银钛共负载型光催化材料降解甲基橙废水

Photocatalytic degradation of methyl orange wastewater by co-deposited(Ag^+-TiO_2-EP) material

以膨胀珍珠岩为载体,采用溶胶凝胶法对其进行负载,制备出不同类型的光催化材料(TiO2-EP、Ag+-TiO2-EP),并在模拟日光条件下,研究其对甲基橙溶液的降解效果。结果表明,浸渍3次且担载0.04%Ag+的负载型TiO2光催化活性最高,在光催化剂用量为0.3 g,20 mL初始浓度为10 mg/L甲基橙溶液光照4 h后降解率可达81.6%,且甲基橙的光催化降解服从一级动力学方程。回收3次后仍有较强的活性,其2 h降解率为24.8%。

Different floating photocatalysts including TiO2-EP and Ag ＋-TiO2-EP were successfully synthe- sized by Sol-Gel method using tetrabutyl titanatc as precursor and expanded perlite （EP） as support. Under sim- ulative sunlight, the degradation rate of methyl orange by different photocatalysts, as well as the effect of different loading times, the dosage and the initial concentration of methyl orange were investigated. The results showed that Ag~ -TiO2-EP which modified three times with Ag＋ -TiOz（0.04% Ag＋ ） had the highest photocatalyst abili- ty. The degradation rate of the methyl orange solution （20 mL, 10 rag/L） which were decomposed by Ag~ -TiO2- EP （0.3 g） in4 hwas kinetic mode within the had the relatively higher ange was 24.8% within 81.6%. The reaction of photocatalysis for methyl orange can be expressed as first-order concentration range of methyl orange between 5 mg/L and 15 mg/L. Ag＋ -TiO2-EP still photoeatalytic activity after three times recycling and the degradation rate of methyl or- 2h