Preparation And Properties Of Bismuth Tungstate Photocatalytic Materials

Bi₂WO₆ catalysts were successfully prepared by sol-gel method and porous CTAB catalysts with good photocatalytic properties were prepared by using Bi₂WO₆.The catalysts were characterized by XRD,FT-IR/Fir,UV Vis,BET/BJH,FS and XPS,and the effects of different addition amount and calcination temperature on the degradation ability of the catalysts were explored.The degradation process of azophloxine was analyzed by UV Vis,FT-IR and IC.The experimental results are as follows:（1）Bi₂WO₆ catalyst was successfully prepared by adding different amounts of CTAB.The optimum addition amount was 1.5g and the optimum calcination temperature was 450 ^OC.After adding CTAB,the crystal size of the catalyst decreased significantly,the specific surface area and pore volume increased,which were mainly composed of perovskite[WO₄]^2-layer and bismuth oxide[Bi₂O₂]²⁺layer alternately.When CTAB was added,the concentration of hydroxyl radicals on the surface of the catalyst increased and the photocatalytic activity was improved.（2）The supported catalyst was prepared with hollow glass bead i M30K as support.The density of 1.5C-Bi₂WO₆/iM30K decreases after loading.When the loading amount is 20%,the electron hole survival rate of the material is the highest,which can produce the most hydroxyl radicals,and the photocatalytic activity of the sample is the highest.（3）The supported catalyst was prepared by using molecular sieve HZSM-5 as support.The optimum loading capacity of HZSM-5 catalyst is50%.With the increase of loading capacity,the grain size of the catalyst increases gradually,and the specific surface area and pore volume decrease.The highest photocatalytic activity was obtained when the molecular sieve loading amount was 50%.When the photocatalytic reaction time reached 50min,azophloxine was completely dissolved.Ultraviolet light also produced the highest number of hydroxyl radicals.