在高剪切結(jié)晶器中合成文石型納米碳酸鈣
[Abstract]:Using Ca (OH) _ 2-CO_2 as reactant system, phosphoric acid and polyacrylamide (PAM) as composite additives, the aragonite nano-calcium carbonate was successfully synthesized in a high shear mould. The crystal structure and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of the rotation speed of high shear mould and the amount of additives on the crystal shape and particle size of calcium carbonate were investigated. The results show that the purity of calcium carbonate is 98.1 and the average diameter is 50 nm, and the reaction time is only (1 / 6) ~ (1 / 3) of the conventional agitation reactor. The high shear mold has good micromixing performance and can effectively control the distribution of supersaturation in the mold during the reaction crystallization process, which is conducive to the formation of metastable aragonite. The compound additive of phosphoric acid and PAM plays an important role in the regulation of crystal shape and particle size. Hydroxyapatite was formed by the reaction of phosphoric acid with Ca (OH) _ 2. PAM plays an important role in the reduction of particle size and can prevent the crystal from growing along the radial direction and stabilize the metastable aragonite in the solution and prevent the agglomeration of the particles.
【作者單位】: 天津大學(xué)化工學(xué)院;
【分類號(hào)】:TB383.1;TQ132.32
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