介孔二氧化硅KIT-6介观单晶微球的合成

doi:10.19964/j.issn.1006-4990.2022-0035

Abstract

Abstract:

Single-crystalline mesoporous silica KIT-6 microspheres were synthesized using complex micelles formed by nonionic surfactant（polyethylene oxide（PEO）-polypropylene oxide （PPO）-polyethylene oxide，P123） and cationic polyelectrolyte（poly dimethyldiallyl ammonium chloride，PAC） as templates.The morphology and pore structure of the synthesized materials were characterized by scanning electron microscope（SEM），transmission electron microscope（TEM），X-ray diffraction（XRD），nitrogen physical adsorption and thermogravimetric analysis（TGA）.The results showed that the mesoporous KIT-6 silica material synthesized with the organic complex micelles as templates had regular spherical morphology and particle diameter of 2~3 μm.It had a large specific surface area and pore volume（747 m²/g and 1.3 cm³/g） and the mesoporous pore size was 8.5 nm.Within the whole KIT-6 particle，the alignment of mesopores exhibited long-range order.Due to the strong interaction between long-chain polyelectrolyte PAC and the silicon source，the samples were synthesized at a relatively high hydrothermal temperature（160 ℃），which was helpful to improve the stability of the mesoscopic structure.This synthesis method had some enlightening significance for the synthesis of mesoporous silica KIT-6 single crystal microspheres and their applications in the fields of catalysis，adsorption and separation.

Key words: mesoporous silica, KIT-6, ordered mesopores, nonionic surfactant, cationic polyelectrolyte

CLC Number:

TQ127.2

HONG Meihua,LIU Guanfeng,GONG Yupeng,LI Liqing,CHEN Tiehong. Synthesis of mesoporous silica KIT-6 microspheres with single-crystalline mesostructure[J]. Inorganic Chemicals Industry, 2022, 54(7): 149-156.

Figures/Tables 14

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References 19

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样品	d₂₁₁/nm	a₀^a/nm	比表面积/（m²·g^-1）	孔体积/（cm³·g^-1）	介孔尺寸^b/nm
K-1	8.8	22.7	752	1.0	7.5
K-PAC	8.9	22.9	747	1.3	8.5

KIT-PAC-n	比表面积/ （m²·g^-1）	孔体积/ （cm³·g^-1）	介孔尺寸/ nm
KIT-PAC-0.1	816	1.3	8.6
KIT-PAC-0.3	760	1.2	8.4
KIT-PAC-0.5	747	1.3	8.5
KIT-PAC-0.7	694	0.9	8.5

样品	比表面积/（m²·g^-1）	孔体积/ （cm³·g^-1）	介孔尺寸/ nm
KIT-6-100	717	1.02	7.5
KIT-6-120	575	1.05	14.0
KIT-6-160	415	1.39	—
PAC-KIT-100	720	1.30	8.5
PAC-KIT-120	762	1.50	8.6
PAC-KIT-160	490	1.20	8.4

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Synthesis of mesoporous silica KIT-6 microspheres with single-crystalline mesostructure

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