Fabrication of Gd-La codoped TiO2 composite via a liquid phase plasma method and its application as visible-light photocatalysts

Lee, Heon; Park, In-Soo; Bang, Hye-Jin; Park, Young-Kwon; Kim, Hangun; Ha, Hyung‐Ho; Kim, Byung-Joo; Jung, Sang‐Chul

doi:10.1016/j.apsusc.2018.11.249

Cited by 35 publications

(8 citation statements)

References 51 publications

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“…Keeping in line with the majority of studies in the literature, one could argue that lower photocatalytic activity was observed despite higher anatase content, not because of it, since anatase is usually perceived as the more active phase. While many authors found that modification with RE might be beneficial to photocatalytic activity, at least for some elements [ 55 , 56 , 57 ], we have found this not to be the case for any of the three methods used for measuring photocatalytic activity. Figure 9 and Figure 10 compare the different methods of photocatalytic activity measurements.…”

Section: Resultscontrasting

confidence: 81%

Hydrothermal Synthesis of Rare-Earth Modified Titania: Influence on Phase Composition, Optical Properties, and Photocatalytic Activity

et al. 2019

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In order to expand the use of titania indoor as well as to increase its overall performance, narrowing the band gap is one of the possibilities to achieve this. Modifying with rare earths (REs) has been relatively unexplored, especially the modification of rutile with rare earth cations. The aim of this study was to find the influence of the modification of TiO2 with rare earths on its structural, optical, morphological, and photocatalytic properties. Titania was synthesized using TiOSO4 as the source of titanium via hydrothermal synthesis procedure at low temperature (200 °C) and modified with selected rare earth elements, namely, Ce, La, and Gd. Structural properties of samples were determined by X-ray powder diffraction (XRD), and the phase ratio was calculated using the Rietveld method. Optical properties were analyzed by ultraviolet and visible light (UV-Vis) spectroscopy. Field emission scanning electron microscope (FE-SEM) was used to determine the morphological properties of samples and to estimate the size of primary crystals. X-ray photoelectron spectroscopy (XPS) was used to determine the chemical bonding properties of samples. Photocatalytic activity of the prepared photocatalysts as well as the titania available on the market (P25) was measured in three different setups, assessing volatile organic compound (VOC) degradation, NOx abatement, and water purification. It was found out that modification with rare earth elements slows down the transformation of anatase and brookite to rutile. Whereas the unmodified sample was composed of only rutile, La- and Gd-modified samples contained anatase and rutile, and Ce-modified samples consisted of anatase, brookite, and rutile. Modification with rare earth metals has turned out to be detrimental to photocatalytic activity. In all cases, pure TiO2 outperformed the modified samples. Cerium-modified TiO2 was the least active sample, despite having a light absorption tail up to 585 nm wavelength. La- and Gd-modified samples did not show a significant shift in light absorption when compared to the pure TiO2 sample. The reason for the lower activity of modified samples was attributed to a greater Ti3+/Ti4+ ratio and a large amount of hydroxyl oxygen found in pure TiO2. All the modified samples had a smaller Ti3+/Ti4+ ratio and less hydroxyl oxygen.

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Section: Resultscontrasting

confidence: 81%

Hydrothermal Synthesis of Rare-Earth Modified Titania: Influence on Phase Composition, Optical Properties, and Photocatalytic Activity

et al. 2019

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“…The LPP reactor was manufactured in a double tube type, and in order to prevent the temperature increase due to heat generated by plasma generation, cooling water was circulated in the outer channel of the reactor to keep the temperature of the reactant solution constant at 15 °C. The Ag/ACF composite preparation process using the LPP method was performed in the following order [14,18]. The detailed configuration and specifications of the LPP system used in this experiment are described elsewhere.…”

Section: Preparation Of Silver Nanoparticle Precipitated Acfmentioning

confidence: 99%

“…On the other hand, the liquid phase plasma (LPP) method has attracted recent attention [11,12]. The LPP process is a kind of cold plasma process in which plasma is generated by applying a high voltage to an electrode installed in a liquid [13,14]. Wastewater treatment, hydrogen production, nanoparticle synthesis, and the fabrication of various composites can be prepared using various radicals and electrons in the plasma field formed in the reaction aqueous solution [15,16].…”

Section: Introductionmentioning

confidence: 99%

Acetaldehyde Adsorption Characteristics of Ag/ACF Composite Prepared by Liquid Phase Plasma Method

Kim

Shim

et al. 2021

Nanomaterials

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Ag particles were precipitated on an activated carbon fiber (ACF) surface using a liquid phase plasma (LPP) method to prepare a Ag/ACF composite. The efficiency was examined by applying it as an adsorbent in the acetaldehyde adsorption experiment. Field-emission scanning electron microscopy and energy-dispersive X-ray spectrometry confirmed that Ag particles were distributed uniformly on an ACF surface. X-ray diffraction and X-ray photoelectron spectroscopy confirmed that metallic silver (Ag0) and silver oxide (Ag2O) precipitated simultaneously on the ACF surface. Although the precipitated Ag particles blocked the pores of the ACF, the specific surface area of the Ag/ACF composite material decreased, but the adsorption capacity of acetaldehyde was improved. The AA adsorption of ACF and Ag/ACF composites performed in this study was suitable for the Dose–Response model.

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“…Gadolinium (Gd) 0-6 % doped TiO2 was synthesized by sol-gel spin coating methods, and their photocatalytic degradation activity of Rhodamine-B (RhB) dye was studied [15]. TiO2 was doped Gd, and La same time decrease optical bandgaps and so increase photocatalytic activity was reported [16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Gd doped TiO2 Thin Film for Photocatalytic Degradation of Malachite Green

Eskalen

Kerli²

2020

Sakarya University Journal of Science

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In this research work, a simple spray pyrolysis method was employed to synthesized gadolinium (Gd) doped titanium oxide (TiO2) thin film. The crystal structure and morphology of the sample was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). According to XRD measurements, no apparent crystal peak was observed. The thickness of the prepared film was found to be 228 nm from SEM observation. The optical transmittance and bandgap energy of the synthesized thin film was investigated by using UV-Vis spectroscopy. The high transmission of the thin film was found in the visible region. The optical bandgap energy of the prepared film was found to be 2.85 eV. The photocatalytic degradation of malachite green solution was studied. As a result of the photocatalytic experiment, the thin film could be used as an effective photocatalyst for malachite green dye.

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Fabrication of Gd-La codoped TiO2 composite via a liquid phase plasma method and its application as visible-light photocatalysts

Cited by 35 publications

References 51 publications

Hydrothermal Synthesis of Rare-Earth Modified Titania: Influence on Phase Composition, Optical Properties, and Photocatalytic Activity

Hydrothermal Synthesis of Rare-Earth Modified Titania: Influence on Phase Composition, Optical Properties, and Photocatalytic Activity

Acetaldehyde Adsorption Characteristics of Ag/ACF Composite Prepared by Liquid Phase Plasma Method

Synthesis of Gd doped TiO2 Thin Film for Photocatalytic Degradation of Malachite Green

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