Abstract: The invention relates to a material in the form of a cellular solid monolith consisting of an inorganic oxide polymer. Said monolith comprises macropores which have an average size dA of 4 ?m to 50 ?m, mesopores that have an average size dE of 20 to 30 ?, and micropores which have an average size d1 of 5 à 10 ?, said pores being interconnected. The inorganic oxide polymer has organic groups R of formula —(CH2)n—R1, wherein 0?n?5, and R1 is selected from among a thiol group, a pyrrole group, an amino group having one or more optional, optionally substituted alkyl, alkylamino, or aryl substituents, an alkyl group, or a phenyl group optionally having an alkyl-type substituent R2. The disclosed material can be used as a substrate for a metal catalyst and for decontaminating liquid or gaseous media.