Insight into the adsorption of doxycycline hydrochloride on different thermally treated hierarchical CoFe2O4/bio-silica nanocomposite
[Display omitted] •Synthesis and calcination of novel CoFe2O4/bio-silica nanocomposite.•Adsorption mechanism of doxycycline (DOX) not limited to electrostatic interaction.•Energy-filtered-TEM (EFTEM) and TGA analysis confirmed the adsorption of doxycycline hydrochloride.•Adsorption capacity of 835.4...
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Published in | Journal of environmental chemical engineering Vol. 7; no. 6; p. 103442 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.12.2019
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•Synthesis and calcination of novel CoFe2O4/bio-silica nanocomposite.•Adsorption mechanism of doxycycline (DOX) not limited to electrostatic interaction.•Energy-filtered-TEM (EFTEM) and TGA analysis confirmed the adsorption of doxycycline hydrochloride.•Adsorption capacity of 835.47 mg g−1 was obtained by the as-prepared nanocomposite.•DOX-loaded adsorbent was desorbed by thermal treatment.
The removal of doxycycline hydrochloride (DOX), a widely used antibiotic, from wastewater by novel CoFe2O4/rice husk silica nanocomposite was studied. The adsorbent was synthesized through co-precipitation of iron and cobalt salt mixed with a solution of rice husk silica, whose precipitate was dried in an oven at 100 °C and calcined at 300, 500 and 700 °C. Characterization of the adsorbents showed that calcination did not affect their morphology, although the specific surface area and diffractogram of the nanocomposite were significantly affected at calcination temperature of 700 °C. The as-prepared nanocomposite has the highest surface area (283 m2 g−1). The adsorption studies revealed that the synthesized nanocomposite is an excellent material for the removal of DOX. The mechanism of adsorption entails electrostatic and n- π interaction. Adsorption data fitted well with Langmuir isotherm, having the monolayer adsorption capacity of 835.47 and 581.44 mg g-1 for the as-prepared and sample calcined at 700 °C, respectively. The removal of DOX is entropy driven, spontaneous in nature and confirmed by TGA and EFTEM analysis. |
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ISSN: | 2213-3437 2213-3437 |
DOI: | 10.1016/j.jece.2019.103442 |