Synthesis of montmorillonite-chitosan hollow and hierarchical mesoporous spheres with single-template layer-by-layer assembly

doi:10.1016/j.jmst.2019.05.046

Abstract

Abstract:

In order to develop a facile and precisely controlled approach to synthesize hierarchical mesoporous materials with tailored property, in this work, a novel study was carried out to fabricate montmorillonite-chitosan hollow and hierarchical mesoporous spheres (MMTNS@CS-HMPHS) based on single-template layer-by-layer (LbL) assembly. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area analysis and X-ray photoelectron spectroscopy (XPS) analyses were carried out to characterize the morphology and surface properties of MMTNS@CS-HMPHS. Benefitting from the unique lamellar structure of MMTNS, mesoporous channels are formed on the shell of MMTNS@CS hollow spheres, resulting in high surface area. Moreover, the surface functionalization and pore size of MMTNS@CS-HMPHS can be easily tuned, due to the tailored property through LbL assembly method. Besides the unique microstructure, MMTNS@CS-HMPHS also possesses the active sites generated from both MMT and chitosan, which greatly promotes its performance in fields of adsorption, drug delivery and catalyst supports, etc.

Key words: Montmorillonite, Chitosan, LbL assembly, MMTNS@CS-HMPHS

Peng Chen, Yunliang Zhao, Tianxing Chen, Tingting Zhang, Shaoxian Song. Synthesis of montmorillonite-chitosan hollow and hierarchical mesoporous spheres with single-template layer-by-layer assembly[J]. J. Mater. Sci. Technol., 2019, 35(10): 2325-2330.

Figures/Tables 9

Fig. 1. (a) Schematic illustration of the route for preparing MMTNS@CS-HMPHS and (b) unique microstructure and potential applications of MMTNS@CS-HMPHS.

Fig. 2. (a) Typical AFM morphology image (4 μm × 4 μm, 512 pixels) of the prepared MMTNS and (b) topographic profile along the red line in the corresponding image.

Fig. 3. (a) SEM images of original PS spheres, (b, e, f) SEM images of PS spheres after LbL assembly with different magnification and (c, g, d, h) TEM images of PS@chitosan and PS@chitosan@MMTNS with different magnification, respectively.

Table 1 Atomic fraction (%) of MMTNS@CS-HMPHS.

O	Si	Mg	C	Al	N	Others
46.15	19.23	2.3	20.74	7.03	1.39	3.16

Fig. 4. EDS elemental mapping of MMTNS@CS-HMPHS.

Fig. 5. XPS high-resolution scans for (a) C 1s and (b) O 1s of MMTNS@CS-HMPHS.

Fig. 6. SEM and TEM images of MMTNS@CS-HMPHS with different magnification.

Fig. 7. (a) Nitrogen sorption isotherm and (b) pore size distribution of MMTNS@CS-HMPHS.

Fig. 8. Schematic illustration for formation of mesoporous channels on the shell of MMTNS@CS hollow sphere.

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