV) to montmorillonite was 15 mmol/g, and the mass concentration of montmorillonite suspension was 3%. The...