Yes, SORBENTS is a Scrabble word!

Letter values in Scrabble US: S 1, O 1, R 1, B 3, E 1, N 1, T 1, S 1.

Is it a valid word?

SORBENTS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a material that sorbs another substance; i.e. that has the capacity or tendency to take it up by either absorption or adsorption

Also: sorbent material.