席夫碱铁-TiO_2复合物光催化降解有毒有机污染物  

Degradation of Toxic Organic Pollutants by Iron(Ⅲ) Schiff-base/TiO_2 Complex Under Visible Irradiation

作　　者：曹婷婷[1] 罗光富[1] 邹彩琼[1] 赵小蓉[1] 李瑞萍[1] 黄应平[1] 

机构地区：[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

出　　处：《化学学报》2011年第12期1438-1444,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20877048;50979049);湖北省高校优秀中青年创新团队计划(No.T200703);湖北省自然科学基金创新群体(No.2009CDA020)资助项目

摘　　要：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(·O-2)的氧化机理.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 heterojunc-tion 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 op-timal 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 reac-tive oxygen species.O2 was produced in the reaction.-/.OOH

关 键 词：席夫碱铁 TIO2 复合物 光催化 

分 类 号：O643.32[理学—物理化学]