Continuous hydrothermal flow synthesis of S-functionalised carbon quantum dots for enhanced oil recovery
| Autor: | David J. Morgan, Pedro Diaz, Zhen Lu, Nicholas P. Power, Ioan-Alexandru Baragau, Suela Kellici, James Bowen |
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| Rok vydání: | 2021 |
| Předmět: |
Aqueous solution
Materials science Dopant General Chemical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Carbon Dots Continuous Hydrothermal Flow Synthesis Glucose Calixarenes Biomass utilization Enhanced Oil Recovery Industrial and Manufacturing Engineering Hydrothermal circulation 0104 chemical sciences Amorphous solid Nanomaterials Chemical engineering Amorphous carbon Environmental Chemistry Particle size Enhanced oil recovery 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 405:126631 |
| ISSN: | 1385-8947 |
| Popis: | 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 +/- a dopant molecule (p-sulfonic acid calix [4] arenes) via Continuous Hydrothermal Flow Synthesis (CHFS), an environmentally benign synthetic approach. The sulphur-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 with an emission peak at 433 nm, indicative of the nature and diversity of functional groups in the amorphous surface of the S-CQDs. |
| Databáze: | OpenAIRE |
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