天然沸石结构对合成分子筛吸附脱氮性能影响

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Abstract In response to the problem of deep denitrification of sewage plant effluent, four types of natural zeolites (denoted as A, B, C, D) selected from several typical domestic natural zeolite deposits, were used to produce molecular sieves through a direct alkali dissolution-hydrothermal crystallization synthesis process. Their respective ammonia nitrogen adsorption properties were investigated. Using XRF, XRD and other material characterization methods, the differences in element composition and mineral content of the four natural zeolites were compared and analyzed. The influence of material characteristics of natural zeolites on the adsorption performance of their synthetic products was examined based on the crystal structure, elemental composition and surface morphology of the synthetic products. The results illustrated that compared with raw zeolite materials, the ammonia nitrogen adsorption performance of the four synthetic products was significantly improved, among which the synthetic products from zeolite C and A had relatively higher adsorption capacity, all reaching more than 15mg/g. A positive correlation existed between the synthetic product’s adsorption performance and its raw zeolite material’s alkali-soluble silicon dissolution amount. The alkali-soluble silicon mainly came from the cristobalite, clinoptilolite, mordenite, feldspar and other mineral components in the natural zeolite raw material, while the quartz with stable structure was not easy to be activated and utilized by alkali dissolution. The synthetic product was a mixture containing different types of molecular sieves and other mineral components. Zeolites C and A with high amount of alkali-soluble silica were synthesized into type A and type X molecular sieves which had good ammonia nitrogen adsorption performance. The synthetic products of zeolites B and D were mainly sodalite molecular sieves with pore diameter smaller than the particle size of ammonium ion, and thus they had poor adsorption performance. Therefore, it is better to select raw zeolite materials with less quartz mineral content and high proportion of alkali-soluble minerals to produce synthetic molecular sieves for sewage denitrification.

Key words： natural zeolite mineral composition molecular sieve hydrothermal synthesis adsorption ammonia nitrogen

Received: 28 November 2020

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X703.1

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	WU Xu-yuan
	ZHENG Xiao-ying
	HAO Rui-xia
	WANG Hong-bo
	SUN Tong
	LI Jia-wen
	LI Peng

Cite this article:

WU Xu-yuan,ZHENG Xiao-ying,HAO Rui-xia等. Influence of natural zeolite structure on the adsorption and denitrification performance of synthetic molecular sieve[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3193-3200.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3193

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