What are the method in purifying colloids?

Answer 1

One way to prepare colloids is dispersion of large particles, which is done by mixing or shaking. Another way to prepare colloids is by condensation of dissolved molecules into larger particles by processes that include redox reactions or precipitation.

Answer 2

A method of preparing colloidal sols of pentavalent antimony containing increased amounts of metal is described. More particularly, a method of converting substantially water-insoluble metal antimonates to colloidal sols of pentavalent antimony is described. The method comprises mixing a substantially water-insoluble metal antimonate with a pentavalent antimony sol and agitating the mixture for a period of time sufficient to convert at least a portion of the crystalline metal antimonate to the colloidal state. The colloidal sols obtained in the described manner contain an increased amount of the metal, and such sols are useful as flame-retardants. == I claim:

1. A process for preparing a colloidal aqueous sol of pentavalent antimony containing increased amounts of metal which comprises the steps of

(a) preparing a mixture of a substantially water-insoluble crystalline metal antimonate and an aqueous pentavalent antimony sol,

(b) agitating said mixture in the absence of cation exchange resins for a period of time sufficient to convert at least a portion of the crystalline metal antimonate to colloidal antimony, and

(c) recovering the colloidal pentavalent antimony sol containing an increased amount of metal.

2. The process of claim 1 wherein the colloidal pentavalent antimony recovered in step (c) is separated from any unconverted crystalline metal antimonate by filtration.

3. The process of claim 1 wherein the crystalline metal antimonate is sodium antimonate.

4. The process of claim 3 wherein the mole ratio of sodium to antimony in the colloidal sol recovered in step (c) is at least about 0.3:1.

5. The process of claim 1 wherein the aqueous pentavalent antimony sol used to prepare the mixture in step (a) is an aged sol.

Answer 3

Colloidal particles have ab electrical charge that will repel all other similarly charged colloidal particles. However, these charged particles will attract particles of opposite charge. Therefore, a negative colloid can be made to coagulate (begin to settle out) by adding to it positively charged particles.

Answer 4

Colloids can generally be prepared by the following methods:-

1. Chemical Methods:From chemical reactions leading to formation of molecules by double decomposition, oxidation, reduction or hydrolysis.These molecules then aggregate leading to formation of sols. Example:-

SO2 + 2H2S --------> 3S(sol) + 2 H2O [This is example of formation from oxidation]

2. From Electrical Disintegration or Bredig's Arc method.

3. Peptization :- It is the process of formation of colloid by simply shaking the dispersion medium with precipitate in presence of small electrolyte.

Answer 5

The two methods in preparing colloids are condensation method and dispersion method.

Answer 6

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Answer 7

Colliod solution can be purified by seperation process like centrifugation,evapouration,etc.