The chemical and thermal stability of the sulfide- functionalized (R-S-R' type) sorbents based on mesostructured mesoporous silicate SBA-15 have been investigated by physico-chemical methods. It’s found that the treatment of the material in acid, neutral and alkaline conditions under boiling temperature lead to insignificant changes in structural, textural and sorption characteristics, showing total losses of about 20%. The grafted functional layer is saved. The sorbents obtained are able to work over a long period of time in a variety of technological solutions and are not inferior to well-known commercial sorbents with functional groups.