光催化降解氧氟沙星废水的研究
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摘要
采用溶胶-凝胶法制备了不同厚度的光催化剂TiO_2薄膜和掺杂银离子的TiO_2薄膜(Ag~+-TiO_2薄膜)。以紫外光为光源,考察了催化剂、p H值、氧氟沙星初始浓度和光照时间对降解效果的影响。研究结果表明,TiO_2薄膜和Ag~+-TiO_2薄膜以及其厚度对氧氟沙星的降解效果有明显影响;废水p H值的增加有利于光催化;氧氟沙星初始浓度越低,去除率越高;光照时间对TiO_2薄膜和Ag~+-TiO_2薄膜降解氧氟沙星效果有一定影响,但降解效率不是简单的随着光照时间的增加而增大或减小。
Photocatalyst TiO_2 films and Ag~+-TiO_2 films with different thickness were prepared by sol-gel method.The effects of photocatalyst, pH value, initial Ofloxacin concentration and illumination time on degradation were investigated using UV light. The results showed that TiO_2 films,Ag~+-TiO_2 films and their thickness had a significant effect on the degradation of Ofloxacin. The increase of pH value of wastewater is beneficial to photocatalysis. The lower the initial concentration of Ofloxacin was,the higher the removal rate of Ofloxacin was. The illumination time had certain effect on degradation of Ofloxacin by TiO_2 films and Ag+-TiO_2 films,but the degradation efficiency did not simply increase or decrease with the increase of illumination time.
Photocatalyst TiO_2 films and Ag~+-TiO_2 films with different thickness were prepared by sol-gel method.The effects of photocatalyst, pH value, initial Ofloxacin concentration and illumination time on degradation were investigated using UV light. The results showed that TiO_2 films,Ag~+-TiO_2 films and their thickness had a significant effect on the degradation of Ofloxacin. The increase of pH value of wastewater is beneficial to photocatalysis. The lower the initial concentration of Ofloxacin was,the higher the removal rate of Ofloxacin was. The illumination time had certain effect on degradation of Ofloxacin by TiO_2 films and Ag+-TiO_2 films,but the degradation efficiency did not simply increase or decrease with the increase of illumination time.
引文
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[2]HUGHES S R,KAY P B,ROWN L E.Global synthesis and critical evaluation of pharmaceutical data sets collected from river systems[J].Environ Sci Technol,2013,47(2):661-677.
[3]Zhao L S,Liang N,Lun X W,et al.LC-QTOF-MS method for the analysis of residual pharmaceuticals in wastewater:application to a comparative multiresidue trace analysis between spring and winter water[J].Analytical Methods,2014,6(17):6956-6962.
[4]许文倩.1,3-二醇二甲醚,双苯甲酸酯类齐格勒-纳塔催化剂内给电子体的合成与应用[D].天津:河北工业大学应用化学,2010.
[5]LIU S,GUO E Y,YIN L W.Tailored visible driven anatase TiO_2photocatalysts based on controllable metal ion doping and ordered mesoporous structure[J].J Mater Chem,2012,22:5031-5041.
[6]王毓宁,李鹏霞,胡花丽.Folin-酚法测定水蜜桃果酒中总多酚[J].酿酒,2012,39(5):60-62.
[7]梁振益,王军,陈平,等.桉树叶不同提取物对自由基的清除能力研究[J].食品科技,2009,34(5):204-206.