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All Journal Indonesian Journal of Chemistry
Ahmed, Luma Majeed
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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SDS-Assisted Hydrothermal Growth and Photocatalytic Activity of Like-Caviar MoFe2O4 Nanoparticle Decorated with Al2O3 Hameed, Mohammed Ali; Ahmed, Luma Majeed
Indonesian Journal of Chemistry Vol 24, No 3 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.88444

Abstract

Like-caviar molybdenum ferrite nanoparticles (MoFe2O4 NPs) have been successfully synthesized via a hydrothermal route in the presence of the negative surfactant (sodium dodecyl sulfate (SDS)). SDS acts as a template, stabilizer, and stops the aggregating process through storage. The mean crystal size of MoFe2O4 NPs rises with decorating it with Al2O3. Based on SEM analysis, the shapes of MoFe2O4, Al2O3, and their composite demonstrated like-caviar, like-brain cells, and like-grains, respectively. Al2O3 has been chosen to incorporate with spinel MoFe2O4 to make it color more light, this crucial step is necessary to enhance their optical characteristics. FTIR spectra observed the MoFe2O4 NPs are inverse spinel. The photo-decolorization test employs indigo carmine (IC) as a model pollutant. The quantum yields (Φ) of IC dye decolorization with studied photocatalysts are low, which may be created by quencher materials, dimerization of dye molecules, and photophysical deactivation processes (ISC process). Moreover, the photocatalytic activity of using MoFe2O4 raised after being decorated with alumina, which revealed an increase in the surface acidity, hydroxyl group adsorption, size, band gap, pHpzc of MoFe2O4 from 2.9–3.6 to 4.2–5.9 after decorated alumina. This pH is suitable for decolorizing IC dye, which has a pH of solution equal to 5.3.
Preparation of Au-Doped Two-Phase TiO2 Nanoparticles by One-Step Method as Photocatalytic Applications Neama, Rasha Jameel; Alosfur, Firas Kamel Mohamad; Tahir, Khawla Jemeal; Ridha, Noor Jawad; Ahmed, Luma Majeed
Indonesian Journal of Chemistry Vol 24, No 4 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.92687

Abstract

The synthesis of pure TiO2 and X% Au/TiO2 NPs was achieved via a sol-gel technique. The influence of Au concentration on structural, morphological, and optical features, as well as photocatalytic activity, was studied. XRD analysis revealed the presence of crystallized titanium consisting of anatase and rutile phases. The surface composition and electronic structure of TiO2 and X% Au/TiO2 catalysts were investigated using XPS analysis. Au/TiO2 consists of Ti 2p, O 1s, and Au 4f regions from XPS analysis. FESEM and TEM were utilized to analyze the morphology of the samples. FTIR spectrum indicated the presence of OH, CH2, and Ti–O–Ti groups in TiO2 samples, with an additional peak at 2108.89 cm−1 indicating the presence of gold in X% Au/TiO2 samples. The specific surface area increased from 33.36 m2/g for pure TiO2 to 51.62 m2/g after the doping of 2.5% Au NPs. The incorporation of Au on the TiO2 surface significantly influenced the optical properties in the 490 to 590 nm region, observed through the UV-vis absorption spectrum. The 2% Au/TiO2 NPs exhibited higher catalytic activity than pure TiO2, degrading methylene blue dye by 72.43% within 120 min.
Co-Authors Alosfur, Firas Kamel Mohamad Hameed, Mohammed Ali Neama, Rasha Jameel Ridha, Noor Jawad Tahir, Khawla Jemeal