2.1. Hendrik - ARTIKEL: Enhanced Detection

Siti Maryam Jasman and Hendrik O. Lintang and Leny Yuliati (2017) 2.1. Hendrik - ARTIKEL: Enhanced Detection. Macromolecular Symposia, 371 (1). pp. 84-93. ISSN 1022-1360

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/masy.20...


Nitrogen containing compounds such as nitrite ions (NO� 2 ) may cause contaminations to the environment, food and drinking water, and they have a negative effect on human health. In this study, a novel fluorescence sensor was developed by modification of polymeric carbon nitride (CN) with copper(II)acetylacetonate (Cu(acac)2). The polymeric CN was prepared by using urea as a precursor via thermal polymerization technique, while the Cu(acac)2 was introduced onto the polymeric CN via an impregnation method. The formation of polymeric CN can be confirmed from the Fourier transform infrared (FTIR) and the diffuse reflectance ultraviolet visible (DR UV-Vis) spectroscopies. The polymeric CN exhibited three excitation peaks at 277, 315, and 370 nm owing to the presence of C¼N, C¼O, and C—N groups, respectively, while there was only one emission peak observed at 455 nm. The emission intensity was decreased with the increase of Cu(acac)2 loading, suggesting certain interactions between the polymeric CN and the added Cu(acac)2. The performances of the polymeric CN and Cu(acac)2/CN composites as fluorescence sensors were evaluated for NO^2 detection with concentration range of 0.5-4 mM. It was revealed that the C¼N sites in the polymeric CN were the most favored quenching sites for the NO^2 . With the addition of Cu(acac)2 (0.1 mol%), the quenching rate for C¼N sites was enhanced two times higher than that of the polymeric CN. This study demonstrated that the composite is a promising fluorescence sensor for the detection of NO^2.

Item Type: Article
Subjects: Q Science > QD Chemistry
Depositing User: Administrator Ma Chung
Date Deposited: 11 Nov 2017 22:08
Last Modified: 11 Nov 2017 22:17
URI: http://eprints.machung.ac.id//id/eprint/29

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