Photodegradation of methylene blue in water, a standard method to determine the activity of photocatalytic coatings?

Tschirch, Jessica; Dillert, Ralf; Bahnemann, Detlef W.; Proft, Bernd; Biedermann, Andreas; Goer, B.

doi:10.1163/156856708784040588

Cited by 90 publications

(49 citation statements)

References 10 publications

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“…In other words, by increasing the lifetime of the electronhole pairs, the photocatalytic efficiency of the ZnO-PANI system is also increased. The photocatalytic degradation pathway of methylene blue under UV or visible light irradiation because of the generation of reactive hydroxy and hydroperoxy radicals has been proposed [28][29][30]. Hydroxy and hydroperoxy radicals produced by the action of photocatalyst are capable of oxidizing MB molecules at the surface layer of photocatalyst.…”

Section: Effect Of Photocatalyst Loadingmentioning

confidence: 99%

Preparation, characterization, and photocatalytic activity of polyaniline/ZnO nanocomposite

Olad

Nosrati

2011

Res Chem Intermed

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Polyaniline (PANI)/zinc oxide (ZnO) nanocomposite was synthesized by in-situ polymerization. X-ray diffraction patterns, UV-visible spectroscopy, SEM, and TEM were used to characterize the composition and structure of the nanocomposite. Nanostructured PANI/ZnO composite was used as photocatalyst in the photodegradation of methylene blue dye molecules in aqueous solution. The photocatalytic activity of PANI/ZnO nanocomposite under UV and visible light irradiation was evaluated and was compared with that of ZnO nanoparticles. ZnO/ PANI core-shell nanocomposite had greater photocatalytic activity than ZnO nanoparticles and pristine PANI under visible light irradiation. According to these results, application of PANI as a shell on the surface of ZnO nanoparticles causes the enhanced photocatalytic activity of the PANI/ZnO nanocomposite. Also UVvisible spectroscopy studies showed that the absorption peak for PANI/ZnO nanocomposite has a red shift toward visible wavelengths compared with the ZnO nanoparticles and pristine PANI. The effect of different operating conditions on the photocatalytic performance of PANI/ZnO nanocomposite in the photodegradation of methylene blue dye molecules was investigated in a bath experimental setup.

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Section: Effect Of Photocatalyst Loadingmentioning

confidence: 99%

Preparation, characterization, and photocatalytic activity of polyaniline/ZnO nanocomposite

Olad

Nosrati

2011

Res Chem Intermed

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“…[23,24] Ultraviolet source was a 6 W Hg lamp (Philips) with a maximum emission at approximately 254 nm. In a typical process, two samples, tungsten oxide thin film before and after the annealing process were settled into the vessels containing 20 ml MB aqueous solution with an initial concentration of 2 ppm and then it was kept in a dark place for 60 min to equilibrate the adsorption-desorption processes.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity

Azimirad

Khosravi

Moshfegh

2011

Surface & Interface Analysis

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A simple method for synthesis of W 17 O 47 nanothick plates by annealing sol-gel-deposited tungsten oxide thin films on soda lime substrate has been reported. After heat treatment of the dried thin films at 700• C in N 2 ambient for 60 min, W 17 O 47 nanothick plates with [100] orientation were obtained. The synthesized product was characterized and analyzed by, X-ray diffraction (XRD), SEM, XPS and ultraviolet-visible spectrophotometery. According to SEM observations, nanothick plates grew with random orientations on the surface. In addition, it was observed that some of the nanothick plates were constituted from several nanosheets. XRD analysis determined that the nanothick plates were mainly composed of monoclinic W 17 O 47 phase with strong (500) diffraction peak and about 50 nm average crystalline size. Basing on XPS analysis, the surface composition of the nanothick plates was determined WO 2.78 . It was found that the 60 min annealed sample has the maximum number of nanothick plates per unit area over the surface as compared to the samples annealed for 15, 45 and 80 min. In addition, the photocatalytic degradation of methylene blue over this sample exhibited the highest photoactivity rate. A mechanism for photocatalytic activity of the W 17 O 47 nanothick plates was also proposed.

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“…Based on previous reports, the photocatalytic degradation of MB under UV or visible light irradiation is mainly related to the generation of reactive hydroxy and hydroperoxy radicals [28][29][30]. The hydroxy and hydroperoxy radicals produced by the action of photocatalyst are capable of oxidizing MB molecules at the surface layer of photocatalyst.…”

Section: Mechanismmentioning

confidence: 99%

Activated Charcoal Supported Cadmium Doped TiO<sub>2</sub> for Photocatalytic and Antibacterial Applications

Prabha

Chandraboss

Kamalakannan

et al. 2015

ILCPA

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The photocatalytic activity was studied under UV light using AC-Cd/TiO 2 prepared via precipitation method and characterized by powder X-ray diffraction (XRD) , high resolution scanning electron micrographs (HR-SEM) with energy dispersive X-ray analysis (EDX), photoluminescence (PL) and Fourier transform Raman analysis (FT-RAMAN). The enhanced photo catalytic activity of the AC-Cd/TiO 2 is demonstrated through photodegradation of methylene blue under UV light radiation at 365 nm. The mechanism of photocatalytic effect of AC-Cd/TiO 2 Nano composite material has been discussed Further its antibacterial activity against two gram positive and two gram negative bacterial strain is studied.

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Photodegradation of methylene blue in water, a standard method to determine the activity of photocatalytic coatings?

Cited by 90 publications

References 10 publications

Preparation, characterization, and photocatalytic activity of polyaniline/ZnO nanocomposite

Preparation, characterization, and photocatalytic activity of polyaniline/ZnO nanocomposite

Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity

Activated Charcoal Supported Cadmium Doped TiO<sub>2</sub> for Photocatalytic and Antibacterial Applications

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Photodegradation of methylene blue in water, a standard method to determine the activity of photocatalytic coatings?

Cited by 90 publications

References 10 publications

Preparation, characterization, and photocatalytic activity of polyaniline/ZnO nanocomposite

Preparation, characterization, and photocatalytic activity of polyaniline/ZnO nanocomposite

Synthesis of W17O47 nanothick plates with preferred orientation and their photocatalytic activity

Activated Charcoal Supported Cadmium Doped TiO<sub>2</sub> for Photocatalytic and Antibacterial Applications

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Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity