Porous Bamboo Charcoal/TiO2 Nanocomposites: Preparation and Photocatalytic Property

doi:10.15541/jim20180379

Abstract

Abstract:

Here we report a novel surface modified bamboo charcoal/TiO₂ (SMBC/TiO₂) nanocomposites with high adsorption and photocatalytic property. SMBC were prepared by a wet oxidization method of cheap natural bamboo charcoal (BC) with good absorbent and chemical stabilities. After modification, high density of carboxyl groups were generated on the surface of BC, thus SMBC particles can be easily dispersed in water and have stronger interactions with TiO₂ nanoparticles, which ensure SMBC uniformly coated on TiO₂. And SMBC/TiO₂ nanocomposties have much higher specific surface area than BC/TiO₂, which could offer higher adsorption capacity. The saturated adsorption capacity of SMBC/TiO₂ is approximately 1.6 times, 12.1 times as great as BC/TiO₂ and pure TiO₂, respectively. The synergetic effect of adsorption and catalysis endow SMBC/TiO₂ composites much higher photocatalytic activity than BC/TiO₂ and pure TiO₂ for MB degradation, and the rate constant for MB photocatalytic degradation of SMBC/TiO₂ was almost 7 times and 6 times as large as BC/TiO₂ and pure TiO₂, respectively.

Key words: TiO₂, porous materials, wet oxidization, photocatalysis, adsorption

CLC Number:

TF125

PANG Qiu-Hu, LIAO Guang-Fu, HU Xiao-Yu, ZHANG Quan-Yuan, XU Zu-Shun. Porous Bamboo Charcoal/TiO₂ Nanocomposites: Preparation and Photocatalytic Property[J]. Journal of Inorganic Materials, 2019, 34(2): 219-224.

Figures/Tables 8

Scheme 1 Schematic illustration of the formation for SMBC/TiO2 nanocomposites

Fig. 1 (a) FT-IR spectra of BC and SMBC, (b) XRD patterns of pure TiO2 and SMBC/ TiO2 nanocomposites

Fig. 2 FESEM images of nanocomposites(a-b) BC/TiO2; (c-d) SMBC/TiO2

Fig. 3 N2 adsorption-desorption isotherms of BC/TiO2 and SMBC/TiO2 nanocomposit

Table 1 Textural properties of different materials

Sample	S_BET/(m²·g^-1)	V_t/(cm³·g^-1)	Pore size/nm
BC/TiO₂	71	0.17	7.7
SMBC/TiO₂	155	0.36	13.7

Fig. 4 (a) Changes of relative concentration of MB in the presence of TiO2, BC/TiO2 and SMBC/TiO2 under the same condition, and (b) ln(C0/Ct) vs. time of MB photocatalytic degradation for pure TiO2, BC/TiO2 and SMBC/TiO2

Table 2 Saturated adsorption capacity of MB in dark and kinetic data of photocatalytic degradation in the presence of different catalysts

Sample	Q/(mg·g^-1)	k/(×10^-2, min^-1)
TiO₂	5.9	0.79
BC/TiO₂	44.7	0.66
SMBC/TiO₂	71.5	4.85

Fig. 5 Time-dependent UV-Vis spectra of MB aqueous solution in the presence of pure TiO2 (a), BC/TiO2 (b) and SMBC/TiO2 (c). The insets show the corresponding changes of MB aqueous solution in color

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Porous Bamboo Charcoal/TiO₂ Nanocomposites: Preparation and Photocatalytic Property

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