Arsenic Immobilization by Nanoscale Zero-Valent Iron / Immobilizacja Arsenu Przez Nanożelazo Na Zerowym Stopniu Utlenienia

• Authors: Alena Rodová , Jan Filip , Miroslav Černík
• Languages of publication: EN

Abstracts

EN

Contaminated mine water from the Kank site (Czech Republic) containing arsenic at a concentration of approximately 85 mg/dm3 was tested in a reaction with elemental iron nanoparticles. In a reductive environment there was a reduction of As to the more soluble and toxic form of As(III) depending on the pH of the solution. Oxidation of elemental iron creates oxyhydroxides which incorporate As into their structure in the form of mixed complexes and thereby remove and bind dissolved As from the solution. The addition of 0.5 g/dm3 nZVI to the contaminated water leads to a significant decrease in ORP and concentrations of As to around the detection limit. The pH of the solution is not significantly affected by the addition of nZVI. The main competing anion for co-precipitation is represented by phosphates whose concentration after the addition of nZVI was reduced to 6.5% of the original value. The resulting precipitates were analyzed by XPS, XRF, XRD, SEM-EDX and Mössbauer spectroscopy. The presence of jarosite, Schwertmannite and also arsenic probably in the form of skorodite was confirmed

PL

W Kaňk (Czeska Republika) znajduje się zanieczyszczona woda z kopalni, zawierająca arsen o przybliżonym stężeniu 85 mg/dm3. Została ona poddana reakcji z nanocząteczkami żelaza na zerowym stopniu utlenienia (nZVI). W zależności od pH roztworu w środowisku redukcyjnym przebiegła reakcja redukcji As do bardziej rozpuszczalnej i toksycznej formy As(III). Poprzez utlenienie elementarnego żelaza powstają tlenowodorotlenki, łączące się z As w postać kompleksów mieszanych, tym samym usuwając As z zanieczyszczonego roztworu. Dodatek 0,5 g/dm3 nZVI do zanieczyszczonej wody prowadzi do znaczącego spadku wartości ORP i obniżenia stężenia As do granic wykrywalności. Dodatek nZVI nie ma znaczącego wpływu na wartość pH roztworu. Głównym anionem konkurującym we współstrąceniu As jest anion fosforanowy, którego stężenie po dodaniu nZVI zmniejszyło się do 6,5% w porównaniu do wartości wyjściowej. Powstały osad został poddany analizie metodami: XPS XRF, XRD, SEM-EDX i spektroskopią Mössbauerowską. Została potwierdzona obecność jarosytu, schwertmannitu oraz arsenu prawdopodobnie w postaci skorodytu

Keywords

EN

contaminated water; zero-valent iron; nZVI; arsenic

PL

zanieczyszczona woda; nanożelazo na zerowym stopniu utlenienia; nZVI; arsen

• Publisher: De Gruyter Open
• Journal: Ecological Chemistry and Engineering S
• Year: 2015
• Volume: 22
• Issue: 1
• Pages: 45-59

Dates

published

1 - 3 - 2015

online

18 - 4 - 2015

Contributors

author

Alena Rodová

• Technical University of Liberec, Studentska 2, CZ46117 Liberec, Czech Republic

author

Jan Filip

• Palacky University Olomouc, Krizkovskeho 8, CZ77147 Olomouc, Czech Republic

author

Miroslav Černík

• Technical University of Liberec, Studentska 2, CZ46117 Liberec, Czech Republic

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Identifiers

DOI

10.1515/eces-2015-0002