Influence of paint components on photoactivity of P25 titania toward NO abatement

Águia, C.; Ângelo, Joana; Madeira, Luís M.; Mendes, Adélio

doi:10.1016/j.polymdegradstab.2011.01.032

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…The catalyst and paint properties are 182 summarized in Table 1 [52]. From the original exterior water-based vinyl paint, half of 183 the pigmentary TiO2 (9 wt.% in wet base) was removed; the photocatalytic paint 184 (henceforth named as P) was, subsequently, formulated by adding 9 wt.% of photo-TiO2 185 PC500 (ca.…”

Section: Photocatalytic Films Preparation and Characterization 180mentioning

confidence: 99%

“…Incoming air filters or air cleaners based on 48 ultraviolet germicidal irradiation, activated carbon, ionization, or ozone generation are 49 the most used methods for air decontamination [3,7]. Nevertheless, photocatalysis is now 50 seen as a valuable option for de-polluting purposes [8][9][10][11][12][13][14][15], mainly because it: i) can be 51 operated at room temperature [16]; ii) air (through water vapour and molecular oxygen) 52 can be used as the source of oxidant [17], iii) degrades/mineralizes a wide range of 53 organic pollutants into harmless or easily neutralized final products (CO2, H2O and 54 mineral acids) [18]; iv) can take advantage of solar radiation for performing the charge 55 separation at the semiconductor [19]. Furthermore, semiconductor titanium dioxide 56 (TiO2) is commonly employed as photocatalyst in photocatalytic oxidation (PCO) 57 processes due to its inexpensiveness, resistance to photocorrosion, high oxidative power, 58…”

Section: Introduction 45mentioning

confidence: 99%

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Are TiO2-based exterior paints useful catalysts for gas-phase photooxidation processes? A case study on n-decane abatement for air detoxification

Monteiro¹,

Lopes²,

Silva³

et al. 2014

Applied Catalysis B: Environmental

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26n-Decane is a saturated long-chain hydrocarbon, belonging to the family of the 27 volatile organic compounds (VOCs), which is persistently present in indoor air of several 28 industrial closed facilities. Due to the VOCs environmental impact, all efforts that have 29 been made during the last decades to degrade this kind of air pollutants are extremely 30 important. Accordingly, the present paper reports n-decane photooxidation studies carried 31 out in an annular photoreactor under simulated solar irradiation and employing a catalytic 32 bed made of cellulose acetate monoliths coated with a photocatalytic paint. The influence 33 of the feed flow rate, n-decane concentration, relative humidity, and incident irradiance 34 on the n-decane degradation kinetics was assessed. Within this work, n-decane 35 photodegradations higher than 90% were achieved, depending on the experimental 36 conditions. Additionally, a phenomenological reaction rate model of the n-decane 37 photocatalytic oxidation was proposed and assessed. The proposed model assumes that 38 n-decane and water molecules compete for different active sites on the catalyst surface. 39Finally, despite the high n-decane photodegradation achieved, reaction by-products were 40 identified and, based on these compounds, a reaction mechanism was formulated. 41 42

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Section: Photocatalytic Films Preparation and Characterization 180mentioning

confidence: 99%

Section: Introduction 45mentioning

confidence: 99%

Are TiO2-based exterior paints useful catalysts for gas-phase photooxidation processes? A case study on n-decane abatement for air detoxification

Monteiro¹,

Lopes²,

Silva³

et al. 2014

Applied Catalysis B: Environmental

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“…It has been confirmed that there is a mutual effect between photocatalyst and cementitious matrix regarding to the degradation of NOx, which was done because of the adsorption properties of cement [47]. Some reports mentioned that wet mixing paint with photo-TiO2 (P25) reduce the photoactivity of the TiO2 due to the higher dispersion of photocatalyst on the paint matrix [48][49]. CaCO3 in the paint has been deduced to make interaction with the photocatalyst, hence prolonged the photoactivity to reach the steady-state.…”

Section: Influence Of Binder On Decolorization Of Four Reactive Dyesmentioning

confidence: 98%

“…CaCO3 in the paint has been deduced to make interaction with the photocatalyst, hence prolonged the photoactivity to reach the steady-state. The organic compounds of paint (binder, dispersing agents, and other additives) were also responsible for covering the photoactivity [49]. The cyanoacrylate glue also hid the photocatalyst, thus reducing the degradation activity [50].…”

Section: Influence Of Binder On Decolorization Of Four Reactive Dyesmentioning

confidence: 99%

Solar Based Photocatalytic Decolorization of Four Commercial Reactive Dyes Utilizing Bound TiO2-Fe3O4 Nanocomposite

2018

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Dye effluent is one of the most prominent source of water contamination. This study investigated the solar based photocatalytic decolorization of four commercial reactive dyes, which are Reactive Turquoise Blue G 133, Reactive Yellow M4g, Reactive Bordeaux B, on three kind of binders as the support, specifically cyanoacrylate glue, oil-based paint, and white Portland cement on PVC plate. TiO2-Fe3O4 was synthesized using sol-gel method and placed in muffle furnace at 773 K. The composite of TiO2-Fe3O4 was characterized using SEM-EDX and XRD. White cement emerged as the best binder in term of the color removal efficiency of all four dyes compared to other binders, which were more than 90% color removal after 3 h of solar irradiation. Moreover, there was significant enhancement on color removal using immobilized photocatalyst on white cement compared to mobile photocatalyst. The kinetic of the decolorization performance followed the pseudo-firstorder reaction. The apparent reaction rate constant was found to decrease along with the increase of the dye concentration. The photodecolorization kinetics fitted the Langmuir-Hinshelwood model. These protocols and results can be applied into textile industrial primary wastewater treatment using solar as a sustainable light and energy source. ABSTRAKLimbah pewarna cair merupakan salah satu sumber kontaminasi air yang utama. Penelitian ini menginvestigasi proses dekolorisasi empat pewarna reaktif komersial, yakni Reactive Turquoise Blue G 133, Reactive Yellow M4g, Reactive Bordeaux B, dan Reactive Red M8b berbasis reaksi fotokatalisis TiO2-Fe3O4 terimobilisasi oleh tiga pengikat, lem sianoakrilat, cat minyak, dan semen putih, menggunakan cahaya matahari pada plat PVC. TiO2-Fe3O4 disintesis dengan metode sol-gel dan dipanaskan di furnace pada suhu 773 K. Setelah itu, komposit TiO2-Fe3O4 dikarakterisasi dengan analisis SEM-EDX dan XRD. Hasil menunjukkan bahwa semen putih bertindak sebagai pengikat terbaik yang berhasil memberikan nilai efisiensi dekolorisasi paling tinggi untuk keempat warna, yakni diatas 90% dekolorisasi setelah 3 jam penyinaran matahari. Bahkan, ada peningkatan efisiensi dekolorisasi yang signifikan untuk fotokatalis yang difiksasi pada semen putih dibanding fotokatalis bebas. Kinetika dekolorisasi mengikuti reaksi orde pseudo satu. Nilai konstanta laju reaksi semu didapatkan menurun seiring kenaikan konsentrasi pewarna yang diujikan. Kinetika fotodekolorisasi sesuai dengan mode Langmuir-Hinshelwood. Protokol dan hasil didapat mampu diaplikasikan untuk pengelolaan limbah cair primer industri tekstil dengan menggunakan matahari sebagai sumber cahaya dan energi terbarukan. Kata Kunci: dekolorisasi; energi matahari; fotokatalis TiO2-Fe3O4; pewarna reaktif

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“…MS is complementary to other instrumentation (IR, UV–vis, GC‐MS, SEC, and TGA) that can give information on bulk structural or functional material changes. Soft ionization mass spectrometry provides information on the molecular degradation pathways 71, 233–245. MS can also be used to examine degradation products, for example, in work described by Tondi et al200 on oligomeric residues present in the cabonisation (900 °C) of polyflavonoid tannin‐formaldehyde‐furfuryl alcohol or in various HALS degradation studies on polymer coatings 246–249.…”

Section: Environmental Polymer Degradationmentioning

confidence: 99%

Soft ionization mass spectroscopy: Insights into the polymerization mechanism

Soeriyadi

Whittaker

Boyer

et al. 2013

J. Polym. Sci. A Polym. Chem.

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This review (sourced from 6 300 references) is focused on the use of soft ionization mass spectroscopy to characterize the products of polymerization/degradation reactions thereby yielding mechanistic information. We provide a brief description of the different spectrometers techniques available for polymer analyses, including MALDI-TOF, ESI-MS, and a pr ecis of mass spectrometer performance, together with a brief critique summarizing the limitations and advantages of each. On MALDI-TOF, we detail the possible side reactions that can occur when the MALDI-TOF technique is employed to analyze polymers, and emphasize the importance of correct sample preparation. ESI-MS is also given attention and emphasis is placed on the limitations and optimization of samples for successful analyses. This review is presented in the context of polymer science research, with special attention focused on the use of MS data to gain insights into mechanistic processes. V C 2013

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Influence of paint components on photoactivity of P25 titania toward NO abatement

Cited by 16 publications

References 14 publications

Are TiO2-based exterior paints useful catalysts for gas-phase photooxidation processes? A case study on n-decane abatement for air detoxification

Are TiO2-based exterior paints useful catalysts for gas-phase photooxidation processes? A case study on n-decane abatement for air detoxification

Solar Based Photocatalytic Decolorization of Four Commercial Reactive Dyes Utilizing Bound TiO<sub>2</sub>-Fe<sub>3</sub>O<sub>4</sub> Nanocomposite

Soft ionization mass spectroscopy: Insights into the polymerization mechanism

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