负载型Li/CNTS-TiO_2光催化剂降解海洋柴油污染的研究及应用
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摘要
为研发高效复合光催化剂降解海洋石油污染,采用溶胶-凝胶法成功制备Li/CNTS-TiO_2复合光催化剂,并在聚丙烯多面球上负载得到负载型Li/CNTS-TiO_2光催化剂,运用X射线衍射(XRD)、扫描电镜(SEM)等技术对Li/CNTS-TiO_2光催化剂进行表征,在室外光照条件下,考察了催化剂负载量、反应时间、柴油初始浓度等因素对催化剂去除海水中柴油污染的影响,用正交试验法确定了负载型Li/CNTS-TiO_2光催化剂处理海洋柴油污染的优化条件,并利用自制的模拟海洋石油污染装置在室外条件下进行了较大规模的验证试验。结果表明:将2.0 g复合型Li/CNTS-TiO_2光催化剂负载于两个聚丙烯球上得到负载型Li/CNTSTiO_2光催化剂,当柴油初始浓度为100 mg/L、室外光照时间为4 h时,柴油去除率最高(91.87%);在自制模拟海洋石油污染装置条件下,负载型光催化剂可以连续使用且对初始浓度为10 mg/L的柴油光催化降解效果良好,降解率达到92.89%;负载型Li/CNTS-TiO_2光催化剂对初始浓度为100 mg/L的原油光催化降解率为99.72%。研究表明,Li/CNTS-TiO_2光催化剂为海洋柴油污染的处理提供了一种环境友好的途径。
The Li/CNTS-TiO_2 composite photocatalysts were successfully prepared by sol-gel method and the supported Li/CNTS-TiO_2 photocatalysts were obtained by loading Li/CNTS-TiO_2 on the surface of polypropylene spheres and were characterized by XRD,SEM and other methods. The photocatalytic degradation efficiency of diesel was investigated under outdoor light conditions by various parameters including amount of catalyst used for load,reaction time and the initial concentration of diesel to optimize conditions for the treatment of marine diesel pollutant by Li/CNTS-TiO_2 photocatalyst. A large-scale verification test was carried out with a homemade simulated device that simulated the marine environment under outdoor conditions,and the supported Li/CNTS-TiO_2 photocatalyst was obtained by loading 2.0 g Li/CNTS-TiO_2 photocatalyst on the surface of two polypropylene spheres. The removal diesel rate of 91.87% was observed at initial diesel concentration of 100 mg/L for 4 h under outdoor light.The supported Li/CNTS-TiO_2 photocatalyst was continuously used with good removal effect under the conditions of self-made simulated marine oil pollution device,with the photocatalytic degradation rate of 92.89% for diesel and99.72% for crude oil,indicating that the supported Li/CNTS-TiO_2 photocatalyst is a friendship photocatalyst for treatment of marine diesel pollution.
The Li/CNTS-TiO_2 composite photocatalysts were successfully prepared by sol-gel method and the supported Li/CNTS-TiO_2 photocatalysts were obtained by loading Li/CNTS-TiO_2 on the surface of polypropylene spheres and were characterized by XRD,SEM and other methods. The photocatalytic degradation efficiency of diesel was investigated under outdoor light conditions by various parameters including amount of catalyst used for load,reaction time and the initial concentration of diesel to optimize conditions for the treatment of marine diesel pollutant by Li/CNTS-TiO_2 photocatalyst. A large-scale verification test was carried out with a homemade simulated device that simulated the marine environment under outdoor conditions,and the supported Li/CNTS-TiO_2 photocatalyst was obtained by loading 2.0 g Li/CNTS-TiO_2 photocatalyst on the surface of two polypropylene spheres. The removal diesel rate of 91.87% was observed at initial diesel concentration of 100 mg/L for 4 h under outdoor light.The supported Li/CNTS-TiO_2 photocatalyst was continuously used with good removal effect under the conditions of self-made simulated marine oil pollution device,with the photocatalytic degradation rate of 92.89% for diesel and99.72% for crude oil,indicating that the supported Li/CNTS-TiO_2 photocatalyst is a friendship photocatalyst for treatment of marine diesel pollution.
引文
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[2]李先梅,肖易,吴芸紫,等.华北油田石油污染土壤的修复植物筛选[J].环境科学与技术,2015,38(6):14-19.
[3]Fujishima A,Honda K.Electrochemical photolysis of water at a semiconductor electrode[J].Nature,1972,238(5358):37-38.
[4]施冬梅,李再兴,多金环.纳米Ti O2光催化降解水体污染物研究进展[J].环境科学与技术,2002,25(5):46-48,51.
[5]盖方媛.纳米Ti O2在重金属离子检测及固废物用于光催化降解有机污染物的研究[D].烟台:烟台大学,2014.
[6]高晓曦.铁掺杂二氧化钛纳米管的制备及其光催化与电性能研究[D].长春:吉林大学,2015.
[7]Nguyen-Phan T D,Pham V H,Cuong T V,et al.Fabrication of Ti O2nanostructured films by spray deposition with high photocatalytic activity of methylene blue[J].Materials Letters,2010,64(12):1387-1390.
[8]张健,刘海映,季秋忆,等.纳米Sn O2光催化剂的制备及其光催化降解海洋柴油污染的研究[J].大连海洋大学学报,2016,31(4):438-443.
[9]杨连利,张卫红,郭乃妮.天然产物负载型光催化剂在有机污染物处理中的研究进展[J].应用化工,2016,45(7):1344-1347.
[10]于晓彩,徐晓,金晓杰,等.Li+-Ti O2复合纳米光催化剂制备及其光催化降解海产品深加工废水的研究[J].大连海洋大学学报,2015,30(4):410-416.
[11]张艳辉,田彦文,赵迎宪,等.半导体氧化锌的制备及其光催化性能研究[J].兵器材料科学与工程,2008,31(1):60-63.
[12]聂志伟,于晓彩,尹丹妮,等.碳素纤维在近岸海洋污染物亚硝酸盐、总氨态氮处理中的应用[J].大连海洋大学学报,2017,32(4):473-478.