Abstract

Through adjusting the pH of the silver ammonia solution (Ag(NH₃)₂OH), different microstructure of silver phosphate (Ag₃PO₄) was prepared via simple precipitation method. The effect of pH on the microstructure and photocatalytic properties was studied. Preliminary results indicate that the pH of silver ammonia solution played a key role in crystal growth and microstructure of Ag₃PO₄. When the pH is 9, the preferential crystal growth of the Ag₃PO₄ oriented along the (1 1 0) crystal surface. Thus, the cubic Ag₃PO₄ shows excellent photocatalytic properties. Based on the Ostwald’s ripening rule, a possible formation mechanism of cubic Ag₃PO₄ was proposed.

摘要

通过调节氨水银（Ag（NH ₃）₂ OH）的pH值，通过简单的沉淀法制备了不同微观结构的磷酸银（Ag ₃ PO ₄）。研究了pH对微结构和光催化性能的影响。初步结果表明，银氨溶液的pH值对Ag ₃ PO _4的晶体生长和微观结构起关键作用。当pH为9时，沿（1 1 0）晶体表面取向的Ag ₃ PO ₄的优先晶体生长。因此，立方Ag ₃ PO ₄显示出优异的光催化性能。根据奥斯特瓦尔德的成熟规律，提出了可能的立方Ag ₃ PO ₄形成机理。