▎ 摘　　要

NOVELTY - Preparing photocatalyst composite comprises (a) preparing graphene oxide containing an oxygen-containing functional group; (b) preparing mixed solution by mixing the first carboxylic acid compound and the second carboxylic acid compound in an organic solvent; (c) preparing reactant by mixing titanium precursor with mixed solution; (d) preparing titanium-organic framework having hierarchical porous pores by reacting the reactants; and (e) preparing photocatalyst composite having graphene oxide/titanium-organic framework structure by mixing the titanium-organic framework and graphene oxide and then treating them with ultrasonic waves. The first carboxylic acid compound is amino-1,4-benzenedicarboxylic acid having electronegativity of 3-3.5. The second carboxylic acid compound is 1,4-benzenedicarboxylic acid having electronegativity of 3.6-3.9. In the step (b), the mixed solution is mixture of first carboxylic acid compound and second carboxylic acid compound in molar ratio of 3:1-1:3. USE - The method is useful in preparing photocatalyst complex for adsorption and decomposition of volatile organic compounds including toluene, aldehyde, ketone, benzene, ethylbenzene, xylene and chlorinated hydrocarbons (all claimed). ADVANTAGE - The photocatalyst composite has: excellent photocatalytic activity due to strong interaction between porous titanium-organic framework and graphene oxide; improved adsorption and decomposition efficiency of volatile organic compounds due to fast mass diffusion rate of volatile organic compounds; and customized pore structure. DETAILED DESCRIPTION - Preparing photocatalyst composite comprises (a) preparing graphene oxide containing an oxygen-containing functional group; (b) preparing mixed solution by mixing the first carboxylic acid compound and the second carboxylic acid compound in an organic solvent; (c) preparing reactant by mixing titanium precursor with the mixed solution; (d) preparing titanium-organic framework having hierarchical porous pores by reacting the reactants; and (e) preparing photocatalyst composite having a graphene oxide/titanium-organic framework structure by mixing the titanium-organic framework and graphene oxide and then treating them with ultrasonic waves. The first carboxylic acid compound is amino-1,4-benzenedicarboxylic acid having electronegativity of 3-3.5. The second carboxylic acid compound is 1,4-benzenedicarboxylic acid having electronegativity of 3.6-3.9. In the step (b), the mixed solution is mixture of the first carboxylic acid compound and the second carboxylic acid compound in molar ratio of 3:1-1:3. The hierarchical porous pores are composed of mesopores having pore size of 40-60 nm and micropores having pore size of 3-25 nm. INDEPENDENT CLAIMS are also included for: photocatalyst composite for adsorption and decomposition of volatile organic compounds, comprising graphene oxide containing oxygen-containing functional group, and titanium bonded to the graphene oxide-organic framework, where the titanium-organic framework has hierarchical porous structure in which titanium ions are coordinately bonded to mixture of the first carboxylic acid compound and the second carboxylic acid compound, and photocatalyst composite is bonded by an interaction between an oxygen-containing functional group of the graphene oxide and organic linker of the titanium-organic framework; device for adsorption and decomposition of volatile organic compounds, comprising the photocatalyst composite; and removing volatile organic compounds using photocatalyst composite, comprising (a2) preparing photocatalyst composite prepared by the method, (b2) adsorbing volatile organic compounds contained in the waste gas at concentration of 1-3000 ppm using the photocatalyst composite, and (c2) decomposing the volatile organic compound adsorbed on the photocatalyst composite by irradiating light to the photocatalyst composite adsorbed on the volatile organic compound.