Table 3. Fluorescence Quantum Yield (Φf) and Fluorescence Lifetime (τ) of Acr with and without Clays in Watera.
quantum
yield |
fluorescence lifetime/ns |
||||||
---|---|---|---|---|---|---|---|
compound | clay minerals | ΦfW | ΦfC | ΦfC/Φf | τW | τC | τC/τW |
Acr+ | Sap1.2 | 0.173 | 0.072 | 0.42 | 30.2 | 28.2 | 0.93 |
PhAcr+ | Sap1.0 | 0.0065 | 0.118 | 18.1 | 1.55 | 14.5 | 9.4 |
PhAcr+ | Sap1.2 | 0.0065 | 0.137 | 21.1 | 1.55 | 15.8 | 10.2 |
PhAcr+ | Sap1.4 | 0.0065 | 0.144 | 22.2 | 1.55 | 15.1 | 9.7 |
PhAcr+ | Sap1.6 | 0.0065 | 0.148 | 22.3 | 1.55 | 16.1 | 10.4 |
ΦfW and Φf are the Φf values of Acr in water and on the clay surface, respectively. τW and τC are the τ values of Acr in water and on the clay surface, respectively.