In situ synthesis of potassium tungstophosphate supported on BEA zeolite and perspective application for pesticide removal

Potassium tungstophosphate is supported on BEA zeolite by in situ synthesis for glyphosate removal. Spectroscopic measurements identified hydrogen bonding as a primal interaction of potassium salt and BEA zeolite. Composites are evaluated for glyphosate herbicide removal and adsorption process is an...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2019-07, Vol.81, p.136-147
Main Authors: Vasiljević, Bojana Nedić, Obradović, Milena, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, Jovanović, Zoran, Gavrilov, Nemanja, Holclajtner-Antunović, Ivanka
Format: Article
Language:English
Subjects:
Adsorption
Chemical synthesis
Composite materials
Glycine - analogs & derivatives
Glyphosate
Kinetics
Models, Chemical
Pesticides - chemistry
Potassium - chemistry
Ultrasonics
Zeolites - chemistry
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Summary:Potassium tungstophosphate is supported on BEA zeolite by in situ synthesis for glyphosate removal. Spectroscopic measurements identified hydrogen bonding as a primal interaction of potassium salt and BEA zeolite. Composites are evaluated for glyphosate herbicide removal and adsorption process is analyzed using two isotherm models. Obtained adsorption capacities for all prepared composites lay between 45.2 and 92.2 mg of glyphosate per gram of investigated composite. Suspension acidity revealed that glyphosate is adsorbed mainly in the zwitter-ion form at the composite surface while the amount of potassium salt in the composites is crucial for the adsorption application. Exceptional adsorption behavior is postulated to come from a high degree of homogeneity among surface active sites which is confirmed by different experimental methods. Temperature programmed desorption of glyphosate coupled with mass spectrometer detected one broad, high-temperature peak which represents overlapped desorption processes from active sights of similar strength. Introduction of potassium tungstophosphate affects active sites present in BEA zeolite for glyphosate desorption and significantly increases the amount of adsorbed pesticide in comparison to BEA zeolite. Supporting of potassium tungstophosphate on BEA zeolite via in situ synthesis procedure enables the formation of highly efficient adsorbents and revealed their perspective environmental application. [Display omitted]
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2019.01.018