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GIS-NaP1 沸石微球作为潜在的水吸附材料：初始二氧化硅浓度对吸附及物理/拓扑性质的影响

GIS-NaP1 zeolite microspheres as potential water adsorption material: Influence of initial silica concentration on adsorptive and physical/topological properties.

作者信息

Sharma Pankaj, Song Ju-Sub, Han Moon Hee, Cho Churl-Hee

机构信息

Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Republic of Korea.

出版信息

Sci Rep. 2016 Mar 11;6:22734. doi: 10.1038/srep22734.

DOI:10.1038/srep22734
PMID:26964638
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4786819/
Abstract

GIS-NaP1 zeolite samples were synthesized using seven different Si/Al ratios (5-11) of the hydrothermal reaction mixtures having chemical composition Al2O3:xSiO2:14Na2O:840H2O to study the impact of Si/Al molar ratio on the water vapour adsorption potential, phase purity, morphology and crystal size of as-synthesized GIS-NaP1 zeolite crystals. The X-ray diffraction (XRD) observations reveal that Si/Al ratio does not affect the phase purity of GIS-NaP1 zeolite samples as high purity GIS-NaP1 zeolite crystals were obtained from all Si/Al ratios. Contrary, Si/Al ratios have remarkable effect on the morphology, crystal size and porosity of GIS-NaP1 zeolite microspheres. Transmission electron microscopy (TEM) evaluations of individual GIS-NaP1 zeolite microsphere demonstrate the characteristic changes in the packaging/arrangement, shape and size of primary nano crystallites. Textural characterisation using water vapour adsorption/desorption, and nitrogen adsorption/desorption data of as-synthesized GIS-NaP1 zeolite predicts the existence of mix-pores i.e., microporous as well as mesoporous character. High water storage capacity 1727.5 cm(3) g(-1) (138.9 wt.%) has been found for as-synthesized GIS-NaP1 zeolite microsphere samples during water vapour adsorption studies. Further, the total water adsorption capacity values for P6 (1299.4 mg g(-1)) and P7 (1388.8 mg g(-1)) samples reveal that these two particular samples can absorb even more water than their own weights.

摘要

使用化学组成为Al2O3:xSiO2:14Na2O:840H2O的水热反应混合物的七种不同Si/Al比（5 - 11）合成了GIS-NaP1沸石样品，以研究Si/Al摩尔比对合成的GIS-NaP1沸石晶体的水蒸气吸附潜力、相纯度、形态和晶体尺寸的影响。X射线衍射（XRD）观察表明，Si/Al比不影响GIS-NaP1沸石样品的相纯度，因为从所有Si/Al比都获得了高纯度的GIS-NaP1沸石晶体。相反，Si/Al比对GIS-NaP1沸石微球的形态、晶体尺寸和孔隙率有显著影响。对单个GIS-NaP1沸石微球的透射电子显微镜（TEM）评估表明，初级纳米微晶的包装/排列、形状和尺寸发生了特征性变化。使用合成的GIS-NaP1沸石的水蒸气吸附/解吸以及氮气吸附/解吸数据进行的结构表征预测了混合孔的存在，即微孔以及介孔特征。在水蒸气吸附研究中，合成的GIS-NaP1沸石微球样品具有1727.5 cm(3) g(-1)（138.9 wt.%）的高储水容量。此外，P6（1299.4 mg g(-1)）和P7（1388.8 mg g(-1)）样品的总水吸附容量值表明，这两个特定样品能够吸收比自身重量更多的水。

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