Pyrolysis mechanism of aliphatic amines bound to titania nanoparticles after H2O2 oxidation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F22%3A00564422" target="_blank" >RIV/61388980:_____/22:00564422 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61988987:17310/22:A2302I4R

Výsledek na webu

<a href="https://doi.org/10.1016/j.jaap.2022.105761" target="_blank" >https://doi.org/10.1016/j.jaap.2022.105761</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jaap.2022.105761" target="_blank" >10.1016/j.jaap.2022.105761</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Pyrolysis mechanism of aliphatic amines bound to titania nanoparticles after H2O2 oxidation

Popis výsledku v původním jazyce

Organic compounds bound to peroxotitanates can influence the photocatalytic activity of TiO2 nanoparticles (NPs) obtained by subsequent annealing. Knowledge of how this influence plays out is fundamental for the development of NPs with desirable catalytic behavior, which can be used for several applications. Thermoanalytical techniques can be used to simulate the annealing process on a small scale, but there is a lack of literature on this topic. This is especially true for nitrogen-containing organic compounds, which are not often used as organic modifiers in NP synthesis. Here, we present a multianalytical study of the pyrolytic behavior of the organic fraction of amine-functionalized titania NPs after peroxide treatment (namely peroxotitanate nanoparticles modified with aliphatic amines). The study was carried out by TGA-MS, evolved gas analysis-mass spectrometry (EGA-MS) and double-shot analytical pyrolysis-GC-MS. The most abundant peaks in the GC-MS profiles obtained after thermal desorption were ascribed to nitriles, unsaturated hydrocarbons, and oxygenated compounds, whose total relative areas accounted for almost 100% for DPA and up to 70% for the other amines. This indicated that the presence of an N-Ti bond modulated the oxidating effect of hydrogen peroxide. Pyrolysis of the residual organic fraction on oxidized NPs underwent coupling reactions that led to the formation of aromatic species and, most interestingly, heteroaromatic compounds.

Název v anglickém jazyce

Pyrolysis mechanism of aliphatic amines bound to titania nanoparticles after H2O2 oxidation

Popis výsledku anglicky

Organic compounds bound to peroxotitanates can influence the photocatalytic activity of TiO2 nanoparticles (NPs) obtained by subsequent annealing. Knowledge of how this influence plays out is fundamental for the development of NPs with desirable catalytic behavior, which can be used for several applications. Thermoanalytical techniques can be used to simulate the annealing process on a small scale, but there is a lack of literature on this topic. This is especially true for nitrogen-containing organic compounds, which are not often used as organic modifiers in NP synthesis. Here, we present a multianalytical study of the pyrolytic behavior of the organic fraction of amine-functionalized titania NPs after peroxide treatment (namely peroxotitanate nanoparticles modified with aliphatic amines). The study was carried out by TGA-MS, evolved gas analysis-mass spectrometry (EGA-MS) and double-shot analytical pyrolysis-GC-MS. The most abundant peaks in the GC-MS profiles obtained after thermal desorption were ascribed to nitriles, unsaturated hydrocarbons, and oxygenated compounds, whose total relative areas accounted for almost 100% for DPA and up to 70% for the other amines. This indicated that the presence of an N-Ti bond modulated the oxidating effect of hydrogen peroxide. Pyrolysis of the residual organic fraction on oxidized NPs underwent coupling reactions that led to the formation of aromatic species and, most interestingly, heteroaromatic compounds.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/LM2018124" target="_blank" >LM2018124: Nanomateriály a nanotechnologie pro ochranu životního prostředí a udržitelnou budoucnost</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Analytical and Applied Pyrolysis

ISSN

0165-2370

e-ISSN

1873-250X

Svazek periodika

168

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

105761

Kód UT WoS článku

000889942600008

EID výsledku v databázi Scopus

2-s2.0-85141392384