Optimization and characterization of a castor oil (Ricinus communis L.)- and 1,10-phenanthroline-based polyurethane membrane for Al3+ ion-selective applications

W4415116860 · 수집 2026-10-04 18:16:49

T10409 Analytical Chemistry and Sensors

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Ion-selective membrane technology is a key for accurately measuring specific ions in different solutions. A study on Al3+ ion selective electrodes (ISEs) based on polyurethane (PU) membranes using an active substance, i.e., 1,10-phenanthroline, was successfully conducted. The results showed the highest sensitivity and linear range with a PU membrane composition of castor oil, toluene diisocyanate, 1,10-phenanthroline, and acetone in the ratio of 37.80 : 18.90 : 43.20 : 0.10 (%w/w) and internal solution composition 0.1 : 0.1 (M) of KCl and Al(NO3)3 Fourier transform infrared (FTIR) analysis indicated the presence of urethane bonds at a wavenumber of 3390 cm-1. 1,10-Phenanthroline aromatic C[double bond, length as m-dash]C and C-N functional group peaks appeared at wavenumbers of 1600 cm-1 and 1325 cm-1, respectively. X-ray diffraction (XRD) characterization suggested a decrease in the degree of crystallinity of PU, PU/Phen membranes, and PU/Phen/Al. Scanning electron microscopy (SEM) analysis showed that the PU/Phen/Al membrane had a homogeneous dense outer layer and tended to be porous in the inner layer, and the Al3+ ISE system showed an average sensitivity, linear range, and detection limit of 19.94 ± 0.26 mV/decade, 10-10-10-4 M (R 2 = 0.998), and 5.17 × 10-12 M, respectively. Furthermore, the ISE had a response time of 180 s, was stable in the pH range of 6-8 and allowed 33 days of use without any interference from foreign ions. The recovery was in the range of 99.21-101.57%. Therefore, the prepared PU/Phen/Al membrane is promising for ISE sensors, especially for the detection of Al3+ ions.

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Optimization and characterization of a castor oil (<i>Ricinus communis</i> L.)- and 1,10-phenanthroline-based polyurethane membrane for Al<sup>3+</sup> ion-selective applications

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