Synthesis of Mesoporous Carbon Using Halloyiste As Template

doi:10.3724/SP.J.1077.2014.13462

Abstract

Abstract:

Mesoporous carbons with“core-shell”structure were synthesized using halloysite as template and sucrose as carbon precursor by a template method. Field-emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), nitrogen adsorption, X-ray diffraction, Raman spectra and Thermogravimetry (TG) were employed to cheracterize the as-synthesized materials. Results indicate that the morphology and structure of the templated carbons are similar to that of halloysite. The carbons exhibit higher specific surface area (945 m²/g and 1147 m²/g), higher pore volumes and mesopore volume fraction than that of halloysite. The carbons present high purity and amorphous structure. Raising the carbonization temperature, the Raman characteristic parameter (R) of the carbons decreases and their decomposition temperature increases from 563℃ to 623℃. At the same time, the formation mechanism of the carbons and their pores is also discussed.

Key words: halloysite, template, mesoporous carbon

CLC Number:

TQ424

ZHOU Shu-Hui, CHUAN Xiu-Yun. Synthesis of Mesoporous Carbon Using Halloyiste As Template[J]. Journal of Inorganic Materials, 2014, 29(6): 584-588.

Figures/Tables 9

Fig. 1 SEM (a) and TEM (b) images of halloysite

Fig. 2 SEM (a) and TEM (b) images of sample HC-700 and SEM images of sample C-700 (c, d)

Fig. 3 TEM image of sample C-700 (a) and corresponding magnified image of the square area (b)

Fig. 4 N2 adsorption-desorption isotherms of samples C-700 and C-900

Table 1 Specific surface area and pore parameters of halloysite and templated carbons

Sample	S_BET/ (m²•g^-1)	V_total/ (cm³•g^-1)	V_meso/(cm³•g^-1)	Average pore size / nm	Mesoporosity / %
Halloysite	69	0.26	0.22	9.3	84
C-700	945	1.58	1.56	6.3	98
C-900	1147	2.25	2.17	7.1	96

Fig. 5 XRD patterns of halloyiste and the templated carbons C-700 and C-900

Fig. 6 Raman spectra of samples C-700 and C-900

Table 2 Raman characteristic parameters (R) of samples C-700 and C-900

Sample	R₁	R₂	R₃
C-700	2.67	2.87	2.69	2.74
C-900	2.31	2.29	2.17	2.26

Fig. 7 TG curves of samples C-700 and C-900

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