▎ 摘　　要

NOVELTY - Upcycling vehicle exterior waste, comprises: pyrolyzing an organic polymer-comprising waste material and titanium dioxide particles in an inert atmosphere at a temperature of 500-900 degrees C to obtain a composite comprising 10-50 wt.% reduced graphene oxide, based on total composite weight of titanium dioxide and carbon dots on the reduced graphene oxide. USE - The method is useful for upcycling vehicle exterior waste e.g. car bumpers. ADVANTAGE - The method: transforms industrial waste particularly vehicle exterior waste e.g. car bumpers into value-added carbon-based nonmaterial; and provides large-scale fabrication of graphene-based carbon nonmaterial at low cost for multipurpose applications. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) composition, comprising reduced graphene oxide sheets and/or plates, based on total composition weight of titanium dioxide particles dispersed in and/or on the reduced graphene oxide sheets and/or plates, where at least a portion of the graphene oxide is decorated with carbon dots and where the titanium dioxide particles comprise titanium dioxide in anatase phase; (2) making the composition, comprising pyrolyzing a mixture comprising titanium dioxide particles and fragments of car bumpers in an inert atmosphere and cooling to obtain the composition; and (3) decomposing at least one organic materials, comprising mixing or contacting the composition with an aqueous solution comprising organic material to form a mixture or a contact surface and irradiating the mixture or the contact surface with sunlight and/or synthetic light in a wavelength of 100-1000 nm.