A series of functional fluorinated graphene (FG) materials including urea modified FG (UFG), alkali modified FG (AFG) and hydrazine hydrate modified FG (HFG) with different fluorine contents were prepared and introduced as demulsifiers for efficient separation of oil from oil-in-water (O/W) emulsion. Their demulsification performances were evaluated by measuring oil absorbance in separated water phase. Effects of demulsifier dosage, pH of wastewater and the NaCl concentration on demulsification efficiency have been studied detailedly. The demulsification mechanism was also explored. Results showed that demulsification efficiency increased with the decrease of fluorine content of functional FG and the oil concentration in the separated water phase decreased to the lowest value when the 600 mg/L HFG was added into the wastewater. In particular, the HFG has superior demulsification performances ranging from acidic to alkaline conditions. The strong π–π interaction and electrostatic attraction between HFG and oil droplets promote the separation of oil from oily wastewater. Besides, the HFG also presents high demulsification efficiency at different concentrations of NaCl wastewater solution, suggesting the excellent salt resistance. This work indicates that the HFG is a simple and highly efficient demulsifier to separate the oil from the oily wastewater in a wide range of pH levels.

制备了一系列功能性的氟化石墨烯（FG）材料，包括尿素改性的FG（UFG），碱改性的FG（AFG）和水合肼改性的FG（HFG），它们具有不同的氟含量，并被用作破乳剂，以有效地从油中分离出油。水（O / W）乳液。通过测量分离水相中的吸油率来评估它们的破乳性能。详细研究了破乳剂用量，废水pH值和NaCl浓度对破乳效率的影响。还探讨了破乳机理。结果表明，当向废水中加入600 mg / L HFG时，随着功能性FG中氟含量的降低，破乳效率提高，分离出的水相中的油浓度降至最低。尤其是，HFG在酸性至碱性条件下均具有出色的破乳性能。HFG和油滴之间的强π-π相互作用和静电吸引作用促进了油与含油废水的分离。此外，HFG在不同浓度的NaCl废水溶液中也具有较高的破乳效率，表明其优异的耐盐性。这项工作表明，HFG是一种简单高效的破乳剂，可在很宽的pH值范围内将油与含油废水分离。HFG在不同浓度的NaCl废水溶液中也具有较高的破乳效率，这表明其具有出色的耐盐性。这项工作表明，HFG是一种简单高效的破乳剂，可在很宽的pH值范围内将油与含油废水分离。HFG在不同浓度的NaCl废水溶液中也具有较高的破乳效率，这表明其具有出色的耐盐性。这项工作表明，HFG是一种简单高效的破乳剂，可在很宽的pH值范围内将油与含油废水分离。