The evaluation of the association constant between R-SN and Hg2+ |
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Authors: | Jian-she Tang Li Xiang Hai-zhou FAN |
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Institution: | 1. School of Environment and Energy Engineering, Anhui Jianzhu University, 292 Ziyun Road, Hefei, 230601, People’s Republic of China 2. School of Law and Political Science, Anhui Jianzhu University, Hefei, 230601, People’s Republic of China
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Abstract: | The effective determination of heavy metals from environmental media is among the most important issues for many industrialized countries. The interaction between RS-N, as novel heavy metal probe, and metal ions was studied. RS-N shows selective color change from colorless to pink in the presence of Hg2+ in methanol/water solvent and the UV–Vis study shows peak at 560 nm. Fluorescence data revealed that the fluorescence enhance of RS-N by Hg2+ dramatically was the result of the formation of Hg2+]RS-N complex. The effective association constants (K a ) were 3.97?×?105 and 0.204?×?105 M?1 for Hg2+ and Cu2+ to RS-N, respectively. The thermodynamic parameters, enthalpy change (ΔH 0) and entropy change (ΔS 0), were calculated to be ?6.431?±?0.226 kJ/mol and ?0.129?±?0.008 J/K/mol, respectively, according to van’t Hoff equation on the basis of Gibbs free energy (ΔG 0) ranged from ?33.8326 to ?28.5389 kJ/mol. |
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