Encapsulation and controlled release of isothiazolinones in zeolite NaY (FAU)

NaY zeolite, an ordered, large pore molecular sieve pertaining to the FAU zeolite structural group, was studied as a novel matrix for efficient preparation of supported isothiazolinone-based biocide, and results were compared those corresponding mesoporous silicas. To analyze possibility reducing biocide ecotoxicity by encapsulation, commercial used latex preservation (CMIT/MIT) incorporated in structure using two different methodologies: equilibrium adsorption (Zeo/Bio sample) impregnation total wetting (Zeo/Impreg sample). In release tests, despite difference initial amount released, shape curve is nearly same both methods. Microbiological tests against fungi bacteria performed. The obtained previously ordered silica SBA-15 foam MCF matrices (mesoporous/biocide samples named SBA-15/Bio, SBA-15/Impreg MCF/Bio MCF/Impreg respectively). For Staphylococcus aureus from agar well diffusion assay shows that inhibition zone about 64 mm Zeo/Impreg 55 Zeo/Bio. As regards all other materials, does not exceed 46 mm. case Escherichia coli, Zeo/Bio have 43 37 mm, respectively. No one materials larger than 30 showed greater (47 versus Chaetomium globosum 53 Alternaria alternata, respectively) impregnated with biocide.