Adsorption characteristics of nitrate ion by sodium carbonate activated PAN-based activated carbon fiber
Adsorption characteristics of nitrate ion by sodium carbonate activated PAN-based activated carbon fiber
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DOI：
10.1007/s42452-022-05191-w
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发表时间：
2022-10
影响因子：
2.6
通讯作者：
Natsuho Sato;Y. Amano;M. Machida
中科院分区：
文献类型：
--
作者：
Natsuho Sato;Y. Amano;M. Machida
In this study, polyacrylonitrile (PAN)-based carbon fiber with high nitrogen content was activated at 800 °C with sodium carbonate and heat-treated at 950 °C to prepare activated carbon fiber (ACF), and the results of nitrate ion adsorption on the prepared ACF are presented. CHN elemental analysis, XPS measurement, and Boehm titration were used to determine the nitrogen content and surface functional groups of ACF. It is discussed that the total amount of nitrogen decreases, whereas quaternary nitrogen (N-Q) increases upon heat treatment. The decrease in adsorption capacity of the prepared activated carbon under different storage conditions is shown. It is observed that the adsorption capacity of nitrate ion at equilibrium pH (pHe) 5 is halved after 5 weeks, and the decrease in adsorption capacity at pHe3 is suppressed. The adsorption isotherms of the prepared ACF are shown using the Langmuir equation. The effect of pH on the adsorption capacity of the prepared ACF is compared with that of ACF before heat treatment and zinc chloride-activated powdered activated carbon. The adsorption capacity of ACF without heat treatment at 950 °C decreases as the pHeof the solution increases, and the pH of the nitrate solution including ACF after heat treatment is stable at pHe4–5.
