Waste to wealth: Lightweight, mechanically strong and conductive carbon aerogels from waste tissue paper for electromagnetic shielding and CO2 adsorption
| Autor: | Linsha Vazhayal, Praveen Wilson, Kuttan Prabhakaran |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering Heteroatom chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Chemical engineering chemistry Specific surface area Electromagnetic shielding Environmental Chemistry Surface modification Thermal stability 0210 nano-technology Porosity Carbon |
| Zdroj: | Chemical Engineering Journal. 381:122628 |
| ISSN: | 1385-8947 |
| Popis: | Carbon aerogels (CAs) have always shown great potential for multifunctional applications. However, simultaneous improvement of mechanical, electrical and thermal properties of CAs with low density is still a big challenge due to their structural defects, disordered microstructure, and colossal oxygen containing functional groups. Herein, a subtle approach is developed to prepare CAs from waste tissue paper (WTP) and poly(vinyl alcohol) (PVA) as the basic ingredients. The WTP-PVA CAs possessed a highly interconnected three-dimensional porous structure with low density (0.057 g cm−3), high porosity (~97%) and specific surface area (1384 m2 g−1). Albeit with low density, the resultant CA displayed superior mechanical properties (specific Young’s modulus up to 1246.8 MPa cm3 g−1) and thermal stability. Besides, they also featured high electrical conductivity (1.35 S cm−1) and low thermal conductivity (0.087 W m−1 K−1). These properties provided an opportunity for some advanced applications such as electromagnetic interference (EMI) shielding and CO2 gas capture. The highest shielding effectiveness (SE), specific SE and thickness-averaged specific SE of WTP-PVA in the X-band are 40 dB, 700 dB cm3 g−1 and 1818 dB cm2 g−1 respectively, with an absorption-dominant shielding mechanism. More importantly, the WTP-PVA CA with abundant ultramicropores showed great potential for CO2 adsorption (5.14 mmol g−1 at 0 °C) with good selectivity and regeneration capability even without the aid of any chemical activation, functionalization or heteroatom doping. |
| Databáze: | OpenAIRE |
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