Photocatalytic degradation of humic acids using substrate-supported Fe3+-doped TiO2 nanotubes under UV/O3 for water purification
Photocatalytic degradation of humic acids using substrate-supported Fe3+-doped TiO2 nanotubes under UV/O3 for water purification
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DOI：
10.1007/s11356-015-4910-z
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发表时间：
2015-07
影响因子：
5.8
通讯作者：
Rongfang Yuan;Beihai Zhou;Xuemin Zhang;Huanhuan Guan
中科院分区：
文献类型：
--
作者：
Rongfang Yuan;Beihai Zhou;Xuemin Zhang;Huanhuan Guan
本文采用水热法成功制备了Fe 3+掺杂的TiO 2纳米管（Fe-NTs）。四种不同类型的基板，更具体地说，陶粒，沸石，活性氧化铝和活性炭（AC），已在研究中进行了调查。在O3/UV条件下，利用负载型Fe-TNT对水中腐殖酸（HA）进行了有效降解。实验结果表明，活性炭负载量为1.0原子%时，光催化活性最高在500 °C下焙烧的Fe-TNT对HAs的去除率为97.4%，准一级反应速率常数为0.126/min。然而，即使在催化剂重复使用5次后，在AC负载的催化剂存在下的HAs的去除效率为78.5%，在水处理中仍然是足够的。活性炭负载Fe-TNT的光催化活性增强与活性炭吸附和Fe-TNT光催化臭氧氧化的协同效应有关。
In this paper, Fe3+-doped TiO2nanotubes (Fe-TNTs) were successfully synthesized using hydrothermal method. Four different types of substrates, more specifically, ceramsite, zeolite, activated alumina, and activated carbon (AC), have been investigated in the study. The substrate-supported Fe-TNTs were used to effectively decompose humic acids (HAs) in water under O3/UV conditions. The experiment results show that the highest photocatalytic activity was obtained in the presence of AC-supported 1.0 atomic percent (at.%) Fe-TNTs calcined at 500 °C, as HAs was removed by 97.4 %, with a pseudo-first-order rate constant of 0.126/min. The removal efficiencies of HAs reduced when the catalysts was repeatedly used, since the amount of adsorption sites of the supporting substrates decreased. However, even after the catalyst was repeatedly used for five times, the removal efficiency of HAs in the presence of AC-supported catalyst, which was 78.5 %, was still sufficient in water treatment. The enhanced photocatalytic activity of AC-supported Fe-TNTs was related to a synergistic effect of AC adsorption and Fe-TNT photocatalytic ozonation.