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jrbao银虫 (正式写手)
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[求助]
请教在石英比色皿中进行对硝基苯酚催化还原反应的问题
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很多文献在进行对硝基苯酚催化还原反应时，经常使用石英比色皿，请问在石英比色皿中如何搅拌？特别是对于有磁性的催化剂。另外一般在20℃下进行，需要水浴吗？请大家不吝赐教！附一篇文献中的催化性能测试 Catalytic activity towards 4-nitrophenol reduction：To test the catalytic activity of the NCMSS（Ni@SiO2), the reduction of 4-nitrophenol by an excess of NaBH4 as the model reaction in water was chosen. The catalytic redox reaction process was set up in a standard quartz cuvette with 1 cm path length and 4 mL volume. Initially, freshly prepared NaBH4 aqueous solution (0.3 mL, 0.2 M) was added to the above quartz cuvette containing 4-nitrophenol (3 mL, 0.1 mM) with stirring at 20 ℃, and the solution color immediately changed from light yellow to yellow– green. After stirring for 2 min, a given amount of NCMSS was added to the above solution. A Shimadzu UV2550 spectrophotometer over a scanning range of 200–500 nm was employed to monitor the reaction at 20 ℃. The rate constant of the reaction was measured by the extinction of the solution at 400 nm as a function of time. |
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2楼2012-12-14 12:10:11
jrbao
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3楼2012-12-14 20:54:20