Adsorption kinetics and aggregation for three classes of carbonaceous adsorbents in the presence of natural organic matter

Ersan G., KAYA Y., Ersan M. S., Apul O. G., Karanfil T.

CHEMOSPHERE, cilt.229, ss.515-524, 2019 (SCI-Expanded, Scopus) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 229
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.chemosphere.2019.05.014
  • Dergi Adı: CHEMOSPHERE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.515-524
  • Anahtar Kelimeler: Carbonaceous materials, Organic compounds, Adsorption kinetics, Aggregation, Natural organic matter, GRANULAR ACTIVATED CARBONS, GRAPHENE OXIDE, AROMATIC-COMPOUNDS, AQUEOUS-SOLUTIONS, 17-ALPHA-ETHINYL ESTRADIOL, ESTROGEN CONTAMINANTS, COLLOIDAL PROPERTIES, DYE ADSORPTION, BISPHENOL-A, NANOTUBES
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet

Özet

In this study, adsorption kinetics of phenanthrene (PNT) and trichloroethylene (TCE) by a graphene nanosheet (GNS), a graphene oxide nanosheet (GO), a single-walled carbon nanotube (SWCNT), a multi-walled carbon nanotube (MWCNT), and two coal based activated carbons (ACs) (F400 and HD3000) were examined in distilled and deionized water (DDW) and under natural organic matter (NOM) preloading conditions. The results showed the times needed for the adsorption of PNT and TCE to reach apparent equilibrium (i.e., <= 3% change per day) followed the order of GO >= MWCNT > GNS > SWCNT - HD3000-F400 and SWCNT > GNS - HD3000 > F400 - MWCNT > GO, respectively. The pseudo second order model successfully represented kinetics data for three classes of carbonaceous adsorbents. The Weber-Morris intraparticle diffusion model indicated three steps adsorption process for PNT and two step adsorption for TCE. In addition, the times needed to reach apparent equilibrium for the adsorption of PNT and TCE in the presence of hydrophobic (HPO) and hydrophilic (HPI) NOM solutions increased for all adsorbents (except for GO). In general, both NOM showed similar impacts on the adsorption rates of PNT and TCE. Aggregation of both GNS and CNTs rapidly occurred during initial couple hours of contact time during preloading, and spiking both PNT and ICE further increased their aggregation. (C) 2019 Elsevier Ltd. All rights reserved.