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Open AccessArticle

Development of Porous Titania Structure with Improved Photocatalytic Activity: Response Surface Modeling and Multi-Objective Optimization

1
Laboratory of Materials Chemistry, Department of Chemistry, “Alexandru Ioan Cuza” University of Iasi, 11 Carol I Boulevard, 700506 Iasi, Romania
2
Laboratory of Inorganic Polymers, “Petru Poni” Institute of Macromolecular Chemistry, 41 A Grigore Ghica Vodă Aley, 700487 Iasi, Romania
3
Science Research Department, Institute for Interdisciplinary Research, “Alexandru Ioan Cuza” University of Iasi, Lascar Catargi Str. 54, 700107 Iasi, Romania
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(5), 998; https://doi.org/10.3390/nano10050998
Received: 29 April 2020 / Revised: 18 May 2020 / Accepted: 21 May 2020 / Published: 23 May 2020
Porous titania was successfully synthesized by an ultrasound-assisted sol-gel route. The synthesis process was empirically modeled and optimized using the response surface methodology (RSM). Input variables adopted for optimization dealt with the weight ratio of precursors (r) and the sonication time (t), representing the used factors in the synthesis procedure. With regard to application, the synthesized TiO2 samples were tested for the photodegradation of two water-soluble organic pollutants under UV–Vis irradiation. Optimal conditions for the efficient pollutants’ photodegradation were found to involve a precursors ratio of 3 and a sonication time of 60 min. Thus, the M5 sample prepared under the founded optimal conditions yielded the maximal removal efficiencies of 98.4% and 46.3% for the photodegradation of CR dye and 2,4-D herbicide, respectively. In addition, the photodegradation kinetics revealed the pseudo first-order rate constants, showing the photodegradation of CR (k1 = 8.86 × 10−2 min−1) by M5 sample is about 1.3-fold faster than the photodegradation of 2,4-D pesticide (k2 = 6.84 × 10−2 min−1). View Full-Text
Keywords: porous titania; response surface methodology; optimization; photocatalytic activity porous titania; response surface methodology; optimization; photocatalytic activity
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MDPI and ACS Style

Mahu, E.; Ignat, M.; Cojocaru, C.; Samoila, P.; Coromelci, C.; Asaftei, I.; Harabagiu, V. Development of Porous Titania Structure with Improved Photocatalytic Activity: Response Surface Modeling and Multi-Objective Optimization. Nanomaterials 2020, 10, 998.

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