Removal of fluoride from water using titanium-based adsorbents

doi:10.1007/s11783-010-0241-y

Front Envir Sci Eng Chin

2010, Vol. 4

Issue (4) : 414-420 https://doi.org/10.1007/s11783-010-0241-y

RESEARCH ARTICLE

Removal of fluoride from water using titanium-based adsorbents

Zhijian LI, Shubo DENG(

), Xueying ZHANG, Wei ZHOU, Jun HUANG, Gang YU

Department of Environmental Science and Engineering, POPs Research Center, Tsinghua University, Beijing 100084, China

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Abstract

Three adsorbents including TiO₂, Ti-Ce, and Ti-La hybrid oxides were prepared to remove fluoride from aqueous solution. The Ti-Ce and Ti-La hybrid adsorbents obtained by the hydrolysis-precipitation method had much higher sorption capacity for fluoride than the TiO₂ adsorbent prepared through hydrolysis. Rare earth (Ce and La) oxides and TiO₂ exhibited a synergistic effect in the hybrid adsorbents for fluoride sorption. The sorption equilibrium of fluoride on the three adsorbents was achieved within 4 h, and the pseudo-second-order model described the sorption kinetics well. The sorption isotherms fitted the Langmuir model well, and the adsorption capacities of fluoride on the Ti-Ce and Ti-La adsorbents were about 9.6 and 15.1 mg·g^-1, respectively, at the equilibrium fluoride concentration of 1.0 mg·L^-1, much higher than the 1.7 mg·g^-1 on the TiO₂. The sorption capacities of fluoride on the three adsorbents decreased significantly when the solution pH increased from 3 to 9.5. The electrostatic interaction played an important role in fluoride removal by the three adsorbents, and Fourier transform infrared (FTIR) analysis indicated that the hydroxyl groups on the adsorbent surface were involved in fluoride adsorption.

Keywords fluoride adsorption titanium dioxide titanium-based adsorbent sorption mechanism

Corresponding Author(s): DENG Shubo,Email:dengshubo@tsinghua.edu.cn

Issue Date: 05 December 2010

Cite this article:

Zhijian LI,Shubo DENG,Xueying ZHANG, et al. Removal of fluoride from water using titanium-based adsorbents[J]. Front Envir Sci Eng Chin, 2010, 4(4): 414-420.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0241-y
https://academic.hep.com.cn/fese/EN/Y2010/V4/I4/414

Fig.1

Adsorption capacities of fluoride on the different adsorbents (sorption conditions: 0.01 g adsorbent in 100 mL of 10 mg·L^-1 fluoride solution at pH 6 for 12 h at 25°C)

Fig.2

Effect of solution pH on fluoride adsorption on the TiO₂, Ti-Ce, and Ti-La adsorbents

Fig.3

Zeta potentials of the TiO₂, Ti-Ce and Ti-La adsorbents as a function of solution pH

Fig.4

Adsorption kinetics of fluoride on the TiO₂, Ti-Ce, and Ti-La adsorbents, and modeling results using the pseudo-second-order equation (t/q_t = 1/υ₀ + t/q_e, υ₀ represents the initial sorption rate, and q_e is the adsorption capacity at equilibrium)

Fig.5

Adsorption isotherms of fluoride on the TiO₂, Ti-Ce and Ti-La adsorbents

Fig.6

FTIR spectra of the (a) TiO₂, (b) Ti-Ce, and (c) Ti-La adsorbents before and after fluoride adsorption

Tab.1

Calculated equilibrium constants using the Langmuir and Freundlich equations for fluoride sorption on the TiO₂, Ti-Ce and Ti-La adsorbents

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