(138g) Role of Nitrogen Addition to Reduced Graphene Oxide-TiO2 Nanocompostites in Enhancing CO2 Photoreduction | AIChE

(138g) Role of Nitrogen Addition to Reduced Graphene Oxide-TiO2 Nanocompostites in Enhancing CO2 Photoreduction

Authors 

Nie, Y. - Presenter, Washington University in St. Louis
Lin, L. Y., Washington University in St. Louis
Wang, W. N., Virginia Commonwealth University
Biswas, P., Washington University in St. Louis
Carbon dioxide (CO2) capture and utilization is a promising potential technology to address global climate change. Photocatalytic conversion of CO2 into hydrocarbon fuels has attracted abundant research attention in recent years. However, there have been few reports about CO2 capture and conversion on the same material so far. Addition of nitrogen has been reported to be a feasible approach to enhance materials’ CO2 capture performance. In this work, we demonstrated two ways to fabricate the nitrogen contained reduced graphene oxide (NrGO)-TiO2 nanocomposites and discussed the function of nitrogen surface modification, as well as the nitrogen structure doping. We found that both nitrogen surface modification and structure doping could enhance the CO2 photoreduction of rGO-TiO2 materials significantly.

It was demonstrated that NrGO (N surface modified rGO or N structure doped rGO) with an appropriate N quantity and N-bonding configuration acted as a dual-functional promoter, simultaneously enhancing CO2 adsorption on the catalyst surface and facilitating electron-hole separation, while eventually boosted the photocatalytic performance. Experimental results in this work provide a better understanding of the critical roles of nitrogen addition in the synthesized composites and also inspire the ongoing interest in a better design of other N-contained graphene based materials for photoreduction of CO2.

Reference:

Lin, L. Y., Nie, Y., Kavadiya, S., Soundappan, T., & Biswas, P. (2017). N-doped reduced graphene oxide promoted nano TiO2 as a bifunctional adsorbent/photocatalyst for CO2 photoreduction: Effect of N species. Chemical Engineering Journal316, 449-460.

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