摘要
针对TiO2光催化反应中易出现电子-空穴对(e--h+)的复合、而Fenton技术又面临铁污泥的问题,向TiO2光催化反应中加入零价铁(Fe0)。通过调节溶液pH,使Fe0缓释Fe2+,且反应之后的pH仍能满足TiO2光催化反应所需。溶液中的Fe2+,一方面能减弱TiO2光催化产生的e--h+的复合,提高TiO2光催化反应的效率;另一方面,在紫外灯照射下也可以起到光Fenton降解作用。研究结果表明,Fe0共存下TiO2光催化对废水的降解率高于单独使用TiO2光催化或光Fenton对废水的降解率。对Fe0共存下TiO2光催化降解废水的褪色率的动力学研究表明,该反应属于三级动力学反应,且其对有机物的降解具有TiO2光催化和光Fenton加合增效的效果。
Given the problem of electron-hole pair（e--h＋）recombination in TiO2 photocatalytic reaction and iron sludge production in Fenton technology,the author adding zero-valent iron（Fe0）into TiO2 photocatalytic reaction system to solve the above mentioned issues.By adjusting pH of the solution,Fe0 could release Fe2＋slowly,and make the solution pH constantly meet the requirement of TiO2 photocatalysis.The Fe2＋in solution could weaken the recombination of electron-hole pair（e--h＋）therefore enhance the efficiency of TiO2 photocatalytic reaction;on the other hand,the photo-Fenton degradation was also performed under the ultraviolet light.With the coexistence of Fe0,the performance of TiO2 photocatalysis on wastewater degradation was greatly improved,which was superior to that of single TiO2 photocatalysis and single optical Fenton process.The kinetic of wastewater degradation by TiO2 photocatalysis combined with Fe0 was studied,results showed that the fading rate of wastewater was in agreement of three kinetics model,TiO2 photocatalysis and Fenton process had synergistic effects on organic degradation.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第11期46-49,54,共5页
Environmental Pollution & Control
