Piotr Rychtowski

West Pomeranian University of Technology

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Beata Tryba

West Pomeranian University of Technology

Piotr Miądlicki

West Pomeranian University of Technology

Rafał J. Wróbel

West Pomeranian University of Technology

Bartłomiej Prowans

West Pomeranian University of Technology

Agata Markowska‐Szczupak

West Pomeranian University of Technology

Maciej Trzeciak

West Pomeranian University of Technology

M.C. Román-Martı́nez

University of Alicante

Paula Felczak

West Pomeranian University of Technology

M.A. Lillo-Ródenas

University of Alicante

Jacek Przepiórski

West Pomeranian University of Technology

Cooperative Institutions

West Pomeranian University of Technology

University of Szczecin

Zachodniopomorskie Centrum Onkologii

Oita University

Poznań University of Technology

Institute of Chemical Technology

University of Alicante

Consejo Superior de Investigaciones Científicas

Osaka University

Institute of Precision Mechanics

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The performance of multicomponent oxide systems based on TiO2, ZrO2 and SiO2 in the photocatalytic degradation of Rhodamine B: Mechanism and kinetic studies

Colloids and Surfaces A Physicochemical and Engineering Aspects (2019)

Katarzyna Siwińska‐Stefańska Dariusz Świgoń Piotr Rychtowski Dariusz Moszyński Agnieszka Zgoła‐Grześkowiak

Rhodamine B

10.1016/j.colsurfa.2019.124272

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Citations (57)

High performance fluidized bed photoreactor for ethylene decomposition

Polish Journal of Chemical Technology (2022)

Piotr Rychtowski Piotr Miądlicki Bartłomiej Prowans Beata Tryba

Abstract Removal of C 2 H 4 in the air was carried out in the continuous flow reactor with the photocatalytic bed (expanded polystyrene spheres coated by TiO 2 or SiO 2 /TiO 2 ) under irradiation of UV light. Continuous flow of a gas stream through the reactor was realised at the static bed and under bed fluidization. The required flow of a gas stream through the reactor for bed fluidisation was 500–700 ml/min, whereas for the static bed the flow rate of 20 ml/min was used. Fluidized bed reactor appeared to be much more efficient in ethylene removal than that with the stationary bed. It was caused by the increased speed of C 2 H 4 mass transfer to the photocatalyst surface and better utilization of the incident UV light. In the fluidized bed reactor calculated rate of C 2 H 4 degradation was around 10 μg/min whereas in the stationary state 1.2 μg/min only.

Fluidization

Polystyrene

10.2478/pjct-2022-0014

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The inflence of TiO2 structure on the complete decomposition of acetaldehyde gas

Materials Research Bulletin (2020)

Beata Tryba Piotr Rychtowski Joanna Sreńscek-Nazzal Jacek Przepiórski

Crystallisation of amorphous TiO2 have been performed by two steps, the hydrothermal method and following heating in Ar at 450 °C or mild heating at 200 °C under vacuum. Both methods were successful in reducing the amount of OH groups on TiO2 surface, however heating at high temperature caused significant decrease of BET surface area and increase in mesoporosity of TiO2. Low hydroxylated surface of TiO2 caused, that acetaldehyde was adsorbed on its surface with chemical bounding and then could be decomposed via photocatalytic process. Although amount of acetaldehyde decomposed on TiO2 was comparable for both thermal heated samples, that than prepared at 200 °C under vacuum showed higher mineralisation degree and lower emission of formaldehyde from its surface. It appeared, that large pores present in sample heat treated at 450 °C favored diffusion of the formed byproducts from its surface and consequently lower mineralisation degree was obtained.

BET theory

Specific surface area

Degree (music)

10.1016/j.materresbull.2020.110816

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Citations (19)

Photocatalytic Decomposition of Acetaldehyde on Different TiO2-Based Materials: A Review

Catalysts (2020)

Beata Tryba Piotr Rychtowski Agata Markowska‐Szczupak Jacek Przepiórski

Purification of air from the organic contaminants by the photocatalytic process has been confirmed to be very perspective. Although many various photocatalysts have been prepared and studied so far, TiO2 is still the most commonly used, because of its advantageous properties such as non-toxicity, relatively low cost and high stability. Surface modifications of TiO2 were extensively proceeded in order to increase photocatalytic activity of the photocatalyst under both UV and visible light activations. The intention of this review paper was to summarize the scientific achievements devoted to developing of TiO2-based materials considered as photocatalysts for the photocatalytic degradation of acetaldehyde in air. Influence of the preparation and modification methods on the parameters of the resultant photocatalyst is reviewed and discussed in this work. Affinity of the photocatalyst surfaces towards adsorption of acetaldehyde will be described by taking into account its physicochemical parameters. Impact of the contact time of a pollutant with the photocatalyst surface is analyzed and discussed with respect to both the degradation rate and mineralization degree of the contaminant. Influence of the photocatalyst properties on the mechanism and yield of the photocatalytic reactions is discussed. New data related to the acetaldehyde decomposition on commercial TiO2 were added, which indicated the different mechanisms occurring on the anatase and rutile structures. Finally, possible applications of the materials revealing photocatalytic activity are presented with a special attention paid to the photocatalytic purification of air from Volatile Organic Compounds (VOCs).

Rutile

10.3390/catal10121464

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Impact of TiO2 Reduction and Cu Doping on Bacteria Inactivation under Artificial Solar Light Irradiation

Molecules (2022)

Piotr Rychtowski Oliwia Paszkiewicz M.C. Román-Martı́nez M.A. Lillo-Ródenas Agata Markowska‐Szczupak

Preparation of TiO2 using the hydrothermal treatment in NH4OH solution and subsequent thermal heating at 500-700 °C in Ar was performed in order to introduce some titania surface defects. The highest amount of oxygen vacancies and Ti3+ surface defects were observed for a sample heat-treated at 500 °C. The presence of these surface defects enhanced photocatalytic properties of titania towards the deactivation of two bacteria species, E. coli and S. epidermidis, under artificial solar lamp irradiation. Further modification of TiO2 was targeted towards the doping of Cu species. Cu doping was realized through the impregnation of the titania surface by Cu species supplied from various copper salts in an aqueous solution and the subsequent heating at 500 °C in Ar. The following precursors were used as a source of Cu: CuSO4, CuNO3 or Cu(CH3COO)2. Cu doping was performed for raw TiO2 after a hydrothermal process with and without NH4OH addition. The obtained results indicate that Cu species were deposited on the titania surface defects in the case of reduced TiO2, but on the TiO2 without NH4OH modification, Cu species were attached through the titania adsorbed hydroxyl groups. Cu doping on TiO2 increased the absorption of light in the visible range. Rapid inactivation of E. coli within 30 min was obtained for the ammonia-reduced TiO2 heated at 500 °C and TiO2 doped with Cu from CuSO4 solution. Photocatalytic deactivation of S. epidermidis was greatly enhanced through Cu doping on TiO2. Impregnation of TiO2 with CuSO4 was the most effective for inactivation of both E. coli and S. epidermidis.

Surface Modification

10.3390/molecules27249032

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Citations (2)

Sulphated TiO2 Reduced by Ammonia and Hydrogen as an Excellent Photocatalyst for Bacteria Inactivation

Materials (2023)

Piotr Rychtowski Oliwia Paszkiewicz Agata Markowska‐Szczupak Grzegorz Leniec Beata Tryba

This study presents a relatively low-cost method for modifying TiO2-based materials for photocatalytic bacterial inactivation. The photocatalytic inactivation of Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus epidermidis) bacteria using modified sulphated TiO2 was studied. The modification focused on the reduction of TiO2 by ammonia agents and hydrogen at 400–450 °C. The results showed a high impact of sulphate species on the inactivation of E. coli. The presence of these species generated acid sites on TiO2, which shifted the pH of the reacted titania slurry solution to lower values, around 4.6. At such a low pH, TiO2 was positively charged. The ammonia solution caused the removal of sulphate species from TiO2. On the other hand, hydrogen and ammonia molecules accelerated the removal of sulphur species from TiO2, as did heating it to 450 °C. Total inactivation of E. coli was obtained within 30 min of simulated solar light irradiation on TiO2 heat-treated at 400 °C in an atmosphere of Ar or NH3. The S. epidermidis strain was more resistant to photocatalytic oxidation. The contact of these bacteria with the active titania surface is important, but a higher oxidation force is necessary to destroy their cell membrane walls because of their thicker cell wall than E. coli. Therefore, the ability of a photocatalyst to produce ROS (reactive oxidative species) will determine its ability to inactivate S. epidermidis. An additional advantage of the studies presented is the inactivation of bacteria after a relatively short irradiation time (30 min), which does not often happen with photocatalysts not modified with noble metals. The modification methods presented represent a robust and inexpensive alternative to photocatalytic inactivation of bacteria.

10.3390/ma17010066

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Coating of expanded polystyrene spheres by TiO2 and SiO2–TiO2 thin films

Journal of materials research/Pratt's guide to venture capital sources (2024)

Piotr Miądlicki Piotr Rychtowski Beata Tryba

Abstract Expanded polystyrene spheres (EPS) were coated by SiO 2 –TiO 2 or TiO 2 for application as a fluidized bed in the photocatalytic reactor. Silica coating was realized by the sol–gel process carried out in a vacuum evaporator at 60–70 °C. The most uniform and thin layer of silica coating was obtained by the Stöber method based on the hydrolysis of tetraethyl orthosilicate (TEOS) catalysed by an ammonia solution. Effective TiO 2 coating was obtained by the immersion of EPS in the titania aqueous suspension and evaporation of water in a vacuum evaporator. Heating of EPS spheres coated by SiO 2 , TiO 2 or SiO 2 –TiO 2 at the temperatures of 120–140 °C resulted in a shrinkage of their volume. For the thick layer coating, a strong corrugation of EPS surface was observed. The photocatalytic tests showed, that highly corrugated surface of coated EPS slowed down ethylene decomposition, whereas a thin layer coating of both, SiO 2 and TiO 2 was advantageous. Graphical abstract

Polystyrene

Dip-coating

10.1557/s43578-024-01319-3

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Role of the Hydroxyl Groups Coordinated toTiO2 Surface on the Photocatalytic Decomposition of Ethylene at Different Ambient Conditions

Catalysts (2022)

Piotr Rychtowski Beata Tryba Agnieszka Skrzypska Paula Felczak Joanna Sreńscek-Nazzal

The titania pulp—a semi product received from the industrial production of titania white—was submitted for the thermal heating at 400–600 °C under Ar and H2 to obtain TiO2 with different structure and oxygen surface defects. Heating of titania in H2 atmosphere accelerated dehydration and crystallisation of TiO2 compared to heating in Ar. TiO2 prepared at 500 and 600 °C under H2 had some oxygen vacancies and Ti3+ centres (electron traps), whereas TiO2 obtained at 450 °C under H2 exhibited some hole traps centres. The presence of oxygen vacancies induced adsorption of atmospheric CO2. It was evidenced, that ethylene reacted with TiO2 after UV irradiation. Formic acid was identified on TiO2 surface as the reaction product of ethylene oxidation. Hydroxyl radicals were involved in complete mineralisation of ethylene. TiO2 prepared at 500 °C under H2 was poorly active because some active sites for coordination of ethylene molecules were occupied by CO2. The most active samples were TiO2 with high quantity of OH terminal groups. At 50 °C, the physically adsorbed water molecules on titania surface were desorbed, and then photocatalytic decomposition of ethylene was more efficient. TiO2 with high quantity of chemisorbed OH groups was very active for ethylene decomposition. The acidic surface of TiO2 enhances its hydroxylation. Therefore, it is stated that TiO2 having acidic active sites can be an excellent photocatalyst for ethylene decomposition under UV light.

10.3390/catal12040386

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Superiority of TiO<sub>2</sub> Supported on the Nickel Foam Over Ni Doped TiO<sub>2</sub> in the Photothermal Decomposition of Acetaldehyde

Beata Tryba Piotr Miądlicki Piotr Rychtowski Maciej Trzeciak Rafał J. Wróbel

Acetaldehyde decomposition was performed under heating at the temperature range of 25-125oC and UV irradiation on TiO2 doped by the metallic Ni powder and TiO2 supported on the nickel foam. Process was carried out in high temperature reaction chamber “The Praying MantisTM”, with simultaneous in situ FTIR measurements and UV irradiation. Ni powder was added to TiO2 in the quantity of 0.5 to 5.0 wt%. Photothermal measurements of acetaldehyde decomposition indicated, that the highest yield of acetaldehyde conversion on TiO2 und UV irradiation was obtained at 75oC. Doping of nickel to TiO2 did not increase its photocatalytic activity. Contrary to that, application of nickel foam as a support for TiO2 appeared to be highly advantageous, because increased decomposition of acetaldehyde from 31 to 52% at 25oC and then to 85% at 100oC by comparison with TiO2 itself. At the same time mineralisation of acetaldehyde to CO2 increased two times at the presence of nickel foam. However, oxidised nickel foam used as support for TiO2 was detrimental. Most likely, different mechanisms of electrons transfer between Ni-TiO2 and NiO-TiO2 occurred. Application of nickel foam greatly enhanced separation of free carriers in TiO2. As a consequence, high yields of the photocatalytic reactions were obtained.

Non-blocking I/O

10.20944/preprints202306.1825.v1

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Citations (4)

Enhanced Ethylene Removal in a Fluidized Bed Photoreactor with Polystyrene as a Novel Bed

Industrial & Engineering Chemistry Research (2024)

Piotr Rychtowski Bartłomiej Prowans Piotr Miądlicki Paula Felczak Beata Tryba

A fluidized bed reactor was used for the photocatalytic removal of ethylene to enhance the efficacy of ethylene decomposition through better contact of ethylene molecules with the photocatalyst, which was immobilized on the bed. Expanded polystyrene spheres were used as a bed because they have low densities, which allow one to apply relatively low velocity of flowing gas through the fluidized bed reactor. An expanded polystyrene sphere bed coated with TiO2 and SiO2/TiO2 was used the first time in the photocatalytic decomposition of ethylene. Photoreactor parameters and process conditions were evaluated for this new photocatalytic bed. The advantage of the UV-LED system used for the photocatalytic process was demonstrated. The morphology of the photocatalytic bed spheres was investigated by SEM/EDS images, and the coverage degrees of TiO2 and SiO2 were determined by TG analyses. The highest ethylene decomposition rate was obtained using the PS-SiO2–TiO2 composite (44.5 μg/min at a flow rate of 240 mL/min and an ethylene feed of 200 ppm in air). The use of a SiO2 semilayer allowed to obtain a more homogeneous TiO2 distribution on the bed. With the UV-LED system, ethylene degradation was 15 times higher than with fluorescent UV lamps, where the energy consumption was comparable.

Polystyrene

10.1021/acs.iecr.3c03609

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Citations (1)