▎ 摘　　要

NOVELTY - Modified heterogeneous hydrogen exfoliated graphene (mHEG)-copper/titanium dioxide nanocatalyst having particle size of 40-60 mesh, is claimed, where ratio of mHEG, copper and titanium dioxide is 1:3:2. USE - The mHEG-copper/titanium dioxide nanocatalyst is useful for conversion of carbon dioxide into methanol (claimed). ADVANTAGE - The nanocatalyst: provides easy implementation for modified hydrogen exfoliation graphene from synthesized graphene oxide with enhanced surface area; provides high yield methanol production from carbon dioxide; minimizes the difficulties arise for low yield production of methanol from carbon dioxide through the developed novel heterogeneous catalyst; minimizes the rapid rise of carbon dioxide in the environment through the photocatalytic conversion/reduction of carbon dioxide into renewable energy source e.g. methanol under solar/UV light excitation; is technically and economically proficient; does not require sophisticate instrument; provides high accuracy of optimum value relative to manual optimization process; allows less capital investment; provides economical/commercial value and develops nanocomposite material produce methanol with a high productivity; provides an optimized method of methanol production for scale-up; provides economical, environmentally safe and easiest method for the production of methanol; and provides a zero cost feed and waste to wealth concept. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) synthesizing (p1) mHEG-copper/titanium dioxide nanocatalyst, comprising (i) providing dried graphene oxide by chemical oxidation method, (ii) reducing the dried graphene oxide as provided in step (i) by hydrogen in a gas purging system in argon atmosphere at a temperature of 160-220 degrees C at a fixed hydrogen flow rate for period of 1-4 minutes to obtain mHEG, and (iii) mixing mHEG as obtained in step (ii) with titanium dioxide and copper salt in a solvent in a ratio of 1:3:2 by sol-gel method to obtain mHEG-copper/titanium dioxide nanocatalyst; and (2) conversion (p2) of carbon dioxide into methanol using mHEG-copper/titanium dioxide nanocatalyst, comprising (a) purging carbon dioxide in photo catalytic reactor containing the nanocatalyst in water to get a reaction mixture, (b) stirring the reaction mixture as obtained in step (a) for 15-20 minutes at temperature of 50-80 degrees C at a stirring speed of 150-300 rpm to obtain a reaction mixture, and (c) illuminating the reaction mixture as obtained in step (b) with UV light for 2-4 hours to obtain methanol.