The short answer is "yes". However, a more complete answer needs to consider the purpose for which such treatment is intended to prepare the sponges in question. Due to the
…porous nature of sponges, UV treatment is NOT sufficient to completely destroy bacteria and other infectious agents subject to UV light effects. However, UV as a supplemental element of infection control is generally considered to be useful. (In the case of sponges or other porous material, a combination of heat & chemical agents may be necessary - and for most medical purposes, natural sponges should NOT be considered acceptable for sterile purposes even after such treatment [unless autoclaved and tested?].) (MORE)