A high-performance polyurethane sponge for the detection, adsorption and separation of Cu²⁺ ions

Abstract

The simultaneous detection and separation of copper ions is important. In this study, a fluorescent chemosensor (a copper sensitive molecule), was prepared using 6-bromo-benzo [de]isochromene-1,3-dione as a precursor. The as-prepared fluorescent molecule contains a hydroxyl group and an aminoquinoline moiety. The hydroxyl group enables the fluorescent molecule to anchor to a porous polyurethane (PU) sponge. The chemosensors still retained their recognition ability after they were introduced to PU. Upon the addition of Cu 2+ ions to the PU sponge, both the color and the fluorescence intensity changed, suggesting that the chemosensor-functionalized PU sponges could be used as a Cu 2+ ion sensor. The copper ions could also accumulate and be enriched on the sponges. The adsorption capacity of the PU sponge (containing 2 wt% of the chemosensor) reached 97.26 mg g À1 , which was higher than that of the solid PU membranes (52.62 mg g À1 ). These polymeric, highly sensitive chemosensors may potentially be applied in the detection of water pollution generated by sources such as electroplating and drain outflow.

A highly selective “turn-on” fluorescent chemosensor based on 8-aminoquinoline for detection of Zn2+

“…7, the uorescence intensity of the free HAQT showed a slight enhancement between pH 5 and 10, which may be attributed to the weak protonation or deprotonation reaction of the uorophore in neutral solution. 34 On the other hand, aer mixing with Zn 2+ , the emission intensity at 488 nm increased dramatically between pH 5 and 10, and had a stable uorescence response in the pH range of 6.0 to 8.5. However, at a pH higher than 8.5, the partial precipitation of ZnO might decrease the actual concentration of Zn 2+ , which might cause the decrease of uorescence intensity at 488 nm.…”

Multifunctional Polyurethane Sponge for Polymerase Chain Reaction Enhancement

“…[12][13][14][15] Although some work has been conducted in the past using superhydrophobic PU foam to recover different kinds of oils or chemical solvents from aqueous mixtures, to the best of our knowledge, the porous structural benefits of PU have rarely been applied in practical filtering of biomaterials including DNA and tissues. [17][18] Nevertheless, its hierarchical and high porosity with great mechanical durability make this material suitable for usage in both mechanical and chemical filters. 19,20 Moreover, easy surface modification of PU with both organic and inorganic materials helps to control of its wettability.…”

Novel Fluorescence Signal Magnified Chemosensors for Detection of Fe3+ and Hg2+ Ions

“…Fluorescent chemosensors, were chosen as one of the powerful methods to detect metal ions. Since fluorescent chemosensors show good recognition capability for metal ions with sensitive fluorescence change ,…”