Systematic evaluation of thermal and mechanical stability of different commercial and synthetic photocatalysts in relation to their photocatalytic activity

Ribbens, Stefan; Beyers, E.; Schellens, Kevin; Mertens, Myrjam; Ke, Xiaoxing; Bals, Sara; Tendeloo, G. Van; Meynen, Vera; Cool, Pegie

doi:10.1016/j.micromeso.2012.01.036

Cited by 9 publications

(9 citation statements)

References 50 publications

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“…The obtained pore size (5.6 nm) is suitable for hhMb incorporation. Furthermore, as shown elsewhere, 45 the thermal process increases the crystallinity of the Millennium PC500. From now on we will refer only to the mesoporous Millennium PC500 as the material calcined at 350 1C with a pore size of 5.6 nm (Mil).…”

Section: Characterization Of Calcined Millenniumsupporting

confidence: 59%

“…Millennium PC500 was calcined as received at 350 1C for 6 h (1 1C min À1 ) in a Lenton chamber furnace in order to obtain an enlarged pore size. 45 The surface area and the pore size of the calcined and of the myoglobin-incorporated materials were measured via N 2 -sorption. All buffers used in this work are aqueous solutions of the three buffers discussed above.…”

Section: Methodsmentioning

confidence: 99%

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The effect of the buffer solution on the adsorption and stability of horse heart myoglobin on commercial mesoporous titanium dioxide: a matter of the right choice

Loreto

Cuypers

Brokken

et al. 2017

Phys. Chem. Chem. Phys.

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Despite the numerous studies on the adsorption of different proteins onto mesoporous titanium dioxide and indications on the important role of buffer solutions in bioactivity, a systematic study on the impact of the buffer on the protein incorporation into porous substrates is still lacking. We here studied the interaction between a commercial mesoporous TiO and three of the most used buffers for protein incorporation, i.e. HEPES, Tris and phosphate buffer. In addition, this paper analyzes the adsorption of horse heart myoglobin (hhMb) onto commercial mesoporous TiO as a model system to test the influence of buffers on the protein incorporation behavior in mesoporous TiO. N sorption analysis, FT-IR and TGA/DTG measurements were used to evaluate the interaction between the buffers and the TiO surface, and the effect of such an interaction on hhMb adsorption. Cyclic voltammetry (CV) and electron paramagnetic resonance (EPR) were used to detect changes in the microenvironment surrounding the heme. The three buffers show a completely different interaction with the TiO surface, which drastically affects the adsorption of myoglobin as well as its structure and electrochemical activity. Therefore, special attention is required while choosing the buffer medium to avoid misguided evaluation of protein adsorption on mesoporous TiO.

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Section: Characterization Of Calcined Millenniumsupporting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

The effect of the buffer solution on the adsorption and stability of horse heart myoglobin on commercial mesoporous titanium dioxide: a matter of the right choice

Loreto

Cuypers

Brokken

et al. 2017

Phys. Chem. Chem. Phys.

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“…Hydrogen peroxide (H 2 O 2 ), nafion 117 (5% in a mixture of lower aliphatic alcohols and water), potassium chloride (KCl), 4-aminophenol (4-AP), and potassium phosphate monobasic (KH 2 PO 4 ) were purchased from Sigma-Aldrich. Hydroquinone (HQ) was obtained from Acros, TiO 2 (Millennium PC500, mesoporous anatase) from Crystal Global (prior to use, the TiO 2 was calcined to 450 °C to enlarge its pore size) . Horseradish peroxidase (HRP) (EC 1.11.1.7) with the activity of 293.0 U/mg was purchased from Calbiochem.…”

Section: Methodsmentioning

confidence: 99%

Amperometric Flow-Injection Analysis of Phenols Induced by Reactive Oxygen Species Generated under Daylight Irradiation of Titania Impregnated with Horseradish Peroxidase

et al. 2020

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Titanium dioxide (TiO2) is a unique material for biosensing applications due to its capability of hosting enzymes. For the first time, we show that TiO2 can accumulate reactive oxygen species (ROS) under daylight irradiation and can support the catalytic cycle of horseradish peroxidase (HRP) without the need of H2O2 to be present in the solution. Phenolic compounds, such as hydroquinone (HQ) and 4-aminophenol (4-AP), were detected amperometrically in flow-injection analysis (FIA) mode via the use of an electrode modified with TiO2 impregnated with HRP. In contrast to the conventional detection scheme, no H2O2 was added to the analyte solution. Basically, the inherited ability of TiO2 to generate reactive oxygen species is used as a strategy to avoid adding H2O2 in the solution during the detection of phenolic compounds. Electron paramagnetic resonance (EPR) spectroscopy indicates the presence of ROS on titania which, in interaction with HRP, initiate the electrocatalysis toward phenolic compounds. The amperometric response to 4-AP was linear in the concentration range between 0.05 and 2 μM. The sensitivity was 0.51 A M–1 cm–2, and the limit of detection (LOD) 26 nM. The proposed sensor design opens new opportunities for the detection of phenolic traces by HRP-based electrochemical biosensors, yet in a more straightforward and sensitive way following green chemistry principles of avoiding the use of reactive and harmful chemical, such as H2O2.

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“…The mechanical stability of the titania powders prepared by EISA method were found to be superior to several commercial samples, however a NaOH post-treatment method was required. This, however, had a negative effect on the photocatalytic activity [ 154 ].…”

Section: Applicationsmentioning

confidence: 99%

Versatility of Evaporation-Induced Self-Assembly (EISA) Method for Preparation of Mesoporous TiO2 for Energy and Environmental Applications

2014

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Evaporation-Induced Self-Assembly (EISA) method for the preparation of mesoporous titanium dioxide materials is reviewed. The versatility of EISA method for the rapid and facile synthesis of TiO2 thin films and powders is highlighted. Non-ionic surfactants such as Pluronic P123, F127 and cationic surfactants such as cetyltrimethylammonium bromide have been extensively employed for the preparation of mesoporous TiO2. In particular, EISA method allows for fabrication of highly uniform, robust, crack-free films with controllable thickness. Eleven characterization techniques for elucidating the structure of the EISA prepared mesoporous TiO2 are discussed in this paper. These many characterization methods provide a holistic picture of the structure of mesoporous TiO2. Mesoporous titanium dioxide materials have been employed in several applications that include Dye Sensitized Solar Cells (DSSCs), photocatalytic degradation of organics and splitting of water, and batteries.

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Systematic evaluation of thermal and mechanical stability of different commercial and synthetic photocatalysts in relation to their photocatalytic activity

Cited by 9 publications

References 50 publications

The effect of the buffer solution on the adsorption and stability of horse heart myoglobin on commercial mesoporous titanium dioxide: a matter of the right choice

The effect of the buffer solution on the adsorption and stability of horse heart myoglobin on commercial mesoporous titanium dioxide: a matter of the right choice

Amperometric Flow-Injection Analysis of Phenols Induced by Reactive Oxygen Species Generated under Daylight Irradiation of Titania Impregnated with Horseradish Peroxidase

Versatility of Evaporation-Induced Self-Assembly (EISA) Method for Preparation of Mesoporous TiO2 for Energy and Environmental Applications

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