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.
宋学锋, 陆伟宁. 转化方式对粉煤灰地聚物原位转化沸石及其Pb2+吸附性能的影响[J]. 材料导报, 2023, 37(6): 21070249-7.
SONG Xuefeng, LU Weining. Influence of Conversion Method on In-situ Conversion of Fly Ash Geopolymer to Zeolite and Its Pb2+ Adsorption Performance. Materials Reports, 2023, 37(6): 21070249-7.
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2023, Vol. 37 
