Article ID Journal Published Year Pages File Type
221802 Journal of Environmental Chemical Engineering 2014 10 Pages PDF
Abstract

•A novel composite based on chitosan supported nano-alumina/nano-titania mixture.•Adsorption coupled photo catalytic reduction of Cr(VI) under fluorescent light.•A very high cumulative removal capacity of 2467.6 mg g−1 with nine cycles of reuse.•Rapid removal with 97.3% efficiency observed within 10 min of reaction.

The current study deals with Cr(VI) removal using a polymer-nano metal oxide based composite film under fluorescent light condition. This was prepared by the layer-by-layer coating of chitosan/polyethylene glycol (PEG) blend, polystyrene sulphate (PSS) and nanotitania/nanoalumina mixture respectively on the glass slide. The Taguchi’s orthogonal array (L25) design was employed for determining the optimal process factors (pH: 6, reaction time: 10 min and initial Cr(VI) concentration: 20 mg L−1) and the film preparation factors (dosage of PEG: 0.5 v/v%, dosage of PSS: 0.25 v/v%, dosage of nanotitania–nanoalumina mixture: 95:5 mg L−1). The maximum removal capacity observed at the optimal conditions was 278.9 ± 4.3 mg g−1. The SEM–EDX, XPS, FTIR–ATR spectra confirmed the photocatalytic reduction of Cr(VI) and binding of Cr(III) species on the PSS layer. A 97% regeneration of the film and a cumulative removal capacity of 2467.6 mg g−1 were observed after nine cycles of reuse. This removal capacity for chromium is about twenty fold higher than that reported by any single nanoparticle so far.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
Authors
, , , ,