Ultrasound-induced formation and dissolution of colloidal CdS

被引:58
作者
Sostaric, JZ [1 ]
CarusoHobson, RA [1 ]
Mulvaney, P [1 ]
Grieser, F [1 ]
机构
[1] UNIV MELBOURNE,SCH CHEM,ADV MINERAL PROD RES CTR,PARKVILLE,VIC 3052,AUSTRALIA
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1997年 / 93卷 / 09期
关键词
AQUEOUS-SOLUTION; SONOLYSIS; PARTICLES; CLUSTERS; WATER;
D O I
10.1039/a608567i
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The sonochemical formation of Q-state CdS colloids and the dissolution of larger colloidal CdS particles are described. In systems containing mercaptopropionic acid, the action of ultrasound produces H2S and in the presence of Cd2+(aq) ions, colloidal CdS is formed. The mechanism for the production of H2S appears to be predominantly H-atom attack on the thiol group of the mercaptan, although there is evidence that the local heating from ultrasound also contributes to H2S formation. The colloid particles produced by the ultrasound process clearly show quantum size effects and are estimated to be less than 3 nm in diameter. The dissolution of colloidal CdS at pH 10.5 appears to be due to the reaction of H2O2 and O-2(-) with the colloids. It has been found that the reaction can be inhibited by the addition of Na2S to the colloidal solution. Results also show that the reactions involved in the presence of Na2S are complex and that sulfur oxyanions most likely partake in the overall scheme once they are formed.
引用
收藏
页码:1791 / 1795
页数:5
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