Photocatalytic Performance of Nano-TiO2/Diatomite Composite

doi:10.15541/jim20150448

Abstract

Abstract:

Nano-TiO₂/diatomite composite was synthesized by hydrolysis-deposition method using diatomite as supporter and titanium tetrachloride as precursor. The prepared composite was characterized by X-ray diffraction, scanning electron microscopy and N₂ adsorption-desorption. The photocatalytic property of composite was determined by Rhodamine B as a target pollutant. The effects of various parameters that affect the photocatalytic properties of composite were studied. The results show that anatase TiO₂ loaded on the surface of diatomite in agglomerate and disperse states. The catalyst dosage, dye solution pH, inorganic ions and illumination intensity could affect the photocatalytic activity of TiO₂/diatomite composite in different degrees. The photocatalytic degradation rate of Rhodamine B was up to 99.8% under the conditions as follows: 10 mg/L initial dye concentration, 1.0 g/L catalyst dosage, 300 W UV light intensity, and 60 min illumination time.

Key words: TiO2/diatomite, XRD, photocatalysis, Rhodamine B

CLC Number:

TQ174

ZHANG Guang-Xin, DONG Xiong-Bo, ZHENG Shui-Lin. Photocatalytic Performance of Nano-TiO₂/Diatomite Composite[J]. Journal of Inorganic Materials, 2016, 31(4): 407-412.

Figures/Tables 13

Table 1 Chemical composition of the purified diatomite and nano-TiO2/diatomite

Composition/wt%	SiO₂	Al₂O₃	Fe₂O₃	MgO	TiO₂	L.O.I
Diatomite	92.27	2.21	0.48	0.56	0.21	2.84
Nano-TiO₂/ Diatomite	68.69	1.93	0.27	0.39	25.96	1.67

Fig. 1 XRD patterns of diatomite and nano-TiO2/diatomite composite

Fig. 2 SEM images of diatomite (a, b) and nano-TiO2/diatomite composite (c)

Fig. 3 Nitrogen adsorption-desorption isotherms and pore size distributions of diatomite and nano-TiO2/diatomite composite

Table 2 Physical characters and crystallite size of diatomite and nano-TiO2/diatomite composite

Sample	BET surface area /(m²·g^-1)	Pore volume/(cm³·g^-1)	Average pore diameter/nm	Cryatalline size /nm
Diatomite	26.20	0.04	5.28	—
TiO₂/Diatomite	30.80	0.06	5.93	15.57

Table 3 Main characteristics of dye

Dye	Category	Molecular formula	Molecular structure	λ_max/nm
Rhodamine B(RhB)	Xanthene dye	C₂₈H₃₁ClN₂O₃		554

Fig. 4 Effect of nano-TiO2/diatomite composite amount on the degradation of RhB (a) and degradation kinetic plots of RhB (b)

Table 4 Model parameters for degradation of dyes by nano-TiO2/diatomite composite

Catalyst dosage/ (g·L^-1)	k /min^-1	R²
0.5	0.058	0.998
1.0	0.072	0.992
2.0	0.100	0.989
3.0	0.102	0.999

Fig. 5 Effect of nano-TiO2/diatomite composite amount on the degradation rate and quantity of RhB

Fig. 6 Effect of initial pH on the adsorption and degradation of dyes by nano-TiO2/diatomite composite

Fig. 7 Zeta potential of TiO2/diatomite composite

Fig. 8 Effect of inorganic ions on the degradation of RhB by nano-TiO2/diatomite composite

Fig. 9 Effect of illumination intensity on the degradation of RhB by nano-TiO2/diatomite composite

References 16

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Photocatalytic Performance of Nano-TiO₂/Diatomite Composite

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