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Tytuł:
Natural sun-light assisted photocatalytic and electrocatalytic activity of WO3-TiO2 novel nanomaterial
Autorzy:
Kamalakkannan, J.
Balraj, N.
Powiązania:
https://bibliotekanauki.pl/articles/1157041.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Photocatalysis
Reusability
Sun light
Opis:
The WO3-TiO2 novel nanomaterial was synthesized by precipitation method and sonication technique. The nanomaterial for the degradation of malachite green (MAG) dye under natural sun light irradiation. The synthesized nanomaterial is characterized by HR-SEM with EDX, PL and UV-Vis DRS analysis. The photodegradation of MAG at various parameters are reported. The mechanisms of dye degradation in natural sun light explain the higher photocatalytic activity of the catalyst. The result indicates the advantage of wastewater treatment by it. The electrochemical study from DSSC analysis showed increased current by WO3-TiO2 nanomaterial. It was proposed that the catalyst was found to be stable and reusable.
Źródło:
World Scientific News; 2018, 94, 2; 276-286
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NOx photocatalytic degradation on gypsum plates modified by TiO2-N,C photocatalysts
Autorzy:
Janus, M.
Bubacz, K.
Zatorska, J.
Kusiak-Nejman, E.
Czyżewski, A.
Morawski, A. W.
Powiązania:
https://bibliotekanauki.pl/articles/779427.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
photocatalysis
modified gypsum
NOx
Opis:
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.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 8-12
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The cytotoxicity verification of the VOCs removal by means of photocatalysis
Autorzy:
Czarny, A.
Zaczyńska, E.
Hirszfeld, L.
Górniak, A.
Janicka, A.
Zawiślak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073650.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
cytotoxicity
photocatalysis
volatile organic compounds
Opis:
This paper constitutes the approach to correlate the results of gas purification properties performed with aid of photocatalysis with the cytotoxicity test results. The gas purification by means of photocatalysis is a subject well known a profusely described in literature. Easiness and continence of application causes the photocatalysis to be used in variety of industries, however this paper considers only automotive industry application. The effectiveness of photocatalysis have been proven experimentally by vast number of researchers. However, the literature contains only the information about the level of volatile organic compounds identification and reduction. The toxicity measure in terms of living cells was not yet fully tested and described in literature. Therefore, the standard chromatography test which enables quantitative identification of volatile organic compounds was confronted with a cytotoxicity tests revealing the virtual toxicity of gases before and after photocatalysis.
Źródło:
Journal of Polish CIMEEAC; 2015, 10, 1; 37--44
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoparticles for water disinfection by photocatalysis : a review
Autorzy:
Bodzek, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2173783.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanoparticles
photocatalysis
water and wastewater disinfection
Opis:
Photocatalysis is an efficient and ecological method of water and wastewater disinfection. During the process, various microorganisms are deactivated, including Gram-positive and Gram-negative bacteria, for example Escherichia coli, Staphylococcus aureus, Streptococcus pneumonia, and so on, fungi like Aspergillus niger, Fusarium graminearum, algea (Tetraselmis suecica, Amphidinium carterae, and so on) and viruses. Titanium dioxide (TiO2) is the most commonly used material due to its price and high oxidation efficiency; it is easy to modify using both physical and chemical methods, what allows for its wide use in industrial scale. Intensive research on novel photocatalysts (e.g. ZnO and carbon based photocatalysis like graphene, carbon nanotube, carbon nitride and others) has been carried out. The future development of nano-disinfection containing metal/metal oxides and carbon based nanoparticles should focus on: improving disinfection efficiency through different manufacturing strategies, proper clarification and understanding of the role and mechanism of interaction of the nano-material with the microorganisms, progress in scaling up the production of commercial nano-photocatalysts, determination of the extent of environmental release of nano-photocatalysts and their toxicity.
Źródło:
Archives of Environmental Protection; 2022, 48, 1; 3--17
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gray Water Recovery System Model by Solar Photocatalysis with TiO2 Nanoparticles for Crop Irrigation
Autorzy:
Carbajal-Morán, Hipólito
Zárate-Quiñones, Rosa H.
Márquez-Camarena, Javier F.
Powiązania:
https://bibliotekanauki.pl/articles/1839657.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
polluted water
solar radiation
nanoparticles
photocatalysis
Opis:
The objective of the study was to establish the configuration of the system model to allow the effective recovery of gray water by solar photocatalysis with TiO2 nanoparticles for irrigation of crops. A programmable solar photoreactor based on an S7 1500 PLC and online measurement sensors were used as materials. The inductive method was used to analyze the samples and the deductive method to determine the water quality. The research design used was experimental based on the response surface methodology (MSR) with 20 experiments, 6 of which were central experiments and 6 were axial experiments; these experiments were carried out on sunny days. As a result of the research, a gray water recovery model was obtained, part of this being an electronic system with a programmable photocatalyst, which allowed the development of the experiments. It was concluded that with a solar UV index of 12.21, a dose of titanium dioxide (TiO2) nanoparticles 1.973 g/L and with an exposure period of 60.041 minutes of the solar photocatalyst to UV radiation on sunny days, gray water was recovered in 90% with a confidence level of 95% and a significance α = 0.05, which translates into excellent quality according to the water quality index established in Peru (ICA-PE).
Źródło:
Journal of Ecological Engineering; 2021, 22, 4; 78-87
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics of the Photocatalytic Decomposition of Bisphenol A on Modified Photocatalysts
Autorzy:
Zawadzki, P.
Kudlek, E.
Dudziak, M.
Powiązania:
https://bibliotekanauki.pl/articles/124140.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
kinetics
photocatalysis
modified photocatalysts
bisphenol A
Opis:
This paper presents the evaluation of the photocatalytic kinetics of bisphenol A decomposition in the presence of commercial titanium(IV) oxide and modified photocatalysts (composites). The following modification methods were used: mechanical mixing, calcination and impregnation. The decomposition process was carried out with the addition of photocatalysts and activated carbon at doses of 100 mg/dm3 and 25 mg/dm3, respectively. The photocatalytic process was performed in a reactor from the Heraeus Company (Warsaw, Poland) with a volume of 0.7 dm3. The reactor was equipped with an immersed medium-pressure mercury lamp with a power of 150 W (λ = 200–580 nm). The degree of bisphenol A decomposition was determined by chromatographic analysis preceded by solid-phase extraction SPE. The qualitative-quantitative analysis was performed using a high-performance liquid chromatograph HPLC (UV detector, λ = 218 nm) from Varian (Warsaw, Poland). The dependence of the BPA decomposition on the duration of irradiation was found, wherein the modified photocatalysts were the most effective (from 75 to 90% after 15 minutes). The order of photocatalyst efficiency has been proposed as follows: TiO2<.sub> < TiO2/AC < Cdextran-TiO2/AC < Cmethanol-TiO2/AC< Cethanol-TiO2/AC < TiO2-AC. The highest degree of decomposition was observed in the presence of TiO2/AC (99%). Numerous studies suggest that the results of the TiO2 photocatalytic oxidation of organic substances fit well with the Langmuir–Hinshelwood (L–H) kinetic model. The kinetic parameters of the photocatalysis process were carried out according to the L-H model. According to the pseudo-first-order parameters, the results showed that the decomposition of bisphenol A was most intensive in the first 15 minutes of the process.
Źródło:
Journal of Ecological Engineering; 2018, 19, 4; 260-268
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of advanced oxidative processes. Degradation of chlorinated organic compounds in ultrafiltration fractions of kraft pulp bleaching effluent
Autorzy:
Fiskari, J.
Kakkonen, A.
Pakkanen, H.
Alén, R.
Powiązania:
https://bibliotekanauki.pl/articles/208297.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photocatalysis
Fenton method
metoda Fentona
fotokataliza
Opis:
Oxidative pretreatment methods such as the Fenton oxidation, ozonation, and photocatalytic treatment have been compared in reducing adsorbable organic halogens (AOX) and chlorophenolic compounds in untreated kraft pulp bleaching effluent. Their efficiency was also studied on effluent ultrafiltration fractions. The Fenton treatment removed all analyzed chlorophenolic compounds from the effluent. Ozonation and photocatalysis appeared to be much less effective methods. The efficiency of the Fenton oxidation appeared to be more pronounced in higher molecular weight effluent fractions. This suggests a novel design, where the filtration stage can be placed after the oxidation, and the high-molecular weight fraction is returned to the Fenton treatment.
Źródło:
Environment Protection Engineering; 2016, 42, 4; 151-159
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic hydrogen production from glycerol - preliminary study using Pt/TiO2 and Pd/TiO2 as catalysts
Fotokatalityczna produkcja wodoru z gliceryny - badania wstępne z wykorzystaniem Pt/TiO2 oraz Pd/TiO2 jako katalizatorów
Autorzy:
Mikołajczyk, K.
Stelmachowski, M.
Gmurek, M.
Zaleska, A.
Diak, M.
Powiązania:
https://bibliotekanauki.pl/articles/126330.pdf
Data publikacji:
2015
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
glycerol
hydrogen
photocatalysis
gliceryna
wodór
fotokataliza
Opis:
Concern for the environment and the use of renewable energy sources are the two main priorities of energy policy combined with the environmental policy based on the principles of sustainable development. Many aspects should be taken into account in the case of energy production based on biomass/biofuels, in particular the possibility of additional by-products formation. When it comes to biodiesel production, the formation of huge amounts of surplus crude glycerol may be such a problem. The well-known, traditional methods of glycerol utilization are ineffective, which was proved by the big price drop in the glycerol market. High hopes to solve this problem are placed in new technologies: bio-conversion of glycerol to various chemicals or energy carriers and photocatalytic conversion to hydrogen. The paper presents the results of some preliminary studies of photocatalytic glycerol conversion to hydrogen. The investigation was focused on proper selection of catalysts and on the search for the optimum conditions of the photocatalytic process using TiO2 doped with platinum or palladium (0.1, 0.5, 1 wt.%). The initial glycerol concentration in the solution was 4.5%. Photocatalysts were obtained by the sol-gel method. The effect of irradiation intensity was achieved by using 2-4 xenon lamps, the power of 75 W each. Gas product was analyzed by gas chromatography. The highest efficiency of hydrogen production (19.33 mmol/g of catalyst·h) was obtained for Pt doped TiO2. The production rate of hydrogen depended on catalyst concentration, the amount of the noble metal in the catalysts, the concentration of glycerol in the solution and the intensity of irradiation.
Efektywna produkcja energii oparta na biomasie/biopaliwach powinna uwzględniać wiele aspektów, w szczególności możliwość powstania dodatkowych produktów ubocznych. W przypadku produkcji biodiesla takim problemem może być zagospodarowanie dużych ilości odpadowej gliceryny powstającej w tym procesie. Dotychczas stosowane tradycyjne metody jej utylizacji okazują się nieefektywne, o czym świadczy duży spadek cen na rynku surowej gliceryny. Duże nadzieje jej korzystnego zagospodarowania wiązane są z nowymi technologiami - biokonwersją do różnych produktów chemicznych i energetycznych oraz fotokatalityczną konwersją do wodoru. W pracy przedstawiono badania przeprowadzone w celu selekcji katalizatorów, które mogą być wykorzystane do konwersji gliceryny, oraz znalezienia optymalnych warunków procesowych. Rozkład gliceryny badano, stosując jako katalizator TiO2 domieszkowany platyną lub palladem (0,1, 0,5, 1% wag.). Stężenie gliceryny w roztworze wynosiło 4,5%. Fotokatalizatory otrzymano metodą zol-żel. Jako źródło światła wykorzystano od 2 do 4 lamp ksenonowych o mocy 75 W. Produkt gazowy analizowano metodą chromatografii gazowej. Najwyższą wydajność produkcji wodoru (19,33 mmola/g kat·h) otrzymano dla fotokatalizatora TiO2 domieszkowanego 0,5% Pt. Efektywność generowania wodoru zależy od rodzaju katalizatora, jego stężenia w roztworze, zawartości metalu szlachetnego w katalizatorze, stężenia gliceryny oraz intensywności naświetlania.
Źródło:
Proceedings of ECOpole; 2015, 9, 1; 111-116
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic degradation of the selected sulfonamides in wastewater
Fotokatalityczna degradacja wybranych sulfonamidów w ściekach
Autorzy:
Ziemiańska, J.
Adamek, E.
Baran, W.
Makowski, A.
Sobczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/126384.pdf
Data publikacji:
2012
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
photocatalysis
sulfonamides
wastewater
fotokataliza
sulfonamidy
ścieki
Opis:
Sulfonamides are antibacterial drugs, the most commonly used in veterinary prophylaxis. To the environment, these drugs are being introduced in several ways. Sulfonamides have the capacity to accumulate in various organisms, for which they may be toxic. Even low concentrations of these drugs may lead to the formation of microbial drug resistance. The aim of this study was to determine the applicability of the process of photocatalysis for the degradation of selected sulfonamides applied to real wastewater and optimization of this method. The process of photocatalytic degradation was studied in real municipal wastewater, synthetic sewage and in distilled water. The process was carried out in open reactors that were UV-A irradiated, with the participation of TiO2-P25, a mixture of FeCl3 and TiO2/FeCl3. It was found that use of the TiO2/FeCl3 mixture brings the best results in the removal of selected sulfonamides. Influence of selected wastewater treatment processes, pH and concentrations of reagents on the efficiency of degradation of sulfonamides from wastewater has been determined. In addition, orders were designated as well as kinetics of studied reaction.
Sulfonamidy są lekami przeciwbakteryjnymi najczęściej używanymi w profilaktyce weterynaryjnej. Do środowiska leki te dostają się różnymi drogami. Sulfonamidy mają zdolność kumulowania się w różnorodnych organizmach, wobec których mogą okazać się toksyczne. Nawet małe stężenie tych leków może prowadzić do wytworzenia się lekooporności drobnoustrojów. Celem pracy było określenie możliwości zastosowania procesu fotokatalizy do degradacji wybranych sulfonamidów aplikowanych do rzeczywistych ścieków oraz optymalizacja tej metody. Proces fotokatalitycznej degradacji badany był w rzeczywistych ściekach komunalnych, w ściekach syntetycznych oraz w wodzie destylowanej. Proces prowadzony był w otwartych reaktorach, które były naświetlane promieniowaniem UV-A, przy udziale TiO2-P25, FeCl3 i mieszaniny TiO2/FeCl3. Stwierdzono, iż zastosowanie mieszaniny TiO2/FeCl3 przynosi najlepsze efekty w usunięciu wybranych sulfonamidów. Określono wpływ wybranych procesów oczyszczania ścieków, pH oraz stężeń reagentów na efektywność degradacji sulfonamidów ze ścieków. Zostały wyznaczone ponadto rzędy badanych reakcji oraz ich kinetyka.
Źródło:
Proceedings of ECOpole; 2012, 6, 1; 92-97
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous photooxidation and photoreduction of phenol and Cr(VI) ions using titania modified with nanosilica
Autorzy:
Kądziołka, Daria
Grzechulska-Damszel, Joanna
Schmidt, Beata
Powiązania:
https://bibliotekanauki.pl/articles/2174823.pdf
Data publikacji:
2022
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
photocatalysis
titanium dioxide
nanosilica
water purification
Opis:
The photocatalytic process of phenol oxidation and Cr(VI) reduction in the presence of nano-silica modified titania was carried out. The activity of composites was tested using two different light sources. The photocatalysts with 10% of nanosilica showed the highest activity. The calcination temperature (200–800 °C) significantly determined the sensitivity of the obtained materials to the light source used. Photocatalysts alternately adsorbed and desorbed Cr(VI) ions from the reaction mixture during irradiation. In the one-component mixture, complete oxidation of phenol was observed using material calcined at 650 °C, after 3 h of UV-VIS irradiation. In the reaction mixture of Cr(VI) and phenol, the highest activity was demonstrated by photocatalyst calcined at 300 °C. The concentration of phenol decreased in proportion to the decrease of chromium ions. The obtained titania-silica composites showed oxidizing properties towards phenol and reductive properties toward Cr(VI) ions.
Źródło:
Polish Journal of Chemical Technology; 2022, 24, 4; 23--29
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Inorganic Compounds on the Process of Photocatalysis of Biologically Active Compounds
Autorzy:
Kudlek, E.
Dudziak, M.
Bohdziewicz, J.
Kamińska, G.
Powiązania:
https://bibliotekanauki.pl/articles/124427.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water environment
organic micropollutants
photocatalysis
cations
anions
Opis:
Constant increase in concentration of organic micropollutants in the water environment influences the development of methods for their effective elimination from various matrices released into aquatic ecosystems. One of widely described in literature processes for the decomposition of hardly-biodegradable pollutants is the process of heterogeneous photocatalysis. The paper presents the influence of inorganic substances on the decomposition of polycyclic aromatic hydrocarbons (anthracene and benzo[a]pyrene), industrial admixtures – octylphenol and pharmaceutical compounds – diclofenac in the photocatalysis process conducted in the presence of TiO2. It has been shown that the presence of Cl– ions did not affect the photochemical reaction of the micropollutant decomposition. Whereas, the presence of CO32–, SO42– and HPO42– ions inhibited the decolonization of octylphenol and diclofenac, while the degradation efficiency of anthracene and benzo[a]pyrene was reduced only by the presence of CO32– and HCO3 – anions. The photooxidation of micropollutants in solutions containing Al3+ oraz Fe3+ cations proceeded with a much lower efficiency than that for solution without inorganic compounds. The analysis of the kinetics of the photocatalytic decomposition of selected micropollutants show a decrease in the reaction rate constant and an increase in their half-life due to the blocking of theactive semiconductor centers by inorganic compounds. In addition,the toxicological analysis inducated the generation of micropollutant oxidation by-products, which aggravate the quality of treated aqueous solutions.
Źródło:
Journal of Ecological Engineering; 2017, 18, 4; 123-129
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation of sertraline in water by suspended and supported TiO2
Autorzy:
Rejek, M.
Grzechulska-Damszel, J.
Powiązania:
https://bibliotekanauki.pl/articles/780043.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
photocatalysis
titanium dioxide
pharmaceuticals
sertraline
water treatment
Opis:
Pharmaceutical pollutants have been detected in many countries in surface and ground water after treatment in wastewater treatment plants. The presented studies concern the photocatalytic removal of one of SSRI antidepressants - sertraline from water using TiO2  photocatalyst. The process was conducted using two laboratory installations with periodic and flow reactors. Two forms of TiO2  was used in the photocatalytic reactions: suspended and supported onto a glass fabric. The studies shown that with increasing initial concentration of pharmaceutical, photoactivity decreases. For the initial concentration of 0.025 g/dm3 , the best results – 94% removal – was achieved for the process conducted in the periodic reactor with TiO2  supported onto a glass fabric.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 2; 107-112
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic properties of transparent TiO2 coatings doped with neodymium
Autorzy:
Wojcieszak, D.
Kaczmarek, D.
Domaradzki, J.
Mazur, M.
Morawski, A. W.
Janus, M.
Prociów, E.
Gemmellaro, P.
Powiązania:
https://bibliotekanauki.pl/articles/779161.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
TiO2
neodymium
photocatalysis
wettability
surface properties
Opis:
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.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 3; 1-7
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of Copper, Iron, and Lead Content in Laboratory Wastewater Using Zinc Oxide Photocatalyst under Solar Irradiation
Autorzy:
Agustina, Tuty Emilia
Habiburrahman, Muhammad
Amalia, Farah
Arita, Susila
Faizal, Muhammad
Novia
Gayatri, Rianyza
Powiązania:
https://bibliotekanauki.pl/articles/2202163.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
AOPs
photocatalysis
heavy metals
sunlight
zinc oxide
Opis:
Heavy metal is a type of metal that has a high density and high toxicity when consumed by living things, especially humans. To prevent the impact of environmental pollution, optimal handling of wastewater containing heavy metals is required, including the wastewater from laboratories. This research aimed to study the effect of pH, catalyst dose, and irradiation time on the reduction of Copper (Cu), Iron (Fe), and Lead (Pb) heavy metals and their application to laboratory wastewater treatment. Among the Advanced Oxidation Processes (AOPs) methods, photocatalysis was chosen to reduce the level of Cu, Fe, and Pb heavy metals where zinc oxide (ZnO) is used as a photocatalyst and the sunlight as a light source. To determine the effect of pH, catalyst dose, and time on the reduction of heavy metal levels, firstly, this research used the synthetic wastewater containing Cu, Fe, or Pb heavy metals. On the basis of the experimental results, it is concluded that the pH value, catalyst dose, and time affect the photocatalytic process, decreasing the levels of Cu, Fe, and Pb metals. The optimum pH value obtained for Cu was at pH 7–8, for Fe it was at pH 6, and for Pb it was at pH 8; in turn, the metal removal percentages were 99.46, 99.91, and 99.70%, respectively. In the photocatalysis of synthetic wastewater, high removal percentage of more than 99% was achieved by using 0.1 g/L catalyst. The optimum decrease of metals occurred in the first 15 minutes of solar irradiation where the removal percentage was close to 100%. In this study, the application of ZnO photocatalyst under solar irradiation can reduce the heavy metals content in the laboratory wastewater by almost 100%, which meets the environmental quality standard for Cu, Fe, and Pb.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 107--115
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paracetamol and ibuprofen removal from aqueous solutions by ozonation and photochemical processes
Autorzy:
Trousil, V.
Palarčík, J.
Blažková, Z.
Kořínková, J.
Machalický, O.
Cakl, J.
Powiązania:
https://bibliotekanauki.pl/articles/208209.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Parachlorella kessleri
paracetamol
ibuprofen
heterogeneous photocatalysis
fotokataliza heterogeniczna
Opis:
The comparative experimental study has been performed of removal of pharmaceuticals such as paracetamol and ibuprofen from aqueous solution by ozonation and photochemical degradation in several types of reactors. Ozone, oxygen, and hydrogen peroxide were used as oxidizing agents. Heterogeneous photocatalysis was carried out in the presence of anatase type TiO2 catalyst. To determine the amount of radiation emitted by the UV lamps and transferred into the reactor, chemical feroxioxalate actinometric experiments were performed. The degree of the pollutant removal was monitored by HPLC, COD, BOD5, and TOC. An ecotoxic biological test of process products with Parachlorella kessleri was also evaluated. The results indicate that the removal of both pharmaceuticals is most effective by heterogeneous photocatalysis. In the UV processes, the degradation rate increased considerably when H2O2 was added. However, the addition of peroxide into the ozonation system improved the ozonation only slightly. All products of the processes tested showed improved biodegradability according to the BOD5/COD ratio and low toxicity to Parachlorella kessleri.
Źródło:
Environment Protection Engineering; 2018, 44, 4; 159-175
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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