Synthesis of Carbon-doped Mesoporous TiO2 Visible-light Photocatalytic Materials via One Pot Solvothermal Method†

doi:10.7503/cjcu20131301

Abstract

Abstract:

C doped TiO₂ mesoporous materials with spherical morphology were synthesized via solvothermal method in ethanol, using tetrabutyl titanate(TBOT) as the titanium source under template-free condition. The synthesized samples were characterized by XRD, SEM, TEM, N₂ adsorption-desorption, XPS, UV-Vis, and photocatalytic degradation of RhB. The results indicated that, the synthesized samples were pure phase anatase TiO₂, and they had morphology of uniform size spheres with the accumulation of the nanoparticles. The crystallinity and morphology of the synthesized samples could be regulated by the volume of adding acetic acid during the synthesis process. The results showed trace of C atoms getting into TiO₂ crystal lattice, replacing the position of O atoms, narrowing the band gap of TiO₂, and leading to the enhancement of visible light absorption. Photocatalytic test confirmed its excellent adsorption property and photocatalytic activity under visible light, which have very important meaning for solving environmental problems in current society.

Key words: C doped TiO2, Mesoporous material, Visible-light photocatalytic material, One pot solvothermal method

CLC Number:

O641
O643

TrendMD:

DING Shuang, ZHU Guowei, WANG Runwei, ZHANG Zongtao, QIU Shilun. Synthesis of Carbon-doped Mesoporous TiO₂ Visible-light Photocatalytic Materials via One Pot Solvothermal Method^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 1016.

Figures/Tables 9

Fig.1 XRD patterns of C-TiO2-x samples^a. C-TiO2-0; b. C-TiO2-2; c. C-TiO2-4; d. C-TiO2-6.

Fig.2 SEM images of C-TiO2-x samples^(A, B) C-TiO2-0; (C, D) C-TiO2-2; (E, F) C-TiO2-4; (G, H) C-TiO2-6.

Fig.3 IR spectra of C-TiO2-x samples^a. C-TiO2-0; b. C-TiO2-2; c. C-TiO2-4; d. C-TiO2-6.

Fig.4 TEM images of sample C-TiO2-4

Fig.5 N2 adsorption-desorption isotherms(A) and pore size distributions(B) of C-TiO2-x samples^a. C-TiO2-0; b. C-TiO2-2; c. C-TiO2-4; d. C-TiO2-6.

Table 1 Textual data of various samples prepared with different amounts of acetic acid

Sample	V(acetic acid)/mL	S_BET/(m²·g^-1)	Pore diameter/nm	V_pore/(cm³·g^-1)	Crystal size/nm	Molar fraction of C in Ti—C(%)
C-TiO₂-0	0	135.15	3.7	0.1491	7.6	1.17
C-TiO₂-2	2	113.90	6.2	0.1778	8.7	1.30
C-TiO₂-4	4	118.25	14.4	0.3255	8.3	1.48
C-TiO₂-6	6	138.65	12.4	0.4283	9.0	1.77
P25		64.515				0

Fig.6 Survey XPS spectra for C-TiO2-x(A) and XPS spectra for C1s state(B)^ a. C-TiO2-0; b. C-TiO2-2; c. C-TiO2-4; d. C-TiO2-6.

Fig.7 UV-Vis spectra of P25(a) and C-TiO2-0(b)

Fig.8 Photocatalytic activity of C-TiO2-x samples^▲ C-TiO2-0; ▼ C-TiO2-2; ◆ C-TiO2-4; ? C-TiO2-6; ● P25; ■ no catalyst.

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Synthesis of Carbon-doped Mesoporous TiO₂ Visible-light Photocatalytic Materials via One Pot Solvothermal Method^†

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