Analytical application of polyurethane foam functionalized with quinolin-8-ol for preconcentration and determination of trace metal ions in wastewater

Quinolin-8-ol-bonded polyurethane foam (Ox-PUF) was synthesized by coupling 
the polyurethane foam matrix with oxine through an azo (-N= N-) group. The 
chromatographic retention behavior of Ag+, Pb 2+, and Al 3+ onto the Ox-PUF was studied. 
The extraction of Ag+, Pb 2+, and Al 3+ was accomplished within 15–20 min at pH ranges of 
1–4, 4–6, and 6–12, respectively. The kinetics and thermodynamics of the sorption of tested 
metal ions onto Ox-PUF have been studied. The average values of ΔH, ΔS, ΔG; k 1, k− 1, k ...