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Crystallization of well-defined anatase nanoparticles in SBA-15 for the photocatalytic decomposition of acetic acid.

ABSTRACT: Anatase nanoparticles with a size of ca. 5 nm were prepared in mesoporous silica (SBA-15 with the pore diameter of 6 nm) by impregnation of the precursor derived from titanium tetraisopropoxide and subsequent heat treatment in air. The mesoporous structure of the anatase-silica hybrid and the size of the anatase particles were kept unchanged during the crystallization of anatase at 200-600 °C. The hybrids were applied as a photocatalyst for the decomposition of acetic acid in water under UV irradiation to find the heat treatment over 400 °C led to higher efficiency of the reaction (45-55 μmol h^-1 of carbon-dioxide production) over the samples heated at temperatures lower than 300 °C (3-14 μmol h^-1 of carbon-dioxide production).

SUBMITTER: Vibulyaseak KG

PROVIDER: S-EPMC9056609 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Crystallization of well-defined anatase nanoparticles in SBA-15 for the photocatalytic decomposition of acetic acid.

Vibulyaseak Kasimanat Guy KG Ohtani Bunsho B Ogawa Makoto M

RSC advances 20200901 54

Anatase nanoparticles with a size of <i>ca.</i> 5 nm were prepared in mesoporous silica (SBA-15 with the pore diameter of 6 nm) by impregnation of the precursor derived from titanium tetraisopropoxide and subsequent heat treatment in air. The mesoporous structure of the anatase-silica hybrid and the size of the anatase particles were kept unchanged during the crystallization of anatase at 200-600 °C. The hybrids were applied as a photocatalyst for the decomposition of acetic acid in water under ...[more]

PMID: 35516506

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Project description:Octahedral anatase particles (OAP) with eight exposed and thermodynamically most stable (101) facets were prepared by an ultrasonication-hydrothermal (US-HT) reaction from potassium titanate nanowires (TNW). The precursor (TNW) and the product (OAP) of US-HT reaction were modified with nanoparticles of noble metals (Au, Ag or Pt) by photodeposition. Samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), scanning transmission electron microscopy (STEM) and time-resolved microwave conductivity (TRMC). The photocatalytic activity was investigated in three reaction systems, i.e., anaerobic dehydrogenation of methanol and oxidative decomposition of acetic acid under UV/vis irradiation, and oxidation of 2-propanol under vis irradiation. It was found that hydrogen liberation correlated with work function of metals, and thus the most active were platinum-modified samples. Photocatalytic activities of bare and modified OAP samples were much higher than those of TNW samples, probably due to anatase presence, higher crystallinity and electron mobility in faceted NPs. Interestingly, noble metals showed different influence on the activity depending on the semiconductor support, i.e., gold-modified TNW and platinum-modified OAP exhibited the highest activity for acetic acid decomposition, whereas silver- and gold-modified samples were the most active under vis irradiation, respectively. It is proposed that the form of noble metal (metallic vs. oxidized) as well as the morphology (well-organized vs. uncontrolled) have a critical effect on the overall photocatalytic performance. TRMC analysis confirmed that fast electron transfer to noble metal is a key factor for UV activity. It is proposed that the efficiency of plasmonic photocatalysis (under vis irradiation) depends on the oxidation form of metal (zero-valent preferable), photoabsorption properties (broad localized surface plasmon resonance (LSPR)), kind of metal (silver) and counteraction of "hot" electrons back transfer to noble metal NPs (by controlled morphology and high crystallinity).

Dataset Information

Crystallization of well-defined anatase nanoparticles in SBA-15 for the photocatalytic decomposition of acetic acid.

Publications

Crystallization of well-defined anatase nanoparticles in SBA-15 for the photocatalytic decomposition of acetic acid.

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