| 铁(Ⅲ)—邻菲罗啉溶液体系的光化学还原——Ⅰ.溶液体系发生光化还原反应的条件、影响因素及完成程度 |
| PHOTOREDUCTION OF IRON(Ⅲ)-l, 10-PHENAN-THROLINE IN SOLUTION 1. CONDITIONS, EFFECTIVE FACTORS AND DEGREE OF FINISH OFF FOR PHOTOREDUCTION REACTION IN AQUEOUS SOLUTION |
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| 摘要: 在有过量邻菲罗啉(phen)存在的铁(Ⅲ)—phen溶液体系中,当溶液pH>1.0～1.5时(与Fe(Ⅲ)浓度有关),能够发生光化还原反应,形成配离子[Fe(phen)3]2+.导致光化还原反应的光的有效波长与溶液体系组成有关:当溶液中不含其他有机配体时,有效波长为<300nm;含有柠檬酸等有机配体时,为420～450nm;而含有乙酸时,在上述两波长范围内均可缓慢地发生光化还原反应.反应速率随照射光强度的增大而增大.太阳光、荧光高压汞灯、高压铟灯等是光化反应的有效光源.OH-、X-、PO43-等能与Fe(Ⅲ)配位的无机离子初始阶段严重抑制光化反应.除大量Co2+、Cr3+外,一般金属离子对光化反应无干扰.Fe(Ⅲ)浓度(<10μg-Fe/ml)较低时,量子产率近似与Fe(Ⅲ)浓度成正比;Fe(Ⅲ)浓度(>50μg-Fe/ml)较高时,还原反应难以完全. |
| 关键词: 铁(Ⅲ) 邻菲罗啉 光化学还原 |
| 基金项目: |
| Abstract: In the aqueous solution of Fe(Ⅲ)-l, 10-phenanthroline(hereafter referred to as"phen")with excess phen, when pH value is larger than 1.0~1.5(depending on the concentration of Fe(Ⅲ)), photoreduction to complex ion[Fe(phen)3]2+ can take place. The effective wavelengths of the light for the photoreduction depend on the composition of solution, If no organic ligands were added, the effective wavelengths would be less than 300nm. when citric acid was added, they were 420~450 nm. In the presence of acetic acid photoreduction reaction will occur slowly between 420-450 nm or less than 300nm.The rate of reaction increases with radiation strength of the light sources. Sunlight, GGY-125W high-pressure fluorescent bulb, high-pressure In-lamp et al. are suited for photoreduction. Inhibitive effects were found for some inorganic ligands, which coordinated with Fe3+, such as OH-, X-, PO43-, and so on, at starting. General metal ions don't develop inhibitive effects with the exception of a great number of Co2+, Cr3+. when the concentration of Fe(Ⅲ)is low(<10 μg-Fe/ml), the quantum yield is approximately proportional to the concentration of Fe(Ⅲ). When the concentration of Fe(Ⅲ)is large(>50μg-Fe/ml), the photoreduction reaction fall to finish degree. |
| Keywords: iron 1 10-phenanthroline photochemical reduction |
| 投稿时间：1986-04-22 |
| 摘要点击次数: 1375 |
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| 颜科,沙德仁,谭明霞.铁(Ⅲ)—邻菲罗啉溶液体系的光化学还原——Ⅰ.溶液体系发生光化还原反应的条件、影响因素及完成程度[J].无机化学学报,1987,3(2):72-79. |
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