Alcohol dehydration performance of pervaporation composite membranes with reduced graphene oxide and graphene quantum dots homostructured filler
| Autor: | Wei-Song Hung, Shu-Hsien Huang, Chien-Chieh Hu, Bonifacio T. Doma, Ma. Elizabeth Bismonte, Rumwald Leo G. Lecaros, Hui-An Tsai, Juin-Yih Lai, Kueir-Rarn Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanocomposite Graphene Oxide 02 engineering and technology General Chemistry Polymer Permeation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Crystallinity Membrane chemistry Chemical engineering law General Materials Science Pervaporation 0210 nano-technology |
| Zdroj: | Carbon. 162:318-327 |
| ISSN: | 0008-6223 |
| Popis: | Graphene quantum dots(GQDs) were used to possibly cover the structural defects on the graphitic regions of reduced graphene oxide(rGO). The resulting homostructure nanocomposite fillers(rGO + GQD) were incorporated in an alginate solution creating a dense composite membrane for pervaporation. The membranes were applied to separate alcohol/water mixtures in which the successful covering of structural defects was observed with good separation performance of lower molecular weight alcohols. The Raman spectra and elemental analyses confirmed the successful changes on the physical and chemical structures of the homostructured fillers. The X-ray diffraction pattern showed that the crystallinity of the membrane was greatly affected when incorporated with rGO + GQD. The alginate incorporated with 3 wt% of rGO + GQD(Alg-rGO + GQD) has the best pervaporation performance in separating methanol/water mixture with a permeation flux of 2323 g m−2 h−1 and water concentration in permeate of 92.7% at 70 °C. While the positron annihilation lifetime spectroscopy results supported that the minimization of the structural defects enhanced the water selectivity of the membrane by easy transport of water molecules through the free volume spaces and blocks methanol molecules. The results in this study may provide the possible sealing or curing the defects on rGO with GQDs and improve the interfacial interaction with the polymer matrix. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect