转化方式对粉煤灰地聚物原位转化沸石及其Pb<sup>2+</sup>吸附性能的影响

doi:10.11896/cldb.21070249

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Abstract Using high-alumina fly ash as the precursor, the porous fly ash geopolymer rich in zeolitephase was prepared by alkali excitation and chemical foaming. With the geopolymer as the framework, the zeolite-like phase was transformed into zeolite through in-situ transformation to form a self-supporting zeolite-like adsorption material. In addition, this work explores the regulation of the mineral composition of porous fly ash geopolymer under three in-situ conversion modes, alkali-thermal conversion, hydrothermal conversion, and microwave conversion; the static adsorption behavior of zeolite-based adsorbents prepared under different in-situ conversion conditions on Pb²⁺was also studied. The results show that the alkali-heat conversion is beneficial to the in-situ conversion of the zeolite-like phase to the zeolite phase in the porous fly ash geopolymer, which significantly increases the adsorption capacity for Pb²⁺. The adsorption of Pb²⁺ by the alkali-thermal conversion porous fly ash geopolymer belongs to the single molecular layer adsorption. The adsorption kinetics fitting results show that the adsorption of Pb²⁺ by the alkali-thermal conversion porous fly ash geopolymer can be divided into physical adsorption and chemical adsorption. When the initial concentration of Pb²⁺ is 100 mg/L and 300 mg/L, the adsorption process is dominated by physical adsorption; when the initial concentration of Pb²⁺ is 500 mg/L, the adsorption process is accompanied by the formation of a large number of chemical bonds, and the chemical adsorption effect is stronger.

Key words： porous geological polymer in-situ conversion zeolite lead ion adsorption

Published: Online: 2023-03-27

CLC number:

TB321

Fund:Scientific Research Project of Shaanxi Province (2018SF-367).

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	SONG Xuefeng
	LU Weining

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SONG Xuefeng,LU Weining. Influence of Conversion Method on In-situ Conversion of Fly Ash Geopolymer to Zeolite and Its Pb²⁺ Adsorption Performance[J]. Materials Reports, 2023, 37(6): 21070249-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21070249 OR http://www.mater-rep.com/EN/Y2023/V37/I6/21070249

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