| SiO2纳米粉掺杂对薄膜光催化剂结构和活性的影响 |
| 摘要点击 1930 全文点击 1181 投稿时间：2001-11-18 修订日期：2002-02-24 |
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| 中文关键词 光催化氧化 TiO2薄膜 SiO2掺杂 稳定性 |
| 英文关键词 photocatalytic oxidation TiO2 thin film SiO2 doping stability |
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| 中文摘要 |
| 针对固定膜光催化剂吸附能力差的缺陷,在催化剂的涂覆溶胶中掺杂具有较大比表面积的SiO2纳米粉制备了一种新的TiO2薄膜.通过X射线衍射(XRD)、扫描电镜(TEM)和红外光谱(FTIR)等手段对催化剂进行表征发现,催化剂的晶相以锐钛矿为主,并含有少量的金红石,平均晶粒尺寸为27nm左右.其中掺杂的SiO2以十几到几十纳米的无定型团簇形式分散于薄膜中,除了能增大薄膜的表面积外,对TiO2的晶体结构和表面基团等性质几乎没有影响.光催化降解试验表明,SiO2掺杂后薄膜的活性大大改善,并受掺杂SiO2的原始粒径和掺杂量影响很大.此外,该催化剂还具有很好的稳定性,在连续30多天的使用中,对活性艳红X-3B的去除率一直维持在80%左右,活性未见降低. |
| 英文摘要 |
| Regard to the poor adsorbability of the fixing film photocatalyst,a new TiO2 thin film by doping the nanosized SiO2 powder with large specific surface area into sol for coating film was prepared.Accoring to the results of characterization by XRD,SEM,FTIR techniques,it was found that the films were mainly anatase structrue,containing a little rutile and its mean crystallite size was about 27nm.And doped SiO2 was dispersed into films forming the amorphous cluster with the size form more than ten nanometers to scores of nanometers.The doping of SiO2 had no effect on the crystal structure and the surficial group of TiO2,except for increassing specific surface area.The result of photocatalytic degradation showed that activity of the film doped by SiO2 largely increased and was greatly influenced by the size and amount of doped SiO2.Besides,this photocatalyst also had very good stability.During the course of continuous experiment for more than 30 days,removal efficiency of reactive brilliant red X-3B was kept at about 80% all the time. |
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