Mechanism of formation of metal sulfide ultrafine particles in reverse micelles using a gas injection method
Mechanism of formation of metal sulfide ultrafine particles in reverse micelles using a gas injection method
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气体注射法反胶束中金属硫化物超细颗粒的形成机理
DOI：
10.1021/ie9601413
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
I. Komasawa
中科院分区：
文献类型：
--
作者：
Hiroshi Sato;Yoritaka Tsubaki;T. Hirai;I. Komasawa
研究了H2 S注入反胶束体系中形成CdS、ZnS超细微粒及其复合微粒的机理。紫外-可见吸收光谱的变化跟踪粒子的形成过程。从生成颗粒的大小和数量随时间的变化分析了硫化氢溶解、成核、颗粒生长和凝聚的动力学过程。H{sub 2}S的溶解是主要的速率控制步骤，并且大部分溶解的H{sub 2}S被消耗用于颗粒生长。在大多数情况下，在本气体注入方法中形成的颗粒的尺寸大于在先前的溶液混合方法中形成的颗粒的尺寸。提出了一个基于胶束间物种分布的动力学模型，成功地解释了粒子的生长。还制备了具有混晶或核-壳结构的CdS和ZnS的复合颗粒，然后研究了这些颗粒作为光催化剂用于水裂解生成H{sub 2}的应用。
The mechanism of formation of ultrafine CdS, ZnS, and their composite particles by the injection of H{sub 2}S into reverse micelles was studied. The particle formation process was followed by the change in UV-visible absorption spectra. The kinetics of the whole process including dissolution of H{sub 2}S, nucleation, particle growth, and coagulation was analyzed from time-course changes of the size and number of formed particles. The dissolution of H{sub 2}S was the principal rate-determining step, and most of the dissolved H{sub 2}S was consumed for particle growth. The particles formed in the present gas injection method were larger in size than those in the previous solution-mixing method in most cases. A kinetic scheme based on the distribution of the species among the micelles was then proposed, and this successfully explained the particle growth. Composite particles of CdS and ZnS having mixed crystal or core-shell structures were also prepared, and the application of these particles as photocatalysts for the cleavage of water to generate H{sub 2} was then investigated.