Scholarly record
APPLICATION OF TECHNICAL STONE WASTE IN PHOSPHATE, ARSENATE AND CHROMATE REMOVAL FROM CONTAMINATED WATER
Abstract
Powdered waste sludge from the production of technical stone (TSW), produced by theTechniStone® Company (Hradec Kralove, Czech Republic), was surface modified withFe2+ and Mn2+ inorganic salts and then testified as a potential adsorbent ofenvironmentally important oxyanions (phosphate PO43-, arsenate AsO43- and chromateCrO42-) from contaminated waters. The surface modification in principle consisted increating a thin layer of hydrated Fe/Mn ions in reactive form on the TSW surface.Thanks to the change of the surface charge (pHZPC), the newly formed Fe/Mn activesurface sites were then appropriate for a selective anion adsorption. The batchadsorption experiments were performed with 0.3 mmol.L-1 model solutions of PO43-,AsO43- and CrO42- and the sorbent (TSW, TSWFe and TSWMn) fraction of ?0.1 mm, atthe laboratory temperature (20 °C). The obtained data were fitted by the Langmuirmodel. The adsorption of oxyanions on the original TSW was completely ineffective,with the yield of ?2% for AsO43- and a maximum of 8% for CrO42-. Even the negativegradient of PO43- adsorption on TSW was related to the simultaneous leaching of PO43-primarily contained in the original material. The Fe or Mn surface modificationincreased the adsorption efficiency to >99% for the PO43- adsorption, to 99% for theAsO43- adsorption, and to 82–86% for CrO42- adsorption. While the use of TSWFeindicated the highest adsorption capacity and yield for all tested oxyanions, theLangmuir parameters revealed the adsorption on TSWMn as more robust, with orders ofmagnitude higher adsorption constants (KL) and a lower Gibbs energy consumption(?G). The selectivity of the oxyanion adsorption to TSWFe and TSWMn decreased in theorder: PO43- > AsO43- > CrO42-.
Publication Impact Profile
- Captures
- Mendeley - Readers: 1
Publication details
ReferencesPending
Structured references will appear here after the reference import pass. The count is preserved now so the scholarly record is not incomplete.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.