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无机材料学报

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纺锤形α-Fe2O3成核前水解机理的研究

李巧玲1; 魏雨2; 李琳1   

  1. 1. 华南理工大学轻化工研究所, 广州 510640; 2. 河北师范大学化学系, 石家庄 050016
  • 收稿日期:1999-11-24 修回日期:1999-12-27 出版日期:2000-12-20 网络出版日期:2000-12-20

Hydrolysis Mechanism of Ellipsoidal α-Fe2O3 before Nucleation

LI Qiao-Ling1; WEI Yu2; LI Lin 1   

  1. 1.Light md. & Chem. Eng. Res. Inst.; South China Univ. of Tech.; Guangzhou 510640; China; 2. Chemistry Department; He Bet Normal University; Shijiazhuang 050016; China
  • Received:1999-11-24 Revised:1999-12-27 Published:2000-12-20 Online:2000-12-20

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摘要： 含有少量磷酸根的三价铁盐的水解机理是相当复杂的，这个过程可分为两个阶段，即：成核前的水解机理和成核后的水解机理．本文应用Ｆｅｒｒｏｎ逐时络合比色法研究了前一个阶段的水解机理．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．并根据三价铁回收曲线的形状间接确定了磷酸根的位置，阐明了为什么磷酸根的存在会对三价铁盐溶液的水解产生抑制作用，该结果对均匀纺锤形α－Ｆｅ２Ｏ３粒子的制备具有一定的指导意义．

关键词: 纺锤形α-Fe2O3, 水解机理

Abstract: The hydrolysis mechanism of Fe(III) solution is rather complicated when small amounts of phosphate ions are present. The process may be divided into two
stage, namely, before and after precipitation. The former was studied by Ferron-complex ion timed spectrophotometric method in this paper. The
method was used to classify the aqueous species of Fe(III) into three categories, i.e., Fe(a), Fe(b) and Fe(c), which represent their different exents of
hydrolysis and polymerization, respectively. The site of phosphate was indirectly defined by the shape of Fe(III) recovery curve. The
reason why the presence of phosphate can restrain the hydyolysis of Fe(III) solution is expounded. The result obtained has a specific signifitance
for guiding the synthesis of uniform and ellipsoidal hematite(α-Fe2O3) particles.

Key words: ellipsoidal α-Fe_2O_3 particles, hydrolysis mechanism

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