Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

Hossain, Sayed Mukit; Park, Hee-Ju; Kang, Hui; Kim, Jong Beom; Tijing, Leonard D.; Rhee, Inkyu; Jun, Young‐Si; Shon, Ho Kyong; Kim, Jong-Ho

doi:10.3390/catal10040452

Cited by 12 publications

(5 citation statements)

References 55 publications

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“…A number of our previous studies have already established the atmospheric NO removal mechanism of UV-induced TiO 2 [5][6][7][8]12,33]. Upon UV irradiation, the photocatalysts get excited and generate electron-hole pairs (e − /h + ).…”

Section: No Removal Mechanismmentioning

confidence: 99%

“…The oxidation of NO is associated with the difference between how much more negative the CB band potential is (than the O 2 /•O 2 − potential of 0.33 eV) and how considerably positive the VB band potential is (than the OH − /•OH potential of 1.99 eV). The reactions correlate to the generation of radicals, and the following is a plausible route for NO oxidation [6,7,33]:…”

Section: No Removal Mechanismmentioning

confidence: 99%

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A Study on the Evaluation Methods of Nitrogen Oxide Removal Performance of Photocatalytic Concrete for Outdoor Applications

et al. 2022

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In Korea, the issue of particulate matter pollution is growing, and many solutions are being developed to deal with it. Photocatalytic technology has been found to be helpful in removing precursors such as nitrogen oxides that cause particulate matter. In a microcosm setup, ISO 22197-1 has been successfully used to quantify the removal of nitrogen oxides from the specimen to which the photocatalyst is applied. However, owing to a lack of suitable tools, on-site measurement of real-scale efficacy is difficult. Depending on the substrate and surrounding circumstances at the application location, the photocatalyst may function at varying levels. Additionally, the expected photocatalytic effect may differ depending on the ambient air quality and sunlight irradiation intensity. This article describes two approaches for studying outdoor concrete photocatalysis. Standard gas measurement and dual-reactor measurement are the recommended evaluation approaches. The standard gas measurement method was found useful for assessing the applied photocatalyst itself as an outcome of field assessment. The performance of photocatalysts at different sites was found to be mutually exclusive and comparable. Over 180 min, on a building roof deck, the NO removal by the standard gas method was 0.68 ppm, whereas, at two shaded locations, the removal amount was 0.51 ppm (side wall) and 0.24 ppm (underpass) for 300 min. The dual reactor measurement approach, on the other hand, was discovered to be one of the most suitable methods for assessing how much of an improvement there has been in the air quality in areas where photocatalysts have been placed.

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Section: No Removal Mechanismmentioning

confidence: 99%

Section: No Removal Mechanismmentioning

confidence: 99%

A Study on the Evaluation Methods of Nitrogen Oxide Removal Performance of Photocatalytic Concrete for Outdoor Applications

et al. 2022

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“…A laboratory-scale photocatalytic reactor was used, following ISO 22197-1, to examine the extent of NO x photooxidation. The specifics of the method are listed elsewhere [14][15][16]. Figure 10 shows the diagram of the device used to test the photocatalytic efficiency of the as-prepared samples.…”

Section: Removal Of No X Under Uv Irradiationmentioning

confidence: 99%

“…Under UV (λ < 390 nm) irradiance, TiO 2 produces a series of photochemical reactions that promote electrons (e − ) from the valence band (VB) to the CB, leaving a positively charged hole (h + ) behind [14]. As a result of the generation of the e − and h + , reactive oxygen species (ROS), for instance, superoxide species (•O 2 − ) or hydroxyl radicals (•OH), are produced from the surrounding O 2 and H 2 O [15,16]. These ROS subsequently photodegrade the target pollutants [8,9,13].…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic/Hydrophobic Silane Grafting on TiO2 Nanoparticles: Photocatalytic Paint for Atmospheric Cleaning

et al. 2021

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In this study, anatase titania was utilized to prepare a durable photocatalytic paint with substantially enhanced photoactivity towards NO oxidation. Consequently, to alleviate the choking effect of photocatalytic paint and incorporate self-cleaning properties, the parent anatase titania was modified with Al(OH)3 and a number of organosilane (tetraethyl orthosilicate, propyltrimethoxysilane, triethoxy(octadecyl)silane, and trimethylchlorosilane) coatings. A facile hydrolysis approach in ethanol was employed to coat the parent titania. To facilitate uniform dispersion in photocatalytic paint and strong bonding with the prevailing organic matrix, it is necessary to avail both hydrophobic and hydrophilic regions on the titania surface. Therefore, during the preparation of modified titania, the weight proportion of the total weight of alkyl silane and trimethylchlorosilane was adjusted to a ratio of 1:1. As the parent titania has few hydrophilic portions on the surface, tetraethyl orthosilicate was coated with an organic silane having an extended alkyl group as a hydrophobic group and tetraethyl orthosilicate as a hydrophilic group. When these two silane mixtures are hydrolyzed simultaneously and coated on the surface of parent titania, a portion containing a large amount of tetraethyl orthosilicate becomes hydrophilic, and a part containing an alkyl silane becomes hydrophobic. The surface morphology and the modified titania’s optical attributes were assessed using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), UV-Vis diffuse reflectance spectroscopy (DRS), and electrochemical impedance spectroscopy (EIS) analysis. Based on the advanced characterizations, the NO removal mechanism of the modified titania is reported. The modified titania coated at 20 wt.% on the ceramic substrate was found to remove ~18% of NO under one h of UV irradiation. An extensive UV durability test was also carried out, whereby the coated surface with modified titania was exposed to 350 W/m2 of UV irradiance for 2 weeks. The results indicated that the coated surface appeared to preserve the self-cleaning property even after oil spraying. Hence, facile hydrolysis of multiple organosilane in ethanol could be a viable approach to design the coating on anatase titania for the fabrication of durable photoactive paint.

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“…Among various single-component photocatalysts, TiO 2 has been considered one of the most promising photocatalyst for nitrogen fixation in real applications due to its non-toxicity, chemical stability, corrosion resistance and high oxidation/reduction capacity [23][24][25]. However, the photocatalytic activity of TiO 2 still suffered from its large band gap (3.2 eV for anatase), and the fast recombining of photo-generated electron-hole pairs [26]. In order to solve the above problems, various methods were explored to tailor its optical and electronic properties by surface defect states via heterogeneity metal or non-metal elements doping, etc.…”

Section: Introductionmentioning

confidence: 99%

Efficient Catalytic Fixation Nitrogen Activity Under Visible Light by Molybdenum Doped Mesoporous TiO2

Zhai

et al. 2021

Catal Lett

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An efficient photocatalyst capable of forming oxygen defects on the surface of mesoporous TiO 2 was obtained via doping molybdenum ions which can obviously broaden the absorption range of TiO 2 under visible light and reduce the recombination rate of photogenerated electron-hole pairs. The surface oxygen defects (Vo) introduced by metal molybdenum doping will adsorb and activate target molecules on the semiconductor surface. The effect of Vo content, modulated by Mo ions doping, on the photocatalytic NH 3 production rates of the as-obtained samples was investigated. The optimal photocatalytic NH 3 generation rate of Mo-doped TiO 2 could reach 183.02 μmol•g −1 •h −1 under visible light. PL and photoelectrochemical tests results demonstrated that Mo dopants could promote photogenerated carrier's separation and restrain the recombination of carriers. Furthermore, the photocatalysts also exhibited good stability in the recycling experiments for 5 runs. The enhanced photocatalytic activity is owing to the Vo defect states, created by the Mo ion-doped, which benefits to the N 2 adsorption and reduction at the Ti 4+ activation center during the nitrogen fixation process.

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Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

Cited by 12 publications

References 55 publications

A Study on the Evaluation Methods of Nitrogen Oxide Removal Performance of Photocatalytic Concrete for Outdoor Applications

A Study on the Evaluation Methods of Nitrogen Oxide Removal Performance of Photocatalytic Concrete for Outdoor Applications

Hydrophilic/Hydrophobic Silane Grafting on TiO2 Nanoparticles: Photocatalytic Paint for Atmospheric Cleaning

Efficient Catalytic Fixation Nitrogen Activity Under Visible Light by Molybdenum Doped Mesoporous TiO2

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