▎ 摘　　要

NOVELTY - Composite material comprises graphene phase carbon nitride nano-sheets loaded with tin oxide nano-spheres or thin layered graphene phase-carbon nitride nano-sheets loaded with tin oxide nano-spheres. USE - The composite material is useful in sensitive, selective detection of volatile organic pollutants (including methanol, n-decane, butyl acetate, ethanol, acetone, toluene, o-xylene, benzene, chlorobenzene, aniline, n-butanol, ethylbenzene, m-xylene, p-xylene, 2-chloroethanol, tetrachlorethylene, isoprene, n-heptane, diethyl ether, trichlorethylene, ethyl acetate, octanal, formaldehyde, propionaldehyde, butyraldehyde, pentanal, hexanal, heptaldehyde, octanal, propylene oxide or dichloromethane, where volatile organic pollutants are capable of forming hydrogen bonds, and temperature of gas-sensitive selective test is 20-600 degrees C) at room temperature (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing composite material comprising (i) dispersing graphene phase carbon nitride or thin layered graphene phase carbon nitride in ethanol, adding stannous chloride, stirring, then adding hydrochloric acid and sodium hypochlorite, stirring at 100-180 degrees C for 12-36 hours, cooling the mixture to room temperature, and then washing with deionized water and absolute ethanol, and (ii) drying step (i) obtained product, heating to 400-600 degrees C, and then roasting at constant temperature for 1-4 hours to obtain final product; and (2) use of composite material in sensitive, selective detection of volatile organic pollutants.