Fig. 7

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