Fast Monitoring of the Phosphate Ions at Sub-mg L level with the Aim of Diamine-grafted MCM-41 Mesoporous silica and Ion Chromatography

Journal of Applied Chemical Research

مقاله 2، دوره 9، شماره 4، دی 2015، صفحه 19-29   

نوع مقاله: Research Paper

نویسندگان

Leila Hajiaghababaei^* ؛ Sima Djam

چکیده

In this work, an innovative method is described for the preconcentration of phosphate ions
using ethylenediamine functionalized mesopor (MCM-41). Functionalized MCM-41 was
synthesized and the presence of organic groups in the silica framework was demonstrated by
FTIR spectrum. The amount of organic groups immobilized on silica surface was determined
by elemental analysis and TGA. The functionalized product showed the BET surface area
804 m2g-1, BJH pore diameter 3.28 nm and pore volume 0.27 cm3g-1, based on adsorption-
desorption of N2at 77 K. The phosphate ions were identified by ion chromatography (IC). The
enrichment factor of the proposed method was 100 and detection limit was found to be 0.3μg L-1
. The time of extraction, pH, the optimum amount of the sorbent and amount of sodium
hydroxide solution for stripping were investigated. The maximum capacity the adsorbent was
found to be 12.0 (±1.4) μg phosphate/mg diamine-grafted MCM-41. The method was applied
successfully for the determination of trace amounts of phosphate ions in water samples.

کلیدواژه‌ها

Preconcentration, phosphate ions؛ diamine-grafted MCM-41؛ ion chromatography