Dechlorination and oxidative degradation of 4-chlorophenol with nanostructured iron-silver alginate beads

• Published in: Journal of environmental chemical engineering Vol. 5; no. 1; pp. 838 - 842
• Main Authors: Barreto-Rodrigues, Marcio, Silveira, Jefferson, García-Muñoz, Patricia, Rodriguez, Juan J.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-02-2017
• Subjects: Alginate beads; Chlorophenol; Dechlorination; Nanostructured catalyst; Nanostructured catalyst; Alginate beads; Dechlorination; Chlorophenol
• ISSN: 2213-3437; 2213-3437
• DOI: 10.1016/j.jece.2016.12.051

•Preparation and characterization of NZVI-Ag and NZVI-Ag-Alginate beads.•Dechlorination and oxidation of 4-CP with NZVI-Ag-Alginate beads.•The dechlorination was more effective at lower pH, which also favors the formation of Fe2+ from Fe0.•Integration of NZVI-Ag-Alg with H2O2 allows significant oxidation of Chlorophenol at pH 3.0.
In this work, bimetallic zerovalent iron-silver nanoparticles (NZVI-Ag) immobilized in calcium alginate beads were prepared and characterized. This material was tested as catalyst in the dechlorination and oxidation of 4-chlorophenol (CP-4). The bimetallic nanoparticles showed average size and BET surface area around 80nm and 22m2g−1, respectively, with morphology and crystallinity typical of nanometric metallic iron. 4-CP dechlorination was more efficient at pH 3 than at pH 5 and at the former was completed in 30min. Further addition of H2O2 allowed high TOC reduction, quite similar to the obtained with the bare metallic nanoparticles but with lower metal leaching.