杂化二氧化锰气凝胶的制备及其对氨气的吸附

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Abstract Pure manganese dioxide aerogel was synthesized by one-step reduction method and ice template method. Cellulose nanofibers (CNF) were used to hybridise and enhance the mechanical properties of pure manganese dioxide aerogel materials. Through characterization techniques, the formation mechanism and microscopic mechanism of the hybrid aerogel were explored. The adsorption effect of hybrid aerogel on NH₃ was analyzed. Inside the material, CNFs acted as skeleton to disperse MnO₂ nanoparticles, while MnO₂ and hydroxyl groups on CNFs surface were combined by forming hydrogen bonds, which effectively improved the mechanical strength of the material. It's specific surface area was 56.50cm²/g, and it's average pore diameter was 9.32nm. The adsorption of NH₃ was the combined action of physical adsorption and chemical adsorption. NH₃ molecules entered the aerogel pores by van der Waals forces, and were absorbed by the adsorption sites and retained in the interior of the material. When the ambient temperature was 15℃ and the relative humidity was 50%, the adsorption effect of the hybrid aerogel on 10x10^-6 NH₃ for 6h was 99.7%.

Key words： hybrid manganese dioxide aerogel cellulose nanofibers ammonia adsorbent

Received: 25 November 2022

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X511

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	Articles by authors
	ZHI Jian-hui
	SHI Ze-peng
	SUN Xiao-qian
	CHEN Ting
	GENG Hong

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ZHI Jian-hui,SHI Ze-peng,SUN Xiao-qian等. Preparation of hybrid manganese dioxide aerogel and its application in ammonia adsorption[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3368-3377.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3368

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