Surface characterization of di-(2-ethylhexyl)dithiophosphoric acid-activated composite membranes by X-ray photoelectron spectroscopy

María Jesús Ariza, Enrique Rodríguez-Castellón, Rodrigo Rico, Juana Benavente, María Muñoz, Maria Oleinikova

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15 Citations (Scopus)

Abstract

Surface chemical characterization of a set of activated composite membranes containing different concentrations of di-(2-ethylhexyl)dithiophosphoric acid (DTPA) as carrier was performed by x-ray photoelectron spectroscopy (XPS). As a result of the addition of DTPA to the membrane samples, the N 1s signal intensities decrease, whereas the P 2p signal intensities increase with increasing carrier concentration. Upon acid addition, the polyamide component of the membrane was protonated and a new peak at higher binding energies was observed in the N 1s XPS signal, due to the increase of the positive charge of these protonated nitrogen atoms. The S 2p signals indicate the coexistence of two contributions assigned to the presence of the acid carrier ionically bonded to the protonated amide and to free acid molecules.
Original languageEnglish
Pages (from-to)430-433
JournalSurface and Interface Analysis
Volume30
Issue number1
DOIs
Publication statusPublished - 1 Aug 2000

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