How Does Adsorption Works?
How Does Adsorption Works?
(OP)
Guys,
Activated Carbon, Silica gel, and/or Molecular sieve are just some of the materials that adsorb compounds/chemicals which passes through it. Any idea how this works microscopically?
Activated Carbon, Silica gel, and/or Molecular sieve are just some of the materials that adsorb compounds/chemicals which passes through it. Any idea how this works microscopically?





RE: How Does Adsorption Works?
So far all I can tell you is that there are two types of ADsorption: solvent-motivated, which is entropy driven (eg. hydrocarbons, which are usually hydrophobic, with water - there is expulsion of the solute from one phase and accumulation at the interface of the phase); and sorbent-motivated, which is enthalpy driven (eg. activated carbon and benzene, where the activated carbon surface is attractive to benzene).
More after Tuesday. If you can't wait that long, check out this PowerPoint presentation I cound on Google.
RE: How Does Adsorption Works?
Gary Schreiber, CWS VI
The Purolite Co.
RE: How Does Adsorption Works?
Does Cation and Anion Exchangers in Water Conditiong Process not of adsorption type? Instead, of absorption?
gladkenn
RE: How Does Adsorption Works?
RE: How Does Adsorption Works?
There are some adsorbent resins that only work on the basis of adsorption and some that work on the basis of ion exchange and adsorption.
In general, cation and anion exchange resins are used on the basis of the chemical reaction. In special cases, ion exchange resin manufacturers also manufacture adsorbents that look like ion exchange resins and some adsorbents that also have ion exchange functionality.
Some ion exchange resins, particularly the macroporous or macroreticular versions, used in general water treatment also will have some adsorption capability.
Gary Schreiber, CWS VI
The Purolite Co.
RE: How Does Adsorption Works?
Adsorption is a means of separating several different kinds of compounds, but the filter itself does not form a chemical bond. It is the principal on which all chromatography works.
In the case of aBsortion there is a physical trapping of the molecule whose retention is desired by formation of some sort of chemical interaction such as ionic bonding.
I always had a hard time remembering which was which when I was learning them so I came up with "aDsorption as in aDhering" which is in effect what happens, whereas absorbing means they are trapped completely like water is aBsorbed by a sponge.