Optimization and evaluation of reduced graphene oxide hydrogel composite as a demulsifier for heavy crude oil-in-water emulsion

• 作者: Kin Kit Fong Inn Shi Tan Henry Chee Yew Foo Man Kee Lam Adrian Chiong Yuh Tiong Steven Lim
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Resources and Environmental Technology
• 页码范围: 297-305
• 页数: 9页
• 语种: 英文

摘要

The rising production of produced water from oilfields had been proven to bring detrimental environmental ef-fects. In this study, an efficient, recyclable, and environmental-friendly reduced graphene oxide immobilizedκ-Carrageenan hydrogel composite (κCaGO) was fabricated as an alternative sorbent for crude oil-in-water demulsification. Polyethyleneimine (PEI) was employed to form a stable hydrogel composite. The conditions for the immobilization of graphene oxide (GO) on PEI-modifiedκ-Carrageenan (κC) beads were optimized ap-propriately. An immobilization yield of 77％was attained at 2％PEI, 2 h immobilization activation time, and pH 6.5. Moreover, the synthesizedκCaGO is capable of demulsification with an average demulsification efficiency of 70％. It was found that the demulsification efficiency increases with salinity andκCaGO dosage, and it deterio-rates under alkaline condition. These phenomena can be attributed to the interfacial interactions betweenκCaGO and the emulsion. Furthermore, theκCaGO can be recycled to use for up to six cycles without significant leaching and degradation. As such, the synthesizedκCaGO could be further developed as a potential sorbent substitute for the separation of crude oil from produced water.