Solar-light photocatalytic disinfection using crystalline/amorphous low energy bandgap reduced TiO2

Kim, Young‐Min; Hwang, Hee Min; Wang, Luyang; Kim, Ikjoon; Yoon, Yeoheung; Lee, Hyoyoung

doi:10.1038/srep25212

Cited by 62 publications

(38 citation statements)

References 36 publications

(52 reference statements)

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“…For example, in TiO 2 , a well-known photocatalyst, the oxygen vacancy states generate interstitial Ti 3+ or Ti 3+ states on the surface [14,32,33]. These chemical species induce shallow trap states below the conduction band [34,35]. The metal vacancies in TiO 2 generate trap states near the valence band to broaden the band and increase the hole mobility [36].…”

Section: Surface States At the Solid-liquid Interface For Charge Tranmentioning

confidence: 99%

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

Cho

Lee

2020

Molecules

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Water oxidation and reduction reactions play vital roles in highly efficient hydrogen production conducted by an electrolyzer, in which the enhanced efficiency of the system is apparently accompanied by the development of active electrocatalysts. Solar energy, a sustainable and clean energy source, can supply the kinetic energy to increase the rates of catalytic reactions. In this regard, understanding of the underlying fundamental mechanisms of the photo/electrochemical process is critical for future development. Combining light-absorbing materials with catalysts has become essential to maximizing the efficiency of hydrogen production. To fabricate an efficient absorber-catalysts system, it is imperative to fully understand the vital role of surface/interface modulation for enhanced charge transfer/separation and catalytic activity for a specific reaction. The electronic and chemical structures at the interface are directly correlated to charge carrier movements and subsequent chemical adsorption and reaction of the reactants. Therefore, rational surface modulation can indeed enhance the catalytic efficiency by preventing charge recombination and prompting transfer, increasing the reactant concentration, and ultimately boosting the catalytic reaction. Herein, the authors review recent progress on the surface modification of nanomaterials as photo/electrochemical catalysts for water reduction and oxidation, considering two successive photogenerated charge transfer/separation and catalytic chemical reactions. It is expected that this review paper will be helpful for the future development of photo/electrocatalysts.

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Section: Surface States At the Solid-liquid Interface For Charge Tranmentioning

confidence: 99%

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

Cho

Lee

2020

Molecules

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“…Фотоны здесь поглощаются фотоэлектрокатализатором, чаще всего в неоднородной твердой или твердой среде. ФЭК привлекает все большее внимание как метод очистки воздуха или воды [2][3][4][5][6].…”

Section: аннотацияunclassified

ФОТОEЛЕКТРОКАТАЛІТИЧНА ДЕГРАДАЦІЯ АМIНОАЗОБАРВНИКІВ ДІОКСИДОМ ТИТАНА З ПОВЕРХНЕВИМИ СТАНАМИ Ti3+

Sokolsky

Zahornyi

Lobunets

et al. 2019

J. of Chem. and Tech.

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Process of photoelectrocatalytic aminoazodye methyl orange (MO) degradation was studied in a neutral salt electrolyte under UV irradiation with the titanium dioxide photoelectrocatalyst of nanodispersed morphology and anatase structure synthesized by developed by authors technology from metatitanic acid TiO(OH)2 suspension. The activity was also compared with standard samples (P25 with anatase / rutile phase ratio of 80 : 20, pure rutile). The phase composition, unit cell parameters, and dispersion of the samples were determined. The results of thermogravimetric measurements, characteristics of porosity were also analyzed. The presence of Ti 3+ defects for the synthesized sample could be the reason of band gap decrease in this semiconductor to 2.75 eV and growth of MOs anode oxidation currents under UV irradiation at high scan rates (above 50 mV / s) and potentials below 500 mV (CSE) comparing with standard samples. The photoelectrocatalytic activity of samples is defined by nanodispersity, crystallite morphology, pore size distribution, varies symbatically with the concentration of Ti 3+ , surface hydroxide groups. 80 : 20, чистого рутила). Рентгенографічним методом визначені фазовий склад, параметри елементарної комірки, дисперсність зразків. Проаналізовані результати термогравіметричних вимірювань, характеристики поруватості. Показана присутність дефектів Ti 3+ для синтезованого зразка, що може бути причиною зменшення ширини забороненої зони напівпровідника до 2.75 еВ і збільшення струмів анодного окиснення МО в умовах УФ-опромінення при високих швидкостях сканування (від 50 мВ/с) і потенціалах до 500 мВ (ХСЕ) порівняно із стандартними зразками. Фотоелектрокаталітична активність зразків визначається нанодисперсністю, морфологією кристалітів, розподілом пор за розмірами та змінюється симбатно з концентрацією Тi 3+ , поверхневих гідроксильних груп. Ключові слова: діоксид титану; фотоелектрокаталіз; деградація; аміноазобарвник. Анотація Вивчено процес фотоелектрокаталітичної деградації аміноазобарвника метилоранжа (МО) під дією УФопромінення в нейтральному солевому електроліті з використанням каталізатора -титан (IV) оксиду нанодисперсної морфології зі структурою анатаза, синтезованого із суспензії гідратованого титан (IV) оксиду TiO(OH)2. Порівняно активність стандартних зразків (Р25 із співвідношенням фаз анатаз/рутил

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“…However, conventional TiO 2 NP suffer from the main limitation that is the wide energy bandgap (3.2 eV). This limited the usability of TiO 2 NP to UV irradiation < 400 nm [16]. Various attempts have been directed towards extending the applicability of TiO 2 NP to the higher wavelength range by lowering its bandgap [8,17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The persistence of fluoroquinolones (FQs) is well documented in various ecosystems [16,23,24]. Several studies demonstrated that wastewaters containing FQs are associated with serious health problems such as genotoxicity and carcinogenicity.…”

Section: Introductionmentioning

confidence: 99%

Energy-efficient carbon-doped titanium dioxide nanoparticles: synthesis, characterization, and catalytic properties under visible LED irradiation for degradation of gemifloxacin

2019

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Synthesis and characterization of energy-efficient visible-light-responsive carbon-doped titanium dioxide nanoparticles (C-TiO 2 NP) is reported. The characterization results of C-TiO 2 NP using BET, TEM, DLS, and XRD indicate the following: (1) the C-TiO 2 NP have high surface area (77.02 m 2 /g), (2) size range of 5.00-10.00 nm and (3) zeta potential of 19 (pH 4.0), 4 (pH 7.0) and −21 (pH 10.0) while (4) the XRD results shows a peak pattern indicating that C-TiO 2 NP is mostly in the anatase phase. The photocatalytic properties of C-TiO 2 NP is investigated in this study using gemifloxacin antibiotic under LED in the visible region (λ max ~ 450 nm). Results shows that C-TiO 2 NP have significant catalytic properties under LED visible light (up to ~ 74% within 60 min). On the other hand, no degradation is observed for control TiO 2 NP using LED visible light under equivalent experimental conditions. Using control TiO 2 NP with H 2 O 2 under LED visible light results in a percentage degradation of ~ 33.0%. Upon using C-TiO 2 NP with H 2 O 2 , the %degradation increases from ~ 33.0 to 64.0%. Although H 2 O 2 generally enhances the activity of bare TiO 2 NP under UV irradiation, the %degradation under LED in the presence of C-TiO 2 NP and H 2 O 2 (~ 64%) is smaller than that in the presence of C-TiO 2 NP only (~ 74%). Results demonstrates the applicability of C-TiO 2 NP as an energy-efficient and cost-effective photocatalyst under LED visible light for pharmaceutical wastewater treatment.

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Solar-light photocatalytic disinfection using crystalline/amorphous low energy bandgap reduced TiO2

Cited by 62 publications

References 36 publications

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

Understanding Surface Modulation to Improve the Photo/Electrocatalysts for Water Oxidation/Reduction

ФОТОEЛЕКТРОКАТАЛІТИЧНА ДЕГРАДАЦІЯ АМIНОАЗОБАРВНИКІВ ДІОКСИДОМ ТИТАНА З ПОВЕРХНЕВИМИ СТАНАМИ Ti3+

Energy-efficient carbon-doped titanium dioxide nanoparticles: synthesis, characterization, and catalytic properties under visible LED irradiation for degradation of gemifloxacin

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