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Magnetic solid phase extraction for chromatographic separation of carbamates
Author(s) -
Issa Ahmed A.,
AlSaad Khalid A.,
Luyt Adriaan S.
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15360
Subject(s) - magnetite , dispersity , magnetic nanoparticles , thermal decomposition , extraction (chemistry) , nucleation , phase (matter) , materials science , decomposition , magnetite nanoparticles , solid phase extraction , magnetic separation , analytical chemistry (journal) , chemical engineering , chemistry , nanoparticle , chromatography , nanotechnology , polymer chemistry , organic chemistry , metallurgy , engineering
Magnetic solid phase extraction particles ( MSPE ) were produced using magnetite nanoparticles with diameters between 9 and 13 nm as nucleating agent. The produced particles with magnetite cores were smaller, and more irregular and poly‐dispersed, than those produced in the absence of the magnetite particles. The average diameters of the particles were 377 and 521 nm, respectively, for silica particles with and without magnetic core, whereas the diameters of the different grafted particles were of the same order of magnitude than the silica particles with magnetic cores. BET results indicated surface areas ranging between 9 and 37 m 2 g −1 The TGA results showed that the particles contained about 10% water and other solvents, and between 5 to 6% grafted groups. The thermal decomposition of the particles (presented under Supplementary Information) was autocatalytic with activation energies of 367, 546, and 616 kJ mol −1 for particles grafted with cyanopropyl (cyano), octyl, and trimethyl ( TMS ), respectively. The order of dispersity of the particles in water followed the sequence cyano > PMA > TMS ≫ octyl, whereas the pesticides removing efficiency followed the reverse order.