Removal of Boron from Water by Mg-Al-Ce Hydrotalcite Adsorption

doi:10.15541/jim20190383

Abstract

Abstract:

Boron is an important micronutrient for plants, animals, and humans. However, high concentrations of boron are harmful to animals and plants. A magnesium-aluminum-cerium hydrotalcite (Mg-Al-Ce-HT) was successfully prepared by the co-precipitation method for boron removal. Different analyses were conducted to confirm the structure and characteristics of Mg-Al-Ce-HT. Adsorption efficiency of Mg-Al-Ce-HT was studied as a function of initial pH, amount of adsorbent, concentration of initial boric acid, and contact time. The pH of the solution had a negligible effect on boron sorption when pH was less than 8.0. However, the adsorption capacity decreased when the pH exceeded 8.0. The optimum amount of the adsorbent was 200 mg, and the maximum adsorption capacity was 32.52 mg·g ^-1. Boron removal reached equilibrium at 160 min. The thermodynamic parameters revealed that the adsorption was a non-spontaneous and endothermic process. The data fitted well with the Langmuir model, which indicated that the process involved monolayer adsorption.

Key words: boron removal, hydrotalcite, adsorption

CLC Number:

TQ174

ZHANG Wei, LIU Chen, CHEN Yuantao, WU Wangsuo. Removal of Boron from Water by Mg-Al-Ce Hydrotalcite Adsorption[J]. Journal of Inorganic Materials, 2020, 35(3): 337-344.

Figures/Tables 12

Fig. 1 TG-DSC curve of Mg-Al-Ce-HT precursor

Fig. 2 XRD patterns of Mg-Al-Ce precursor (a), Mg-Al-Ce-HT before adsorption (b), and Mg-Al-Ce-HT after adsorption(c)

Fig. 3 FT-IR spectra of Mg-Al-Ce-HT precursor (a); Mg-Al-Ce-HT materials (b) and adsorbed materials (c)

Fig. 4 SEM images of Mg-Al-Ce-HT (a) and EDS analysis of Mg-Al-Ce-HT (b) and the corresponding EDS mappings of O (c), Mg (d), Ce (e), and Al (f) elements

Scheme 1 Schematic of the B(OH)3 adsorption process on the surface of Mg-Al-Ce-HT material(a), and XPS patterns of full elemental spectrogram (b)

Fig. 5 XPS spectra of Mg 2p, Al 2p, Ce 3d, C 1s, and O 1s in Mg-Al-Ce-HT before and after adsorption

Fig. 6 Effect of initial pH on adsorption efficiency (a) and the relationship between the conversion of H3BO3 and B(OH)4- (b)

Fig. 7 Effect of adsorbents, adsorption percentages, and adsorption capacity

Fig. 8 Effect of initial concentration of boric acid (a) and the Langmuir model (b)

Fig. 9 Effect of contact time on boron adsorption and kinetics model

Fig. 10 Van’s Hoff plot of boron adsorption on Mg-Al-Ce-HT

T/K	ΔG^θ/ (kJ· mol^-1)	ΔH^θ/ (kJ·mol^-1)	ΔS^θ/ (kJ· mol^-1·K^-1)	R²
308	12.16	89.90	0.25	0.99
313	10.90
323	8.37

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