Removal of Se(IV) from aqueous solution using sulphuric acid-treated peanut shell

Research output: Contribution to journalArticle

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Abstract

A carbonaceous sorbent was prepared from peanut shell via sulphuric acid treatment. Se(IV) removal from aqueous solution on the sorbent was studied varying time, pH, Se(IV) concentration, temperature and sorbent status (wet and dry). Se(IV) removal was faster using the wet sorbent than the dry sorbent following a pseudo-first-order model. Se(IV) removal increases at low pH values, and decreases as pH increases until pH 7. Sorption was found to fit the Langmuir equation and sorption capacity for the wet sorbent was higher than that for the dry one. Both sorbents showed an increased selenium sorption by rising the temperature. Redox processes between Se(IV) and the carbon sorbent are involved. Analysis by scanning electron microscope and X-ray powder diffraction for the sorbent after the reaction with acidified Se(IV) confirmed the availability of elemental selenium as particles on the sorbent surface as a result of Se(IV) reduction. Physicochemical tests showed an increase in sorbent acidity, cation exchange capacity (CEC) and surface functionality after the reaction with acidified Se(IV), indicating the oxidation processes occurring on the sorbent surface. Due to its reduction properties, the sorbent seems efficient for Se(IV) removal from aqueous solution.

Original languageEnglish
Pages (from-to)620-627
Number of pages8
JournalJournal of Environmental Management
Volume84
Issue number4
DOIs
Publication statusPublished - Sep 2007

Fingerprint

Sorbents
sulfuric acid
aqueous solution
shell
Acids
sorption
selenium
cation exchange capacity
acidity
Sorption
temperature
X-ray diffraction
Selenium
oxidation
electron
removal
carbon
Acidity
X ray powder diffraction
Ion exchange

Keywords

  • Carbon
  • Peanut shell
  • Reduction
  • Selenium
  • Sorption
  • Sulphuric

ASJC Scopus subject areas

  • Environmental Science(all)
  • Management, Monitoring, Policy and Law

Cite this

Removal of Se(IV) from aqueous solution using sulphuric acid-treated peanut shell. / El-Shafey, E. I.

In: Journal of Environmental Management, Vol. 84, No. 4, 09.2007, p. 620-627.

Research output: Contribution to journalArticle

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