Hollow Carbon Sphere with Tunable Structure by Encapsulation Pyrolysis Synchronous Deposition for Cefalexin Adsorption

doi:10.15541/jim20190276

Abstract

Abstract:

Hollow carbon spheres (HCS) with controllable diameter and shell thickness using a simple encapsulation pyrolysis synchronous deposition method is reported. This method changed the polystyrene spheres (PS), a widely used sacrifice hard template, into carbon by a pyrolysis and synchronous deposition process in the hermetical silica shell, without any cross-linking agent and catalyst, simplifying synthesis, and lowering costs. The obtained HCS exhibited uniform spherical morphology with tailorable particle size (190-1600 nm) and well controlled hollow voids. Moreover, HCS samples with precisely tuned thickness (4.5-13.5 nm) were obtained only by changing the silica precursor amount. The resultant HCS showed promising potential for applications in cefalexin adsorption with capacity of 291 mg·g ^-1. Therefore, this synthetic strategy may offer an efficient production route to commercial applications for HCS.

Key words: hollow carbon spheres, encapsulation pyrolysis synchronous deposition, tunable structure, cefalexin adsorption

CLC Number:

TQ174

DU Juan, LIU Lei, YU Yifeng, ZHANG Yue, LÜ Haijun, CHEN Aibing. Hollow Carbon Sphere with Tunable Structure by Encapsulation Pyrolysis Synchronous Deposition for Cefalexin Adsorption[J]. Journal of Inorganic Materials, 2020, 35(5): 608-616.

Figures/Tables 6

Fig. 1 Preparation routes and TEM (b,c) and SEM (c) images (a) Schematic illustration of the synthesis of the HCS (Route 1) and hollow mesoporous silica spheres (Route 2); (b) TEM image of PS@mSiO2; (c) TEM and SEM images of mSiO2

Fig. 2 TEM images of PS@SiO2 hybrids sphere (a-c) and HCS-1 (d-f)

Fig. 3 TEM images of HCS-1.5 (a-c) and HCS-0.5 (d-f), the relationship between TEOS amount and HCS thickness (g), and schematic illustration for the pyrolysis deposition of the PS inside the mesoporous silica shell (h) and the silica shell encapsulation nanoreactor (i), TGA analyses of PS and PS@SiO2 samples in N2 (j) and air (k)

Fig. 4 N2 adsorption-desorption isotherms (a) and pore distributions (b) of HCS, XRD patterns of HCS-1 (c), XPS spectra of HCS-1 (d), C1s (e) and O1s (f) spectra of HCS-1

Fig. 5 SEM images of HCS with dimeter size of 400, 900 and 1600 nm obtained by changing the dimeter of PS (a-c) and N2 adsorption-desorption isotherm (d) and pore distribution (inset) of HCS

Fig. 6 Adsorption curve of cefalexin over HCS-1 for the contact time (a), various initial concentrations (b), and corresponding Kinetics (c-d) and isothermal (e-f) fittings

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