粉煤灰用碱煅烧并通过超声辅助老化和原位水热法制备了Y型纳米沸石（NFA-Y），该工艺中不添加任何有机模板剂和其他硅铝源。利用XRD、SEM和BET分析了合成的纳米Y沸石的形貌、结晶度、结构和比表面积，分析了超声时长对Y沸石形貌和晶相的影响。结果表明，超声老化有利于水热合成纳米Y沸石，使其形貌更规则、粒子分散性更好、晶粒可能更小。合成的沸石比表面积为508 m²/g，孔体积为0.342 cm³/g，晶粒尺寸约为80 nm。通过静态吸附实验探究了Y型沸石对Cr （Ⅵ）的吸附特性，结果表明，其吸附动力学符合准二级动力学模型。

Zeolite Y nanoparticles (NFA-Y) is obtained through calcining fly ash by alkaline, and applying ultrasound-assisted aging and using situ hydrothermal synthesis method without using any organic template, Si source or Al source.The morphology and crystallinity, structure, specific surface area of the obtained zeolite Y nanoparticles is determined by means of X-ray powder diffraction (XRD) analysis, scanning electron microscopy (SEM) and nitrogen adsorption surface analyzer (BET).The effects of the time spent in ultrasonic aging on the morphology and crystallinity of zeolite Y are investigated.Experimental results demonstrate the ultrasonic aging is helpful to hydrothermal synthesis of nanocrystal zeolite Y, making it have a more regular morphology, better dispersion of particles and possibly smaller crystal sizes.The zeolite Y synthesized under the optimal conditions has a specific surface area of 508 m²·g^-1, a pore volume of 0.342 cm³·g^-1, a crystal grain size of 80 nm.The adsorption characteristics of zeolite Y to Cr(Ⅵ) in aqueous solution are studied via static adsorption experiments, and it is shown that it is in accordance with the quasi second order kinetic model.

刘若妍(1996-),女,硕士研究生,研究方向为污水处理,1229849048@qq.com。