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

Result code in 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>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

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

Name of the periodical

Waste Forum

ISSN

1804-0195

e-ISSN

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Volume of the periodical

2018

Issue of the periodical within the volume

4

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

14

Pages from-to

430-443

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85059976856