Significance of the surface and bulk features of hierarchical TiO2 in their photocatalytic properties

Kedves, Endre-Zsolt; Pap, Zsolt; Hernádi, Klára; Baia, Lucian

doi:10.1016/j.ceramint.2020.11.061

Cited by 6 publications

(4 citation statements)

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“…In the present work, the motivation was to assess the effect of α-MoO 3 upon the above-presented pristine photocatalysts and their activity. We demonstrated before that α-MoO 3 reduces the photocatalytic activity of TiO 2 , although band gap narrowing or the electron–hole recombination suppression might occur [ 1 ]. Our current results confirm that not only TiO 2 activity but the activity of photocatalysts (ZnO, BiOI, AgBr, and Cu 2 O) can be hindered in the presence of α-MoO 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Due to excitation, charge separation occurs, resulting in active radicals in an aqueous medium, such as ·OH, ·O 2 − . Numerous semiconductors (TiO 2 [ 1 ], WO 3 [ 2 ], BiOI [ 3 ], AgBr [ 4 ], ZnO [ 5 ], Cu 2 O [ 6 ]) with various structural properties were recognized as individual photocatalysts (depending on the irradiation type: UV, visible, or NIR light) [ 7 ]. However, further efficiency improvement can be achieved by making heterostructures where the lifetime of the photogenerated charge carriers is extended.…”

Section: Introductionmentioning

confidence: 99%

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Photoinhibitive Properties of α-MoO3 on Its Composites with TiO2, ZnO, BiOI, AgBr, and Cu2O

Kedves,

Bárdos,

Ravasz

et al. 2023

Materials

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Orthorhombic molybdenum trioxide (α-MoO3) is well known as a photocatalyst, adsorbent, and inhibitor during methyl orange photocatalytic degradation via TiO2. Therefore, besides the latter, other active photocatalysts, such as AgBr, ZnO, BiOI, and Cu2O, were assessed via the degradation of methyl orange and phenol in the presence of α-MoO3 using UV-A- and visible-light irradiation. Even though α-MoO3 could be used as a visible-light-driven photocatalyst, our results demonstrated that its presence in the reaction medium strongly inhibits the photocatalytic activity of TiO2, BiOI, Cu2O, and ZnO, while only the activity AgBr is not affected. Therefore, α-MoO3 might be an effective and stable inhibitor for photocatalytic processes to evaluate the newly explored photocatalysts. Quenching the photocatalytic reactions can offer information about the reaction mechanism. Moreover, the absence of photocatalytic inhibition suggests that besides photocatalytic processes, parallel reactions take place.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoinhibitive Properties of α-MoO3 on Its Composites with TiO2, ZnO, BiOI, AgBr, and Cu2O

Kedves,

Bárdos,

Ravasz

et al. 2023

Materials

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“…Recently, BiOCl was investigated more intensively, because of its beneficial properties, such as, low cost, simple synthesis methods and adequate band gap energy, similar to that of TiO 2 (3.2 eV) [ 2 ]. Several methods are available in the scientific literature to achieve photocatalytic activity under visible light irradiation for TiO 2 and BiOCl, such as the induction of oxygen vacancies [ 3 ], noble metal deposition or shape-controlled synthesis [ 4 , 5 , 6 , 7 ]. BiOCl presents promising results in visible-light-driven photocatalysis [ 8 , 9 , 10 ] as well for degrading organic pollutants such as phenol [ 9 ], pharmaceuticals [ 11 ] or even dyes [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Crystallization of Bismuth Oxychlorides (BiOCl) Using Different Shape Control Reagents

et al. 2021

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Bismuth oxychloride photocatalysts were obtained using solvothermal synthesis and different additives (CTAB—cetyltrimethylammonium bromide, CTAC—cetyltrimethylammonium chloride, PVP–polyvinylpyrrolidone, SDS–sodium dodecylsulphate, U—urea and TU—thiourea). The effect of the previously mentioned compounds was analyzed applying structural (primary crystallite size, crystal phase composition, etc.), morphological (particle geometry), optical (band gap energy) parameters, surface related properties (surface atoms’ oxidation states), and the resulted photocatalytic activity. A strong dependency was found between the surface tension of the synthesis solutions and the overall morpho-structural parameters. The main finding was that the characteristics of the semiconductors can be tuned by modifying the surface tension of the synthesis mixture. It was observed after the photocatalytic degradation, that the white semiconductor turned to grey. Furthermore, we attempted to explain the gray color of BiOCl catalysts after the photocatalytic decompositions by Raman and XPS studies.

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“…Már bizonyított számos félvezetőnél, mint például a TiO2 [17,90], a ZnO [91], a Bi2WO6 [27], a BiVO4 [92] és fém nanorészecskék [21,[93][94][95] Mindeközben a hidrofób rész kontrollálja az adszorbeálódott hidrofil csoportok közti távolságot és ezzel a nanoméretű lapok vastagságát (5. ábra) is [96,97].…”

Section: Az Adalékanyagok Hatása a Szintézis Során A Félvezetők Tulaj...unclassified

Bizmut-oxohalogenidek előállítása, vizsgálata és alkalmazhatóságuk látható fényben aktív fotokatalizátorként

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One of the biggest social, economic, and scientific challenge of the present and the near future is to address environmental and global climate change issues. These concerns including the production of drinking water and the treatment of industrial wastewaters in a way that protects the environment and be harmless to human health. Various regulatory limits our disposal that seek to regulate pollutant emissions, unfortunately many countries persistently exceed their emission/pollution levels. In recent decades, in addition to traditional water treatment processes, alternative processes have been developed to eliminate organic pollutants such as textile dyes, pesticides and herbicides used in agriculture. One such group of solution could be the so-called “Advanced oxidation processes (AOP)”, which includes methods that degrade organic pollutants using various redox reactions into less toxic compounds, preferably water and carbon dioxide. Among AOP/s the heterogeneous photocatalysis prominently investigated, in which a semiconductor catalyst is able to decompose contaminants in water by excitation with light of a suitable wavelength. The best-known semiconductor photocatalyst is titanium-dioxide (TiO2), but scientific interest has long been directed to other semiconductors such as bismuth oxohalides (BiOX, X = Cl, Br, I), which are considered highly potential catalysts under UV and visible irradiation. After production, BiOX do not require further modifcations to be excitable by visible light (natural or artificial), which can greatly reduce operating costs

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Significance of the surface and bulk features of hierarchical TiO2 in their photocatalytic properties

Cited by 6 publications

References 61 publications

Photoinhibitive Properties of α-MoO3 on Its Composites with TiO2, ZnO, BiOI, AgBr, and Cu2O

Photoinhibitive Properties of α-MoO3 on Its Composites with TiO2, ZnO, BiOI, AgBr, and Cu2O

Hydrothermal Crystallization of Bismuth Oxychlorides (BiOCl) Using Different Shape Control Reagents

Bizmut-oxohalogenidek előállítása, vizsgálata és alkalmazhatóságuk látható fényben aktív fotokatalizátorként

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