Method for adsorbing and separating heavy metal elements by...

Details Method for adsorbing and separating heavy metal elements by... Method for adsorbing and separating heavy metal elements by...

C - Chemistry, Metallurgy

02

F

C02F 1/42 (2006.01) B01D 15/00 (2006.01) C02F 1/62 (2006.01) G21F 9/12 (2006.01)

Patent

CA 2075790

A method of adsorbing and separating a heavy metal element by using an insoluble tannin or a gelled tannin adsorbent comprising: (a) adjusting the pH of a solution containing a plurality of heavy metal elements to a predetermined pH; (b) contacting the adsorbent with the solution in which the pH thereof is adjusted; (c) adjusting the pH of the solution contacted with the adsorbent to a pH different from the predetermined pH of step (a); and (d) contacting the solution in which the pH thereof is adjusted at step (c) with the adsorbent prepared at step (b). According to the inventive method, all of the heavy metal elements can be efficiently separated and adsorbed by using a tannin adsorbent from a solution containing a number of heavy metal elements. A method of regenerating a tannin adsorbent is also disclosed.

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