Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Negative emission technology aims to remove greenhouse gases such as CO2 from the atmosphere, which is an important way achieve efficient carbon reduction. The use of biochar materials adsorbents can significantly reduce cost while effectively capturing CO2. In this work, carp fish scales were used biomass raw materials, a small amount KOH was activator provide ionic active sites, and activation ion K+ uniformly introduced into material through premixed hydrothermal reaction, followed by single-step carbonization process at moderate temperature, along with acid wash, produce N self-doping, layered-structured high porosity uniform pore channels. A series hierarchical biochars dissimilar physicochemical properties prepared varying temperature. Among them, sample 700 °C (AF-700) has ultrahigh specific surface area 1371 m2 g-1, volume 0.85 cm3 showed highest adsorption performance 3.34 mmol g-1 (0 °C, 1 bar). We also fitted curves using Langmuir-Freundlich isotherm model calculated selectivity for (N2 Ar) ideal solution theory. results indicate that self-doped structure exhibits efficiency composited in economical simple way, thus holding great potential large-scale production adsorbents.

Language: Английский