The use of heterogeneous photocatalysis for treatment of wastewaters containing azo dyes – effects of pH and salinity on TiO2 zeta potential and photocatalytic activity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39913236" target="_blank" >RIV/00216275:25310/18:39913236 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The use of heterogeneous photocatalysis for treatment of wastewaters containing azo dyes – effects of pH and salinity on TiO2 zeta potential and photocatalytic activity

Popis výsledku v původním jazyce

The knowledge of interrelations between catalyst zeta potential, dye adsorption, and photocatalytic performance is important for evaluating the process parameters of photocatalytic wastewater treatment. This paper deals with the experimental study of heterogeneous UV photocatalysis, used for removal of methyl orange dye from model wastewater. Photocatalytic experiments were conducted in an open batch reactor with P25 aeroxide TiO2 as a photocatalyst and UV-A LED array as the light source. During experiments, the effect of pH and co-existing ions on the catalyst zeta potential and both the dye adsorption and degradation efficiency was studied. The adsorption of the dye onto the surface of the P25 catalyst was a very important step in the photocatalytic reaction and was strongly dependent on pH and salinity of the reaction solution. Photocatalytic decolorization was found out to be faster in acidic pH without any added sodium chloride. In contrary, the addition of sodium chloride significantly increased the decolorization efficiency in the alkaline pH. It also results from the comparison of the experimental data obtained, that the zeta potential is not a universal indicator of the degree of dye sorption as well as photocatalytic degradation on titanium dioxide.

Název v anglickém jazyce

The use of heterogeneous photocatalysis for treatment of wastewaters containing azo dyes – effects of pH and salinity on TiO2 zeta potential and photocatalytic activity

Popis výsledku anglicky

The knowledge of interrelations between catalyst zeta potential, dye adsorption, and photocatalytic performance is important for evaluating the process parameters of photocatalytic wastewater treatment. This paper deals with the experimental study of heterogeneous UV photocatalysis, used for removal of methyl orange dye from model wastewater. Photocatalytic experiments were conducted in an open batch reactor with P25 aeroxide TiO2 as a photocatalyst and UV-A LED array as the light source. During experiments, the effect of pH and co-existing ions on the catalyst zeta potential and both the dye adsorption and degradation efficiency was studied. The adsorption of the dye onto the surface of the P25 catalyst was a very important step in the photocatalytic reaction and was strongly dependent on pH and salinity of the reaction solution. Photocatalytic decolorization was found out to be faster in acidic pH without any added sodium chloride. In contrary, the addition of sodium chloride significantly increased the decolorization efficiency in the alkaline pH. It also results from the comparison of the experimental data obtained, that the zeta potential is not a universal indicator of the degree of dye sorption as well as photocatalytic degradation on titanium dioxide.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Waste Forum

ISSN

1804-0195

e-ISSN

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Svazek periodika

2018

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

14

Strana od-do

430-443

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85059976856