This invention concerns biocides possessing fungicidal and bactericidal properties which can be used in construction, medicine and other various areas of technics. A nanostructural composition of biocide is realized from nanoparticles of bentonite powders intercalated by ions of Zn2+ and ions of Ag+ and/or ions of Cu2+. The biocides according to the invention are prepared starting from bentonite poweder which is preliminarly enriched with cations of Na+, then treated with 10-20% solutions of inorganic salts of Zn (preferably zinc chloride or zinc sulfate ZnSO4), and from bentonite powders preliminarly enriched with cations of Na+ and then treated with 10-20% solutions of inorganic salts of at least one ion selected in the group consisting of Ag+ ions (preferably silver nitrate) and Cu2++ ions (preferably copper sulfate). The powders of bentonite, intercalated with the Zn2+, Ag+ and/or Cu2+ ions, are cleaned from acid anions and Na+ salts, and dispersed into nanoparticles mainly of no more than 70nm. The biocide compositions according to the invention, contain the given components in the ratios by weight hereinafter indicated: nanoparticles intercalated by ions of Ag+ : nanoparticles intercalated by ions of Zn2+as 1 : (0,2 -0,8) or nanoparticles intercalated by ions of Ag+ : nanoparticles intercalated by ions of Zn2+ : nanoparticles intercalated by ions of Cu2+ as 1 : (0,2 -0,8) : (0,2- 0,5) or nanoparticles intercalated by ions of Zn2+ : nanoparticles intercalated by ions of Cu2+ as 1 : (0,2 -0,5).La présente invention concerne des biocides possédant des propriétés fongicides et bactéricides qui peuvent être utilisés en construction, en médecine et dans divers autres domaines techniques. Une composition nanostructurale de biocide est réalisée à partir de nanoparticules de poudres de bentonite intercalées avec des ions de Zn2+ et des ions de Ag+ et/ou des ions de Cu2+. Les biocides selon linvention sont préparés à partir dune poudre de bentonite qui est préalablement
