title: Ecotoxicological impact of sunlight assisted photoreduction of hexavalent chromium present in wastewater with zinc oxide nanoparticles on common Anabaena flos-aquae.
abstract: Hexavalent chromium is more toxic and carcinogenic compared to its trivalent counterpart. Hexavalent chromium can be photocatalytically reduced to trivalent one using zinc oxide semiconductor and solar or UV radiation as light source. But an important ecological aspect is whether the net toxicity decreases after the photocatalytic process. In the present work, we have selected Anabaena flos-aquae as the model organism and examined whether the net toxicity to which it has been exposed in water decreases after photocatalytic reduction of hexavalent chromium using ZnO semiconductor as photocatalyst. We have studied the cumulative toxicities of both chromium (before and after treatment) and ZnO (both nano and micro) separately and as a suspension of ZnO in chromium. Quantitative cell surface roughness analysis was conducted using AFM to confirm the changes in cell surface properties.
authors.affiliation: Department of Chemical Technology, University of Calcutta, 92, Acharya P.C. Road, Kolkata 700009, India.
authors.forename: Isita
authors.initials: I
authors.lastname: Nandi
authors.forename: Pallavi
authors.initials: P
authors.lastname: Mitra
authors.forename: Prantik
authors.initials: P
authors.lastname: Banerjee
authors.forename: Anirban
authors.initials: A
authors.lastname: Chakrabarti
authors.forename: Mahua
authors.initials: M
authors.lastname: Ghosh
authors.forename: Sampa
authors.initials: S
authors.lastname: Chakrabarti
mesh_terms: D002857:Chromium / Q000737:chemistry / Q000528:radiation effects*; D046869:Dolichospermum flos-aquae / Q000187:drug effects*; D054750:Ecotoxicology; D053758:Nanoparticles / Q000737:chemistry*; D013472:Sunlight; D014466:Ultraviolet Rays; D062065:Wastewater / Q000737:chemistry / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity*; D015034:Zinc Oxide / Q000737:chemistry / Q000633:toxicity*
chemical_list: D002857:Chromium; D062065:Wastewater; D014874:Water Pollutants, Chemical; D015034:Zinc Oxide; C074702:chromium hexavalent ion