Adsorption equilibrium has the following forms:
1, slow, the adsorption rate and adsorption capacity decreased, and the adsorption curve was smooth;
2. It is true that the adsorption rate and adsorption capacity decrease and suddenly increase after reaching a certain stable state, which can be found in some literatures;
3. The adsorption rate and adsorption capacity decrease. After reaching a certain stable state, the adsorption curve suddenly begins to decrease, that is, desorption exceeds adsorption. This is a common situation, and it is also a method to judge whether some papers are fraudulent.
At present, the adsorption equilibrium time of most papers is less than 12h, mainly because most of them are mainly adsorbed by heavy metals, and the adsorption speed is really fast and the adsorption effect is good, but it is difficult for some organic substances to reach equilibrium in a short time. Ajiang 269 (contact TA in the station) to see the concentration change. If there is color, you can determine the stability! There is also a Langmuir equation that can determine the time! 1lisj208 (in-sTAtion contact ta) Use excel to make a curve. When it becomes a straight line, the adsorption will be balanced. I'm also doing the experiment of adsorbing LisJ208 (Station Contact TA), which was first conducted by Vaughan on September 9-1018:15, 2009:
The determination of adsorption equilibrium time is determined by the relationship between adsorption rate and time through experiments.
It should be determined by the relative magnitude of adsorption and desorption rates and the change of apparent adsorption capacity.
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Almost all adsorption literatures at home and abroad since 1992, especially SCI, have been collected and roughly read. For example, Elesevier and springer can collect less than 50% (one of hundreds of thousands of articles such as elsevier and ACS ACS is searched by adsorption or adsorption), and most of the recent adsorption-related English books (after 1995) are collected, whether bought from abroad or borrowed from the library.
Adsorption is a big field, and I am just a primary school student, making progress slowly. Vaughan (station contact TA) is roughly in a straight line, so the adsorption is relatively balanced.
This is not right. Many people think so. Generally, it will change when it is almost in a straight line. The reason why it has not changed is that the adsorption experiment time is not long enough, and it will take more than 24 hours to start judging.