Synthesis of Composite Photocatalytic Nanoparticles ZnO.mSiO2 Using New Aerosol Method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F16%3A86099911" target="_blank" >RIV/61989100:27360/16:86099911 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27640/16:86099911

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Synthesis of Composite Photocatalytic Nanoparticles ZnO.mSiO2 Using New Aerosol Method

Popis výsledku v původním jazyce

In this work we describe new aerosol method of synthesis of photocatalytic powder of composite nanoparticles ZnO.mSiO2. The zinc acetate solution (Zn(Ac)2) in specific concentration was sonicated into aerosol microdroplets with an average size of 3.5 μm in the Omron NE-U17 nebulizer. These were subsequently transported by flowing air into the intensively stirred solution of sodium waterglass with modulus 3. After impact of these aerosol "microreactors Zn(Ac)2" the two liquid sollutions of reactants produced composite nanoparticles ZnO.mSiO2. As the amount of Zn(Ac)2 in a microdroplet is limited, so is the extent of the precipitation reaction and the nanoparticle diameter can be regulated by reactant concentration in the liquid dispersion. The final nanopowder with particles diameter of approx. 8 nm shows higher photocatalytic activity than TiO2 Evonik P25 standard and repeated tests also demonstrate good photo corrosion resistance. The results confirmed good efficiency of aerosol synthesis, especially when preparing nanoparticles of few nanometers in size. However, disproportion between the predicted size of nanoparticles around 20 nm and the real value of approx. 8 nm remains the objective of further research. To obtain more realistic size characteristics of the final nanoparticles, the balance calculation method, which overestimated the size of the nanoparticles over ten times, must be improved. According to our current experience, there are several ways, which could bring the solution to this problem, among which better incorporation of the reaction kinetics and the equilibrium parameters into the calculation seems the most promising. It is very likely that at the moment of a droplet impact, when the two solutions get in contact, multiple nucleation of future nanoparticles starts at the interface.

Název v anglickém jazyce

Synthesis of Composite Photocatalytic Nanoparticles ZnO.mSiO2 Using New Aerosol Method

Popis výsledku anglicky

In this work we describe new aerosol method of synthesis of photocatalytic powder of composite nanoparticles ZnO.mSiO2. The zinc acetate solution (Zn(Ac)2) in specific concentration was sonicated into aerosol microdroplets with an average size of 3.5 μm in the Omron NE-U17 nebulizer. These were subsequently transported by flowing air into the intensively stirred solution of sodium waterglass with modulus 3. After impact of these aerosol "microreactors Zn(Ac)2" the two liquid sollutions of reactants produced composite nanoparticles ZnO.mSiO2. As the amount of Zn(Ac)2 in a microdroplet is limited, so is the extent of the precipitation reaction and the nanoparticle diameter can be regulated by reactant concentration in the liquid dispersion. The final nanopowder with particles diameter of approx. 8 nm shows higher photocatalytic activity than TiO2 Evonik P25 standard and repeated tests also demonstrate good photo corrosion resistance. The results confirmed good efficiency of aerosol synthesis, especially when preparing nanoparticles of few nanometers in size. However, disproportion between the predicted size of nanoparticles around 20 nm and the real value of approx. 8 nm remains the objective of further research. To obtain more realistic size characteristics of the final nanoparticles, the balance calculation method, which overestimated the size of the nanoparticles over ten times, must be improved. According to our current experience, there are several ways, which could bring the solution to this problem, among which better incorporation of the reaction kinetics and the equilibrium parameters into the calculation seems the most promising. It is very likely that at the moment of a droplet impact, when the two solutions get in contact, multiple nucleation of future nanoparticles starts at the interface.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JI - Kompositní materiály

OECD FORD obor

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Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Hutnické listy

ISSN

0018-8069

e-ISSN

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Svazek periodika

6

Číslo periodika v rámci svazku

69

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

5

Strana od-do

68-72

Kód UT WoS článku

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EID výsledku v databázi Scopus

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