Photocatalytic degradation of paraquat herbicide in the presence TiO 2 nanostructure thin films under visible and sun light irradiation using continuous flow photoreactor

Zahedi, Fatemeh; Behpour, Mohsen; Ghoreishi, Sayed Mehdi; Khalilian, Hajar

doi:10.1016/j.solener.2015.07.010

Cited by 62 publications

(23 citation statements)

References 43 publications

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“…This results is consisted with the results obtained by Sorrolla et al [3] who carried out photocatalytic experiments by 2 wt. % Cu-TiO2/SBA-15, but was a little lower than 84.39% estimated by Zahedi et al [10]. Higher removal of SiO 2 compared to N-TiO 2 /SiO 2 catalysts is due to higher adsorption capacity and surface area.…”

Section: Photocatalytic Experimentsmentioning

confidence: 62%

“…According to WHO, the maximum acceptable concentration for paraquat as dichloride in drinking water is 10 µgL Paraquat herbicide is known as high toxicity, so the removal of paraquat residue in wastewater is a necessary to protect water resource. Several methods of removal of herbicides in water including oxidation [8] processes, biopolymer membrane [9], absorption on porous materials [1,2], photocatalytic [3,5,10,11]. Among types of photocatalyst, TiO 2 is widely applied to remove organic pollutants as they are nontoxic, low cost and high-activity.…”

Section: Introductionmentioning

confidence: 99%

“…Among types of photocatalyst, TiO 2 is widely applied to remove organic pollutants as they are nontoxic, low cost and high-activity. Photocatalytic degradation of paraquat using TiO 2 under UV light has been studied [8,[10][11][12]. However, these studies have not investigated in degradation of paraquat under visible light.…”

Section: Introductionmentioning

confidence: 99%

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PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

Phương¹

2018

JST

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In the present paper, photocatalytic degradation of paraquat using N-TiO 2 /SiO 2 with different molar ratio of titanium: nitrogen (Ti:N) under visible light was investigated. The catalyst was prepared via immersed SiO 2 in N-TiO 2 . N-TiO 2 was synthesized by sol-gel method. The N-TiO 2 /SiO 2 catalyst was characterized using X-ray diffraction, UV diffuse reflectance spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy. The results from characterizations indicated that N-doped anatase TiO 2 had a 20-25 nm size. Degradation of paraquat, at an initial concentration of 10 mg/L was determined by UV-Vis. Chemical oxygen demand (COD) was used for process performance. Based on the COD tests, the COD values in residual paraquat was lower than that in initial paraquat concentration after 8 hours illumination of visible light. Moreover, the experiment's results indicated that 80% of paraquat was degraded within 8 h of illumination time. These results showed that N-TiO 2 /SiO 2 with molar Ti:N=2:1 gives the highest degradation efficiency of paraquat under visible light. This catalyst was stable and reusable suggesting it can be applied to treat organic pollutant in water.

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Section: Photocatalytic Experimentsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

Phương¹

2018

JST

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“…Titania thin film morphology plays an important role in capturing sunlight. The existence of different crystalline phases of TiO 2 will affect the effectiveness of photon energy absorption by TiO 2 thin film [6][7][8]. The photoactive TiO 2 crystalline phases cover the anatase and rutile phases with energy gap (Eg) respectively of 3.2 and 3.0 eV.…”

Section: Introductionmentioning

confidence: 99%

“…Different morphologies provide different and long adsorption capacities. The amount of organic pollutants adsorbed on the TiO 2 thin layer will affect the effectiveness of the interaction between h+ species or radical -OH and the persistent organic pollutants [7]. One application of titania film is as photocatalyst [10].…”

Section: Introductionmentioning

confidence: 99%

The effect of TiO₂thin film thickness on self-cleaning glass properties

Mufti

Laila

Hartatiek

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. TiO 2 is one of semiconductor materials which are widely used as photocatalyst in the form of a thin film. The TiO 2 thin film is prepared by using the spin coating sol-gel method. The researcher prepared TiO 2 thin film with 3 coating variations and X-Ray Diffraction characterization, UV-Vis Spectrophotometer, Electron Microscopy Scanning, and examined its hydrophilic and anti-fogging properties. The result of X-Ray Diffraction showed that the phase formed is the anatase on 101crystal field. The Electron Microscopy Scanning images showed that TiO 2 thin films had a homogeneous surface with the particle sizes as big as 235 nm, 179 nm, and 137 nm. The thickness of each thin film was 2.06 m  , 3.33 m  , and 5.20 m  . The characterization of UV-Vis Spectrophotometer showed that the greatest absorption to the wavelength of visible light was in the thin film's thickness of 3 coatings with the band-gap determined by using 3.30 eV, 3.33 eV, and 3.33 eV Plot Tuoc. These results indicated that the rate of absorption would be increased by increasing the thickness of film. The increasing thickness of the thin film makes the film hydrophilic able to be used as an anti-fogging substance.

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Solvent‐dependent mechanistic aspects for the redox reaction of paraquat in basic solution

Hou

Wang

2021

Int J of Quantum Chemistry

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Detailed mechanisms for the redox cycling of paraquat in basic solutions have been revealed computationally. The reduction of paraquat dication (PQ2+) undergoes via the successive additions with two hydroxide (OH−) anions to form the neutralized intermediates, which can decompose to generate the cation radical (PQ+) by releasing either OH or the hydrated O− radical. PQ+ is neutralized by one OH−, converting molecular oxygen into superoxide (O2−) anion to regenerate PQ2+. The reduction of PQ2+ by OH− is an energy‐directive process whereas the oxidation of PQ+ prefers an entropy‐driving path in which OH− acts as a catalyst. It is found that the Gibbs free‐energy reaction paths are strongly solvent dependent. The redox cycle is energetically preferable in the solvents with low dielectric constants. The yellow‐blue‐transparent color‐changing sequence in the clock reaction of paraquat has been understood by means of the electronic absorption spectra of the cations and the neutral intermediates. Atomic radical anion O− is predicted besides the known OH and O2− radicals to stimulate experimental studies on the redox chemistry of paraquat.

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Photocatalytic degradation of paraquat herbicide in the presence TiO 2 nanostructure thin films under visible and sun light irradiation using continuous flow photoreactor

Cited by 62 publications

References 43 publications

PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

The effect of TiO₂thin film thickness on self-cleaning glass properties

Solvent‐dependent mechanistic aspects for the redox reaction of paraquat in basic solution

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Photocatalytic degradation of paraquat herbicide in the presence TiO 2 nanostructure thin films under visible and sun light irradiation using continuous flow photoreactor

Cited by 62 publications

References 43 publications

PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

The effect of TiO2thin film thickness on self-cleaning glass properties

Solvent‐dependent mechanistic aspects for the redox reaction of paraquat in basic solution

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The effect of TiO₂thin film thickness on self-cleaning glass properties