Details
| Original language | English |
|---|---|
| Pages (from-to) | 73-81 |
| Number of pages | 9 |
| Journal | Engineering |
| Volume | 23 |
| Early online date | 21 Feb 2023 |
| Publication status | Published - Apr 2023 |
Abstract
Achieving a water–oil interface imbalance has been identified as a critical factor in the demulsification of water-in-oil emulsions. However, conventional demulsifying membranes generally break the interface balance by depending on a relatively high transmembrane pressure. Here, we present a “contact demulsification” concept to naturally and quickly achieve disruption of the water–oil interface balance. For this purpose, a novel demulsifying membrane with a high flux of the organic component has been developed via the simple vacuum assembly of zeolitic imidazolate framework-8 (ZIF-8)@reduced graphene oxide (rGO) microspheres (ZGS) on a polytetrafluoroethylene (PTFE) support, followed by immobilization processing in a polydimethylsiloxane (PDMS) crosslinking solution. Due to the micro-nano hierarchies of the ZGS, the prepared ZIF-8@rGO@PDMS/PTFE (ZGPP) membranes feature a unique superhydrophobic surface, which results in a water–oil interface imbalance when a surfactant-stabilized water-in-oil emulsion comes into contact with the membrane surface. Under a low transmembrane pressure of 0.15 bar (15 kPa), such membranes show an excellent separation efficiency (∼99.57%) and a high flux of 2254 L·m−2·h−1, even for surfactant-stabilized nanoscale water-in-toluene emulsions (with an average droplet size of 57 nm). This “contact demulsification” concept paves the way for developing next-generation demulsifying membranes for water-in-oil emulsion separation.
Keywords
- Demulsification, Oil/water separation, Superhydrophobic membrane, Water-in-oil emulsion
ASJC Scopus subject areas
- Computer Science(all)
- General Computer Science
- Environmental Science(all)
- Environmental Engineering
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- Materials Science (miscellaneous)
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- General Engineering
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In: Engineering, Vol. 23, 04.2023, p. 73-81.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Membrane Contact Demulsification
T2 - A Superhydrophobic ZIF-8@rGO Membrane for Water-in-Oil Emulsion Separation
AU - Gu, Jiahui
AU - Qu, Zhou
AU - Zhang, Xiangning
AU - Fan, Hongwei
AU - Li, Chunxi
AU - Caro, Jürgen
AU - Meng, Hong
N1 - Funding Information: This work was financially supported by the National Natural Science Foundation of China ( 51773012 ), Fundamental Research Funds for the Central Universities (buctrc202135), and China Scholarship Council Program ( 201906880031 ).
PY - 2023/4
Y1 - 2023/4
N2 - Achieving a water–oil interface imbalance has been identified as a critical factor in the demulsification of water-in-oil emulsions. However, conventional demulsifying membranes generally break the interface balance by depending on a relatively high transmembrane pressure. Here, we present a “contact demulsification” concept to naturally and quickly achieve disruption of the water–oil interface balance. For this purpose, a novel demulsifying membrane with a high flux of the organic component has been developed via the simple vacuum assembly of zeolitic imidazolate framework-8 (ZIF-8)@reduced graphene oxide (rGO) microspheres (ZGS) on a polytetrafluoroethylene (PTFE) support, followed by immobilization processing in a polydimethylsiloxane (PDMS) crosslinking solution. Due to the micro-nano hierarchies of the ZGS, the prepared ZIF-8@rGO@PDMS/PTFE (ZGPP) membranes feature a unique superhydrophobic surface, which results in a water–oil interface imbalance when a surfactant-stabilized water-in-oil emulsion comes into contact with the membrane surface. Under a low transmembrane pressure of 0.15 bar (15 kPa), such membranes show an excellent separation efficiency (∼99.57%) and a high flux of 2254 L·m−2·h−1, even for surfactant-stabilized nanoscale water-in-toluene emulsions (with an average droplet size of 57 nm). This “contact demulsification” concept paves the way for developing next-generation demulsifying membranes for water-in-oil emulsion separation.
AB - Achieving a water–oil interface imbalance has been identified as a critical factor in the demulsification of water-in-oil emulsions. However, conventional demulsifying membranes generally break the interface balance by depending on a relatively high transmembrane pressure. Here, we present a “contact demulsification” concept to naturally and quickly achieve disruption of the water–oil interface balance. For this purpose, a novel demulsifying membrane with a high flux of the organic component has been developed via the simple vacuum assembly of zeolitic imidazolate framework-8 (ZIF-8)@reduced graphene oxide (rGO) microspheres (ZGS) on a polytetrafluoroethylene (PTFE) support, followed by immobilization processing in a polydimethylsiloxane (PDMS) crosslinking solution. Due to the micro-nano hierarchies of the ZGS, the prepared ZIF-8@rGO@PDMS/PTFE (ZGPP) membranes feature a unique superhydrophobic surface, which results in a water–oil interface imbalance when a surfactant-stabilized water-in-oil emulsion comes into contact with the membrane surface. Under a low transmembrane pressure of 0.15 bar (15 kPa), such membranes show an excellent separation efficiency (∼99.57%) and a high flux of 2254 L·m−2·h−1, even for surfactant-stabilized nanoscale water-in-toluene emulsions (with an average droplet size of 57 nm). This “contact demulsification” concept paves the way for developing next-generation demulsifying membranes for water-in-oil emulsion separation.
KW - Demulsification
KW - Oil/water separation
KW - Superhydrophobic membrane
KW - Water-in-oil emulsion
UR - http://www.scopus.com/inward/record.url?scp=85151458719&partnerID=8YFLogxK
U2 - 10.1016/j.eng.2022.02.017
DO - 10.1016/j.eng.2022.02.017
M3 - Article
AN - SCOPUS:85151458719
VL - 23
SP - 73
EP - 81
JO - Engineering
JF - Engineering
SN - 2095-8099
ER -