Photocatalytic Decolorization of Dye with Self-Dye-Sensitization under Fluorescent Light Irradiation

Molla, Md. Ashraful Islam; Tateishi, Ikki; Furukawa, Mai; Katsumata, Hideyuki; Suzuki, Tohru; Kaneco, Satoshi

doi:10.3390/chemengineering1020008

Cited by 28 publications

(15 citation statements)

References 29 publications

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“…Aqueous fenitrothion solutions are prepared with ultrapure water, which is produced by an ultrapure water system (Advantec MFS, Inc., Tokyo, Japan) showing in a resistivity >18 MΩ cm. A 30 mL aqueous solution containing 10 mg/L fenitrothion is put into a Pyrex reaction vessel (50 mL capacity).TiO2 powder is purchased from Degussa Co., Germany and its physical data are as follows: particle size ~21 nm, surface area 50 m 2 /g, band gap 3.2 eV, purity 99.9% and with 80: 20 anatase to rutile [13].The catalyst powder (30 mg) is added to the solution to produce a concentration of 1 g/L. The pH of the solution is 6.0.…”

Section: Methodsmentioning

confidence: 99%

PHOTOCATALYTIC DEGRADATION OF FENITROTHION IN WATER WITH TiO2 UNDER SOLAR IRRADIATION

Molla¹,

Furukawa²,

Tateishi³

et al. 2018

Water conserv. manag.

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Fenitrothion is widely used as herbicide with strong estrogenic activity, and it can lead to abnormalities of the thyroid gland and can give mutations. Hence, their degradation treatment is necessary for the environment. The photocatalytic remediation under sunlight irradiation is very effective for the degradation of fenitrothion. Fenitrothion is completely degraded during 10 min under the optimized conditions. The influence of various conditions, such as irradiation time, sunlight intensity, pH, temperature, TiO2 loading amount and initial substrate concentration, is investigated on the degradation of fenitrothion. The photocatalytic degradation mechanisms are speculated, from the experimental results with molecular orbital (MO) simulation for frontier electron density. The primary photocatalytic degradation reaction keeps a pseudo first order kinetic law. The activation energy (Ea) and half-life (t1/2) are 20.6 kJ/mol and 1.4 min, respectively. The fenitrothion wastewater photocatalytic treatment may become a good technique under solar irradiation.

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Section: Methodsmentioning

confidence: 99%

PHOTOCATALYTIC DEGRADATION OF FENITROTHION IN WATER WITH TiO2 UNDER SOLAR IRRADIATION

Molla¹,

Furukawa²,

Tateishi³

et al. 2018

Water conserv. manag.

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“…The photosensitization of organic dye molecules is an important step for starting the photocatalytic reaction because the dye molecule can provide the electron to sepiolite through the photo-irradiation process [58][59][60][61]. In the case of RhB degradation over sepiolite under the visible light irradiation, the electron in the pristine sepiolite could not be excited under the visible light due to the wide energy band gap (Eg = 3.7 eV, Figure 5b).…”

Section: Mechanism Of Organic Dye Degradation Over Sepiolitementioning

confidence: 99%

Dye-sensitized Photocatalyst of Sepiolite for Organic Dye Degradation

2019

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The photocatalytic activity of sepiolite was examined for degradation of several dye compounds under visible light irradiation. Higher adsorption capacities and greater photocatalytic performance of cationic dyes (rhodamine B and methylene blue) were observed on sepiolite, in comparison with anionic dyes (orange II and trypan blue). Superiority in the photocatalytic activity of cationic dyes is attributed to the strong electrostatic attraction and photosensitization properties of cationic dye molecules. Sepiolite has degraded 45.3% rhodamine B within 120 min, which is the greatest photocatalytic degradation efficiency when compared with other dyes. Subsequently, the reusability of spent sepiolite after adsorption of rhodamine B was evaluated by the degradation of trypan blue under the visible light irradiation. The photocatalytic degradation performance of trypan blue by spent sepiolite after adsorption of rhodamine B increased about twice as much as with pristine sepiolite, indicating that the dye-sensitized photocatalytic process could enhance the photocatalytic degradation ability of sepiolite. Through radical scavenger tests, it was found that a superoxide radical is mainly responsible for rhodamine B degradation. The possible mechanism of rhodamine B degradation under visible light irradiation was proposed. The sepiolite could be a potential catalyst for the degradation of organic pollutants in wastewater under solar light.

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“…Thus, the synthesis of advanced semiconductor materials with valuable photocatalytic properties is continuously generating new catalysts for driving a variety of reactions more efficiently [9,10]. The produced new catalysts are often tested against a specific reaction such as the degradation kinetics of a dye, resulting in works that claim to have improved the photocatalytic efficiency (or enhanced the activity) of the process relative to previous materials, modified stoichiometric ratios, variable geometries, or single components integrated into nanocomposite heterostructures [11,12]. However, such measurements are insufficient to report photocatalytic activities because they lack a mechanism to account for the number of photons driving the process [13,14].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity: Experimental Features to Report in Heterogeneous Photocatalysis

Hoque

Guzmán

2018

Materials

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Heterogeneous photocatalysis is a prominent area of research with major applications in solar energy conversion, air pollution mitigation, and removal of contaminants from water. A large number of scientific papers related to the photocatalysis field and its environmental applications are published in different journals specializing in materials and nanomaterials. However, many problems exist in the conception of papers by authors unfamiliar with standard characterization methods of photocatalysts as well as with the procedures needed to determine photocatalytic activities based on the determination of “apparent quantum efficiencies” within a wavelength interval or “apparent quantum yields” in the case of using monochromatic light. In this regard, an astonishing number of recent research articles include claims of highly efficient (photo)catalysts or similar terms about materials with superior or enhanced efficiency for a given reaction without proper experimental support. Consequently, the comparison of the efficiencies of photocatalysts may result as being meaningless, especially when reports are only based on expressions determining (1) a reaction rate per weight of catalyst or its surface area, (2) quantum efficiencies or quantum yields, and (3) turnover frequencies or turnover numbers. Herein, we summarize the standards needed for reporting valuable data in photocatalysis and highlight some common discrepancies found in the literature. This work should inform researchers interested in reporting photocatalysis projects about the correct procedures for collecting experimental data and properly characterizing the materials by providing examples and key supporting literature.

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Photocatalytic Decolorization of Dye with Self-Dye-Sensitization under Fluorescent Light Irradiation

Cited by 28 publications

References 29 publications

PHOTOCATALYTIC DEGRADATION OF FENITROTHION IN WATER WITH TiO2 UNDER SOLAR IRRADIATION

PHOTOCATALYTIC DEGRADATION OF FENITROTHION IN WATER WITH TiO2 UNDER SOLAR IRRADIATION

Dye-sensitized Photocatalyst of Sepiolite for Organic Dye Degradation

Photocatalytic Activity: Experimental Features to Report in Heterogeneous Photocatalysis

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