Synthesis of tantalum pentoxide hollow spheres utilizing a sacrificial templating approach

Abdelaal, Haitham Mohammad; Pfeifer, Erik; Grünberg, Christina; Harbrecht, Bernd

doi:10.1016/j.matlet.2014.08.023

Cited by 16 publications

(5 citation statements)

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“…), applied widely in the elds of photocatalysis, dye-sensitized solar cell and gas sensor. [14][15][16][17][18] Apart from polymers, 19 carbohydrates, such as xylose, 20 glucose, 11,12,[21][22][23] fructose, 20,24 sucrose, 11,22 starch, 22 cellulose, 11,25 and cyclodextrins, 26 have been frequently used as raw materials to synthesize carbonaceous spheres by HTC process. Although these particles synthesized are in the size range of 0.2-10 mm, carbonaceous spheres with uniform size are difficult to be found among these cases.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for the formation and growth of carbonaceous spheres from sucrose by hydrothermal carbonization

Zhang

et al. 2016

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Mechanism for the formation and growth of carbonaceous spheres from sucrose by hydrothermal carbonization

Zhang

et al. 2016

RSC Adv.

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“…Third, it also can solve the problem of diversification of photocatalytic sites by a synergistic effect for the improving the photocatalytic activity. However, a series of nanocomposites have been developed by Ta 2 O 5 or/and TiO 2 , including hollow-sphere TiO 2 , hollow-sphere Ta 2 O 5 , , hollow-sphere TiO 2 –Au–TiO 2 , , the mesoporous Ta 2 O 5 , NO x –Ta 2 O 5 , and Ta 2 O 5 –TiO 2 , for the degradation of organic pollutants or water splitting for H 2 . To date, positively and negatively charged, double-shelled, Au-sandwiched TiO 2 -based photocatalyst H–Ta 2 O 5 @Au@TiO 2 as a photocatalyst has still not been reported.…”

Section: Introductionmentioning

confidence: 99%

Positively and Negatively Charged Double Shell with Au Sandwich for Protecting and Enhancing Photocatalytic Activity of TiO₂-Based Photocatalyst

Zheng

Liu

et al. 2021

J. Phys. Chem. C

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Enhancing selectivity and high affinity between a photocatalyst and target pollutants, preventing photocatalytic poisoning from degradation intermediates, and improving photocatalytic performance are three challenges for a heterogeneous photocatalyst that can be unlocked by a positively and negatively charged double shell with a Au sandwich. At pH 4.0, Ta 2 O 5 and TiO 2 shells are positively and negatively charged, respectively. Cationic dyes (Rhodamine B (RhB)) and double shelled Ta 2 O 5 @ Au@TiO 2 hollow spheres are chosen for a proof-of-concept study. The photocatalytic activity is in the order of double shelled Ta 2 O 5 @Au@TiO 2 hollow spheres > Ta 2 O 5 hollow spheres > TiO 2 hollow spheres. The photocatalytic performance of double shelled Ta 2 O 5 @Au@TiO 2 hollow spheres benefits from hollow spheres avoiding the reunion and more diverse heterophase junctions than Ta 2 O 5 , TiO 2 , and Au. Impressively, by electrostatic attraction and repulsion, cationic RhB is selectively enriched onto the negatively charged Ta 2 O 5 shell, and then, RhB and an intermediate are excluded into the positively charged inner TiO 2 shell, i.e., the poisoning on TiO 2 is avoided. Au is embedded in the middle to promote the transmission of photogenerated electrons, which is helpful to decompose the intermediates and RhB, so the poisoning on Ta 2 O 5 can be relieved.

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“…Since the pioneering works on the synthesis of hollow materials at the beginning of the 80s reported by Kowalski et al, the hollow materials represent a special type of materials which are of significant regard from both scientific and industrial viewpoints due to their unique properties, especially the low density, the extremely large specific surface area, porous structure and the hollow cores …”

Section: Introductionmentioning

confidence: 99%

“…It is usually based on the production of core@shell composite particles. Then, the selective removal of the core is achieved by soaking the formed composite material in solvent or heat . The advantage of template directed synthesis approach is ascribed to the ease of the manipulation of hollow materials.…”

Section: Introductionmentioning

confidence: 99%

Approachable Way to Synthesize 3D Silica Hollow Nanospheres with Mesoporous Shells via Simple Template‐Assisted Technique

Abdelaal

Harbrecht

2016

ChemistrySelect

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3D porous silica hollow nanospheres (PSHNSs) with mesoporous walls have been successfully fabricated by simple template-assisted method using tetraethoxysilan (TEOS) as a silica precursor and glucose-derived functionalized carbon spheres (FCSs) as hard templates. Template-precursor hybrid composite spheres were formed by direct adsorption of the silica precursor onto the surface layers of the FCSs. After etching of the template via oxidation in air, free standing 3D PSHNSs were obtained. The resulting PSHNSs were~85 nm in size as indicated by both SEM and TEM images. BET analysis has shown that nanospheres to have a large specific surface area up to 400 m 2 /g. The fascinating structure of 3D PSHNSs may provide more accessibility and good contacts with reactants that is very important in the fields of catalysts, gas adsorbent, heavy metals removal, electronics, and so on.[a] Dr.

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Synthesis of tantalum pentoxide hollow spheres utilizing a sacrificial templating approach

Cited by 16 publications

References 16 publications

Mechanism for the formation and growth of carbonaceous spheres from sucrose by hydrothermal carbonization

Mechanism for the formation and growth of carbonaceous spheres from sucrose by hydrothermal carbonization

Positively and Negatively Charged Double Shell with Au Sandwich for Protecting and Enhancing Photocatalytic Activity of TiO₂-Based Photocatalyst

Approachable Way to Synthesize 3D Silica Hollow Nanospheres with Mesoporous Shells via Simple Template‐Assisted Technique

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Synthesis of tantalum pentoxide hollow spheres utilizing a sacrificial templating approach

Cited by 16 publications

References 16 publications

Mechanism for the formation and growth of carbonaceous spheres from sucrose by hydrothermal carbonization

Mechanism for the formation and growth of carbonaceous spheres from sucrose by hydrothermal carbonization

Positively and Negatively Charged Double Shell with Au Sandwich for Protecting and Enhancing Photocatalytic Activity of TiO2-Based Photocatalyst

Approachable Way to Synthesize 3D Silica Hollow Nanospheres with Mesoporous Shells via Simple Template‐Assisted Technique

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Positively and Negatively Charged Double Shell with Au Sandwich for Protecting and Enhancing Photocatalytic Activity of TiO₂-Based Photocatalyst