Microflowery, Microspherical, and Fan-Shaped TiO2 Crystals via Hierarchical Self-Assembly of Nanorods with Exposed Specific Crystal Facets and Enhanced Photocatalytic Performance

Du, Yi‐en; Niu, Xianjun; Hou, Kai; He, Xinru; Zhang, Caifeng

doi:10.3390/catal12020232

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…However, wide-bandgap semiconductors fall short because of their inability to use the visible portion of the solar spectrum. In addition, an electron-hole, created due to UV excitation, faces quick recombination to slow down the catalysis process of wide-bandgap semiconductors [7][8][9]. Improvement in the efficiency of photocatalytic activity of these semiconductor materials can be further made possible by the formation of suitable heterojunctions with other semiconductors and noble metals, and by doping with metals, nonmetals, and rare earth metals [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

et al. 2023

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Noble metal decorated semiconductor photocatalysts have paid noticeable attention owing to their enhanced photocatalytic activity. Herein, we have synthesized pure rutile phase of TiO2 nanorods composed microflowers morphology by hydrothermal method and decorated them with Au to observe plasmon-induced enhanced photocatalytic efficiency. The optical bandgap engineering through Au decorated TiO2 introduced midgap states, that helps in charge compensation during photodegradation study. The surface plasmonic resonance peak of Au is observed along with the defect peak of TiO2, extending the absorption of the solar spectrum from UV to the visible region. The quenching in photoluminescence intensity with increased Au thickness indicates the formation of Schottky junction at the interface of Au and TiO2 that helps in reducing photo-generated charge carrier recombination. The softening of the Eg Raman mode and photothermal effect originated from the non-radiative decay of localized surface plasmon through electron-phonon and phonon-phonon relaxation. The photocatalytic degradation of Rhodamine 6G (R6G) is monitored by exposing the sample to UV and visible light sources under Raman spectroscopy. The Au decoration plays a crucial role in promoting charge separation, Schottky junction creation, photothermal effect, and UV to visible light absorption to enhance photocatalytic activity, which can be explained on the basis of the charge transfer mechanism. Our in-situ photo-degradation study at the interface of noble metal and semiconducting materials will pave the way to improve the understanding of plasmon-enhanced photocatalytic applications.

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Section: Introductionmentioning

confidence: 99%

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

et al. 2023

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Enhanced Photocatalytic Performance of HTO/TiO₂ Composites Prepared by Hydrothermal Soft Chemical Synthesis Under UV Irradiation

Du,

Wu,

Zhou

et al. 2024

ChemistrySelect

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White metatitanic acid H2TiO3 (HTO)/TiO2 composites with co‐exposed [111]‐, {010} and {101} facets were successfully synthesized by employing the white suspension of [TMA+]2[TiO3]2− as the precursor via a hydrothermal soft chemical synthesis method in the presence or absence of 1‐ethyl‐3‐methylimidazolium bromide ([Emim]Br), 4‐bromine imidazole (Bmim) and 1‐methyl‐3‐propylimidazole tetrafluoroborate ([Pmim]BF4) ionic liquids. The structure, morphology, specific surface areas, microstructure, surface properties, and charge migration behaviors of HTO/TiO2 composites vary depending on the selected ionic liquid. The apparent rate constant of the Bmim‐HTO/TiO2 composite was the highest, at 0.0353 min−1, which was approximately 1.35, 1.38, 1.44, 2.67, and 88.25 times higher than that of [Pmim]BF4‐HTO/TiO2 (0.0262 min−1), [Emim]Br‐HTO/TiO2 (0.0256 min−1), No IL‐HTO/TiO2 (0.0245 min−1), CM‐TiO2 (0.0132 min−1) and Blank samples (0.0004 min−1), respectively. Compared with CM‐TiO2 and other HTO/TiO2 samples, the Bmim‐HTO/TiO2 composite featuring cuboid anatase TiO2 nanocrystals with co‐exposed [111]‐facets and {101} facets, exhibited superior photocatalytic activity in degrading methylene blue (MB) under ultraviolet light irradiation. This exceptional performance can be attributed to its cooperative effects, including a larger specific surface area, the co‐exposure of [111]‐ and {101} facets, a suitable heterojunction structure, and the most efficient charge carrier separation. This work introduces a hydrothermal soft chemical process for preparing HTO/TiO2 composite with controllable morphology and co‐exposed reactive facets, which holds promise for practical applications in removing organic pollutants from printing and dyeing wastewater.

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Synthesis of High-Energy Faceted TiO2 Nanocrystals with Enhanced Photocatalytic Performance for the Removal of Methyl Orange

Niu

et al. 2022

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In this work, brookite TiO2 nanocrystals with co-exposed {001} and {120} facets (pH0.5-T500-TiO2 and pH11.5-T500-TiO2), rutile TiO2 nanorod with exposed {110} facets and anatase TiO2 nanocrystals with exposed {101} facets (pH3.5-T500-TiO2) and {101}/{010} facets (pH5.5-T500-TiO2, pH7.5-T500-TiO2 and pH9.5-T500-TiO2) were successfully synthesized through a one-pot solvothermal method by using titanium (V) iso-propoxide (TTIP) colloidal solution as the precursor. The crystal structure, morphology, specific surface area, surface chemical states and photoelectric properties of the pHx-T500-TiO2 (x = 0.5, 1.5, 3.5, 5.5, 7.5, 9.5, 11.5) were characterized by powder X-ray diffraction (XRD), field scanning transmission electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), nitrogen adsorption instrument, X-ray photoelectron spectroscopy (XPS), UV-Visible diffuse reflectance spectra and electrochemical impedance spectroscopy (EIS). The photocatalytic activity performance of the pHx-T500-TiO2 samples was also investigated. The results showed that as-prepared pH3.5-T500-TiO2 nanocrystal with exposed {101} facets exhibited the highest photocatalytic activity (95.75%) in the process of photocatalytic degradation of methyl orange (MO), which was 1.1, 1.2, 1.2, 1.3, 1.4, 1.6, 10.7, 15.1 and 27.8 fold higher than that of pH5.5-T500-TiO2 (89.47%), P25-TiO2 (81.16%), pH9.5-T500-TiO2 (79.41%), pH7.5-T500-TiO2 (73.53%), pH0.5-T500-TiO2 (69.10%), CM-TiO2 (61.09%), pH11.5-T500-TiO2 (8.99%), pH1.5-T500-TiO2 (6.33%) and the Blank (3.44%) sample, respectively. The highest photocatalytic activity of pH3.5-T500-TiO2 could be attributed to the synergistic effects of its anatase phase structure, the smallest particle size, the largest specific surface area and exposed {101} facets.

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Microflowery, Microspherical, and Fan-Shaped TiO2 Crystals via Hierarchical Self-Assembly of Nanorods with Exposed Specific Crystal Facets and Enhanced Photocatalytic Performance

Cited by 3 publications

References 49 publications

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

Enhanced Photocatalytic Performance of HTO/TiO₂ Composites Prepared by Hydrothermal Soft Chemical Synthesis Under UV Irradiation

Synthesis of High-Energy Faceted TiO2 Nanocrystals with Enhanced Photocatalytic Performance for the Removal of Methyl Orange

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Microflowery, Microspherical, and Fan-Shaped TiO2 Crystals via Hierarchical Self-Assembly of Nanorods with Exposed Specific Crystal Facets and Enhanced Photocatalytic Performance

Cited by 3 publications

References 49 publications

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO2 microflowers

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO2 microflowers

Enhanced Photocatalytic Performance of HTO/TiO2 Composites Prepared by Hydrothermal Soft Chemical Synthesis Under UV Irradiation

Synthesis of High-Energy Faceted TiO2 Nanocrystals with Enhanced Photocatalytic Performance for the Removal of Methyl Orange

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Resources

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In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

Enhanced Photocatalytic Performance of HTO/TiO₂ Composites Prepared by Hydrothermal Soft Chemical Synthesis Under UV Irradiation