Carbon Capture and Utilization by graphenes-path covered and ahead

• Published in: Journal of cleaner production Vol. 284; p. 124712
• Main Authors: Sreedhar, I., Upadhyay, Utkarsh, Roy, Pranav, Thodur, Sarmishta Madabusi, Patel, Chetan M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.02.2021
• Subjects: adsorbents; adsorption; area; Carbon capture; carbon dioxide; catalysts; Characterization; climate change; CO2 utilization; emissions; environment; fuels; Graphene; operating costs; protocols; researchers; Simulation; Synthesis; waste management; Characterization; CO2 utilization; Synthesis; Simulation; Graphene; Carbon capture
• ISSN: 0959-6526; 1879-1786
• DOI: 10.1016/j.jclepro.2020.124712

Various methods have been devised to control the ever increasing CO2 emissions in the environment, in order to prevent severe climatic changes. Among these methods, adsorption have gained much interest owing to its high efficiency and low operating costs. However, efficiency of an adsorption process is highly dependent on the adsorbent used. Therefore, many different types of solid adsorbents have been tested till date for CO2 capture, among which graphene based adsorbents have gained much attention. Owing to the low cost, high specific area and excellent stability of graphene, many researchers have used graphene and its derivatives for CO2 capture in their study. In this work, the core results of these multitudinous studies have been summarized for the reader in form of tables followed by a discussion on the observed trends and comparisons between adsorbents. The highest adsorption capacity that was observed was 0.117 mol/g for a ternary junction like membrane of Graphene/Non-compact graphene/Carbon hollow fibers. Further, beside the adsorption properties, the common protocols for graphene based materials synthesis are also summarized, which is again, in the form of a table along with discussions and comparisons and it was inferred that these materials, mostly, can be processed easily. Synthesis section is followed by yet another table-discussion combination on the common tools that are used for characterization of synthesized materials. Finally, to complete the cycle of CO2 waste management, we summarize the CO2 utilization techniques focusing on the successful studies which used graphene based catalysts for the CO2 reduction into fuels or other valuable products. The results indicated that graphene/graphene based materials can be used either as viable alternative to expensive metal-based catalysts or as a support to other catalysts which results in a boost in their performance.