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  4. Preparation of novel adsorbents based on combinations of polysiloxanes and sewage sludge to remove pharmaceuticals from aqueous solutions
 
Zitierlink DOI
10.26092/elib/2603
Verlagslink DOI
10.1016/j.colsurfa.2016.03.021

Preparation of novel adsorbents based on combinations of polysiloxanes and sewage sludge to remove pharmaceuticals from aqueous solutions

Veröffentlichungsdatum
2016-03-19
Autoren
Simoes dos Reis, Glaydson  
Hoffmann Sampaio, Carlos  
Lima, Eder Claudio  
Wilhelm, Michaela  
Zusammenfassung
Novel adsorbents were developed by varying the ratios of polysiloxanes and sewage sludge. The adsorbents were synthesized by mixing various polysiloxanes with methyl (MK), methyl/phenyl (H44) or without functional groups with sewage sludge in a solvent and pyrolyzed under an inert atmosphere. The adsorbents were characterized using several analytical and functional techniques, and used for adsorption of diclofenac (DCF) and nimesulide (NM) from aqueous solutions. Nitrogen adsorption/desorption measurements showed type I isotherms, which are typically for microporous materials, and the specific surface areas (SBET) were found to be in the range of 48 m2 g−1 and
631 m2 g−1. The sludge content was the major determinant for a decrease in SBET and hydrophobicity, as compared with pure polysiloxane samples. Among the composite materials, H67S33-500 (sample with 67% of polysiloxane H44 and 33% of sludge pyrolyzed at 500◦C) had the highest SBET value of 487 m2 g−1 while M40T60-600 (sample with 40% of polysiloxane MK and 60% of TEOS and pyrolyzed at 600◦C) exhibited the highest SBET value of 631 m2 g−1 among the hybrid materials. Experimental variables such as initial pH of the adsorbate solutions was optimized for adsorptive characteristics of the novel adsorbents. The optimum pH for adsorption of DCF and NM onto the adsorbents were 7.0 and 9.0, respectively. The equilibrium of adsorption was investigated using Langmuir, Freundlich and Sips models. Sips isotherm model gave the best fit of the equilibrium data. DCF showed better affinity for
adsorbents than NM—suggesting that hydrophobic sites on the surfaces played a key role in the adsorption
process.
Schlagwörter
Sewage sludge

; 

Polysiloxanes

; 

Novel adsorbents

; 

Hydrophobic surface

; 

Adsorption of pharmaceuticals
Verlag
Elsevier {BV}
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Fachgebiet 17: Keramische Werkstoffe und Bauteile  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Colloids and Surfaces A: Physicochemical and Engineering Aspects  
Band
497
Startseite
304
Endseite
315
Seitenzahl
12
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
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Vorschaubild
Name

SIMOES DOS REIS - Preparation of novel adsorbents.pdf

Size

3.34 MB

Format

Adobe PDF

Checksum

(MD5):25ca04f74b52beb38e2567ff975e98f4

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