Adsorption of sodium dodecyl sulfate (SDS) at ZnSe and α-Fe2O3 surfaces: Combining infrared spectroscopy and batch uptake studies

Xiaodong Gao, Jon Chorover

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Adsorption of sodium dodecyl sulfate (SDS) at the solid/aqueous interface was examined as a function of pH and SDS concentration ([SDS]) using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy and batch uptake experiments. Two types of sorbent surfaces were compared: (i) a hydrophobic zinc selenide (ZnSe) ATR internal reflection element (IRE) and (ii) the same surface coated with hydrophilic nanoparticulate α-Fe2O3 (hematite). The results indicate that adsorption to the ZnSe IRE is affected by both electrostatic attraction and hydrophobic interaction. Batch adsorption and ATR-FTIR spectral results are consistent with SDS forming outer-sphere complexes at the α-Fe2O3 surface. There is also no evidence for ligand (SDS)-promoted dissolution of hematite. Adsorption to hematite is dominated by anion exchange and surfactant self-assembly. ATR-FTIR data indicate that adsorption to both surfaces shows a strong pH dependence at low [SDS] and negligible pH dependence when [SDS] exceeds the critical micelle concentration (cmc). Adsorption to ZnSe IRE shows small variation with [SDS], apparently due to a lack of surfactant self-assembly at the interface. Adsorption to α-Fe2O3 is a rapid process; equilibrium is reached within a few minutes. Conversely, adsorption to the ZnSe IRE shows strong longer time dependence; evidently, hydrophobic interfacial reactions constitute a much slower process.

Original languageEnglish (US)
Pages (from-to)167-176
Number of pages10
JournalJournal of Colloid and Interface Science
Volume348
Issue number1
DOIs
StatePublished - Aug 2010

Fingerprint

Sodium dodecyl sulfate
Sodium Dodecyl Sulfate
Infrared spectroscopy
Zinc
Adsorption
Hematite
Surface-Active Agents
Self assembly
Fourier transforms
Surface active agents
Infrared radiation
zinc selenide
Critical micelle concentration
Sorbents
Surface chemistry
Fourier transform infrared spectroscopy
Anions
Electrostatics
Ion exchange
Dissolution

Keywords

  • Adsorption
  • ATR-FTIR spectroscopy
  • Hematite
  • SDS
  • ZnSe IRE

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

@article{9616184772804482b98627eaa10ec013,
title = "Adsorption of sodium dodecyl sulfate (SDS) at ZnSe and α-Fe2O3 surfaces: Combining infrared spectroscopy and batch uptake studies",
abstract = "Adsorption of sodium dodecyl sulfate (SDS) at the solid/aqueous interface was examined as a function of pH and SDS concentration ([SDS]) using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy and batch uptake experiments. Two types of sorbent surfaces were compared: (i) a hydrophobic zinc selenide (ZnSe) ATR internal reflection element (IRE) and (ii) the same surface coated with hydrophilic nanoparticulate α-Fe2O3 (hematite). The results indicate that adsorption to the ZnSe IRE is affected by both electrostatic attraction and hydrophobic interaction. Batch adsorption and ATR-FTIR spectral results are consistent with SDS forming outer-sphere complexes at the α-Fe2O3 surface. There is also no evidence for ligand (SDS)-promoted dissolution of hematite. Adsorption to hematite is dominated by anion exchange and surfactant self-assembly. ATR-FTIR data indicate that adsorption to both surfaces shows a strong pH dependence at low [SDS] and negligible pH dependence when [SDS] exceeds the critical micelle concentration (cmc). Adsorption to ZnSe IRE shows small variation with [SDS], apparently due to a lack of surfactant self-assembly at the interface. Adsorption to α-Fe2O3 is a rapid process; equilibrium is reached within a few minutes. Conversely, adsorption to the ZnSe IRE shows strong longer time dependence; evidently, hydrophobic interfacial reactions constitute a much slower process.",
keywords = "Adsorption, ATR-FTIR spectroscopy, Hematite, SDS, ZnSe IRE",
author = "Xiaodong Gao and Jon Chorover",
year = "2010",
month = "8",
doi = "10.1016/j.jcis.2010.04.011",
language = "English (US)",
volume = "348",
pages = "167--176",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Adsorption of sodium dodecyl sulfate (SDS) at ZnSe and α-Fe2O3 surfaces

T2 - Combining infrared spectroscopy and batch uptake studies

AU - Gao, Xiaodong

AU - Chorover, Jon

PY - 2010/8

Y1 - 2010/8

N2 - Adsorption of sodium dodecyl sulfate (SDS) at the solid/aqueous interface was examined as a function of pH and SDS concentration ([SDS]) using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy and batch uptake experiments. Two types of sorbent surfaces were compared: (i) a hydrophobic zinc selenide (ZnSe) ATR internal reflection element (IRE) and (ii) the same surface coated with hydrophilic nanoparticulate α-Fe2O3 (hematite). The results indicate that adsorption to the ZnSe IRE is affected by both electrostatic attraction and hydrophobic interaction. Batch adsorption and ATR-FTIR spectral results are consistent with SDS forming outer-sphere complexes at the α-Fe2O3 surface. There is also no evidence for ligand (SDS)-promoted dissolution of hematite. Adsorption to hematite is dominated by anion exchange and surfactant self-assembly. ATR-FTIR data indicate that adsorption to both surfaces shows a strong pH dependence at low [SDS] and negligible pH dependence when [SDS] exceeds the critical micelle concentration (cmc). Adsorption to ZnSe IRE shows small variation with [SDS], apparently due to a lack of surfactant self-assembly at the interface. Adsorption to α-Fe2O3 is a rapid process; equilibrium is reached within a few minutes. Conversely, adsorption to the ZnSe IRE shows strong longer time dependence; evidently, hydrophobic interfacial reactions constitute a much slower process.

AB - Adsorption of sodium dodecyl sulfate (SDS) at the solid/aqueous interface was examined as a function of pH and SDS concentration ([SDS]) using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy and batch uptake experiments. Two types of sorbent surfaces were compared: (i) a hydrophobic zinc selenide (ZnSe) ATR internal reflection element (IRE) and (ii) the same surface coated with hydrophilic nanoparticulate α-Fe2O3 (hematite). The results indicate that adsorption to the ZnSe IRE is affected by both electrostatic attraction and hydrophobic interaction. Batch adsorption and ATR-FTIR spectral results are consistent with SDS forming outer-sphere complexes at the α-Fe2O3 surface. There is also no evidence for ligand (SDS)-promoted dissolution of hematite. Adsorption to hematite is dominated by anion exchange and surfactant self-assembly. ATR-FTIR data indicate that adsorption to both surfaces shows a strong pH dependence at low [SDS] and negligible pH dependence when [SDS] exceeds the critical micelle concentration (cmc). Adsorption to ZnSe IRE shows small variation with [SDS], apparently due to a lack of surfactant self-assembly at the interface. Adsorption to α-Fe2O3 is a rapid process; equilibrium is reached within a few minutes. Conversely, adsorption to the ZnSe IRE shows strong longer time dependence; evidently, hydrophobic interfacial reactions constitute a much slower process.

KW - Adsorption

KW - ATR-FTIR spectroscopy

KW - Hematite

KW - SDS

KW - ZnSe IRE

UR - http://www.scopus.com/inward/record.url?scp=77953617675&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77953617675&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2010.04.011

DO - 10.1016/j.jcis.2010.04.011

M3 - Article

C2 - 20472243

AN - SCOPUS:77953617675

VL - 348

SP - 167

EP - 176

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 1

ER -