Fabrication, Microstructure and Colloidal Stability of Humic Acids Loaded Fe3O4/APTES Nanosorbents for Environmental Applicationsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 июля 2021 г.
Аннотация:Nowadays, numerous researches are being performed to formulate nontoxic multifunctional magnetic materials possessing both high colloidal stability and magnetization, but there is a
demand in the prediction of chemical and colloidal stability in water solutions. Herein, a series of
silica-coated magnetite nanoparticles (MNPs) has been synthesized via the sol-gel method with and
without establishing an inert atmosphere, and then it was tested in terms of humic acids (HA) loading
applied as a multifunctional coating agent. The influence of ambient conditions on the microstructure,
colloidal stability and HA loading of different silica-coated MNPs has been established. The XRD
patterns show that the content of stoichiometric Fe3O4 decreases from 78.8% to 42.4% at inert and
ambient atmosphere synthesis, respectively. The most striking observation was the shift of the MNPs
isoelectric point from pH ~7 to 3, with an increasing HA reaching up to the reversal of the zeta
potential sign as it was covered completely by HA molecules. The zeta potential data of MNPs can
be used to predict the loading capacity for HA polyanions. The data help to understand the way
for materials’ development with the complexation ability of humic acids and with the insolubility
of silica gel to pave the way to develop a novel, efficient and magnetically separable adsorbent for
contaminant removal.