Preparation of nitrogen-doped activated carbon derived from corncob and adsorption property

Abstract N-doped activated carbon was prepared from corncob with KOH-activation and urea used as N-doping agent. 77 K nitrogen adsorption isotherm was measured to determine the specific surface area and the pore size distribution. The surface and morphous were analyzed by XRD, XPS, and FT-IR. The effect of urea adding amount and adding stage on the properties of activated carbon was investigated. It was showed that the specific surface area of nitrogen-doped activated carbon can reach higher than 3 000 m²·g^-1. Nitrogen-doped activated carbon with urea added at different stages had similar pore size distribution, when the adsorption performance of N₂, CH₄ and CO₂ was distinct due to the difference in specific surface area and nitrogen content. The addition of urea was beneficial to enhance the adsorption selectivity of activated carbon for CO₂ by increasing the content of pyrrolic nitrogen. The ACNA2 presented the best CO₂ adsorption and separation performance at 268 K. Comparing with the sample AC without adding urea, the separation factor of CO₂/N₂ and CO₂/CH₄ were 10.30 and 3.74, increased by 87.6% and 59.8% respectively.

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	LIU Yuchun
	SU Wei
	SUN Yan
	ZHAO Yu
	ZHU Rongjiao
	CHEN Lei

Keywords： corncob urea nitrogen-doped activated carbon adsorption

Received 2021-12-13;

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LIU Yuchun, SU Wei, SUN Yan, ZHAO Yu, ZHU Rongjiao, CHEN Lei.Preparation of nitrogen-doped activated carbon derived from corncob and adsorption property[J] Chemcial Industry and Engineering, 2023,V40(5): 135-143

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