Carbon quantum dots (CQDs) and polyethyleneimine (PEI) layer-by-layer (LBL) self-assembly PEK-C-based membranes with high forward osmosis performance
| Autor: | Yizhi Zhuo, Yan Hua Deng, Qian Yang, Jian Hua Chen |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Layer by layer Forward osmosis 02 engineering and technology General Chemistry Electrolyte 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Membrane Chemical engineering Carbon quantum dots Self-assembly 0210 nano-technology Layer (electronics) 0105 earth and related environmental sciences |
| Zdroj: | Chemical Engineering Research and Design. 170:423-433 |
| ISSN: | 0263-8762 |
| DOI: | 10.1016/j.cherd.2021.04.026 |
| Popis: | Forward osmosis (FO), as an emerging energy-saving membrane processes, is highly promising to solve the water-shortage problem. Herein, a series of novel carbo polyetherketone (PEK-C)-based FO membranes are prepared via layer-by-layer (LBL) self-assembly by using polyethyleneimine (PEI) as the positive layer and carbon quantum dots (CQDs) as the negative layer. By tuning the number of self-assembly layers, the characteristics of outermost electrolyte, and the concentration of CQDs solution used for self-assembly, the performance of the PEK-C-based FO membranes can be optimized. The resulting membrane, [PEI/CQDs]2PEI, exhibits best performance with a water flux of 30.8 LMH and a reverse salt flux of 8.9 GMH, respectively, outperforming most of current FO membranes. Such high performance is attributed to the presence of CQDs, which endows the membrane with more hydrophilic surface. Furthermore, the membrane presents excellent long-term stability and anti-fouling property owing to the smoother surface that results from the LBL method. Our work could provide some reference for the design of high performance membrane. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect