The Preparation Of RGO Modified TiO₂ Mesporous Films And Photocatalytic Property

Waster-water from manyindustries includesmental iconswith recovery value?Ag⁺etc?and with toxicity(Ni²⁺etc),involving organic pollutants with tremendous harm for human and ecosystem.Photocatalytic technology of semiconductor with nontoxic,low cost and high catalytic efficiency has regarded as the promising methods for Waster-water treatment.Although the photocatalytic Ti O₂ materials possess a series of advantages,such as lost cost?stable property and so on,still it is limited by some factors,such as low utilization efficiency for sunlight?Eg=3.2e V?,high recombination of the photo-generated carriers.In the meanwhile,the recycle and hardness of powder Ti O₂ is hard so as to limit its industrical application.The above drawbacks can be overcome by incorporating graphene with excellent electrical conductivity and great specific surface area into Ti O₂ to prepare mesporous films photocatalytic materials.Photocatalytic properties of RGO modified Ti O₂ mesporous films prepared by dip-coating method for different mental icons-organs systems(Ag⁺-MO?Ni²⁺-SDBS)were studied.The main results were summarized as follows:1?Citric acid as hydrolysis inhibitor of tetrabutyl titanate?TBT?could utilize the complexing action to obtain mesoporous RGO-Ti O₂ films with chemical bonds.The introduction of RGO could effectively capture photogenerated electron,inhibit the recombination of photogenerated electron-hole pairs,prolong the life of photoproduction electronics and enhance the photocatalytic efficiency,as well as prompt the light of the photocatalyst response range extended to visible light area;2?Reduction efficiency of 1.0wt%RGO-Ti O₂ films for Ag⁺exceeded93%at 80min when catalyst dosage=10 pieces?initial Ag⁺concentration=20mg/L and the solution p H?7 and reduction reaction of Ag⁺followed the pseudo first-order kinetics model;Photocatalytic degradation efficiency of1.0wt%RGO-Ti O₂ films after reduction Ag⁺for methyl orange was superior to films without silver;3?Degradation efficiency of 1.0wt%RGO-Ti O₂ films for MO could be93%at 120min when catalyst dosage=8 pieces and when the above films were successsively utilized for four times,degradation efficiency of MO still exceeded 81%;4?Reduction and degradation efficiency of 1.0wt%RGO-Ti O₂ films for Ni²⁺and SDBS could be 74%and 86%at 80min respectively when the solution p H?9 and 6,respectively.The fact that Photocatalytic efficiency in{Ni²⁺/SDBS}hybrid system is higher than single system indicated that synergistic reaction existed between Ni²⁺and SDBS.