Novel KMnO4-modified iron oxide for effective arsenite removal
| Autor: | Yu Jen Shih, Fu-Ji Cheng, Yao Hui Huang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Langmuir
Environmental Engineering Goethite Arsenites Health Toxicology and Mutagenesis Iron oxide chemistry.chemical_element Ferric Compounds chemistry.chemical_compound Adsorption Potassium Permanganate X-Ray Diffraction Specific surface area Environmental Chemistry Freundlich equation Waste Management and Disposal Arsenic Arsenite Chromatography Pollution Models Chemical chemistry visual_art Microscopy Electron Scanning visual_art.visual_art_medium Crystallization Nuclear chemistry |
| Zdroj: | Journal of Hazardous Materials. 198:1-6 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2011.10.010 |
| Popis: | This work demonstrates the synthesis of a novel KMnO 4 -modified form of iron oxide, MnBT-4, using a fluidized bed reactor (FBR) for the adsorptive removal of arsenic (III)/(V). Characterization by XRD, BET, and SEM indicated that the BT-4 support was poorly crystallized goethite (α-FeOOH) with a specific surface area of 229 m 2 g −1 . In FBR experiments of synthesizing MnBT-4, the Fe and Mn salts were found to have an optimal dosage ratio of less than 4, which maximized the KMnO 4 immobilization efficiency. The immobilized Mn compounds on MnBT-4 underwent an additional oxidation step of As (III), promoting arsenic adsorption. When applied MnBT-4 for As (III) removal from solution, the sorption isotherm was accurately fitted with Langmuir and Freundlich models, while the maximum adsorption capacity of 27.4 mg g −1 exceeded those of other adsorbents in the literature. Batch experimental results revealed that both raw BT-4 and MnBT-4 could take up a large amount of As (V). However, the MnBT-4 provided a substantially higher As (III) removal efficiency than BT-4. |
| Databáze: | OpenAIRE |
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