Synthesis Of The Metal Oxide Nanoparticles /Graphene Hybrid Materials And Its Application On The Catalytic Reaction And Water Treatment

Grapnene possesses a series of unique reaures, such as two-dimensionar nanosheet morphology, good electrical conductivity and large surface area, all of which make the graphene full of promise to be a novel carrier material. Significantly different from conventional materials, graphene can improve activity in lithium ion batteries, fuel cells, methanol oxidation, photocatalytic, traditional oil and chemical catalysis and water treatment when it is used as catalyst carrier. In the present work,the hybrid materials that metal oxide nanoparticles (NPs)supported graphene were synthesized, and the preparation course was explored to obtain the highly dispersed metal oxide graphene hybrid materials for high temperature catalytic reaction. The morphology effect of hybrid materials on the redox properties and hydrogenation/dehydrogenation catalytic performance, and the synergistic effect between metal oxide nanoparticles and graphene on the water treatment were discussed.1. Highly dispersed NiO/graphene hybrid materials with the size of about 3?4 nm NPs and the high specific surface area of 244.2 m2 g-1 are synthesized by using reduced graphene oxide (RGO) as template. The unique two-dimensional of graphene plays a crucial role in keeping the Ni species with a nanosheet morphology during the hydrothermal process. The superior catalytic performance of the hybrid material in benzene hydrogenation can be attributed to its high specific surface area offered by the unique two-dimensional hierarchical structure and the strong interactions between their steadily dispersed NiO NPs and RGO.2. Highly dispersed layered CeO2/graphene hybrid materials are synthesized by using acrylamide (AM) as complex precipitant for high temperature EB dehydrogenation reaction. As complex precipitant, AM plays a crucial role in the formation of the highly dispersed and layered hybrid material. The CeO2/graphene hybrid material prepared by the molar ratio Ce:AM of 1:5 display the superior catalytic performance of EB dehydrogenation in the atmosphere of Ar and CO2. The enhanced activity is attributed to larger active surface offered by the unique two-dimensional layered structure and their steadily dispersed nanoparticles obtained by adding of enough AM. In addition, the higher catalytic activity exhibited by the hybrid materials in CO2 also provides a promising choice for the usage of greenhouse gases environmentally friendly.3. Highly dispersed Ce-Fe bimetallic oxides /graphene hybrid materials with the size of about 1?2 nm NPs and the high specific surface area of 322 m2 g-1 are synthesized by using RGO. The small particle size is due to the inhibition of different species on crystal growth and the high specific surface area is due to the monolayer dispersive action of reduced graphene. The obtained Ce-Fe/RGO hybrid material exhibits the superior adsorption ability for Congo red (CR) in water. Research result suggests that the driving force for the adsorption is the electrostatic action between adsorbent materials with positive electricity and CR with negative electricity. The Fe doping modifies the electronegativity of adsorbent materials and makes the CR molecule was firmly adsorbed on the hybrid material by the bidirectional force. The new hybrid material displays the high adsorption capacity of 179.5 mg g-1 for the CR in water, suggesting the potential use of Ce-Fe/RGO hybrid materials in water treatment.