Complexation of iron by salicylic acid and its effect on atrazine photodegradation in aqueous solution  

作　　者：Xiaoxia OU Chong WANG Fengjie ZHANG Xie QUAN Yan MA He LIU 

机构地区：[1]College of Life Science,Dalian Nationalities University,Dalian 116600,China [2]Key Laboratory of Industrial Ecology and Environmental Engineering,Ministry of Education,Dalian University of Technology,Dalian 116024,China

出　　处：《Frontiers of Environmental Science & Engineering》2010年第2期157-163,共7页环境科学与工程前沿（英文）

基　　金：the National Natural Science Foundation of China(Grant No.20907006);Doctor Initial Fund of Dalian Nationalities University,China(No.20096105)。

摘　　要：The photodegradation of atrazine and the photochemical formation of Fe(Ⅱ)and H_(2)O_(2)in aqueous solutions containing salicylic acid and Fe(Ⅲ)were studied under simulated sunlight irradiation.Atrazine photolysis followed first-order reaction kinetics,and the rate constant(k)corresponding to the solution of Fe(Ⅲ)-salicylic acid complex(Fe(Ⅲ)-SA)was only 0.0153 h^(–1),roughly one eighth of the k observed in the Fe(Ⅲ)alone solution(0.115 h^(–1)).Compared with Fe(Ⅲ)solution,the presence of salicylic acid significantly enhanced the formation of Fe(Ⅱ)but greatly decreased H_(2)O_(2)generation,and their subsequent product,hydroxyl radical(%OH),was much less,accounting for the low rate of atrazine photodegradation in Fe(Ⅲ)-SA solution.The interaction of Fe(Ⅲ)with salicylic acid was analyzed using Fourier-transform infrared(FTIR)spectroscopy and UV-visible absorption,indicating that Fe(Ⅲ)-salicylic acid complex could be formed by ligand exchange between the hydrogen ions in salicylic acid and Fe(Ⅲ)ions.

关 键 词：salicylic acid IRON ATRAZINE PHOTODEGRADATION 

分 类 号：O63[理学—高分子化学]