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• W2994877144 endingPage "125560" @default.
• W2994877144 startingPage "125560" @default.
• W2994877144 abstract "Bauxite residue is the by-product of the aluminium industry with an annual output of more than 200 million metric tons in China. Its treatment is still a big problem because more than 96% of that is stockpiled on land causing environmental pollution and threatening the human health. This study used bauxite residue to remove Cr (Ⅲ) from aqueous solution and analyzed the removal mechanism. The removal time was dependent on the initial concentrations of Cr (Ⅲ) and different active components acted on different reaction period. Reaction time increased from <5 min to >2 h with an increase of Cr (Ⅲ) concentration from 5 to 100 and 170 mg/L. The existing forms of adsorbed-Cr were iron oxide-bound Cr (40.80%–87.85%), sulfide-bound Cr (4.04%–20.28%) and residue (6.60%–33.72%). All the components started to react as soon as bauxite residue was added. Cr did not precipitate in the presence of high alkalinity bauxite residue due to the slow release of alkalinity maintaining pH < 6, thus producing Cr(OH)2+, Cr2(OH)24+ and Cr3(OH)45+ by hydrolysis without precipitation. Fe2O3 and Al-containing components were the main active phases for Cr (Ⅲ) removal, with the reaction time lasting more than 2 h and producing Ca6Al4Cr2O15, AlCr2, (Si, Al)2O4, Fe(Cr, Al)2O4, FeCr2Si3O12, MgCr0·1Fe1·9O4 and MgCr0·4Fe1·6O4. Finally, bauxite residue was granulated and used for column tests. Cr (Ⅲ) wastewater (1 and 50 mg/L) was treated and the effluent can meet the first level of the Shanghai standard (0.1 mg/L) defined by Integrated Wastewater Discharge Standard (DB 31/199–2009)." @default.
• W2994877144 created "2019-12-26" @default.
• W2994877144 creator A5015959050 @default.
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• W2994877144 date "2020-04-01" @default.
• W2994877144 modified "2023-10-15" @default.
• W2994877144 title "Removal of Cr (Ⅲ) from aqueous solution by using bauxite residue (red mud): Identification of active components and column tests" @default.
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• W2994877144 doi "https://doi.org/10.1016/j.chemosphere.2019.125560" @default.
• W2994877144 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31864065" @default.
• W2994877144 hasPublicationYear "2020" @default.
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