Polyethylenimine modified magnetic graphene oxide nanocomposites for Cu²⁺removal

• Key Words:Lead compounds;Bins - Fluorescence - Ions - Lead - Physiology - Solutions;Binding ratio - Fluorescenceprobe - Fluorescent chemosensor - Limit of detection - Linear response - Recognition process - Rhodamine 6G - Visual detection
• Abstract:A new selective fluorescent chemosensor based on rhodamine 6G derivative (R1) has been designed and synthesized, which displayed highly selective and sensitive detecting for lead ion in aqueous solution. Sensor R1 was selective toward Pb²⁺ion by a light yellow to pink change for the visual detection of Pb²⁺ion. The fluorescence recognition processes of Pb²⁺was based on a binding induced ring-opening from the spirolactam (nonfluorescent) to acyclic xanthenes (fluorescent). Sensor R1 was excited with a 1:1 binding ratio and the linear response in the range of 1.0 × 10^−8–1.0 × 10^−5 mol L^−1with the limit of detection of 2.7 × 10^−9 mol L^−1(3σ/slope). © 2017
• Volume:246
• Translation or Not:no