Amino-functionalized mesoporous silica-magnetic graphene oxide nanocomposites as water-dispersible adsorbents for the removal of the oxytetracycline antibiotic from aqueous solutions: adsorption performance, effects of coexisting ions, and natural organic matter

The amino-functionalized mesoporous silica-magnetic graphene oxide nanocomposite (A-mGO-Si) was synthesized and used for oxytetracycline (OTC) removal from water. Various factors like the effects of initial concentration, contact time, and influence of pH were investigated. Selective adsorption expe...

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Bibliographic Details
Published in:Environmental science and pollution research international 2020-02, Vol.27 (6), p.6560-6576
Main Authors: Prarat, Panida, Hongsawat, Parnuch, Punyapalakul, Patiparn
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Anti-Bacterial Agents
Antibiotics
Aquatic Pollution
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Bonding strength
Coexistence
Dissolved organic matter
Earth and Environmental Science
Ecotoxicology
Electrostatic properties
Environment
Environmental Chemistry
Environmental Health
Environmental science
Graphene
Graphite - chemistry
Humic acids
Hydrogen bonding
Hydrophobicity
Ions
Iron oxides
Magnesium
Magnetic Phenomena
Nanocomposites
Nanocomposites - chemistry
Oxytetracycline
Oxytetracycline - analysis
Oxytetracycline - chemistry
pH effects
Research Article
Selective adsorption
Silica
Silicon Dioxide
Tannic acid
Waste Water Technology
Water
Water Management
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water Pollution Control
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Summary:The amino-functionalized mesoporous silica-magnetic graphene oxide nanocomposite (A-mGO-Si) was synthesized and used for oxytetracycline (OTC) removal from water. Various factors like the effects of initial concentration, contact time, and influence of pH were investigated. Selective adsorption experiments in connection with coexisting ions and dissolved organic matter (DOM) were also investigated. In this study, humic acid (HA) and tannic acid (TA) were representative of both hydrophobic and hydrophilic DOM, respectively. Results indicated that A-mGO-Si had an adsorption ability for OTC that was relatively greater than that of virgin magnetic graphene oxide (mGO), graphene oxide (GO), Fe 3 O 4 particles, and SBA-15 mesoporous silica and also showed a better uptake removal capacity for OTC at low initial concentration in comparison with the other adsorbents. The adsorption behavior of OTC onto A-mGO-Si could be described by the pseudo-second-order kinetic model and the Freundlich isotherm model. The electrostatic interaction has no influence on the OTC absorbed when the OTC is in an aqueous medium in its zwitterion form (3.22 
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-019-07186-4