Rhodamine Derivative Functionalized Magnetic Nanoplatform for Cu²⁺ Sensing and Removal

Figure 4

(a) Photos of Fe₃O₄@SiO₂@P with (C–F) or without (A, B) Cu²⁺ under daylight (A, C, E) or UV-visible light (B, D, F) by using magnet (E, F) or no magnet (A–D); (b) photos of Fe₃O₄@SiO₂@P after the addition with various metal ions, respectively; (c) ion competition experiment of Fe₃O₄@SiO₂@P in the presence of 2.5 μM Cu²⁺, upon the background of various metal ions (2.5 μM).

(a)

(b)

(c)