| Autor: |
Ani Idris, Noordin Mohd Yusof, Effaliza Misran |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Journal of Industrial and Engineering Chemistry. 18:2151-2156 |
| ISSN: |
1226-086X |
| DOI: |
10.1016/j.jiec.2012.06.011 |
| Popis: |
In this study the toxic Cr(VI) which is a common pollutant to the environment is removed from the aqueous solution using the one step photocatalytic reduction to Cr(III) using PVA-alginate encapsulated γFe2O3 magnetic beads. The photocatalytic reduction of Cr(VI) by PVA-alginate encapsulated γFe2O3 magnetic beads was examined under sunlight and other 4 types of lamp: xenon lamp, black light bulb (BLB) lamp, light emitting diode (LED) lamp and fluorescent lamp. The experiments were performed at pH 1, initial Cr(VI) = 50 mg/L and the photocatalyst dosage of maghemite nanoparticles was kept at 8% (v/v). Removal of Cr(VI) was best under sunlight; 100% removal in 30 min, followed by xenon lamp; 100% removal in 100 min, BLB lamp; 70% removal in 100 min. LED and fluorescent lamp have about the same removal rate; 50% removal in 100 min. The Cr(VI) reduction using PVA-alginate magnetic beads fitted the Langmuir–Hinshelwood (L–H) kinetics model with a correlation coefficient (R2) of 0.972. The PVA-alginate magnetic beads were capable of treating industrial chromium waste containing 300 mg/L Cr(VI) within 2 h under sunlight. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect