Synthesis of β-cyclodextrin functionalized gold nanoparticles for the selective detection of Pb2＋ ions from aqueous solution

• Published in: Frontiers of materials science 2012-06, Vol.6 (2), p.168-175
• Main Authors: Aswathy, B., Avadhani, G. S., Suji, S., Sony, G.
• Format: Article
• Language: English
• Subjects: Chemistry and Materials Science; Materials Science; Research Article; 功能化; 合成; 水溶液; 环糊精; 聚集行为; 选择性检测; 金纳米粒子; 铅离子
• ISSN: 2095-025X; 2095-0268
• DOI: 10.1007/s11706-012-0165-5

In the present study we carried out the synthesis of β-cyclodextrin （β-CD） functionalized gold nanoparticles （AuNPs） using a microwave assisted heating method in alkaline media. Stable dispersion of β-CD stabilized AuNPs was obtained at an optimized pH of 10,5. At this pH value the deprotonated secondary hydroxyl group of β-CD shows the highest chelating affinity toward Pb2＋ ions thereby inducing AuNP aggregation. The Pb2＋ induced aggregation in β-CD-AuNP solution is monitored by both colorimetric response and UV-Vis spectroscopy. TEM, DLS and FTIR analyses were carried out to confirm the Pb2＋ ion induced aggregation behaviour of β-CD-AuNPs under alkaline conditions. Furthermore at the experimental pH the response of the β-CD-AuNP system towards Pb2＋ ions is selective when compared with other interfering metal cations.