This study explores the transformation of peanut shells, an abundant agricultural waste, into high-efficiency activated carbon for CO 2 capture using a two-step pyrolysis and K 2 CO 3 activation method. Observations indicated that with an increasing impregnation ratio, the activated carbon demonstrates remarkable improvements in structural properties, achieving specific surface areas and pore volumes of 1150.02 m 2 /g and 0.46 cm 3 /g, respectively. Among the prepared samples, the activated carbon obtained with a peanut shell to K 2 CO 3 impregnation mass ratio of 1:2 exhibits superior CO 2 adsorption capacity at 1 bar, with values of 3.76 mmol/g at 25 °C and 5.70 mmol/g at 0 °C. The CO 2 adsorption isotherms of the activated carbon conform to the Langmuir and Freundlich models. These results demonstrate the potential of this method in addressing environmental concerns, particularly in mitigating CO 2 emissions, and highlight the broader application prospects of biomass-derived activated carbon in environmental management.
Yating Long,Jiahui Wen,Banghui Xu,Liang Zeng,Liangdi Zhu,Mengwu Xiao,Manxia Lu,Zhian Wang,Lanqing Deng
Porous biochar materials (BC) have shown excellent performance in energy storage and water treatment adsorption. Carbonization of agricultural and forestry solid waste and fixation in the form of stable biochar to form biochar materials can achieve green "waste utilization for treatment wastewater". In this study, BC samples were generated by using Camellia oleifera shell (COS) as raw material and K 2 CO 3 as green activator in-situ pyrolysis . The adsorption behavior of COS biochar in aqueous solution was evaluated using phenol as a pollutant probe. The synergistic effect of pyrolysis temperature and K 2 CO 3 activation promoted the development of the pore structure of BC. The X-ray photoelectron spectroscopy results indicated that K 2 CO 3 activation promoted the formation of C-C defects and promoted phenol adsorption. KBC-900 exhibited superior absorption capacity for phenol (300.15 mg/g). The activation of K 2 CO 3 also promoted the adsorption of oxygen. In addition, using H 2 O 2 for regenerating biochar did not show a significant decrease in the adsorption rate after five cycles (decline rate < 5 %). The strong adsorption capacity of KBC-900 for phenol might be due to the presence of π-π interactions, hydrogen bonds , and van der Waals interactions during the adsorption process .
危险品化学品经营许可证（带存储）