Tuning the photocatalytic performance of mesoporous silica-titanium dioxide and cobalt titanate for methylene blue and Congo red adsorption/ photodegradation: Impact of azo dyes concentration, catalyst mass, wavelength, reusability and kinetic properties

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F24%3AA2502NWU" target="_blank" >RIV/61988987:17310/24:A2502NWU - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S1010603024000662" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1010603024000662</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jphotochem.2024.115522" target="_blank" >10.1016/j.jphotochem.2024.115522</a>

Result language

angličtina

Original language name

Tuning the photocatalytic performance of mesoporous silica-titanium dioxide and cobalt titanate for methylene blue and Congo red adsorption/ photodegradation: Impact of azo dyes concentration, catalyst mass, wavelength, reusability and kinetic properties

Original language description

The present investigation explored the utilization of ordered mesoporous silica SBA-15 as a supporting matrix for photoactive materials, specifically TiO2 as anatase and mixed oxide TiO2/CoTiO3 forms. The resultant photoactive composites, denoted as SBA-15_1, SBA-15_2, and SBA-15_3, were synthesized with varying proportions of TiO2 and CoTiO3 and subjected to comprehensive physicochemical characterization. The findings unequivocally established the successful preparation of photocatalytic composites, accompanied by a discernible reduction in textural properties as the TiO2/CoTiO3 content increased. Notably, the presence of Ti(III) cations as Ti2O3 and Co(II) as dopant in the form of CoTiO3 was identified through X-ray photoelectron (XPS) and energy-dispersive X-ray (EDX) spectroscopy, contributing to an enhanced photocatalytic activity relative to commercial Aeroxide® P-25 titanium dioxide. The analysis of kinetic properties confirmed the effective and fast photodegradation of azo dyes (methylene blue (MB) and Congo red (CR)). SBA-15_1 exhibited a 30 % higher efficiency in the photodegradation of methylene blue than P-25. Furthermore, the initial concentration of the azo dye significantly affected the photodegradation process. SBA-15_1 degraded 1.1 mg g−1 at an initial concentration of 10 mg L−1 and 27.6 mg g−1 at 50 mg L−1 of methylene blue, corresponding to 11 % and 55.2 % degradation, respectively. Congo red displays similar trends with values of 1.2 mg g−1 at 10 mg L−1 and 10.9 mg g−1 at 50 mg L−1, representing degradation of 12.2 % and 21.8 % after 30 min. The degradation of the azo dye mixture proved a competitive reaction characterized by a high degree of adsorption and subsequent degradation of CR, followed by MB. The synergistic effect was manifested by an increased amount of azo dyes removed by the adsorption/photodegradation mechanism, 27.8 mg g−1 for MB and 25.5 mg g−1 for CR in 1: 1 (w: w, 25 mg: 25 mg) mixture at 254 nm after 30 min.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

J PHOTOCH PHOTOBIO A

ISSN

1010-6030

e-ISSN

1873-2666

Volume of the periodical

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Issue of the periodical within the volume

115522

Country of publishing house

CH - SWITZERLAND

Number of pages

17

Pages from-to

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UT code for WoS article

001179618100001

EID of the result in the Scopus database

2-s2.0-85184517090