Citation: Cinnasamy Banupriya, Krishnan Srinivasan, Aruliah Rajasekar, Kadarkarai Murugan, Benelli Giovanni, Kannaiyan Dinakaran. Organic-inorganic hybrid fluorescent sensor thin films of rhodamine B embedded Ag-SBA15 for selective recognition of Hg (Ⅱ) ions in water[J]. Chinese Chemical Letters, ;2017, 28(7): 1399-1405. doi: 10.1016/j.cclet.2017.01.018 shu

Organic-inorganic hybrid fluorescent sensor thin films of rhodamine B embedded Ag-SBA15 for selective recognition of Hg (Ⅱ) ions in water

a.
Department of Chemistry, Thiruvalluvar University, Vellore, 632 115, India
b.
Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India
c.
Department of Zoology, Bharathiar University, Coimbatore, 641 046, India
d.
Department of Agriculture, Food and Environment, University of Pisa, Pisa 56124, Italy
e.
TheBioRobotics Institute, Sant'Anna School of Advanced Studies, Pontedera 56025, Italy

Corresponding author: Kannaiyan Dinakaran, kdinakaran.tvu@gmail.com
Received Date: 13 September 2016
Revised Date: 2 November 2016
Accepted Date: 25 November 2016
Available Online: 20 July 2017

Figures(10)

Nowadays, the rapid and effective detection of low doses of heavy metal pollutants in contaminated water is a timely challenge in environmental pollution research. In this study, a rapid and highly sensitive assay for the detection of Hg²⁺ based on quenching of metal-enhanced fluorescence of rhodamine B (RB) has been fabricated. RB and silver nanoparticle were incorporated into the mesoporous siliceous framework spin cast on a quartz glass through post-synthetic incorporation method. The morphology and crystallinity of mesoporous structure and Ag nanoparticle were characterized by transmission electron microscopy and X-ray diffraction analyses. Photoluminescence assays on the hybrid thin film of RB-Ag-SBA15 showed a high enhancement when compared to the intensity of silver free SBA15-RB in the wavelength of 575 nm. The fluorescence of RB-Ag-SBA15 thin film decreased gradually with the increase in the concentration of Hg²⁺ and the detection limits were 10.54 nmol/L. Furthermore, the fluorescence intensity increased linearly with the concentration of Hg²⁺ in the range from 1.0×10^-8 mol/L to 1.0×10^-8 mol/L, with a response time of a few seconds. In addition, this system offers a high selectivity over interfering cations such as Cd²⁺ and Pb²⁺. Overall, we have developed an optical assay having a wellordered mesoporous SBA15 containing Ag-RBfor selective detection of Hg²⁺ in aqueous solution. The scheme combines the advantages of specific binding interactions between Hg²⁺ and RB molecule and optical emission properties of RB. The method is suitable for a single-shot and irreversible analytical assay in a quartz glass/microtiter plate.
- Mercury sensor,
- Metal enhanced fluorescence,
- Rhodamine B,
- Ag nanoparticles,
- SBA15,
- Fluorescence quenching
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