Hydrophobic, blocky silica-reduced graphene oxide hybrid sponges as highly efficient and recyclable sorbents
| Autor: | Yilin Zhu, Xiangwen Wu, Xun Zhao, Yatong Sun, Yingzi Wang, Songfang Zhao, Duxia Cao, Zhipeng Li |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Silicon Oxide General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Thermal treatment 010402 general chemistry 01 natural sciences law.invention Contact angle chemistry.chemical_compound Adsorption law Specific surface area biology Graphene Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics biology.organism_classification 0104 chemical sciences Surfaces Coatings and Films Sponge chemistry Chemical engineering 0210 nano-technology |
| Zdroj: | Applied Surface Science. 486:303-311 |
| ISSN: | 0169-4332 |
| Popis: | Silica aerogels are prone to be destroyed due to their brittleness and low mechanical properties, which limits their applications. To break the unfavorable situation, we presented a scalable and facile approach to assemble blocky silica-reduced graphene oxide (SiO2-rGO) hybrid sponges by atmospheric pressure drying technique. Briefly, ungelled silica solution from two-step sol-gel of tetraethoxysilane (TEOS), was incorporated into compressible graphene sponge (CGS). Different silicon concentration ratios had great influence on the performance of hybrid sponges. When VTEOS: Vethanol was fixed at 1:15, the sample had good flexibility and could absorb 8.5–10.2 times its own mass of solvents, but the adsorption efficiency slightly decreased with the increase of the number of experiments. When VTEOS: Vethanol was fixed at 4:7, the SiO2-rGO hybrid sponges exhibited unbroken shape, low volume shrinkage (24%), large specific surface area (803.351 m2/g), and high mass retention (83.64%) at 790 °C of thermal treatment. Moreover, they could support approximately 146 times their weight without structural damage, and possess excellent hydrophobicity with 129 ± 1° of water contact angle. These superior properties enable SiO2-rGO hybrid sponges to exhibit highly efficient absorption of oils and toxic solvents, to be regenerated (10 times) with the full release of adsorbates by heat treatment. |
| Databáze: | OpenAIRE |
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