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dabaoxf1

铜虫 (小有名气)

应助: 0 (幼儿园)
金币: -32.2
散金: 49
帖子: 95
在线: 40.1小时
虫号: 2862798
注册: 2013-12-10
专业: 原子簇化学

[求助] 催化剂的稳定性实验

催化剂循环使用实验具体怎么操作？
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.
文献中一般都是这么做的，但是催化剂的量特别少，溶液的量相对较多，用磁铁分离难，这么少的量还要醇洗、水洗几次，催化剂损失严重，且易团聚失活。
请问大家具体怎么操作？催化剂的量大概控制在多少？水洗时加水量？水洗后重新分散要超声吗？超声多久？谢谢大家！

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