title: As(III) oxidation by MnO2 coated PEEK-WC nanostructured capsules.
abstract: PEEK-WC nanostructured capsules were prepared by the phase inversion technique and used as support for the coating of a manganese dioxide layer. The coating was done by a chemical treatment of the capsules followed by a thermal one. The presence of the MnO(2) layer was confirmed by scanning electron microscopy (SEM), back scattering electron (BSE), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. The produced capsules were, then, tested for As(III) oxidation in batch. The experiments consisted in treating 165 ml of As(III) solution with 1g of coated capsules at fixed temperature (15°C) and pH (5.7-5.8). In particular, the efficiency of the system was investigated for different As(III) concentrations (0.1, 0.3, 0.7 and 1 ppm). For feeds at lower As(III) content (0.1-0.3 ppm), tests lasted for 8h, while prolonged runs (up to 48 h) were carried out on more concentrated solutions (0.7 and 1 ppm). The produced capsules were able to oxidize As(III) into As(V) leading to complete conversion after 3 and 4h for feed concentrations of 0.1 and 0.3 ppm, respectively.
authors.affiliation: Institute on Membrane Technology, ITM-CNR, Via P. Bucci Cubo 17/C, 87030 Rende (CS), Italy. a.criscuoli@itm.cnr.it
authors.forename: Alessandra
authors.initials: A
authors.lastname: Criscuoli
authors.forename: Swachchha
authors.initials: S
authors.lastname: Majumdar
authors.forename: Alberto
authors.initials: A
authors.lastname: Figoli
authors.forename: Ganesh C
authors.initials: GC
authors.lastname: Sahoo
authors.forename: Patrizia
authors.initials: P
authors.lastname: Bafaro
authors.forename: Sibdas
authors.initials: S
authors.lastname: Bandyopadhyay
authors.forename: Enrico
authors.initials: E
authors.lastname: Drioli
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D002214:Capsules; D017895:Manganese Compounds / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D002214:Capsules; D017895:Manganese Compounds; D010087:Oxides; D011108:Polymers; D014874:Water Pollutants, Chemical; D001151:Arsenic; C016552:manganese dioxide