Efficient decomposition of organic compounds and reaction mechanism with BiOI photocatalyst under visible light irradiation

Li, Yongyu; Wang, Jianshe; Yao, Hong-Chang; Dang, Liyun; Li, Zhongjun

doi:10.1016/j.molcata.2010.11.005

Cited by 320 publications

(146 citation statements)

References 39 publications

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“…Moreover, the catalyst was found to be active after storage for 110 days and observing the same activity as the fresh catalyst. A peroxidase-like mechanism was proposed based on quenching experiments using p-benzoquinone as O 2 ·À scavenger [37] and tert-butanol as · OH scavenger. [38] The decrease in the MB degradation in the presence of tert-butanol was 22 % while a 45.6 % decrease was observed when p-benzoquinone was introduced in the reaction medium.…”

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confidence: 99%

Metal Nanoparticles as Heterogeneous Fenton Catalysts

et al. 2012

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The Fenton reaction (the generation of hydroxyl radicals from hydrogen peroxide) is the most useful method for degradation of organic pollutants in aqueous solution at moderate concentrations. In this Review we summarize the use of metal nanoparticles, either unsupported or deposited on large-surface-area solids, as Fenton catalysts. The Review complements two other reviews in the field of heterogeneous Fenton catalysis using aluminosilicates and carbonaceous materials. Herein, particular emphasis is given to the reaction conditions in which these catalysts are used, highlighting the operating mechanism and the relative efficiency of the materials. Aspects such as leaching of the metal to the solution, reusability, and the concentration of hydrogen peroxide used are analyzed in detail. Besides a critical description of the present status of the field, future trends and the need to establishing valid comparisons to assess the relative efficiencies of the materials are commented on.

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confidence: 99%

Metal Nanoparticles as Heterogeneous Fenton Catalysts

et al. 2012

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“…Materials. Chemicals Ti(OBu) 4 , Sr(NO 3 ) 2 ⋅6H 2 O, KNO 3 , ethanol, ethylene glycol, anhydrous acetic acid, butyl acrylate, ethylene glycol dimethacrylate, sulfonated polystyrene, 2-hydroxy-2-methylpropiophenone, dopamine, and glycerol were purchased from Sigma-Aldrich.…”

Section: Methodsmentioning

confidence: 99%

“…There are several technologies adopted to remove MB in water like biological degradation, adsorption, Fenton's reagent method, coagulation processes, photocatalytic decomposition, and so on [3]. Among these, photocatalytic method to degrade these pollutants is the most desirable as no second pollutants are generated in this process [4]. SrTiO 3 has been an attractive catalyst for organics degradation under UV light [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photodecomposition of Methylene Blue in Water with Sr_1−xK_xTiO_3−δ@PC-polyHIPEs under UV and Visible Light

Gao

Zhang

Guo

et al. 2018

Journal of Chemistry

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Photocatalytic method was investigated to remove water pollutant methylene blue (MB) produced in textile, plastic, and dye industries. PC-polyHIPEs were prepared by light-induced polymerization of dopamine in transparent polyHIPEs which were synthesized by polymerization within high internal phase emulsions. Sr 1− K TiO 3− ( = 0-0.5) nanoparticles were incorporated and adhered to PC-polyHIPEs to form Sr 1− K TiO 3− @PC-polyHIPEs for the first time. The catalysts were characterized by XRD, FTIR, TGA, UV-Vis DRS, and SEM and their photocatalytic properties for MB decomposition were measured over UV-Vis spectrometer. The PC-polyHIPEs were of interconnected porous structure with around 100 m pores and 30 m windows. Sr 1−x K x TiO 3− @PC-polyHIPEs showed excellent MB decomposition activity under either UV or visible light although Sr 1−x K x TiO 3− alone worked only under UV light. When = 0.3, Sr 1−x K x TiO 3− @PC-polyHIPEs showed the highest photocatalytic performance due to the existence of more oxygen vacancies. When the water solution with 50 mg L −1 MB and 1.6 g cat. L −1Sr 0.7 K 0.3 TiO 3− @PC-polyHIPEs was exposed to visible light for 160 min at room temperature, 88.3% of MB was decomposed. After being used for eight cycles, 87.6% activity of fresh Sr 0.7 K 0.3 TiO 3− @PC-polyHIPEs still remained. The influences of salinity, temperature, and catalyst concentration on the catalytic activity were studied. For MB decomposition under visible light, the activation energy of Sr 0.7 K 0.3 TiO 3− @PC-polyHIPEs was calculated to be 12.3 kJ mol −1 and the kinetics analysis revealed that the photocatalysis followed the second-order reaction. These findings demonstrated that Sr 1−x K x TiO 3− @PC-polyHIPEs were an effective candidate for real application in decomposition of MB in water.

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“…1 g L -1 of the catalyst powders was used in the PC oxidation of 5 ppm of MO (pH = 6.8) during 60 min, employing constant air bubbling and agitation. To evaluate the effect of the OH * and O 2 * radical scavengers, 80 mM of tert-butanol and 1 mM of benzoquinone were added to the initial solution [34].…”

Section: Photocatalytic (Pc) and Photoelectrocatalytic (Pec) Degradatmentioning

confidence: 99%

“…This indicates that O 2 *-radicals, which are formed by reduction of dissolved O 2 in the solution (provided by constant air bubbling) with the photogenerated electrons, are the only species involved in the TiO 2 -T degradation mechanism [34]. On the other hand, for the TiO 2 -TNF photocatalyst, a similar change in the MO concentration with time was observed when each radical scavenger was absent, indicating that MO degradation on this material is conducted by a joint mechanism involving O 2 *-and OH * radical generation.…”

Section: Photocatalytic Performancementioning

confidence: 99%

Directing photocatalytic and photoelectrocatalytic performance of TiO2 by using TEA and NH4F as doping precursors

Castellanos-Leal

Acevedo–Peña

Lartundo-Rojas

et al. 2016

J Sol-Gel Sci Technol

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Triethylamine (TEA) and NH 4 F-modified TiO 2 powders and thin films were prepared by combining solgel and hydrothermal processes. Modification with TEA results in increased specific surface area and induces energy states below the conduction band of TiO 2 . On the other hand, the use of NH 4 F decreases the band-gap, displacing the valence band. Employing radical-scavenging agents, it was found that formation of O 2 * is preferred in TEA-modified TiO 2 , whereas generation of both O 2 * and OH * results from simultaneous modification. Furthermore, the photocatalytic degradation rate was directly proportional to their specific surface area. However, this trend was reversed in a photoelectrocatalytic cell, due to the fact that the photogenerated electrons are rapidly transported to the rear contact, which restrains their transfer to the dissolved oxygen to generate O 2 * . Therefore, the presence of OH * radicals and direct charge transfer processes appears to play a key role in the photoelectrocatalytic process. Graphical Abstract

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Efficient decomposition of organic compounds and reaction mechanism with BiOI photocatalyst under visible light irradiation

Cited by 320 publications

References 39 publications

Metal Nanoparticles as Heterogeneous Fenton Catalysts

Metal Nanoparticles as Heterogeneous Fenton Catalysts

Enhanced Photodecomposition of Methylene Blue in Water with Sr_1−xK_xTiO_3−δ@PC-polyHIPEs under UV and Visible Light

Directing photocatalytic and photoelectrocatalytic performance of TiO2 by using TEA and NH4F as doping precursors

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Efficient decomposition of organic compounds and reaction mechanism with BiOI photocatalyst under visible light irradiation

Cited by 320 publications

References 39 publications

Metal Nanoparticles as Heterogeneous Fenton Catalysts

Metal Nanoparticles as Heterogeneous Fenton Catalysts

Enhanced Photodecomposition of Methylene Blue in Water with Sr1−xKxTiO3−δ@PC-polyHIPEs under UV and Visible Light

Directing photocatalytic and photoelectrocatalytic performance of TiO2 by using TEA and NH4F as doping precursors

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Enhanced Photodecomposition of Methylene Blue in Water with Sr_1−xK_xTiO_3−δ@PC-polyHIPEs under UV and Visible Light