Visible light-driven photocatalytic degradation of methylene blue dye over bismuth-doped cerium oxide mesoporous nanoparticles

Veedu, Sajith N; Jose, Sheethu; Narendranath, Soumya B.; Kurup, M.R. Prathapachandra; Periyat, Pradeepan

doi:10.1007/s11356-020-10750-y

Cited by 27 publications

(15 citation statements)

References 35 publications

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“…Shanavas et al used nitrates in NaOH, heated to 140 • C for 14 h and then firing at 350 • C for 3 h to remove surface impurities [97]. Veedu et al used nitrates in ammonia and HCl, heated to 100 • C and then firing to 500 • C [98].…”

Section: Main Group Substituentsmentioning

confidence: 99%

“…Shanavas et al used nitrates in NaOH, heated to 140 °C then firing at 350 °C for 3 h to remove surface impurities [97]. Veedu et al use ammonia and HCl, heated to 100 °C and then firing to 500 °C [98]. Unlike bismuth, which is found in the +3 oxidation state when included earlier member of Group 15, antimony, has been shown to be present in the + state: this is the case whether SbCl3 or SbCl5 is used under hydrothermal cond presence of NaOH and H2O2 [99].…”

Section: Main Group Substituentsmentioning

confidence: 99%

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Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

et al. 2021

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We review the solution-based synthesis routes to cerium oxide materials where one or more elements are included in place of a proportion of the cerium, i.e., substitution of cerium is performed. The focus is on the solvothermal method, where reagents are heated above the boiling point of the solvent to induce crystallisation directly from the solution. This yields unusual compositions with crystal morphology often on the nanoscale. Chemical elements from all parts of the periodic table are considered, from transition metals to main group elements and the rare earths, including isovalent and aliovalent cations, and surveyed using the literature published in the past ten years. We illustrate the versatility of this synthesis method to allow the formation of functional materials with applications in contemporary applications such as heterogeneous catalysis, electrodes for solid oxide fuel cells, photocatalysis, luminescence and biomedicine. We pick out emerging trends towards control of crystal habit by use of non-aqueous solvents and solution additives and identify challenges still remaining, including in detailed structural characterisation, the understanding of crystallisation mechanisms and the scale-up of synthesis.

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Section: Main Group Substituentsmentioning

confidence: 99%

Section: Main Group Substituentsmentioning

confidence: 99%

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

et al. 2021

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“…Additionally, its low carrier mobility impedes the flow of photogenerated electrons either to the surface or to the interface, hindering its catalytic behavior and thus directly reducing the lifetime of the carriers. [30][31][32][33][34][35] Thus, chemical functionalization, such as doping, is an excellent strategy for tuning its properties (bandgap, electronic and optical) and making it suitable for the above-mentioned applications. Defects, especially oxygen vacancies, play a crucial role in tuning the photocatalytic properties of ceria.…”

Section: Introductionmentioning

confidence: 99%

Bandgap Engineering in Novel Fluorite‐Type Rare Earth High‐Entropy Oxides (RE‐HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications

Nundy

Tatar

Kojčinović

et al. 2022

Advanced Sustainable Systems

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Five different rare‐earth‐based nanocrystalline high entropy oxides (HEOs) with fluorite structure and average crystallite sizes between 6 and 8 nm are prepared and their photocatalytic behavior toward azo dye degradation and photoelectrochemical water splitting for hydrogen generation is examined. The cationic site in the fluorite lattice consists of five equimolar elements selected from the group of rare‐earth elements including La, Ce, Pr, Eu, and Gd and second‐row transition metals, Y and Zr. The studied HEOs exhibit bandgaps in the range from 1.91 to 3.0 eV and appropriate valence and conduction bands for water splitting. They reveal high photocatalytic activity that is mostly attributed to the accessibility of more photocatalytic active sites, which provide radicals responsible for the azo dye degradation. The materials successfully produce hydrogen by photocatalytic water splitting, suggesting the potential of HEOs as new photocatalysts. The photocatalytic performances of all studied HEOs outperform the single fluorite oxides or equivalent mixed oxides. The Ce0.2Zr0.2La0.2Pr0.2Y0.2O2 (CZLPY) engender hydrogen in 9.2 µmol mg−1 per hour that is much higher content than for pristine CeO2 material which amounts to 0.8 µmol mg−1 per hour.

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“…•− , whereas the holes in the valence bands oxidize H 2 O to produce •OH. 51,52 Thus, the generation of oxygen vacancies significantly enhances the photothermal and photodynamic performances of CeO 2−x @HA. The detailed mechanism lays the foundation for further utilization in the PDT and PTT combined treatment of tumors.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

NIR-II-Responsive CeO_2–x@HA Nanotheranostics for Photoacoustic Imaging-Guided Sonodynamic-Enhanced Synergistic Phototherapy

Peng

Wen

et al. 2022

Langmuir

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The therapeutic effect of photothermal therapy (PTT) and photodynamic therapy (PDT) is severely limited because of the shallow tissue penetration depth of the first near-infrared (NIR-I) light. Multifunctional nanotheranostics irradiated by the second nearinfrared (NIR-II) light have received wide interest with respect to deeper tissue penetration, and sonodynamic therapy (SDT) synergistic phototherapy can achieve the complete elimination of tumors. Herein, we successfully constructed a single NIR-II light-induced nanotheranostic using cerium oxide (CeO 2−x ) with abundant oxygen vacancies for photoacoustic imaging-guided SDT-enhanced phototherapy for the first time. CeO 2−x with surface crystalline disorder showed extensive NIR-II region absorption and an outstanding photothermal conversion ability. In addition, the CeO 2−x layer with numerous oxygen defects can promote the separation of holes and electrons by ultrasound irradiation, which can remarkably enhance the efficacy of phototherapy to achieve high-efficiency tumor ablation. CeO 2−x was surface modified with hyaluronic acid (HA) to prepare CeO 2−x @HA to allow active tumor targeting efficiency. Both cell and animal experiments confirmed that all-in-one CeO 2−x @HA exhibited a high therapeutic efficacy of SDT-enhanced PDT/PTT under 1064 nm laser irradiation, which achieved complete tumor eradication without systemic toxicity. This study significantly broadened the application of NIR-II-responsive CeO 2−x for photoacoustic imaging-mediated SDT-enhanced phototherapy to the highly efficient and precise elimination of tumors.

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Visible light-driven photocatalytic degradation of methylene blue dye over bismuth-doped cerium oxide mesoporous nanoparticles

Cited by 27 publications

References 35 publications

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

Bandgap Engineering in Novel Fluorite‐Type Rare Earth High‐Entropy Oxides (RE‐HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications

NIR-II-Responsive CeO_2–x@HA Nanotheranostics for Photoacoustic Imaging-Guided Sonodynamic-Enhanced Synergistic Phototherapy

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Visible light-driven photocatalytic degradation of methylene blue dye over bismuth-doped cerium oxide mesoporous nanoparticles

Cited by 27 publications

References 35 publications

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

Bandgap Engineering in Novel Fluorite‐Type Rare Earth High‐Entropy Oxides (RE‐HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications

NIR-II-Responsive CeO2–x@HA Nanotheranostics for Photoacoustic Imaging-Guided Sonodynamic-Enhanced Synergistic Phototherapy

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Product

Resources

About

NIR-II-Responsive CeO_2–x@HA Nanotheranostics for Photoacoustic Imaging-Guided Sonodynamic-Enhanced Synergistic Phototherapy