Determination of surface properties of iron hydroxide-coated alumina adsorbent prepared for removal of arsenic from drinking water

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Abstract

A novel type adsorbent was prepared by in situ precipitation of Fe(OH) 3 on the surface of activated Al2O3 as a support material. The iron content of the adsorbent was 0.31±0.003% m/m (56.1 mmol/g); its mechanical and chemical stability proved to be appropriate in solutions. The total capacity of the adsorbent was 0.12 mmol/g, and the pH of zero point of charge, pHzpc =6.9±0.3. Depending on the pH of solutions, the adsorbent can be used for binding of both anions and cations, if pHeq <pHzpc anions are sorbed on the surface of adsorbent (S) through {S-OH2+} and {S-OH} groups. A graphical method was used for the determination of pHiep (isoelectric points) of the adsorbent and values of pHiep =6.1±0.3 for As(III) and pHiep =8.0±0.3 for As(V) ions were found. The amount of surface charged groups (Q) was about zero within the a pH range of 6.5-8.6, due to the practically neutral surface formed on the adsorption of As(V) ions. At acidic pH (pH 4.7), Q=0.19 mol/kg was obtained. The adsorption of arsenate and arsenite ions from solutions of 0.1-0.4 mmol/L was represented by Langmuir-type isotherms. A great advantage of the adsorbent is that it can be used in adsorption columns, and low waste technology for removal of arsenic from drinking water can be developed.

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalJournal of Colloid and Interface Science
Volume284
Issue number1
DOIs
Publication statusPublished - Apr 1 2005

Fingerprint

drinking
Aluminum Oxide
Arsenic
adsorbents
arsenic
Potable water
Drinking Water
Adsorbents
surface properties
hydroxides
Surface properties
Alumina
Iron
aluminum oxides
iron
water
Ions
Adsorption
adsorption
Anions

Keywords

  • Adsorption
  • Alumina
  • Arsenate
  • Arsenite
  • Iron hydroxide
  • Isoelectric points
  • Isotherms
  • Zero point of charge

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

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title = "Determination of surface properties of iron hydroxide-coated alumina adsorbent prepared for removal of arsenic from drinking water",
abstract = "A novel type adsorbent was prepared by in situ precipitation of Fe(OH) 3 on the surface of activated Al2O3 as a support material. The iron content of the adsorbent was 0.31±0.003{\%} m/m (56.1 mmol/g); its mechanical and chemical stability proved to be appropriate in solutions. The total capacity of the adsorbent was 0.12 mmol/g, and the pH of zero point of charge, pHzpc =6.9±0.3. Depending on the pH of solutions, the adsorbent can be used for binding of both anions and cations, if pHeq zpc anions are sorbed on the surface of adsorbent (S) through {S-OH2+} and {S-OH} groups. A graphical method was used for the determination of pHiep (isoelectric points) of the adsorbent and values of pHiep =6.1±0.3 for As(III) and pHiep =8.0±0.3 for As(V) ions were found. The amount of surface charged groups (Q) was about zero within the a pH range of 6.5-8.6, due to the practically neutral surface formed on the adsorption of As(V) ions. At acidic pH (pH 4.7), Q=0.19 mol/kg was obtained. The adsorption of arsenate and arsenite ions from solutions of 0.1-0.4 mmol/L was represented by Langmuir-type isotherms. A great advantage of the adsorbent is that it can be used in adsorption columns, and low waste technology for removal of arsenic from drinking water can be developed.",
keywords = "Adsorption, Alumina, Arsenate, Arsenite, Iron hydroxide, Isoelectric points, Isotherms, Zero point of charge",
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T1 - Determination of surface properties of iron hydroxide-coated alumina adsorbent prepared for removal of arsenic from drinking water

AU - Hlavay, J.

AU - Polyák, K.

PY - 2005/4/1

Y1 - 2005/4/1

N2 - A novel type adsorbent was prepared by in situ precipitation of Fe(OH) 3 on the surface of activated Al2O3 as a support material. The iron content of the adsorbent was 0.31±0.003% m/m (56.1 mmol/g); its mechanical and chemical stability proved to be appropriate in solutions. The total capacity of the adsorbent was 0.12 mmol/g, and the pH of zero point of charge, pHzpc =6.9±0.3. Depending on the pH of solutions, the adsorbent can be used for binding of both anions and cations, if pHeq zpc anions are sorbed on the surface of adsorbent (S) through {S-OH2+} and {S-OH} groups. A graphical method was used for the determination of pHiep (isoelectric points) of the adsorbent and values of pHiep =6.1±0.3 for As(III) and pHiep =8.0±0.3 for As(V) ions were found. The amount of surface charged groups (Q) was about zero within the a pH range of 6.5-8.6, due to the practically neutral surface formed on the adsorption of As(V) ions. At acidic pH (pH 4.7), Q=0.19 mol/kg was obtained. The adsorption of arsenate and arsenite ions from solutions of 0.1-0.4 mmol/L was represented by Langmuir-type isotherms. A great advantage of the adsorbent is that it can be used in adsorption columns, and low waste technology for removal of arsenic from drinking water can be developed.

AB - A novel type adsorbent was prepared by in situ precipitation of Fe(OH) 3 on the surface of activated Al2O3 as a support material. The iron content of the adsorbent was 0.31±0.003% m/m (56.1 mmol/g); its mechanical and chemical stability proved to be appropriate in solutions. The total capacity of the adsorbent was 0.12 mmol/g, and the pH of zero point of charge, pHzpc =6.9±0.3. Depending on the pH of solutions, the adsorbent can be used for binding of both anions and cations, if pHeq zpc anions are sorbed on the surface of adsorbent (S) through {S-OH2+} and {S-OH} groups. A graphical method was used for the determination of pHiep (isoelectric points) of the adsorbent and values of pHiep =6.1±0.3 for As(III) and pHiep =8.0±0.3 for As(V) ions were found. The amount of surface charged groups (Q) was about zero within the a pH range of 6.5-8.6, due to the practically neutral surface formed on the adsorption of As(V) ions. At acidic pH (pH 4.7), Q=0.19 mol/kg was obtained. The adsorption of arsenate and arsenite ions from solutions of 0.1-0.4 mmol/L was represented by Langmuir-type isotherms. A great advantage of the adsorbent is that it can be used in adsorption columns, and low waste technology for removal of arsenic from drinking water can be developed.

KW - Adsorption

KW - Alumina

KW - Arsenate

KW - Arsenite

KW - Iron hydroxide

KW - Isoelectric points

KW - Isotherms

KW - Zero point of charge

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JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

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