The effect of ZnCl₂ activation on microwave absorbing performance in walnut shell-derived nano-porous carbon

Abstract

Porous carbon has been expected to be a potential candidate as a lightweight and efficient microwave absorber.

Broadband microwave absorber constructed by reduced graphene oxide/La0.7Sr0.3MnO3 composites

“…It is worth noting that microwave absorption peaks shied toward the low frequency regions as the thickness of the absorber increased from 1.5 to 5.5 mm. This phenomenon can be explained by the 1/4 wavelength equation: 42,43…”

Porous carbon materials for microwave absorption

“…Porous materials could be regarded as a composite composed of the solid component and air component, where Maxwell Garnett (MG) theory is a symbolic mechanism for exploring the variation of the effective permittivity. 57,66,67 MG theory can be expressed as:…”

“…2a, a wide range of biomass (walnut shell, spinach stems, rice husk, waste cotton, shell of pumpkin seeds, loofah sponge, jute, chiffon cake, chicken feathers, fish skin and fir wood) has been utilized to fabricate PCs through direct carbonization processes or activation methods. 66,67,[71][72][73][74][75][76][77][78] The resultant pore structures of the PCs are related to the texture of the biomass, carbonization conditions, or activation conditions.…”

Porous carbon material derived from fungal hyphae and its application for the removal of dye

“…In addition, the treatment of biomass adsorbents is more energy efficient than the preparation of biomass carbon (microwave pyrolysis, hydrothermal synthesis, and high-temperature pyrolysis). [2][3][4][5][6] But in terms of this material (fungal hyphae, Irpex lacteus), PCFH is better than FH (Table S2 †). Aer carbonization-activation treatment, PCFH has a large specic surface area and higher porosity than FH, which can improve the adsorption capacity to RhB by providing more adsorption sites.…”

“…Biomass carbon is a carbon-rich product which is derived from biomass via high temperature pyrolysis (without oxygen or with limited oxygen content). 1 Recently, it has become a research hotspot [2][3][4][5][6] due to its unique advantages (huge specic surface area and abundant functional groups, etc.) and wide applications 7,8 (catalysts, adsorbents, separation materials, gas and energy storage materials, electrochemical materials, etc.).…”