House-of-cards composites of MWW monolayers and TiO2 nanoparticles with (photo)catalytic activity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10487122" target="_blank" >RIV/00216208:11310/24:10487122 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=gBekw_F2t8" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=gBekw_F2t8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apmt.2024.102473" target="_blank" >10.1016/j.apmt.2024.102473</a>

Jazyk výsledku

angličtina

Název v původním jazyce

House-of-cards composites of MWW monolayers and TiO2 nanoparticles with (photo)catalytic activity

Popis výsledku v původním jazyce

The exfoliation of layered zeolites affording monolayer nanosheets in solution enables for the first time preparation of molecularly intimate composites of zeolites with other components like nanoparticles, other layers, etc. This ability is not possible with the conventional 3D and even solid 2D zeolite forms. It allows synthesizing composites with desired combination of functionalities and additional benefits like open accessible architectures. The present article illustrates this novel approach by reporting the preparation of catalysts comprising 2.5 nm thick monolayers of the zeolite MWW and TiO2 nanoparticles with approximate diameter 4-8 nm. The chosen ratio is 1:1 w/w but it is readily adjustable to different values if desired. Two solutions of exfoliated zeolite MWW monolayers were used: as-made and after purification by dialysis. The composites precipitated upon mixing with TiO2 nanoparticle solutions. TEM investigation confirmed random mixing of the components producing house-ofcards structures. The composites were additionally characterized by X-ray powder diffraction, nitrogen sorption and FTIR. The efficacy of the new approach was demonstrated through testing in two catalytic oxidation reactions, and both showed advantage over the equivalent physical mixture of the components. One of the test reactions, diphenyl sulfide oxidation by H2O2 revealed both catalytic (in the dark) and photocatalytic (with irradiation) activity. The hydroxylation of terephthalic acid occurred by radical oxidation. The presented approach can be applied to design desired systems, e.g., with other semiconductors to allow more precise control not only of the content in mixed phases but also of optical and electronic properties of these materials.

Název v anglickém jazyce

House-of-cards composites of MWW monolayers and TiO2 nanoparticles with (photo)catalytic activity

Popis výsledku anglicky

The exfoliation of layered zeolites affording monolayer nanosheets in solution enables for the first time preparation of molecularly intimate composites of zeolites with other components like nanoparticles, other layers, etc. This ability is not possible with the conventional 3D and even solid 2D zeolite forms. It allows synthesizing composites with desired combination of functionalities and additional benefits like open accessible architectures. The present article illustrates this novel approach by reporting the preparation of catalysts comprising 2.5 nm thick monolayers of the zeolite MWW and TiO2 nanoparticles with approximate diameter 4-8 nm. The chosen ratio is 1:1 w/w but it is readily adjustable to different values if desired. Two solutions of exfoliated zeolite MWW monolayers were used: as-made and after purification by dialysis. The composites precipitated upon mixing with TiO2 nanoparticle solutions. TEM investigation confirmed random mixing of the components producing house-ofcards structures. The composites were additionally characterized by X-ray powder diffraction, nitrogen sorption and FTIR. The efficacy of the new approach was demonstrated through testing in two catalytic oxidation reactions, and both showed advantage over the equivalent physical mixture of the components. One of the test reactions, diphenyl sulfide oxidation by H2O2 revealed both catalytic (in the dark) and photocatalytic (with irradiation) activity. The hydroxylation of terephthalic acid occurred by radical oxidation. The presented approach can be applied to design desired systems, e.g., with other semiconductors to allow more precise control not only of the content in mixed phases but also of optical and electronic properties of these materials.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Materials Today

ISSN

2352-9407

e-ISSN

2352-9415

Svazek periodika

41

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

102473

Kód UT WoS článku

001335261900001

EID výsledku v databázi Scopus

2-s2.0-85205949113