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dabaoxf1銅蟲 (小有名氣)
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[求助]
催化劑的穩(wěn)定性實驗
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催化劑循環(huán)使用實驗具體怎么操作? A total of 0.10 mL of aqueous 4-NP solution (0.005 M) was mixed with 1.0 mL of fresh NaBH4 (0.2 M) solution. Subsequently, 1.0 mL of aqueous dispersion of the Fe3O4@SiO2- Au@mSiO2 microspheres (0.3 wt %) was added, and solution was quickly subjected to UV-vis measurements; To study the reusability of the magnetic catalysts, the used magnetic microspheres were separated from the solution with a magnet after the monitoring whole reduction process was com- pleted. The recycled magnetic microspheres were washed with ethanol 6 times and with deionized water 3 times. Similar to the above reduction process, the obtained magnetic microspheres were redispersed with 1.0 mL of deionized water and mixed with 0.1 mL of aqueous 4-NP solution (0.005 M) and 1.0 mL of fresh NaBH4 (0.2 M) solution. After reaction for 20 min, the solution was measured using UV-vis spectroscopy. 文獻中一般都是這么做的,但是催化劑的量特別少,溶液的量相對較多,用磁鐵分離難,這么少的量還要醇洗、水洗幾次,催化劑損失嚴重,且易團聚失活。 請問大家具體怎么操作?催化劑的量大概控制在多少?水洗時加水量?水洗后重新分散要超聲嗎?超聲多久?謝謝大家! |
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