Microbially induced deposition of barium phosphates and its ingredient,morphology and size under different pH values

微生物诱导磷酸钡盐沉积及其不同pH值条件下的成份、形貌和尺寸（英文）

A phosphate-mineralization microbe was used to induce barium phosphates precipitation, and the precipitates with different types were obtained under different pH values. The average crystallite size of the barium phosphates was calculated by particle size distribution curves, and the size of the products was 33.40, 29. 37, 24. 13, 47.76 and 96. 53 μm when the pH values of the mixed solution are 7, 8, 9, 10 and 11, respectively. The results of X-ray diffraction （XRD） show that the structures of the particles controlled by the mixed solution are mainly BaaPO4 when pH 〈 10; the barium phosphates are synthesized by biological deposition which is the mixture of BaHPO4 and Ba5 （PO4）3OH when pH = 10; when pH = 11, the barium phosphates are also the mixtures, which are Ba5 （PO4）3OH and BaNaPO4. The above results indicate that the phosphate-mineralization microbe can produce a certain enzyme which constantly hydrolyzes phosphate monoester in the mixed solution, and then PO4^3- ions are obtained.

利用磷酸盐矿化菌诱导磷酸钡盐沉淀,并在不同pH值条件下赋予不同的形貌.通过粒径分布曲线计算磷酸钡盐的平均结晶尺寸,当细菌与混合溶液的pH为7,8,9,10和11时,对应产物的尺寸分别为33.40,29.37,24.13,47.76和96.53μm.X-射线衍射的结果表明:当pH<10时,混合溶液控制颗粒的主要成分为BaHPO_4.当pH=10时,生物沉积的磷酸钡盐主要成份为BaHPO_4和Bas(PO_4)_3OH的混合物.当pH=11时庄要为Ba_5(PO_4)_3OH和BaNaPO_4混合物.上述结果显示磷酸盐矿化菌可以产生特定的酶不断水解磷酸单酯,然后获得PO_4^(3-)离子.