Study On The Preparation And Photocatalytic Degradation Properties Of Functional Paper Sheets

Adsorbents have usually been applied for the removal of environmental pollutants,and there have been many studies on TiO₂ photocatalysis for the removal of toxic materials from the environment.However,they have serious disadvantages,such as a pressure loss in the reaction tower,and difficulties in repacking them.It has been desired,therefore,to overcome these drawbacks.The composite sheets of titanium dioxide(TiO₂)and adsorbents were prepared by a papermaking technique.Firstly,the optimum conditions were investigated in order to require higher retention of stock components.The retention of sheetmaking stuffs was investigated in the system,such as the variety of flocculants, paper pulps,minerals and charge density ratio,they are more effective in the retention of inorganic materials.Secondarily,the composite sheets with photocatalytic property were investigated by the decoposing methylene blue dye in an aqueous solution under UV lights.The synergistic effect of the adsorptive capacity and photocatalytic decomposition by the composite TiO₂-diaomite sheets were expected to provide a solution to the above problem.In the present work,The efficiency of methylene blue dye degradation by the composite TiO₂-diatomite sheets was investigated for various ratios of TiO₂ to diatomite through the quantitative determination in the composite sheets.It was found that the composite TiO₂-dioatomite composite sheets could be utilized semi-permanently and was easier to handle than the original TiO₂ powders in aqueous media.Consequently,a composite TiO₂-diatomite sheet can be utilized as a high functional material to photodegradate organic pollution.The products and intermediates in the photocatalytic oxidation of formaldehyde and toluene were detected in the photoreactor.The experiments showed that compsite sheets exhibited an applicable photoactivity with the photochemical conversion efficiency in the degradation of formaldehyde and toluene.