用不同的方式制备了一系列载银TiO2/SiO2催化剂,并将其应用于可见光降解偶氮染料AO7,并对催化剂进行了XRD谱、SEM和BET表征.结果表明,Ag+的掺杂对催化剂的活性没有影响,而A0的掺杂能明显促进催化剂的活性,Ag0的最佳浓度为1%.在TiO2/可见光体系中,Ag0对催化剂活性的提高是因为A0加速了电子向溶解氧的转移,从而减少了染料正碳自由基和电子的复合.
参考文献
| [1] | Hoffmann M R;Martin S T;Choi W Y et al.Environmental of semiconductor photocatalysis[J].Chemical Reviews,1995,95:69. |
| [2] | Vinodgopal K;Winkoop D E;Kamat P V .Environmental photochemistry on semiconductor surfaces:photosensitized degradation of a textile azo dye,acid orange 7,on TiO2 particles using visible light[J].Environmental Science and Technology,1996,30:1660. |
| [3] | Bader H;Sturzenegger V;Hoigne J .Photometric method for the determination of low concentrations of hydrogen peroxide by the peroxidase catalyzed oxidation of N,N-diethyl-pphenylenediamine(DPD)[J].Water Research,1988,22:110. |
| [4] | Henmann J M;Tahiri H;Ait-Ichou Y et al.Characterization and photocatalytic activity in aqueous medium of TiO2 and Ag-TiO2 coatings on quartz[J].Applied Catalysis B:Environmental,1997,13:219. |
| [5] | Dobosz A;Sobcznski A .The influence of silver additives on titania photoactivity in the photooxidation of phenol[J].Water Research,2003,37:1489. |
| [6] | Zhao J;Wu T;Wu K et al.Photoassisted degradation of dye pollutants.3.Degradation of the cationic dye rhodamine B in aqueous anionic surfactant/TiOz dispersions under visible light irradiation:evidence for the need of substrate adsorption on TiO2 particles[J].Environmental Science and Technology,1998,32:2394. |
| [7] | Stathatos E;Petrova T;Lianos P .Study of the efficiency of visible light photocatalytic degradation of basic blue adsorbed on pure and doped mesoporous titania films[J].Langmuir,2001,17:5025. |
| [8] | Wu T;Liu G;Zhao J et al.Evidence for H2O2 generation during the TiO2一assisted photodegradation of dyes in aqueous dispersion under visible light illumination[J].Journal of Physical Chemistry B,1999,103:4862. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%