Skip navigation
SuUB logo
DSpace logo

  • Home
  • Institutions
    • University of Bremen
    • City University of Applied Sciences
    • Bremerhaven University of Applied Sciences
  • Sign on to:
    • My Media
    • Receive email
      updates
    • Edit Account details

Citation link: https://doi.org/10.26092/elib/2603

Publisher DOI: https://doi.org/10.1016/j.colsurfa.2016.03.021
SIMOES DOS REIS - Preparation of novel adsorbents.pdf
OpenAccess
 
by-nc-nd 4.0

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


File Description SizeFormat
SIMOES DOS REIS - Preparation of novel adsorbents.pdf3.42 MBAdobe PDFView/Open
Authors: Simoes dos Reis, Glaydson  
Hoffmann Sampaio, Carlos  
Lima, Eder Claudio  
Wilhelm, Michaela  
Abstract: 
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.
Keywords: Sewage sludge; Polysiloxanes; Novel adsorbents; Hydrophobic surface; Adsorption of pharmaceuticals
Issue Date: 19-Mar-2016
Publisher: Elsevier {BV}
Funders: National Council for Scientific and Tech- nological Development (CNPq, Brazil) and DAAD
Journal/Edited collection: Colloids and Surfaces A: Physicochemical and Engineering Aspects 
Start page: 304
End page: 315
Volume: 497
Pages: 12
Type: Artikel/Aufsatz
ISSN: 09277757
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2603
URN: urn:nbn:de:gbv:46-elib73474
Institution: Universität Bremen 
Faculty: Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04) 
Institute: Fachgebiet 17: Keramische Werkstoffe und Bauteile 
Appears in Collections:Forschungsdokumente

  

Page view(s)

90
checked on May 10, 2025

Download(s)

68
checked on May 10, 2025

Google ScholarTM

Check


This item is licensed under a Creative Commons License Creative Commons

Legal notice -Feedback -Data privacy
Media - Extension maintained and optimized by Logo 4SCIENCE