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2010, Volume 4, Issue 2

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Frontiers of Environmental Science & Engineering >> 2010, Volume 4, Issue 2 doi: 10.1007/s11783-010-0018-3

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

1.College of Life Science, Dalian Nationalities University, Dalian 116600, China；Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Dalian 116024, China; 2.College of Life Science, Dalian Nationalities University, Dalian 116600, China; 3.Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Dalian 116024, China;

Available online: 2010-06-05
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Abstract

The photodegradation of atrazine and the photochemical formation of Fe(II) and HO 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 () corresponding to the solution of Fe(III)-salicylic acid complex (Fe(III)-SA) was only 0.0153 h, roughly one eighth of the observed in the Fe(III) alone solution (0.115 h). Compared with Fe(III) solution, the presence of€ salicylic€ acid€ significantly€ enhanced€ the€ formation€ of Fe(II) but greatly decreased HO 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.

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