Liquid-phase synthesis of magnesium phosphates in the presence of gallic acid

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Abstract

In aqueous solutions of magnesium chloride and sodium dihydrogen phosphate at Mg / P molar ratios of 1,0-1,5 and pH of 5-7 in the presence of gallic acid, crystalline hydrates of magnesium hydrophosphate (newberyte - MgHPO 4·3 H 2 O ) and orthophosphate ( Mg 3( PO 4)2·22 H 2 O ) were obtained, which after heating at 800°C transformed into pyrophosphates ( Mg 2 P 2 O 7). X-ray phase and thermal analysis methods, as well as infared spectroscopy, showed that the presence of an organic additive in the liquid-phase synthesis of magnesium phosphates does not lead to a noticeable change in the phase composition of the reaction products. It was revealed that gallic acid affects the formation of the structure of crystalline hydrates depending on the Mg / P molar ratio. It was found that with prolonged maturation of the sediments (over 6 months), the size of the unit cell of magnesium phosphates decreases. The obtained magnesium phosphate powders modified with gallic acid exhibit redox activity and are promising for use in biomaterials as resorbable components with antioxidant properties.

About the authors

Olga N. Musskaya

Institute of General and Inorganic Chemistry of the NAS of Belarus

Email: musskaja@igic.bas-net.by
Ph. D., Docent, Leading Researcher, Laboratory of Photochemistry and Electrochemistry

Valentina K. Krut'ko

Institute of General and Inorganic Chemistry of the NAS of Belarus

Ph. D., Docent, Head of the Laboratory of Photochemistry and Electrochemistry

Ilya E. Glazov

Institute of General and Inorganic Chemistry of the NAS of Belarus

Ph. D., Senior Researcher, Laboratory of Photochemistry and Electrochemistry

Eugene N. Krutsko

Institute of General and Inorganic Chemistry of the NAS of Belarus

Senior Researcher, Laboratory of Photochemistry and Electrochemistry

Anatoly I. Kulak

Institute of General and Inorganic Chemistry of the NAS of Belarus

Academician, Dr. Sc., Professor, Director of the Institute of General and Inorganic Chemistry of the NAS of Belarus

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