Preparation of La-doped TiO2 Ultrafiltration Membrane by Templating of Block Copolymer

doi:10.15541/jim20140264

Abstract

Abstract:

La-doped TiO₂ ultrafiltration membrane was prepared via a block copolymer assisted polymeric Sol-Gel process. The effects of La doping on the mechanical property of TiO₂ gel, the crystal phase transformation and mesostructure of TiO₂materials were investigated by dynamic mechanical analysis (DMA), N₂ adsorption-desorption, X-ray diffraction (XRD), and X-ray photoelectron spectroscope (XPS) analysis. Results showed that the mechanical strength of the formed gel was significantly improved by the introduction of lanthanum, by which the risk of the membrane cracking could be reduced largely. X-ray diffraction analysis showed that La doping inhibited the TiO₂crystal phase transformation and the anatase phase could still keep stable at 800℃. Furthermore, the BET surface area and porosity of the materials were also increased. The optimal La doping amount was 0.74 g, and the formed TiO₂sol particle size was 10 nm. Futher more, the filtration experiments showed that the La-doped TiO₂ultrafiltration membrane possessed a pore size of 2.3 nm, while the pore size of the La-undoped TiO₂membrane was 2.7 nm.

Key words: La-doped, Sol-Gel, titania, ultrafiltration membrane

CLC Number:

TQ174

CHEN Tao-Tao, LI Dan, JING Wen-Heng, FAN Yi-Qun, XING Wei-Hong. Preparation of La-doped TiO₂Ultrafiltration Membrane by Templating of Block Copolymer[J]. Journal of Inorganic Materials, 2015, 30(2): 171-176.

Figures/Tables 9

Fig. 1 Effect of La doping on the particle size of TiO2 sol

Fig. 2 XRD patterns of TiO2 powders doped with different amounts of La and calcined at different temperatures

Fig. 3 Effects of La-doping on the crystal size of TiO2 powder calcined at different temperatures

Fig. 4 N2 adsorption-desorption isotherms (a) and BJH pore size distributions (b) obtained from TiO2 powder doped with different amounts of La and calcined at 400℃

Table 1 Pore properties of TiO2 powder doped with different amounts of La and calcined at 400℃

Samples	BET area/(m²·g^-1)	BJH pore diameter/nm	Total pore volume/(cm³·g^-1)	Porosity/%
La-undoped-400℃	102.3	3.70	0.1005	27.8
La-0.37g-400℃	144.3	3.28	0.1310	33.5
La-0.74g-400℃	169.6	3.70	0.1619	38.3
La-1.1 g-400℃	96.5	3.28	0.0949	26.7

Fig.5 Storage modulus (a) and loss modulus profiles (b) of La-undoped and -doped TiO2 gels

Fig. 6 XPS spectra of La-0.74 g TiO2 powders (a) and high-resolution XPS spectra of Ti2p (b), La3d (c), C1s (d) and O1s (e)

Fig. 7 Pure water flux (a) and PEG retention curves (b) of La-TiO2 membrane

Fig. 8 FESEM micrographs of the surface (a) and cross- section (b) of La-doped TiO2 membrane

References 20

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Preparation of La-doped TiO₂Ultrafiltration Membrane by Templating of Block Copolymer

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