Citation: WEI Shi-Yong, WANG Rui, NIU Peng-Ju, FANG Dun, YANG Xiao-Hong, DAN You-Meng. Preparation, Characterization and Fluoride Adsorption Characteristics of Iron-Oxide-Modified Vermiculite[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(9): 1619-1628. doi: 10.11862/CJIC.2016.200 shu

Preparation, Characterization and Fluoride Adsorption Characteristics of Iron-Oxide-Modified Vermiculite

Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, Department of Chemistry and Environmental Engineering, Hubei University for Nationalities, Enshi, Hubei 445000, China

Corresponding author: WEI Shi-Yong, xiangju12345@126.com
Received Date: 20 April 2016
Revised Date: 8 July 2016

Figures(6)

Iron-oxide-modified vermiculite (Verm-Fe_x, x=5, 10, 20) was prepared by a co-precipitation procedure. The surface properties and fluoride adsorption of pure vermiculite (Verm) and Verm-Fe_x were investigated. Compared to Verm, the d₍₀₀₂₎ spacing of Verm in Verm-Fe_x increases slightly, and the pore volumes, different surface areas and surface fractal dimension of Verm-Fe_x increase with increasing the Fe contents. The increased magnitude of the micropore volume and external surface area of Verm-Fe_x is more significant. The isoelectric point (IEP) of the samples increases in the order of Verm < Verm-Fe₅ < Verm-Fe₁₀ < Verm-Fe₂₀, and the ζ potential at pH 5.0 of the four samples is -16.4, -6.1, 10.5, and 28.4 mV, respectively. One-site Langmuir model was used to describe the fluoride adsorption by the samples (R²=0.973~0.995), and the determination coefficient (R²) for Verm is the highest. The R² fitted from two-site model for Verm-Fe_x(x=5, 10, 20) is higher than that from one-site model, indicating that the adsorption data of Verm-Fe_x can be fitted by two-site model well. The R² fitted from Freundlich model of the samples is lying in the range of 0.835~0.937 and follows the sequence of Verm < Verm-Fe₅ < Verm-Fe₁₀ < Verm-Fe₂₀. This indicates that Verm-Fe_x possesses the heterogeneous surfaces with different reactive sites. When pH=5.0, the adsorption capacities (q_max) of Verm, Verm-Fe₅, Verm-Fe₁₀ and Verm-Fe₂₀ are 3.18, 6.76, 9.27 and 12.43 mg·g^-1, respectively. Compared to Verm, Verm-Fe_x with a high Fe content has a higher adsorption capacity for fluoride in solutions.
- vermiculite,
- iron-oxide-modified vermiculite,
- surface properties,
- adsorption,
- fluoride
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