期刊
ULTRASONICS SONOCHEMISTRY
卷 73, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2021.105519
关键词
Graphene oxide; Graphene quantum dots; Ultrasound; Sonication; NMP; Exfoliation
资金
- S&T Innovation 2025 Major Special Programme [2018B10022]
- Ningbo Natural Science Foundation Programme by Ningbo Science and Technology Bureau, China [2018A610069]
- UNNC FoSE Faculty Inspiration Grant, China
- Zhejiang Provincial Department of Science and Technology [2020E10018]
This study proposes an effective, sustainable and scalable ultrasound-assisted mechano-chemical cracking method to produce graphene oxide using miscanthus as a carbon precursor. The results show that the method can produce good quality and uniform graphene oxide, with potential for producing various graphene materials via a single-step method.
Whilst graphene materials have become increasingly popular in recent years, the followed synthesis strategies face sustainability, environmental and quality challenges. This study proposes an effective, sustainable and scalable ultrasound-assisted mechano-chemical cracking method to produce graphene oxide (GO). A typical energy crop, miscanthus, was used as a carbon precursor and pyrolysed at 1200 ?C before subjecting to edgecarboxylation via ball-milling in a CO2-induced environment. The resultant functionalised biochar was ultrasonically exfoliated in N-Methyl-2-pyrrolidone (NMP) and water to form GOs. The intermediate and endproducts were characterised via X-ray diffraction (XRD), Raman, high-resolution transmission electron microscopy (HR-TEM) and atomic force microscopy (AFM) analyses. Results show that the proposed synthesis route can produce good quality and uniform GOs (8?10% monolayer), with up to 96% of GOs having three layers or lesser when NMP is used. Ultrasonication proved to be effective in propagating the self-repulsion of negativelycharged functional groups. Moreover, small amounts of graphene quantum dots were observed, illustrating the potential of producing various graphene materials via a single-step method. Whilst this study has only investigated utilising miscanthus, the current findings are promising and could expand the potential of producing good quality graphene materials from renewable sources via green synthesis routes.
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