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《Journal of Instrumental Analysis》 2008-07
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Study and Application of Photochemical Deposition of Silver on the Surface of TiO2 by Piezoelectric Quartz Crystal

ZHU De-rong1,SUN Hui2,PAN Wen-long3,CHEN Yong3(1.Faculty of Pharmacy,Guangdong Medical College,Guangzhou 510275,China;2.Department of Chemistry,Anshan Normal College,Anshan 114005,China;3.Guangdong Key Laboratory of Chemical Emergency Test,China National Analytical Centre(Guangzhou),Guangzhou 510070,China)  
Based on piezoelectric quartz crystal(PQC) technology,the photochemical deposition processes and the mechanism of Ag on TiO2 modified PQC electrode have been studied in detail.The PQC electrode was used for the determination of cyanide at trace levels in water.The freshly produced metallic Ag reacts with cyanide showing improved performance(strengthen the detection signal three times)as comparing to the bulk Ag-coating PQC.The frequencies shifts were measured with results showing a linear relationship within the cyanide concentrations from 0.1-10 μmol/L.The detection limit(2.2 μg/L)was found to be 1-2 orders of magnitude lower than the World Health Organization(WHO) guideline value for drinking water.Effects of various factors including nano-sized silver particle dimension and film thickness,background buffer,solution pH and potential interferents in environmental water samples were investigated.Factors affecting the photo-chemical deposition process of Ag on TiO2 were also studied.
【Fund】: 广东省科技厅重点资助项目(2003C102006 2004B30101007)
【CateGory Index】: TP212.2
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