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 

机构地区：[1]Department of Petroleum Engineering,Faculty of Engineering and Science,Curtin University,CDT 250,98009 Miri,Sarawak,Malaysia [2]Department of Chemical Engineering,Faculty of Engineering and Science,Curtin University,Miri 98009,Malaysia [3]Chemical Engineering Department,Universiti Teknologi PETRONAS,Seri Iskandar 32610,Malaysia [4]HICoE-Centre for Biofuel and Biochemical Research,Institute of Self-Sustainable Building,Universiti Teknologi PETRONAS,Seri Iskandar 32610,Malaysia [5]Department of Chemical Engineering,Lee Kong Chian Faculty of Engineering and Science,Universiti Tunku Abdul Rahman,Kajang 43000,Malaysia [6]Centre for Photonics and Advanced Materials Research,Universiti Tunku Abdul Rahman,Kajang 43000,Malaysia

出　　处：《Chinese Journal of Chemical Engineering》2021年第5期297-305,共9页中国化学工程学报（英文版）

基　　金：The authors would like to acknowledge for the financial supports given by Fundamental Research Grant Scheme (FRGS/1/2019/TK02/CURTIN/03/2) from Ministry of Higher Education (MOHE),Malaysia.

摘　　要：The rising production of produced water from oilfields had been proven to bring detrimental environmental effects.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 appropriately.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 deteriorates 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.

关 键 词：Graphene OXIDE Κ-CARRAGEENAN Adsorbents DEMULSIFICATION Composites WASTE water 

分 类 号：TB33[一般工业技术—材料科学与工程] TQ424[化学工程] X703[环境科学与工程—环境工程]