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1

Stability of selenium diet supplement

Grzechulska-Damszel J., Markowska-Szczupak A., Morawski A. W.

Polish Journal of Chemical Technology

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2018

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Vol. 20, nr 4

84--87

EN

Selenium is one of the trace elements playing a crucial role in a proper function of living organisms. Selenium intake varies, largely based on the selenium content of food. The daily Se intake recommended for adults amounts to 55 μg per day. The mean level of selenium in the population varies considerably between countries. Recent studies on the selenium dietary intakes in Poland showed that it is not sufficient to meet the daily requirement for this microelement so it is strongly recommended to employ selenium supplementation. The commercial product SEL-BRCA1® being a selenium diet supplement was subjected to chemical and microbial analysis to determine its stability in storage time and conditions. Basing on the obtained results it can be stated that the stability of studied supplement, stored in the closed bottles, can be confirmed for the period of time up to 45 months after the production date and it is not recommended to store opened bottles for the period of time longer than 12 months. The studied supplement showed a very high microbial stability what underscores its usefulness as human medicines.

2

Zastosowanie metod zaawansowanego utleniania jako drugiego etapu oczyszczania ścieków pralniczych

Kuźmiński K., Grzechulska-Damszel J., Zając K., Morawski A. W., Janus M.

Przemysł Chemiczny

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2016

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T. 95, nr 11

2210--2215

PL

Zbadano efektywność metod zaawansowanego utleniania (fotolizy, fotokatalizy oraz ozonowania) w procesie rozkładu anionowego związku powierzchniowo czynnego, jakim był dodecylobezenosulfonian sodu. Zbadano również wpływ procesów zaawansowanego utleniania na stopień oczyszczania rzeczywistych ścieków pralniczych oczyszczonych wstępnie metodami biologicznymi. Wykazano, że efektywność zastosowanych procesów jest większa w przypadku oczyszczania modelowego roztworu surfaktantu niż w przypadku oczyszczania rzeczywistych ścieków pralniczych. Odpowiednie łączenie metod zaawansowanego utleniania jest dobrym sposobem na osiągnięcie znacznego zmniejszenia stężenia związków organicznej w ściekach w stosunkowo krótkim czasie.

EN

Aq. soln. of Na dodecylbenzenesulfonate and biolog. pretreated laundry wastewater were purified by advanced oxidn. (photolysis, photocatalysis, ozonation) under UV irradn. with 2 types of light source (medium and high pressure UV lamps). The use of medium pressure UV lamp was more effective than the monochromatic low pressure one. The highest redn. level of total org. was 86% after 6 h of UV irradn.

3

Nadanie właściwości fotokatalitycznych gipsowym materiałom budowlanym ze szczególnym uwzględnieniem odpadowych gipsów z odsiarczania spalin

Zając K., Janus M., Kuźmiński K., Morawski A. W.

Przemysł Chemiczny

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2016

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T. 95, nr 11

2222--2226

PL

Przedstawiono możliwości otrzymania fotokatalitycznych gipsów z gipsu odpadowego otrzymanego z instalacji odsiarczania spalin. Wykazano że niewielki dodatek ditlenku tytanu do matrycy gipsowej umożliwia rozkład uciążliwych zanieczyszczeń znajdujących się w powietrzu kontaktującym się z powierzchniami gipsowymi. Zastosowanie odpadowego materiału gipsowego, pochodzącego z instalacji odsiarczania spalin, jako materiału bazowego, okazało się nie tylko rozwiązaniem ekologicznym, ale także prowadzącym do lepszych wyników niż gdy materiałem bazowym był gips otrzymany z kamienia gipsowego. Parametry wytrzymałościowe oraz żywotność nowych modyfikowanych gipsów wskazały na ich wysoki potencjał aplikacyjny.

EN

Gypsum-based building materials consisting of (i) waste gypsum recovered via flue-gas desulfurization or (ii) com. gypsum were modified by addn. of TiO2 photocatalyst. The (i) and (ii) samples with various TiO2 content (1–10% by mass) were studied for photocatalytic activity in NO degrdn. and mech. properties (compressive strength under dry and wet conditions). Firstly, the TiO2 presence in gypsum matrix resulted in NO photocatalytic degrdn. (40.4–67.9% and 34.1–63.5% for (i) and (ii), resp.), increasing with TiO2 loading. Secondly, the TiO2/gypsum mass ratio 2–3% did not influence significantly on compressive strength. Thirdly, using (i) provided better results in comparison to (ii), in both photocatalytic and mech. properties. The optimum mixt. was (i) with 3% by mass of TiO2 (58% NO degrdn.). It had higher compressive strength than the unmodified (ii) (9.44 vs. 8.83 and 3.02 vs. 2.92 under dry and wet conditions, resp.) and a longer lifecycle time.

4

Influence of titanium dioxide modification on the antibacterial properties

Rokicka P., Markowska-Szczupak A., Kowalczyk Ł., Kowalska E., Morawski A. W.

Polish Journal of Chemical Technology

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2016

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Vol. 18, nr 4

56--64

EN

Antibacterial properties of 15 titania photocatalysts, mono- and dual-modified with nitrogen and carbon were examined. Amorphous TiO2 , supplied by Azoty Group Chemical Factory Police S.A., was used as titania source (Ar-TiO2 , C-TiO2 , N-TiO2 ;2 and N,C-Ti2 2 calcined at 300°C, 400°C, 500°C, 600°C, 700°C). The disinfection ability was examined against Escherichia coli K12 under irradiation with UV and artificial sunlight and in dark conditions. It has been found the development of new photocatalysts with enhanced interaction ability with microorganisms might be a useful strategy to improve disinfection method conducted under artificial sunlight irradiation. The efficiency of disinfection process conducted under artificial sunlight irradiation with carbon (C-TiO2 ) and carbon/nitrogen (N,C-TiO2 ) photocatalysts was similar as obtained under UV irradiation. Furthermore, during dark incubation, any toxicity of the photocatalyst was noted.

5

Temperature study of magnetic resonance spectra of co-modified (Co,N)-TiO2 nanocomposites

Guskos N., Typek J., Zolnierkiewicz G., Guskos A., Berczynski P., Dolat D., Mozia S., Aidinis K., Kruk K., Morawski A. W.

Materials Science Poland

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2016

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Vol. 34, No. 2

242--250

EN

The (nCo,N)-TiO2 (n = 1, 5 and 10 wt.% of Co) nanocomposites were investigated by magnetic resonance spectroscopy in 4 K to 290 K range. Analyses of ferromagnetic/electron paramagnetic resonance (FMR/EPR) spectra in terms of four Callen lineshape components revealed the existence of two types of magnetic centers, one derived from metallic cobalt nanoparticles in superparamagnetic (SPM) phase and the other from cobalt clusters in the TiO2 lattice. Additionally, at low temperature the EPR spectrum arising from Ti3+ ions was also registered. Both relaxations of the Landau-Lifshitz type and the Bloch-Bloembergen type played an important role at high temperature in determining the linewidths and the latter relaxation was prevailing at low temperature. Analysis of the integrated intensity showed that the SPM signal is due to small size FM cobalt nanoparticles while the paramagnetic signal from Co clusters originates from those nanoparticles in which the concentration of magnetic polarons is below the percolation threshold.

6

Otrzymywanie 1,3-propanodiolu z glicerolu w bioreaktorze membranowym

Gryta M., Waszak M., Morawski A. W.

Przemysł Chemiczny

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2015

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T. 94, nr 4

628-632

PL

Przedstawiono wyniki badań otrzymywania 1,3-propanodiolu z glicerolu metodą fermentacji z użyciem bakterii Citrobacter freundii. Proces fermentacji prowadzono w bioreaktorze membranowym, w którym zastosowano trójstopniową separację. W pierwszym stopniu stosując mikrofiltrację, uzyskano klarowny filtrat, który następnie rozdzielono metodą nanofiltracji. Otrzymany roztwór 1,3-propanodiolu zatężono w procesie destylacji membranowej. Uzyskany w tym procesie destylat oraz retentat z procesu nanofiltracji zawrócono do bioreaktora, co pozwoliło zamknąć obieg wody oraz odzyskać składniki odżywcze niezbędne do procesu fermentacji.

EN

Glycerol was converted to 1,3-propanediol by fermentation with use of Citrobacter freundii bacteria in a membranę bioreactor with a 3-stage sepn. A clean microfiltrate was sepd. by nanofiltration. The aq. soln. of 1,3-propanediol was concd. by membrane distn. Both the distillate and the retentate from nanofiltration were recycled to the bioreactor to close the H₂O cycle and recover the nutrients.

7

Preliminary studies of photocatalytic activity of gypsum plasters containing TiO2 co-modified with nitrogen and carbon

Janus M., Bubacz K., Zatorska J., Kusiak-Nejman E., Czyżewski A., Morawski A. W.

Polish Journal of Chemical Technology

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2015

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Vol. 17, nr 2

96--102

EN

The conducted studies were focused on the development of the gypsum material exhibiting self-cleaning properties. To this end, the raw gypsum was mixed with unique TiO2-based photocatalysts, previously modified by nitrogen and/ or carbon doping. The photocatalytic activity of the obtained gypsum plasters was evaluated trough the degradation of model organic compound (Reactive Red 198) under UV-vis irradiation. The impact of the photocatalysts presence on the physicochemical properties of the obtained gypsum plasters was evaluated. Furthermore, the role of non-metals presence on the photocatalytic properties of the TiO2 was determined. It was confirmed that the addition of N,C co-modified titanium dioxide into gypsum bestows this material with self-cleaning properties. The highest dye removal rate was displayed by the gypsum plaster containing optimal amount (10 wt%) of co-modified TiO2/N,C photocatalyst, after 20 hours of UV-vis irradiation.

8

NOx photocatalytic degradation on gypsum plates modified by TiO2-N,C photocatalysts

Janus M., Bubacz K., Zatorska J., Kusiak-Nejman E., Czyżewski A., Morawski A. W.

Polish Journal of Chemical Technology

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2015

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Vol. 17, nr 3

8--12

EN

In presented studies the photocatalytic decomposition of NOx on gypsum plates modified by TiO2-N,Cphotocatalysts were presented. The gypsum plates were obtained by addition of 10 or 20 wt.% of different types of titanium dioxide, such as: pure TiO2 and carbon and nitrogen co-modified TiO2 (TiO2-N,C) to gypsum. TiO2-N,C photocatalysts were obtained by heating up the starting TiO2 (Grupa Azoty Zakłady Chemiczne Police S.A) in the atmosphere of ammonia and carbon at the temperature: 100, 300 i 600ºC. Photocatalyst were characterized by FTIR/DRS, UVVis/DR, BET and XRD methods. Moreover the compressive strength tests of modified gypsum were also done. Photocatalytic activity of gypsum plates was done during NOx decomposition. The highest photocatalytic activity has gypsum with 20 wt.% addition of TiO2-N,C obtained at 300ºC.

9

Magnetic resonance study of co-modified (Co,N)-TiO2 nanocomposites

Guskos N., Zolnierkiewicz G., Guskos A., Typek J., Berczynski P., Dolat D., Mozia S., Aidinis C., Morawski A. W.

Nukleonika

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2015

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Vol. 60, No. 3, part 1

411--416

EN

Three nCo,N-TiO2 nanocomposites (where cobalt concentration index n = 1, 5 and 10 wt %) were prepared and investigated by magnetic resonance spectroscopy at room temperature. Ferromagnetic resonance (FMR) lines of magnetic cobalt agglomerated nanoparticle were dominant in all registered spectra. The relaxation processes and magnetic anisotropy of the investigated spin system essentially depended on the concentration of cobalt ions. It is suggested that the samples contained two magnetic types of sublattices forming a strongly correlated spin system. It is suggested that the existence of strongly correlated magnetic system has an essential infl uence of the photocatalytic properties of the studied nanocomposites.

10

Badania nad przeciwgrzybowymi właściwościami farb fotokatalitycznych

Markowska-Szczupak A., Tomaszewska M., Morszczyzna A., Morawski A. W.

Przemysł Chemiczny

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2014

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T. 93, nr 5

766-770

PL

Badano właściwości przeciwgrzybowe czterech komercyjnych farb serii Titanium: lateksowej LX, akrylowej IN oraz silikatowej FA i DR na stałym podłożu mikrobiologicznym typu MEA (grubość powłoki ok. 2 mm). Określono również aktywność antygrzybową rozcieńczonych farb fotokatalitycznych w hodowlach w ciemności i świetle widzialnym UV-VIS w temp. 25°C. W badaniach wykorzystano szczepy grzybów pleśniowych należące do gatunków Aspergillus versicolor, A. niger, Penicillium chrysogenum, Stachybotrys chartarum, Alternaria alternata i Cladosporium cladosporoides. Stopień inhibicji rozwoju grzybni tworzonej przez badane grzyby pleśniowe zależał od składu farb, stopnia ich rozcieńczenia, warunków hodowli (obecność światła) oraz gatunku grzybów. Najlepsze właściwości antygrzybowe wykazała farba DR. Wodorozcieńczalne farby IN i LX miały mniejszy wpływ ma wzrost badanych grzybów pleśniowych. Rozcieńczenie farb spowodowało obniżenie ich aktywności przeciwgrzybowej.

EN

Four com. TiO2-contg. photocatalytic paints were studied for antifungal activity on solid medium substrate (coating thickness 2 mm). Mould fungi Aspergillus versicolor, A. niger, Penicillium chrysogenum, Stachybotrys chartarum, Alternaria alternata, Cladosporium cladosporoides strains were used in the study. The inhibition of fungal growth depended on the paint compn., degree of diln., conditions (dark or light) and fungal species. The silicate paint showed the highest antifungal activity.

11

Reaktory fotokatalityczne do oczyszczania wody i ścieków

Brożek P., Janus M., Morawski A. W., Mozia S.

Przemysł Chemiczny

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2013

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T. 92, nr 10

1929-1936

PL

Wśród najnowszych technologii, intensywnie rozwijanych w ostatnich kilkudziesięciu latach, znalazła się fotokataliza, będąca jednym z zaawansowanych procesów utleniania. Przedstawiono podstawy fotokatalizy heterogenicznej oraz przegląd opisanych w literaturze reaktorów fotokatalitycznych, stosowanych do usuwania zanieczyszczeń z wody. Omówiono podział fotoreaktorów, z uwzględnieniem sposobu pracy, źródła promieniowania oraz sposobu wprowadzenia fotokatalizatora. Przedstawiono przykładowe reaktory laboratoryjne oraz zaprezentowano obecny stan badań i rozwoju w obszarze reaktorów pilotażowych.

EN

A review, with 74 refs., of lab. and pilot-scale photoreactors with various sources of irradn. and manners of photocatalyst application.

12

Evaluation of Performance of Hybrid Photolysis-DCMD and Photocatalysis-DCMD Systems Utilizing UV-C Radiation for Removal of Diclofenac Sodium Salt from Water

Mozia S., Darowna D., Przepiórski J., Morawski A. W.

Polish Journal of Chemical Technology

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2013

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Vol. 15, nr 1

51-60

EN

The removal of a non-steroidal anti-inflammatory drug (NSAID) diclofenac sodium salt (DCF, C14H10Cl2NNaO2) from water in two hybrid systems coupling photolysis or photocatalysis with direct contact membrane distillation (DCMD) is presented. A UV-C germicidal lamp was used as a source of irradiation. The initial concentration of DCF was in the range of 0.005-0.15 mmol/dm3 and the TiO2 AeroxideŽ P25 loading (hybrid photocatalysis-DCMD) ranged from 0.05 to 0.4 g/dm3. Regardless of the applied hybrid system and the initial concentration of DCF, the model drug was completely decomposed within 4h of irradiation or less. Mineralization was less efficient than photodecomposition. In case of the hybrid photolysis-DCMD process the efficiency of TOC degradation after 5h of irradiation ranged from 27.3-48.7% depending on the DCF initial concentration. The addition of TiO2 allowed to improve the efficiency of TOC removal. The highest degradation rate was obtained at 0.3 gTiO2/dm3. During the process conducted with the lowest DCF initial concentrations (0.005-0.025 mmol/dm3) a complete mineralization was obtained. However, when higher initial amounts of DCF were used (0.05-0.15 mmol/dm3), the efficiency of TOC degradation was in the range of 82.5-85%. The quality of distillate was high regardless of the system: DCF was not detected, TOC concentration did not exceeded 0.7 mg/dm3 (1.9 mg/dm3 in permeate) and conductivity was lower than 1.6 žS/cm.

13

Badania nad rozkładem benzo[a]pirenu na powierzchni farby o właściwościach fotokatalitycznych

Orlikowski J., Tryba B., Morawski A. W.

Przemysł Chemiczny

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2012

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T. 91, nr 9

1775-1778

PL

Przeprowadzono fotokatalityczny rozkład benzo[a]pirenu (BAP) na powierzchni farby o właściwościach fotokatalitycznych zawierającej TiO₂. Do badań wykorzystano farbę fotokatalityczną firmy Pigment, którą naniesiono na szklaną płytkę. BAP naniesiony był na powierzchnię farby z roztworu acetonu. Badania fotokatalitycznego rozkładu BAP prowadzone były pod wpływem naświetlania sztucznym światłem słonecznym. Stężenie BAP na powierzchni farby analizowano na podstawie pomiarów widm UV -VIS/DR in situ, natomiast zmianę powierzchni chemicznej farby z BAP podczas jego fotokatalitycznego rozkładu obserwowano na wykonanych in situ pomiarach widm w podczerwieni (FT-IR/DRS). Badania UV-VIS/DR próbek wykazały stopniowe zanikanie pików charakterystycznych dla BAP wraz z czasem naświetlania, a badania FT-IR/DRS wzrost intensywności pasm pochodzących od produktów jego rozkładu. Po upływie 900 h na widmach UV-VIS/DR nastąpił niemal całkowity zanik sygnałów BAP na powierzchni farby fotokatalitycznej.

EN

Benzo[a]pyrene was deposited in AcMe soln. on the surface of TiO₂-contg. photocatalytic paint supported on glass plates and decompd. under artificial solar light irradn. A gradual disappearance of IR peaks attributed to benzo[a]pyrene was obsd. After 900 h of irradn. almost complete degrdn. of benzo[a]pyrene was achieved.

14

Photocatalytic properties of transparent TiO2 coatings doped with neodymium

Wojcieszak D., Kaczmarek D., Domaradzki J., Mazur M., Morawski A. W., Janus M., Prociów E., Gemmellaro P.

Polish Journal of Chemical Technology

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2012

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Vol. 14, nr 3

1-7

EN

In this work photocatalytic properties of TiO2 thin fi lms doped with 8.51 at. % of Nd were described. The self-cleaning phenomenon of thin fi lms was discussed together with the structural, optical and surface properties of prepared thin fi lms. Transparent coatings based on titanium dioxide were manufactured by high-energy reactive magnetron sputtering process. Incorporation of Nd during sputtering process results in amorphous behavior, without a signifi cant infl uence on transparency and colour as compared to the undoped TiO2-rutile matrix. Nevertheless, doping with neodymium doubles the photocatalytic activity of the matrix due to higher quantity of photo-generated charge carriers and more effi cient mechanism of energy transfer.

15

Photocatalytic mineralisation of humic acids using TiO2 modified by tungsten dioxide/ hydrogen peroxide

Tryba B., Piszcz M., Borowiak-Paleń E., Grzmil B., Morawski A. W.

Polish Journal of Chemical Technology

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2012

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Vol. 14, nr 2

54-61

EN

TiO2 of anatase structure was modified by tungsten dioxide and H2O2 in order to obtain WO3-TiO2 photocatalyst with enhanced photocatalytic activity under both, UV and artificial solar light irradiations. WO2 was dissolved in 30% H2O2 and mixed with TiO2 in a vacuum evaporator at 70°C. Such modified TiO2 was dried and then calcinated at 400 and 600°C.The prepared samples and unmodified TiO2 were used for the photocatalytic decomposition of humic acids (Leonardite standard IHSS) in the aqueous solution under irradiations of both, UV and artificial solar light. Modification of TiO2 with tungsten dioxide and H2O2 improved separation of free carriers in TiO2 which resulted in the increase of OH radicals formation. Calcination caused an increase of anatase crystals and higher yield in OH radicals. The uncalcined samples showed high abilities for the adsorption of HA. Combination of adsorption abilities and photocatalytic activity of photocatalyst caused that the uncalcined TiO2 modified with WO2/H2O2 showed the shortest time of HA mineralisation. The mineralisation of HA under the artificial solar light was much lower than under the UV. It was proved that, although OH radicals are powerful in the decomposition of HA, adsorption can facilitate the contact of the adsorbed molecules with the photocatalyst surface and accelerate their photocatalytic decomposition.

16

Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

Karolczyk J., Mozia S., Morawski A. W., Przepiórski J.

Polish Journal of Chemical Technology

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2012

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Vol. 14, nr 4

95-99

EN

Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.

17

Disinfection of E. coli by carbon modified TiO2 photocatalysts

Janus M., Markowska-Szczupak A., Kusiak-Nejman E., Morawski A. W.

Environment Protection Engineering

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2012

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Vol. 38, nr 2

89--97

EN

Photocatalytic disinfection of Escherichia coli by carbon modified TiO 2 photocatalysts was tested under UV and visible light irradiation. Carbon modification of TiO2 in a pressure reactor was conducted at 120°C for 4 h. For modification purposes, five alcohols were used (methanol, ethanol, n-butanol, 2-butanol, and tert-butanol). The amount of carbon in photocatalysts was calculated with a termogravimetric analyser. It was found that photocatalysts with low content of carbon have better antibacterial ability under visible light irradiation and photocatalysts with higher content of carbon have better antibacterial ability under UV light irradiation.

18

New photocatalyst for decomposition of humic acids in photocatalysis and photo-Fenton processes

Tryba B., Brożek P., Piszcz M., Morawski A. W.

Polish Journal of Chemical Technology

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2011

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Vol. 13, nr 4

8-14

EN

Humic acid Leonardite IHSS standard was decomposed on TiO2 and TiO2 modifi ed by FeC2O4 via the photocatalysis and photo-Fenton processes under UV irradiation. Humic acid (HA) were favorable adsorbed on TiO2 surface and followed decomposition during UV irradiation faster on TiO2 than on the modifi ed samples. However, when H2O2 was added to the solution, the photo-Fenton process occurred on the prepared TiO2 samples, contained iron together with photocatalysis and high acceleration of HA decomposition was observed. In this case the mineralization degree was much higher than in the applied photocatalysis only, around 75% HA (with concentration of 18 mg/L) was mineralized after 3 h of adsorption and 5 h of UV irradiation in the presence of H2O2 and modifi ed TiO2 whereas on TiO2 mineralisation of HA occurred in around 45% only. The measured fl uorescence spectra of HA solutions showed that in the presence of H2O2 polycyclic aromatics were rapidly oxidized to the lower size products such as alcohols, aldehydes, ketones and carboxylic acids, what accelerated the process of HA decomposition.

19

Wykorzystanie ditlenku tytanu aktywowanego światłem do oczyszczania powietrza z zanieczyszczeń organicznych i nieorganicznych

Markowska-Szczupak A., Morawski A. W.

Ochrona Powietrza i Problemy Odpadów

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2011

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Vol. 45, nr 2

60-69

PL

Niniejszy artykuł stanowi przegląd literatury dotyczącej wykorzystania fotokatalitycznych właściwości tytanu IV, w procesach oczyszczania powietrza z zanieczyszczeń organicznych i nieorganicznych, pochodzących z różnych źródeł. W pierwszej części pracy przedstawiono podstawy teoretyczne procesu fotokatalizy, z uwzględnieniem właściwości fizykochemicznych TiO2. W części drugiej omówiono wpływ materiałów budowlanych, zawierających ditlenek tytanu na zmniejszenie zanieczyszczeń w środowisku zewnętrznym i na poziom tzw. gazów cieplarnianych. Dokonano również oceny potencjalnych możliwości zastosowania procesów fotokatalitycznych na większą skalę. Kolejny rozdział poświęcono sposobom oczyszczania powietrza wewnętrznego. Szczególną uwagę zwrócono na filtry wewnętrzne oraz materiały samoczyszczące i samodezynfekujące, które mogą się przyczynić do poprawy jakości powietrza i życia w budynkach użyteczności publicznej takich jak: szkoły, przedszkola biblioteki, szpitale itp.

EN

The paper presents a review of literature on the application of light-activated titanium dioxide to destruct volatile organic and inorganic compounds in indoor and outdoor air. In the first part of the article the fundamentals of the photocatalysis are presented. The second part is focused on the major applications of TiO2-based photocatalytic building materials taking into account their impact on the reduction of environmental pollution, self-cleaning and self-disinfecting. Some recommendations are given for the future work concerning the evaluation of titanium dioxide performance aiming at the reduction of the smog and greenhouse gases problems in a large scale. The ability of photocatalytic indoor paints and filters to reduce chemical indoor air impurities and odours is presented. Furthermore, practical applications of various photocatalytic products containing TiO2 for indoor air purification in public buildings such as schools, libraries, hospitals etc. are shown.

20

A preliminary study on antifungal effect of TiO2-based paints in natural indoor light

Markowska-Szczupak A., Ulfig K., Grzmil B., Morawski A. W.

Polish Journal of Chemical Technology

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2010

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Vol. 12, nr 4

53-57

EN

The antifungal activity of four commercial photocatalytic paints (KEIM Ecosil ME, Titanium FA, Photo Silicate and Silicate D) in natural indoor light was investigated. The paints contained TiO2 in rutile and anatase crystalline forms as evidenced by means of the X-ray diffraction analysis. In most cases the paints inhibited growth of fungi viz. Trichoderma viride, Aspergillus niger, Coonemeria crustacea, Eurotium herbariorum, and Dactylomyces sp . The KEIM Ecosil ME paint displayed the highest antifungal effect in the light, which could be explained with the highest anatase content. The paint antifungal activity and the fungal sensitivity to the TiO2- mediated photocatalytic reaction both decreased in the following orders: KEIM Ecosil ME > Titanium FA > Photo Silicate > Silicate D and T. viride > Dactylomyces sp. > A. niger > E. herbariorum.