Highly effective magnet-responsive LDH-Fe oxide composite adsorbents for As(V) removal
| Autor: | W. M. Woch, Paulina Maziarz, Agnieszka Radziszewska, Tomasz Strączek, Tiina Leiviskä, W. Tokarz, Czesław Kapusta, Jakub Matusik |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Iron oxide Maghemite 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound Adsorption law Environmental Chemistry Calcination Fourier transform infrared spectroscopy Aqueous solution General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry engineering Hydroxide 0210 nano-technology Superparamagnetism Nuclear chemistry |
| Zdroj: | Chemical Engineering Journal. 362:207-216 |
| ISSN: | 1385-8947 |
| Popis: | In this study the layered double hydroxide (LDH) with Mg:Al molar ratio of 2:1 synthesized using co-precipitation method was impregnated with iron oxide particles (10 and 25 wt% loading). The calcined and uncalcined composites application for As(V) removal from aqueous solutions was studied. The XRD, Mossbauer spectroscopy, SEM and vibrating sample magnetometry studies confirmed the presence of superparamagnetic maghemite (γ-Fe2O3) particles having the size of ∼30 nm on the LDH surface. The FTIR studies revealed co-intercalation of carbonates and sulfates in the interlayer space of LDH. The composites showed outstanding As(V) adsorption properties. For the calcined composites a slightly higher adsorption capacity was observed which was connected with incorporation of As(V) anions into interlayer space during LDH structure reconstruction. Moreover the experiments of As(V) removal at low concentrations (3.75–0.37 mg/L) showed high selectivity and efficiency in As(V) removal, when LDH was impregnated with iron oxide particles ( |
| Databáze: | OpenAIRE |
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