Spectroscopic study of Se(IV) removal from water by reductive precipitation using sulfide

Bahngmi Jung, Aya Safan, Bill Batchelor, Ahmed Abdel-Wahab

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This study investigates the removal of selenium (IV) from water by reductive precipitation using sodium sulfide at neutral pH. Also, it examines the application of UV light as an activating method to enhance reductive precipitation. Furthermore, this work evaluates the effects of sulfide dose and solution pH on behavior of Se(IV) reduction. Selenium was effectively removed in sulfide solution at both neutral and acidic pH. UV irradiation did not enhance removal efficiency of Se(IV) at conditions tested, but it affected solids morphology and composition. SEM/EDS and XPS results showed that selenite was reduced to elemental Se or Se-S precipitates (e.g. SenS8-n) in sulfide solution. High resolution S 2p XPS spectra suggested the presence of sulfur-containing anions (e.g. S2O3 2−, HSO3 , etc.) or elemental S (S0), monosulfide (S2−), and polysulfides (Sn 2−), which could be produced from sulfide photolysis or reaction with Se. In addition, large aggregates of irregular shape, which suggest Se-S precipitates or elemental sulfur, were found more prominently at pH 4 than at pH 7, and they were more noticeable in the presence of UV with longer reaction times. In addition, XRD patterns showed that gray elemental Se solids were dominant in experiments without UV, whereas Se-S precipitates (Se3S5) with an orange color were found in those with UV.

Original languageEnglish
Pages (from-to)351-358
Number of pages8
JournalChemosphere
Volume163
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Fingerprint

Sulfides
sulfide
Precipitates
Water
Selenium
Sulfur
selenium
X ray photoelectron spectroscopy
X-ray spectroscopy
Selenious Acid
water
sulfur
Photolysis
selenite
Ultraviolet radiation
Anions
Energy dispersive spectroscopy
photolysis
Irradiation
anion

Keywords

  • Reductive precipitation
  • Selenite
  • Selenium removal
  • Sodium sulfide
  • Ultraviolet light

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Spectroscopic study of Se(IV) removal from water by reductive precipitation using sulfide. / Jung, Bahngmi; Safan, Aya; Batchelor, Bill; Abdel-Wahab, Ahmed.

In: Chemosphere, Vol. 163, 01.11.2016, p. 351-358.

Research output: Contribution to journalArticle

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