Fig. 9

Fluorescence emission spectrum of SBA-Pr-Is-MN-DM dissolved in distilled water (0.2 g L⁻¹) in presence of the mixture of Fe³⁺ ions (200 µL × 10⁻² M) and several tested cations containing Pb²⁺, Hg²⁺, Cr³⁺, Ni²⁺, Zn²⁺, Cu²⁺, Co²⁺, Cd²⁺, Mn²⁺, Ca²⁺, K⁺, Al³⁺, Mg²⁺, Na⁺, and Fe²⁺ ions (200 µL of Mⁿ⁺ × 10⁻² M).