Mechanism of Potassium Acid Phthalate in Stimulating Formation of Magnesium Hydroxide Sulfate Hydrate Nanowires

doi:10.15541/jim20190020

Abstract

Abstract:

Magnesium hydroxide sulfate hydrate (MOS) nanowires were prepared with hydrothermal method by using potassium acid phthalate (KHpht) as the complexant. Complexation formed by pht ^2- and Mg ²⁺ in this preparation system was analyzed by potentiometric titration. The effect of pht ^2- adsorption on MOS nanowires was investigated by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FT-IR) and transmission electron microscopy (TEM). These results show that pht ^2- complexes with Mg ²⁺ in the reaction system substantially decreases free Mg ²⁺ concentration and solution supersaturation. Chemical bonding between Mg ²⁺ and pht ^2- exists on the surface of MOS crystal. Owing to the different configuration of the crystal lattice, pht ^2- adsorption on the lateral growth plane is more preferential than that on the axial growth plane, resulting in the formation with ratio of MOS nanowires.

Key words: magnesium hydroxide sulfate hydrate, nanowire, potassium acid phthalate, complexation

CLC Number:

O614

XIAO Jian-Fei, NAI Xue-Ying, GOU Sheng-Lian, YE Jun-Wei, DONG Ya-Ping, LI Wu. Mechanism of Potassium Acid Phthalate in Stimulating Formation of Magnesium Hydroxide Sulfate Hydrate Nanowires[J]. Journal of Inorganic Materials, 2019, 34(11): 1181-1186.

Figures/Tables 9

Fig. 1 XRD patterns of MOS whisker and nanowire

Fig. 2 SEM images of MOS whiskers (a, c) and MOS nanowires (b, d)

Fig. 3 Titration curves of KHpht and MgSO4-KHpht titrated with NaOH solution

Fig. 4 Ionization constant (a) and complexation stability constant (b) of Mgpht at 30 ℃

Fig. 5 Concentration of Mg2+ changed with pH (a) and pht2-/Mgpht (b) in slurry at 30 ℃

Fig. 6 FT-IR spectra of MOS nanowires and MOS whiskers

Fig. 7 XPS spectra of MOS nanowires and MOS whiskers (a) Full-scan; (b) Mg1s spectrum; (c) O1s spectrum; (d) S2p spectrum

Fig. 8 TEM (a), HRTEM (b) images and SADE patterns (c) of MOS nanowires

Fig. 9 Growth schematic of the MOS nanowire

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