ARSENIC IMMOBILIZATION BY NANOSCALE ZERO-VALENT IRON

作者：Rodova Alena; Filip Jan; Cernik Miroslav^*

来源：Ecological Chemistry and Engineering S-Chemia i Inzynieria Ekologiczna S, 2015, 22(1): 45-59.

DOI：10.1515/eces-2015-0002

• contaminated water
• zero-valent iron
• nZVI
• arsenic

Contaminated mine water from the Kank site (Czech Republic) containing arsenic at a concentration of approximately 85 mg/dm(3) 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/dm(3) 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 Mossbauer spectroscopy. The presence of jarosite, Schwertmannite and also arsenic probably in the form of skorodite was confirmed.

• 出版日期2015