Intercalation of α,ω-Alkyldiamines into Layered α-Titanium Phosphate from Aqueous Solutions

Facile Synthesis of Poly(vinyl alcohol)/α-Titanium Phosphate Nanocomposite with Markedly Enhanced Properties

“…28,29 In the spectrum of MEA-TiP, the peaks at 3550 and 3480 cm À1 corresponding to PÀOH are no longer visible, replaced by a broad band at 2200À3700 cm À1 that might be due to the overlapped absorptions of ammonium, ÀCH 2 , ÀOH, and hydrogen bonds, indicating that PÀOH became PÀO À + NH 3 ÀC 2 H 5 OH. 25,26,30,31 In the spectrum of PVA, there is a broad and strong absorption at 3000À3700 cm À1 , peaking at 3377 cm À1 , which is due to the symmetrical stretching vibration of hydroxyl groups in PVA. The peaks at 2800À3000 cm À1 are due to ÀCH 2 , and that at 1645 cm À1 can be assumed to be the hydroxyl bending vibration.…”

“…The interlayer d spacing of α-TiP is increased when intercalated by agents such as monoethanolamine. − XRD was performed to investigate the crystal structure and d spacing of TiP (Figure ). The [002] reflection of α-TiP was located at 11.8°, giving a d spacing of 0.76 nm.…”

“…The peaks at 900–1300 cm –1 and below 650 cm –1 are assigned to the symmetrical stretching vibration of PO 3 . The peak at 970 cm –1 is assignable to the stretching modes of P–O, and that at about 750 cm –1 corresponds to nonbridging oxygen Ti–O bond vibrations. , In the spectrum of MEA-TiP, the peaks at 3550 and 3480 cm –1 corresponding to P–OH are no longer visible, replaced by a broad band at 2200–3700 cm –1 that might be due to the overlapped absorptions of ammonium, −CH 2 , −OH, and hydrogen bonds, indicating that P–OH became P–O –+ NH 3 –C 2 H 5 OH. ,,, In the spectrum of PVA, there is a broad and strong absorption at 3000–3700 cm –1 , peaking at 3377 cm –1 , which is due to the symmetrical stretching vibration of hydroxyl groups in PVA. The peaks at 2800–3000 cm –1 are due to −CH 2 , and that at 1645 cm –1 can be assumed to be the hydroxyl bending vibration.…”

“…As a type of alkylamine, MEA has an amine group and a hydroxyl group in each molecule. The amine groups can react with the P–OH groups in α-TiP, forming protonized ammonium, swelling the α-TiP platelets, and thereby increasing the d spacing. , The hydroxyl groups preserve the physical and chemical properties of α-TiP nanolayers.…”

Flow Injection Photoamperometric Investigation of Ascorbic Acid Using Methylene Blue Immobilized on Titanium Phosphate

“…These observations predicted that NH 2 groups easily interacted with the interlayer and surface of phosphates. The adsorption of amines by layered phosphates may be considered as an acid-base topotactic solidstate reaction between a layered acid host and a Brönsted base guest (Espina et al 1998). The TiP has many P-OH groups and these acidic O-H groups interacted with basic -NH 2 groups.…”