Waste to wealth: Lightweight, mechanically strong and conductive carbon aerogels from waste tissue paper for electromagnetic shielding and CO2 adsorption

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作者：
Vazhayal, Linsha [1 ]
Wilson, Praveen [1 ]
Prabhakaran, Kuttan [1 ]
机构：
[1] Department of Chemistry, Indian Institute of Space Science and Technology (IIST), Department of Space, Government of India, Valiamala, Thiruvananthapuram,695 547, India
来源：
Chemical Engineering Journal | 2020年 / 381卷
关键词：
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. © 2019 Elsevier B.V;
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