【摘要】 含有少量磷酸根的三价铁盐的水解过程是相当复杂的 ,它可分为两个阶段 ,即 :成核前的水解机理和成核后的水解机理 .前一个阶段的水解机理可用Ferron逐时络合比色法进行研究 .此法把三价铁水解过程中的形态区分为Fe(a)、Fe(b)和Fe(c)三类 ,它们分别代表了三价铁盐水解产生的不同聚合度的聚合物 .后一个阶段的水解机理用磷钼蓝法、高倍透射电镜和XPS图谱等进行了探索 .结果表明 ,当含磷酸根的三价铁盐水解、聚合时 ,由于部分磷酸根可能被包裹于其中 ,因此成核速率和相转化速率大大降低 .更多还原

【Abstract】 The hydrolysis process of Fe(Ⅲ) solution is rather complicated when small amounts of phosphate ions are present. Two mechanisms can be used to describe the process, i.e., those before nucleation and after nucleation. The former was studied by the Ferron_complex ion timed spectrophotometric method and the aqueous species of Fe(Ⅲ) were classified into three categories, which represent respectively different polymers during hydrolysis. The latter was investigated by the phosphomolybdate blue method, high_resolution TEM and XPS spectrum. It was concluded that the rate of nucleation and the rate of phase transformation were decreased because some phosphate ions were possibly included in the polymer when the primary particles of α_Fe 2O 3 hydrolyzed and aggregated.更多还原