Patent ID: 8771661

Claim:
An article of manufacture, comprising: a composition for removal of gaseous or odorous compounds comprising a first modified nanoparticle, the first modified nanoparticle including a first nanoparticle comprising a first positive Zeta Potential, the first nanoparticle further comprising alumina, magnesium oxide, or combinations thereof, a diameter of less than 500 nanometers, and a surface area of at least about 200 square meters/gram, the first modified nanoparticle further including at least one negatively charged metal ion complex adsorbed onto the first nanoparticle, the at least one negatively charged metal ion complex selected from the group consisting of permanganate ion, wherein the composition further comprises a second modified nanoparticle, the second modified nanoparticle including a second nanoparticle comprising a negative Zeta Potential and at least one positively charged metal ion adsorbed onto the second nanoparticle, wherein the first modified nanoparticle is capable of binding a first gaseous or odorous compound and the second modified nanoparticle is capable of binding a second gaseous compound, wherein the article of manufacture changes color as the article of manufacture becomes saturated with gaseous or odorous compounds.