The growing demand for nano-structured composite materials and sustainable processes for next generation CO2 capture technologies has necessitated the need to develop novel and cost-effective synthetic routes for solid CO2 adsorbents based on hypercross-linked polymers (HCPs) and reduced graphene oxide (RGO) microporous sorbent materials with improved physico-chemical properties. The most important selection is modification of the synthesized microporous sorbent materials by the incorporation of RGO, giving rise to composite materials that combine the properties of both. These hybrid materials will be of great potential for carbon capture and storage (CCS) applications, especially for post-combustion CO2 capture, owing to the increase in CO2 capturing efficiency and selectivity to CO2 compared to other flue gases. Herein, we report a facile and effective approach for fabrication of HCPs-supported reduced graphene oxide composites. The microporous HCPs was synthesized using 4,4′-bis(chloromethyl)-1,1′-biphenyl monomer by Friedel–Crafts alkylation. The RGO was prepared by modified Hammers method. The as-synthesized composites were characterized by TEM, SEM, FTIR, TGA and N2 adsorption–desorption isotherm. The HCP/RGO composite showed maximum CO2 adsorption of 5.1 wt% than the HCPs alone at 40 °C and 1 atm.

Abstract
    1 Introduction
    2 Experimental
        2.1 Materials
        2.2 Synthesis of hypercross-linker polymers of 4,4′-Bis(chloromethyl)-1,1′-biphenyl
        2.3 Reduced graphene oxide (RGO)
        2.4 Fabrication of composite, HCPRGO
        2.5 Physicochemical characterization
            2.5.1 N2 adsorption desorption isotherm (BET)
            2.5.2 X-ray diffraction pattern (XRD)
            2.5.3 Thermogravimetric analysis (TGA)
            2.5.4 Fourier transform infrared spectroscopy (FT-IR)
            2.5.5 Scanning electron microscopy (SEM)
            2.5.6 Transmission electron microscopy (TEM)
        2.6 CO2 adsorption
    3 Results and discussion
    4 Conclusions
    Acknowledgements 
    References

• Rajangam Vinodh(Department of Chemical Engineering, Hanseo University/Korea Carbon Capture and Sequestration R&D Centre/School of Electrical and Computer Engineering, Pusan National University)
• Cadiam Mohan Babu(Department of Chemical Engineering, Hanseo University/Korea Carbon Capture and Sequestration R&D Centre)
• Aziz Abidov(Department of Chemical Engineering, Hanseo University/Korea Carbon Capture and Sequestration R&D Centre)
• Muthiahpillai Palanichamy(Department of Chemical Engineering, Hanseo University/Korea Carbon Capture and Sequestration R&D Centre)
• Wang Seog Cha(Korea Carbon Capture and Sequestration R&D Centre/School of Civil and Environmental Engineering, Kunsan National University)
• Hyun Tae Jang(Department of Chemical Engineering, Hanseo University/Korea Carbon Capture and Sequestration R&D Centre)