▎ 摘　　要

NOVELTY - High-efficient and broad-spectrum decontaminant and disinfectant additive comprises metal oxide nanoparticles in a metallic or semi-metallic nanoparticle matrix or a graphene or graphene-derived matrix, where such metal oxide nanoparticles are titanium dioxide, zinc oxide, aluminum oxide, and cupric oxide. USE - The additive is used for adding in a product for protecting, coating or decorating soft or hard surfaces, used to remove/eliminate organic contaminants from a liquid mass in contact with hard or soft surfaces, and used for adding to an asphaltic mixture, a concrete sealing, a polymer masterbatch, among others. The additive is used to decontaminant soft or hard surfaces. The additive is used to decontaminant hard surfaces selected from indoor or outdoor hard surfaces. The additive is used to decontaminant indoor or outdoor hard surfaces selected from building walls, building coatings, furniture surface, stair railway surface or indoor or outdoor surface of houses, schools, hospitals or buildings, industrial surfaces including settling pools, inner or outer walls of industrial reactors, and polymer pieces. The additive is used to decontaminant soft surfaces selected from fabrics, plastic films or filter membranes. The additive is used as a powder 'ready-to-use', a solution to be sprayed as a liquid or a formulation to be spread on a soft or hard surface. The additive is used as a powder 'ready-to-use'. The additive is used to remove/eliminating from a soft or hard surface, contaminants selected from carbon monoxide, carbon dioxide, nitric oxide, nitrogen dioxide, sulfur dioxide, hydrogen sulfide, volatile organic compounds, methane, ammonia, formaldehyde, particulate material, lead, polycyclic aromatic compounds such as benzopyrene, benzene, xylene, trimethylbenzene and aliphatic hydrocarbons, hydrogen fluoride or hydrated hydrogen fluoride/hydrofluoric acid, methylene chloride and chlorofluorocarbons (CFCs), virus, bacteria and molds (all claimed). The additive is used for protecting, coating or decorating soft or hard surfaces, such as paints, varnishes. The additive is used to obtain a self-cleaning, decontaminant and disinfectant protecting product of surfaces, an anticorrosive, decontaminant and disinfectant protecting product of surfaces or a reduced heat dissipation, decontaminant and disinfectant protecting product of surfaces. ADVANTAGE - The additive is able to convert several types of common products used for protecting, coating or decorating soft or hard surfaces, such as paints or varnishes, into decontaminant and disinfectant products mainly based on the metal oxide nanoparticle photocatalytic properties, and then, being able of removing/eliminating contaminants from an environment around outdoor or indoor surfaces either hard or soft surfaces on which the same is applied. The additive can increase the degradation or oxidation speed and increasing the contaminant spectrum to be treated, and is high-efficient and versatile. The additive after irradiated with UV light at a wavelength of 190-380 nm, promotes a synergistic degradation and/or capture of greenhouse effect gases, or local contaminant gases around of indoor or outdoor, soft or hard, surfaces treated with a common protecting product to which the present decontaminant and disinfectant additive was added. The additive after irradiated with UV light at a wavelength of 190-380 nm, promotes a synergistic degradation and/or capture of organic contaminants suspended, or dissolved, in a mass of liquid/solution which is in contact with a soft or hard surface treated with a common protecting product to which the present decontaminant and disinfectant additive is added. Under normal humidity environments, the additive promotes an advanced oxidation process on the surface treated with a common protecting product to which the additive is added, where gaseous contaminants such as nitrous oxide, sulfur dioxide, carbon monoxide and carbon dioxide are converted into inert compounds, where a portion is absorbed by the additive and another portion is released to the environment but without representing a problem to the human health or the environment.