Lithium ion adsorbents

A lithium ion sorbent comprising:

• an organosilane-grafted lithium ion sieve, wherein the organosilane-grafted lithium ion sieve is a reaction product from an organosilane reagent of the general formula:
• R1—(CH2)n—Si—R43
• wherein R1 is a group containing vinyl functionality, R4 is either a hydrolysable alkoxy group or a methyl group, where at least one of the three R4 groups is a hydrolysable alkoxy group and n is 1-3.

A lithium ion sorbent comprising:

• an organosilane-grafted lithium ion sieve, wherein the organosilane-grafted lithium ion sieve is a reaction product from an organosilane reagent, a lithium ion sieve and a dipodal organosilane reagent, the dipodal organosilane reagent being of the general formula:
• R5—((CH2)n)2—(Si—R63)2,
• where R5 is an organic moiety containing a vinyl, aliphatic or aromatic group, R6 is a hydrolysable alkoxy group or a methyl group, where at least two of the three R6 substituent groups on each silicon atom are hydrolysable alkoxy groups, and n is 0-3 and may have one or two values depending on the symmetry of the two methylene chains.