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  1. Artikel ; Online: Determination of dissolved iron redox species in freshwater sediment using DGT technique coupled to BDS

    Hanna Budasheva / Aleksander Kravos / Dorota Korte / Arne Bratkič / Yue Gao / Mladen Franko

    Acta Chimica Slovenica, Vol 66, Iss 1, Pp 239-

    2019  Band 246

    Abstract: In this work we have developed a novel method for determination of iron redox species by the use of diffusive gradients in thin-film (DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved low ... ...

    Abstract In this work we have developed a novel method for determination of iron redox species by the use of diffusive gradients in thin-film (DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved low limit of detection (LOD) of 0.14 μM for Fe (II) ions. The total Fe concentration determined in the Vrtojbica river sediment (Slovenia, Rožna Dolina, 5000 Nova Gorica) was 49.3 µgL-1. The Fe (II) and Fe (III) concentration amounted to 12.8 µgL-1 and 39.9 µgL-1, respectively. Such an approach opens new opportunities for monitoring the content of iron species in natural waters and sediments and provides highly sensitive chemical analysis and an accurate qualitative and quantitative characteristic of the materials under study.
    Schlagwörter Beam deflection spectroscopy ; diffusive gradients in thin-film technique ; iron redox species ; photothermal techniques ; sediment ; Chemistry ; QD1-999
    Sprache Englisch
    Erscheinungsdatum 2019-02-01T00:00:00Z
    Verlag Slovenian Chemical Society
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Synthesis and Characterization of MWCNT-COOH/Fe 3 O 4 and CNT-COOH/Fe 3 O 4 /NiO Nanocomposites

    Adina Stegarescu / Humberto Cabrera / Hanna Budasheva / Maria-Loredana Soran / Ildiko Lung / Francesca Limosani / Dorota Korte / Matteo Amati / Gheorghe Borodi / Irina Kacso / Ocsana Opriş / Monica Dan / Stefano Bellucci

    Nanomaterials, Vol 12, Iss 3008, p

    Assessment of Adsorption and Photocatalytic Performance

    2022  Band 3008

    Abstract: In this study the adsorption and photodegradation capabilities of modified multi-walled carbon nanotubes (MWCNTs), using tartrazine as a model pollutant, is demonstrated. MWCNT-COOH/Fe 3 O 4 and MWCNT-COOH/Fe 3 O 4 /NiO nanocomposites were prepared by ... ...

    Abstract In this study the adsorption and photodegradation capabilities of modified multi-walled carbon nanotubes (MWCNTs), using tartrazine as a model pollutant, is demonstrated. MWCNT-COOH/Fe 3 O 4 and MWCNT-COOH/Fe 3 O 4 /NiO nanocomposites were prepared by precipitation of metal oxides in the presence of MWCNTs. Their properties were examined by X-ray diffraction in powder (XRD), Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy, synchrotron-based Scanning PhotoElectron Microscopy (SPEM), and Brunauer-Emmett-Teller (BET) analysis. It was found that the optimal adsorption conditions were pH 4 for MWCNT-COOH/Fe 3 O 4 and pH 3 for MWCNT-COOH/Fe 3 O 4 /NiO, temperature 25 °C, adsorbent dose 1 g L −1 , initial concentration of tartrazine 5 mg L −1 for MWCNT-COOH/Fe 3 O 4 and 10 mg L −1 for MWCNT-COOH/Fe 3 O 4 /NiO and contact time 5 min for MWCNT-COOH/Fe 3 O 4 /NiO and 15 min for MWCNT-COOH/Fe 3 O 4 . Moreover, the predominant degradation process was elucidated simultaneously, with and without simulated sunlight irradiation, using thermal lens spectrometry (TLS) and UV–Vis absorption spectrophotometry. The results indicated the prevalence of the photodegradation mechanism over adsorption from the beginning of the degradation process.
    Schlagwörter carbon nanotubes ; magnetite ; tartrazine ; photodegradation ; adsorption ; water decontamination ; Chemistry ; QD1-999
    Thema/Rubrik (Code) 290 ; 669
    Sprache Englisch
    Erscheinungsdatum 2022-08-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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