Synthesis of β-type Strontium Hydrogen Phosphate Nanosheets and Its Immobilization of Pb2+ in Acidic Aqueous Solution

doi:10.1007/s40195-015-0214-z

Abstract

Abstract:

Highly crystalline β-type strontium hydrogen phosphate (β-SrHPO₄) nanosheets were prepared by a hydrothermal method and used for the immobilization of lead ions (Pb²⁺) from acidic aqueous solution. The effects of various parameters on the immobilization process, including solution pH value, contact time, initial ion concentrations, and coexistent competing cations, were studied to optimize the conditions for maximum immobilization. The β-SrHPO₄ nanosheets exhibited a capacity of (1,120 ± 22) mg/g toward Pb²⁺ in acidic solution (pH value is 3.0), and the equilibrium was achieved within 8 min. The competing cations such as Cu²⁺, Zn²⁺, Cd²⁺, and Co²⁺ affected slightly on the selective immobilization of Pb²⁺. The results revealed that the removal mechanism of Pb²⁺ by the β-SrHPO₄ nanosheets was the dissolution/precipitation process in the acidic solution.

Key words: Strontium hydrogen phosphate, Nanosheets, Immobilization, Lead ions, Dissolution/precipitation

Fu-Qiang Zhuang, Rui-Qin Tan, Wen-Feng Shen, Xian-Peng Zhang, Wei Xu, Wei-Jie Song. Synthesis of β-type Strontium Hydrogen Phosphate Nanosheets and Its Immobilization of Pb²⁺ in Acidic Aqueous Solution[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(4): 438-443.

Figures/Tables 7

Fig. 1 Characterization of the pristine β-SrHPO4 nanosheets: a XRD pattern; b, c SEM images; d TEM image

Fig. 2 Effect of pH value on the uptake of Pb2+ by β-SrHPO4 nanosheets

Fig. 3 Immobilization curves of Pb2+ immobilized on 50 mg β-SrHPO4 nanosheets in 50 mL Pb2+ solution at 30 °C and pH value of 3.0: a kinetics curve, start concentration of Pb2+ is 2,000 mg/L; b isotherm curve, time is 60 min

Table 1 Comparison of Pb2+ removal capacity using β-SrHPO4 nanosheets with that of other materials

Materials	q _max (mg/g)	pH value	Ref.
Carbonate hydroxyapatite	101	5.0	[14]
Natural phosphate/activated phosphate	115.34/155.04	3.0	[15]
Low-crystallinity hydroxyapatite	506	5.8	[16]
Ca-HA	750	5.0-6.0	[17]
Calcium hydroxyapatite (HAp)	450	3.0-5.0	[18]
Keratin colloidal solution,	43.3	5.0	[19]
Hydroxyapatite	357.14	6.0	[20]
β-SrHPO₄	1,120	3.0	This work

Fig. 4 Effects of coexisting ions on the uptake of Pb2+ by β-SrHPO4 nanosheets

Fig. 5 Characterization of the precipitation after Pb2+ immobilization experiments: a SEM images; b EDX result; c XRD pattern

Fig. 6 Evolution of pH value during Pb2+ immobilization by β-SrHPO4 nanosheets

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Synthesis of β-type Strontium Hydrogen Phosphate Nanosheets and Its Immobilization of Pb²⁺ in Acidic Aqueous Solution

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