通过溶胶-凝胶法,以CNTS-TiO2为前驱物制备了Li+掺杂CNTS-TiO2的纳米复合光催化剂(以下均称为Li+/CNTS-TiO2),采用X射线衍射(XRD)、扫描电镜(SEM)等测试手段对光催化剂进行表征,结果表明制得的催化剂为纳米材料且在TiO2的基础上增大了比表面积。利用掺杂量为3%的Li+掺杂CNTS-TiO2复合光催化剂(以下均称为3%Li+/CNTS-TiO2)光催化降解海洋柴油污染,在可见光条件下考察了Li+掺杂量、煅烧温度、光催化剂投加量、柴油初始质量浓度、光催化反应时间、H2O2质量浓度等条件对光催化实验的影响。进行正交实验,确定最优化工艺条件为:Li+掺杂量为3%,光催化剂的煅烧温度为600 ℃,3%Li+/CNTS-TiO2的投加量为0.1 g/L,降解柴油初始质量浓度为0.4 g/L,光催化反应时间为3 h,H2O2质量浓度为0.6 g/L,降解率可以达到95%以上。同时对此光催化剂进行应用试验,试验结果表明光催化剂去除效果优异,去除率可达91.87%。
Abstract
Li+-doped nano-CNTS-TiO2 composite photocatalyst (Li+/CNTS-TiO2 composite photocatalyst) was prepared by sol-gel method using CNTS-TiO2 as precursor. The sample was characterized by X-ray diffraction and Scanning electron microscope methods. The photocatalytic degradation of marine diesel was carried out using the 3% Li+/CNTS-TiO2 composite photocatalyst. The effects of different factors, such as the amount of Li+ doping, calcination temperature, dosage of 3% Li+/CNTS-TiO2 composite photocatalyst, initial diesel concentration, photocatalytic reaction time and H2O2 concentration were investigated under visible light conditions. According to the analysis of orthogonal test results, the optimum process conditions for degradation of marine diesel pollution with 3% Li+/CNTS-TiO2 composite nano-photocatalyst were as follows: calcination temperature of 3% Li+/CNTS-TiO2 composite nano-photocatalyst at 600 ℃, photocatalytic reaction time at 3 h, dosage of 3% Li+/CNTS-TiO2 at 0.1 g/L, initial concentration of degraded diesel at 0.4 g/L, concentration of H2O2 at 0.6 g/L. Using these conditions, the degradation rate could reach more than 95%. At the same time, the photocatalyst was applied and tested. The test results showed that the photocatalyst degradation effect was excellent, and the degradation rate was up to 91.87%.
关键词
3% Li+/CNTS-TiO2复合光催化剂 /
纳米 /
光催化降解 /
海洋柴油污染
Key words
3% Li+/CNTS-TiO2 composite photocatalyst /
nanometer /
photocatalytic degradation /
marine diesel pollution
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基金
国家海洋局海洋公益性行业科研专项经费项目资助(20130500);辽宁省科学事业公益研究基金项目资助(20170002);辽宁省海洋与渔业厅科研项目资助(201733)
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