El-Shahat M F, Moawed E A, Zaid M A A
Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
Anal Bioanal Chem. 2004 Jan;378(2):470-8. doi: 10.1007/s00216-003-2223-4. Epub 2003 Oct 16.
Polyurethane foam functionalized with 8-hydroxyquinoline has been prepared by coupling the foam matrix with 8-hydroxyquinoline (oxine) through an azo spacer. The oxine-bonded foam (Ox PUF) was characterized by use of different tools (UV-Vis spectra, IR spectra, density, and stability). Ox PUF was found to be very suitable for separation and preconcentration of trace metals, e.g. Zn(II), Cd(II), and Hg(II) ions, from wastewater in the pH ranges 2-12, 9-12, and 3-6, respectively. Various conditions influencing the sorption of these metal ions on to Ox PUF were optimized. Extraction of the metal ions was accomplished in 15 to 20 min. Study of the variation of the sorption of the tested metal ions with temperature yielded average values for DeltaH, DeltaS, and DeltaG of 41.99, 158.23, and -5.1 kJ mol(-1), respectively. The capacities of the foam material were 0.27, 0.16, and 0.09 mmol g(-1) for Zn(II), Cd(II), and Hg(II), respectively. Preconcentration factors >50 were achieved (RSD approximately 6.18). The quantitative results were obtained from experiments performed using certified reference materials.
通过偶氮间隔基将泡沫基质与8-羟基喹啉（8-羟基喹啉）偶联，制备了功能化的8-羟基喹啉聚氨酯泡沫。通过使用不同工具（紫外可见光谱、红外光谱、密度和稳定性）对8-羟基喹啉键合泡沫（Ox PUF）进行了表征。发现Ox PUF非常适合分别在pH范围为2-12、9-12和3-6的废水中分离和预富集痕量金属，例如Zn(II)、Cd(II)和Hg(II)离子。优化了影响这些金属离子在Ox PUF上吸附的各种条件。金属离子的萃取在15至20分钟内完成。研究测试金属离子的吸附随温度的变化，得到的ΔH、ΔS和ΔG的平均值分别为41.99、158.23和-5.1 kJ mol(-1)。泡沫材料对Zn(II)、Cd(II)和Hg(II)的容量分别为0.27、0.16和0.09 mmol g(-1)。实现了预富集因子>50（相对标准偏差约为6.18）。定量结果来自使用有证标准物质进行的实验。
