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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (12): 1438-1444. 上一篇    下一篇

研究论文

席夫碱铁-TiO2复合物光催化降解有毒有机污染物

曹婷婷，罗光富，邹彩琼，赵小蓉，李瑞萍，黄应平*   

  1. (三峡库区生态环境教育部工程研究中心(三峡大学) 宜昌 443002)
  • 投稿日期:2010-10-10 修回日期:2011-01-23 发布日期:2011-02-18
  • 通讯作者: 黄应平 E-mail:chem_ctgu@126.com
  • 基金资助:

    可见光诱导铁(II)基有机复合物活化分子氧降解微囊藻毒素;三峡库区水环境与生态恢复;三峡库区香溪河流域水污染防治与生态修复技术

Degradation of Toxic Organic Pollutants by Iron(III) Schiff-base/TiO2 Complex Under Visible Irradiation

CAO Ting-Ting, LUO Guang-Fu, ZOU Cai-Qiong, ZHAO Xiao-Rong, LI Rui-Ping, HUANG Ying-Ping   

  1. (Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002)
  • Received:2010-10-10 Revised:2011-01-23 Published:2011-02-18

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运用化学合成方法制备了双(5-磺酸钠水杨醛)邻苯二胺席夫碱[N,N -Bis-schiff-base-5-sulfonate-salicylalidene- o-phenylenediamine sodium, SSPA]铁(III)配合物(FeSSPA), 采用无机钛盐醇解法制备了席夫碱铁-TiO2复合物催化剂(FeSSPA-TiO2). 通过紫外-可见反射光谱(UV-Vis DRS)、透射电镜(TEM)对制备催化剂进行了表征. 利用FeSSPA-TiO2可见光(λ＞420 nm)激发活化分子氧降解有机染料罗丹明B (Rhodamine B, RhB)、无色小分子2,4-二氯苯酚(2,4-Dichlorophenol, 2,4-DCP)及水杨酸(Salicylic acid, SA), 研究了FeSSPA-TiO2的光催化性能. 结果表明, FeSSPA-TiO2光催化剂在pH 6.7, 可见光照射条件下, 80 min RhB褪色率达到100%, 20 h小分子2,4-DCP, SA的降解率分别达到67%, 100%. 在实验条件下, 33 h对RhB矿化率达到70.5%. 通过反应过程中氧化物种的测定, 发现降解过程主要涉及超氧自由基( )的氧化机理.

关键词: 席夫碱铁, TiO2, 复合物, 光催化

An iron(III) Schiff base complex, Fe(III)-bis-Schiff-base-5-sulfonate-salicylalidene-o- phenylenediamine sodium (FeSSPA), was prepared by chemical synthetic method. Immobilized heterojunction photocatalyst FeSSPA-TiO2 was synthesized by alcoholysis method of inorganic titanium salt. UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS) and transmission electron microscopy (TEM) were carried out to characterize the catalysts. The photocatalytic degradation of Rhodamine B (RhB), 2,4-dichlorophenol (2,4-DCP), salicylic acid (SA) under the visible light irradiation and neutral condition (at pH 6.7) were used as probe reactions to evaluate the photocatalytic activities of FeSSPA-TiO2. Under the optimal conditions, RhB was decolored completely in 80 min and DCP, SA removed more than 67%, 100% in 20 h respectively. The mineralized rate of RhB was 70.5% in 33 h. ESR results showed that the highly reactive oxygen species / was produced in the reaction.

Key words: iron(III) Schiff-base, TiO2, complex, photocatalysis