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Synthesis and characterization of feed grade monocalcium phosphate, Ca(h2po4)2·H2O in aqueous medium

The feed grade monocalcium phosphate monohydrate, Ca(H2PO4)2·H2O was prepared by the reaction of CaCO3 and H3PO4 at elevated temperature in aqueous solution. The obtained precipitates were characterized by powder X-ray diffraction, infrared spectroscopy (FTIR), and thermal analysis (TG, DTA) techniques. The chemical composition of final products was evaluated by analysing the phosphorus and calcium content in the samples. | Journal of Science and Technology 54 (4A) (2016) 7-14 SYNTHESIS AND CHARACTERIZATION OF FEED GRADE MONOCALCIUM PHOSPHATE, Ca(H2PO4)2·H2O IN AQUEOUS MEDIUM Nguyen Quang Bac*, Ta Hong Duc School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi * Email: bac.nguyenquang@hust.edu.vn Received: 15 August, 2016; Accepted for publication: 5 October 2016 ABSTRACT The feed grade monocalcium phosphate monohydrate, Ca(H2PO4)2·H2O was prepared by the reaction of CaCO3 and H3PO4 at elevated temperature in aqueous solution. The obtained precipitates were characterized by powder X-ray diffraction, infrared spectroscopy (FTIR), and thermal analysis (TG, DTA) techniques. The chemical composition of final products was evaluated by analysing the phosphorus and calcium content in the samples. Keywords: monocalcium phosphate monohydrate, aqueous medium, feed grade. 1. INTRODUCTION The compounds in the CaO–P2O5–H2O system have been investigated extensively for rather long period of time. Some of them are mainly used as bone substitutes in the biomedical industry due to their biocompatibility, low density, chemical stability, as well as high wear resistance [1]. Calcium phosphates with their characteristics of being light in weight, chemically stable and compositionally similar to the mineral phase of the bone are preferred as bone graft materials in hard tissue engineering. In addition to dicalcium phosphate, monocalcium phosphate is also used as the food additive for animals. It supplies both phosphorus and calcium which are indispensable for the growth of various types of animals. Inorganic P, and Ca sources are used as a supplement to organic feedstuffs to obtain the required level of P and Ca for optimum production and bone mineralisation [2]. The previous preparation methods of these calcium phosphate ceramics include precipitation method [3, 4], hydrothermal and or solvothermal reactions [1, 2, 5], structural directing agent (templated) .