海水中铁(Ⅲ)-氨基酸盐配合物的光化学反应研究

杨桂朋; 赵润德; 陆小兰; 高先池

海水中铁(Ⅲ)-氨基酸盐配合物的光化学反应研究

1.
中国海洋大学, 化学化工学院, 山东, 青岛, 266003
2.
青岛市环境保护局, 山东, 青岛, 266003

基金项目: 国家自然科学基金资助项目(40176023);教育部科学技术研究重点资助项目(105105)

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出版历程
- 收稿日期: 2004-12-03
- 修回日期: 2005-04-08

Study on photoreaction of Fe³⁺-amino acid complex in seawater

1.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China
2.
Qingdao Environmental Protection Bureau, Qingdao 266003, China

摘要

摘要: 系统研究了高压汞灯模拟日光照射下铁(Ⅲ)-氨基酸盐配合物在天然海水中的光化学反应情况,结果发现,在氨基酸盐配体的存在下,铁(Ⅲ)会发生光化学反应生成还原态的铁(Ⅱ),同时生成的铁(Ⅱ)会被容器内的氧再氧化为铁(Ⅲ).铁(Ⅲ)的光还原反应速率会受到配体浓度、pH和光强以及温度的影响.在氨基酸与铁(Ⅲ)浓度配比大于2的情况下,在铁(Ⅲ)氨基酸盐配合物的光还原反应初期铁(Ⅱ)浓度的增长符合一级动力学反应规律,100min后浓度趋于稳定.光强升高和pH降低都能加快光还原速率,而改变温度则基本上对光还原反应速率无影响,这证明铁(Ⅲ)的光还原反应为一自由基引发的电子转移过程.
- 铁 /
- 氨基酸 /
- 光化学反应 /
- 海水
Abstract: Study on the photochemical reaction of Fe³⁺-amino acid complex in seawater was conducted under high pressure lamp.In the presence of amino acid,the photoreduction rate constant of Fe³⁺ is affected by the amino acid concentration,pH,light intensity and temperature.When the proportion of amino acid and Fe³⁺ is above 2,the photoreduction reaction of Fe³⁺ at the early stage exhibits a first-order reaction kinetic pattern,but remains nearly stable after 100 min.High light irradiation and low pH value can enhance the photo reduction rate.On the contrary,the temperature has almost no effect on the photor eduction rate.It is proved that the process of photo reduction of Fe³⁺ is a ligand-to-metal charge transfer process stimulated by free radicals.
- iron /
- amino acid /
- photochemical reaction /
- seawater

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参考文献(18)

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