Kinetics and mechanism of photocatalytic degradation of methyl orange in water by mesoporous Nd-TiO2-SBA-15 nanocatalyst

Bai, Liming; Wang, Shuo; Wang, Zhiyu; Hong, Enlv; Wang, Yu; Xia, Chunhui; Wang, Baiqi

doi:10.1016/j.envpol.2019.02.052

Cited by 70 publications

(15 citation statements)

References 60 publications

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“…This can be explained on the increase of catalyst dosage, total active surface area of catalyst increases hence more active sites are available on catalyst surface which resulted in increasing of hydroxyl radicals thus the number of degraded dye molecules increases [24,25]. However more addition of catalyst may not be useful in photodegradation of methyl orange dye because high dose of catalyst will establish turbidity suspension which cause inhibition in the penetration of visible light [26,27].…”

Section: Effect Of C-n-codoped Tio 2 Catalyst Dosagementioning

confidence: 99%

Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

et al. 2019

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T his work investigated the photodegradation of azo dye, methyl orange, without and with the addition of C-N-codoped TiO 2 catalyst using a visible halogen-lamp as a light source. C-Ncodoped TiO 2 was prepared by free-organic solvent peroxo sol-gel method. The effects of initial dye concentration, catalyst dosage, and pH solution on the photodegradation of methyl orange were studied. Photodegradation process for methyl orange solution at acidic condition showed high removal percentage. 5 mg L-1 methyl orange achieved color removal until 94% for 180 min irradiation in photodegradation process with the presence of C-N-codoped TiO 2 catalyst, and approximately 70% TOC removed as the results of mineralization process. The kinetics reaction rate of photodegradation of methyl orange dye with the addition of C-N-codoped TiO2 followed pseudo-first order represented by Langmuir-Hinshelwood model, the kinetics constant of photodegradation became higher by decreasing the initial concentration of methyl orange. Three organic byproducts of methyl orange formed during photodegradation process was identified by LC-MS/MS system then degradation pathway of methyl orange photodegradation in the presence of C-N-codoped TiO 2 catalyst was proposed.

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Section: Effect Of C-n-codoped Tio 2 Catalyst Dosagementioning

confidence: 99%

Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

et al. 2019

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“…After successive reactions, free radicals such as hydroxyl radicals (•OH) and the superoxide radicals (•O 2 -) are formed and used, as strong oxidizing agents producing the degradation of dye or pollutants. 53,54 TiO 2 + ℎ𝑣 → ℎ + + 𝑒 −…”

Section: Photocatalysismentioning

confidence: 99%

Development of photocatalysts based on TiO₂ films with embedded Ag nanoparticles

Roldán

Porta

Durán

et al. 2022

Int J of Appl Glass Sci

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In this work, the synthesis, characterization, and study of the photocatalytic activity of polycrystalline TiO 2 coatings with embedded Ag nanoparticles (Ag-TiO 2 ) were presented. In particular, the TiO 2 and Ag-TiO 2 coatings were developed using a simple and improved sol-gel technique. Very stable TiO 2 sols containing Ag nanoparticles were prepared and deposited by dip-coating process onto glass substrates obtaining homogeneous and transparent thin films. The well-distribution of silver nanoparticles into the TiO 2 sol allows TiO 2 coatings with Ag nanoparticles distributed throughout the volume of the material to be obtained. A significant improvement of the photocatalytic activity was observed for the Ag-TiO 2 coatings. The photocatalytic mechanism implicated in the dye degradation (methyl orange) by hydroxyl (•OH) and superoxide (•O 2 -) radicals was studied using several scavengers. Thus, it is concluded that the addition of Ag nanoparticles does not modify the mechanisms involved in the dye degradation, evidencing the good stability of the photocatalyst.

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“…According to this mechanism, most of the reactions occurring during the photodegradation of methyl orange can be explained by following equations (Liming Bai, et al 2019). The order of reaction was determined for CoN-TiO 2 -5 by plotting a graph between -ln C t /C o versus time and has been shown below in Fig.…”

Section: Mechanism Of Methyl Orange Degradationmentioning

confidence: 99%

Visible Light Active Nitrogen and Cobalt Co-doped TiO2 Nanoparticles: Synthesis, Characterization and Photocatalytic Activity

Javed

Qammar

Khurram

et al. 2021

Preprint

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A facile and room temperature approach to synthesize pure TiO2 and different variants of nirogen and cobalt co-doped TiO2 (CoN-TiO2) catalysts is reported in this study. The successful synthesis and crystalline phase analysis was carried out via X-ray diffraction (XRD) which confirmed anatase phase with tetragonal structure. The spherical morphology, uniform size distribution in the range of 20-40 nm and presence of dopants in final product were validated by scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDS). Diffused reflectance spectroscopy (DRS) is deployed for study of optical properties. A reduction in band gap from 3.2 eV for pure TiO2 nanoparticles to 2.34 eV for the 7 wt.%. doped CoN-TiO2 was observed. The photocatlytic activity of pure TiO2, and CoN-TiO2 nanoparticles was studied against methyl orange.The photocatlytic activity of CoN-TiO2 was almost double as compared to undoped TiO2 which proves these catalysts to be very efficient and potential candidate for the wastewater treatment at industrial level.

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Kinetics and mechanism of photocatalytic degradation of methyl orange in water by mesoporous Nd-TiO2-SBA-15 nanocatalyst

Cited by 70 publications

References 60 publications

Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

Development of photocatalysts based on TiO₂ films with embedded Ag nanoparticles

Visible Light Active Nitrogen and Cobalt Co-doped TiO2 Nanoparticles: Synthesis, Characterization and Photocatalytic Activity

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Kinetics and mechanism of photocatalytic degradation of methyl orange in water by mesoporous Nd-TiO2-SBA-15 nanocatalyst

Cited by 70 publications

References 60 publications

Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

Kinetics studies on photodegradation of methyl orange in the presence of C-N-codoped TiO2 catalyst

Development of photocatalysts based on TiO2 films with embedded Ag nanoparticles

Visible Light Active Nitrogen and Cobalt Co-doped TiO2 Nanoparticles: Synthesis, Characterization and Photocatalytic Activity

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Product

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Development of photocatalysts based on TiO₂ films with embedded Ag nanoparticles