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jrbao銀蟲(chóng) (正式寫(xiě)手)
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[求助]
請(qǐng)教在石英比色皿中進(jìn)行對(duì)硝基苯酚催化還原反應(yīng)的問(wèn)題
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很多文獻(xiàn)在進(jìn)行對(duì)硝基苯酚催化還原反應(yīng)時(shí)，經(jīng)常使用石英比色皿，請(qǐng)問(wèn)在石英比色皿中如何攪拌？特別是對(duì)于有磁性的催化劑。另外一般在20℃下進(jìn)行，需要水浴嗎？請(qǐng)大家不吝賜教！附一篇文獻(xiàn)中的催化性能測(cè)試 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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jrbao
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