Continuous Hydrothermal Flow Synthesis of S-Functionalised Carbon Quantum Dots for Enhanced Oil Recovery

Journal article


Baragau, I., Lu, Z., Power, P.N., Morgan, J.D, Bowen, J., Diaz, P. and Kellici, S. (2020). Continuous Hydrothermal Flow Synthesis of S-Functionalised Carbon Quantum Dots for Enhanced Oil Recovery. Chemical Engineering Journal. https://doi.org/10.1016/j.cej.2020.126631
AuthorsBaragau, I., Lu, Z., Power, P.N., Morgan, J.D, Bowen, J., Diaz, P. and Kellici, S.
Abstract

Currently, there is a paucity in the exploration and application of carbon-based nanomaterials for enhanced oil recovery. Carbon quantum dots (CQDs), 0D materials consisting of a graphitic core covered by an amorphous carbon framework, were produced from glucose and p-sulfonic acid calix[4]arene (SCX4) via Continuous Hydrothermal Flow Synthesis (CHFS), an environmentally benign synthetic approach. The S-functionalised carbon quantum dots (S-CQDs) demonstrated excellent colloidal stability in aqueous and brine solutions, low retention on sand surface, and impressive enhanced oil recovery (EOR) of 17% at very low concentrations of 0.01 wt%. The mechanisms proposed for CQDs in increasing oil sweeping efficiency involves altering the carbonate rocks wettability towards water wet, and creating temporary log-jamming, where the ultra-small particle size (1.7 ± 0.7 nm) allows S-CQDs to recover oil trapped in tight reservoirs. The synthesised S-CQDs also demonstrate photoluminescence, pH stability in the range of 3-11 and have excitation independent behaviour (300-360) with an emission peak at 433 nm.

KeywordsCarbon Dots, Continuous Hydrothermal Flow Synthesis, Glucose, Calixarenes, Biomass utilization, Enhanced Oil Recovery
Year2020
JournalChemical Engineering Journal
PublisherElsevier
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cej.2020.126631
Web address (URL)https://www.sciencedirect.com/science/article/abs/pii/S1385894720327595
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Print12 Aug 2020
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Accepted08 Aug 2020
Deposited24 Aug 2020
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