Study of the photocatalytic activity of nanocrystalline S, N-codoped TiO2 thin films and powders under visible and sun light irradiation

Behpour, Mohsen; Atouf, Vajiheh

doi:10.1016/j.apsusc.2012.03.085

Cited by 63 publications

(21 citation statements)

References 39 publications

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“…It was found that MO solution was discolored completely under sun light in 75 min in the presence of the modified TiO 2 powder [138]. It was reported that sulphur doping can generate the small particle size with great surface area which accelerate the photodegradation process.…”

Section: Photocatalytic Activity Of Non Metal Doped Tio 2 Nmsmentioning

confidence: 98%

PHOTOCATALYTIC ACTIVITY OF TiO2 NANOMATERIAL

Jain

Vaya

2017

J. Chil. Chem. Soc.

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Nanomaterials synthesize by different techniques exhibit excellent photocatalytic activity. These catalysts could be employed for environmental remediation, renewable energy sources, photocatalysis and many other applications in various fields. Nanophotocatalyst has been used for the treatment of hazardous materials such as industrial effluents containing complex organic compounds, dyes and metal ions successfully. The multidimensional study of composition, shape, size, surface area and nanostructure and different operating parameters like pH, concentration, temperature etc, of these photocatalyst help in current and further development of photocatalysts for different applications . The photocatalytic activity of nanoparticles has made a great contribution in providing definitive mechanistic information about the photocatalytic processes.The main aim of this review paper is to give an overview of the enhanced photocatalytic activities of titanium dioxide (TiO 2 ) nanoparticles. This review includes the basic properties of photocatalyst and mechanim of photocatalysis process followed by unique photocatalytic properties and research of TiO 2 nanoparticles as photocatalysts. An effort has also been made to give an overview of expedient photocatalytic activity of these doped nanoparticles. Many investigators have reported the enhanced photocatalytic activity by the degradation of dyes as a model compound.Key Words: photocatalysts, TiO 2 , nanoparticles, AOPs. INTRODUCTIONToday, the industrial revolution is putting its negative impacts on the entire globe. Over the year's complexities, varieties and the amount of hazardous compounds are increasing in wastewater discharged by various printing, dyeing, textile and other chemical industries into the ecosystem. These compounds are highly carcinogenic and mutagenic. Apart from aesthetic pollution, they are causing eutrophication, high Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD). In addition to that, these compounds absorb sunlight strongly which affects the photosynthetic activity of aquatic plants and seriously threatening the whole ecosystem [1,2]. Now days the perilous effects of organic dyes to the environment is a particular concern. To resolve this problem, the photocatalytic decomposition processes are being employed by many researchers to degrade the organic pollutants of industrial wastewater before discharge into receiving media [3]. Although various chemical and physical process are available for the degradation of textile effluents but they generate non-biodegradable contaminations and further require treatment involving expensive procedure. Conventional techniques such as coagulation/ flocculation, membrane separation, absorption methods as well as biological methods are also inefficient for removal of complex organic compounds [4][5][6][7][8][9][10][11]. To resolve such types of problems Advanced Oxidation Processes (AOPs) are proven to be most promising technique which is based on the generation of highly reactive hydroxyl radica...

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Section: Photocatalytic Activity Of Non Metal Doped Tio 2 Nmsmentioning

confidence: 98%

PHOTOCATALYTIC ACTIVITY OF TiO2 NANOMATERIAL

Jain

Vaya

2017

J. Chil. Chem. Soc.

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“…Thiourea (Tu: CH 4 SN 2 , as a precursor of nitrogen and sulfur) can transfer the photocatalytic activity of TiO 2 to visible region due to synergetic effect by S and N. Thus, after few minutes, while stirring solution, 0.25 g Tu (to make 0.45 M ratio of Tu:TiO 2 ) was dissolved into the TiO 2 sol under vigorous stirring. The molar ratio 0.45 was selected based upon our previous work which highest photodecomposition efficiency was reported (Behpour and Atouf, 2012). Finally, the obtained yellow solution was stirred continuously for 2 h at room temperature until it forms homogeneous solution.…”

Section: Synthesis Of N S/tiomentioning

confidence: 99%

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

et al. 2015

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“…TiO 2 was prepared by sol-gel as mentioned elsewhere [4]. Briefly, the sols were synthesized by adding acetylacetone (acac) ethanol and tetra butyl orthotitanate (TBOT) in acidic conditions at a ratio of 2.5:10:2.5 (acac : ethanol : TBOT).…”

Section: Preparation Of Tio 2 Precursor Solmentioning

confidence: 99%

“…All of the samples contained a 100 mL solution of CV dye or blank and pH was adjusted by adding diluted HClO 4 or NaOH. A fresh CV dye solution, with known concentration and adjusted pH, was poured into a reservoir with continuous stirring.…”

Section: Experimental Design and Photocatalytic Degradation Proceduresmentioning

confidence: 99%

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Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Khalilian¹,

Semnani²,

Nekoeinia³

2018

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, optimisation of the photocatalytic behaviour of crystal violet (CV) by thiourea (Tu)-codoped TiO2 thin film in fixed bed photoreactor was investigated by central composite designs (CCDs). The effective variables were pH, the concentration of CV dye, flow rate and reaction time. The results of the CCD model showed a good agreement with experimental results, with R 2 = 0.9680 (p < 0.0001) and maximum degradation efficiency was obtained at the optimum conditions: dye concentration 8.5 mg/L, pH 9, flow rate 6 mL/min and reaction time 80 min. Subsequently, three absorbing chemical compounds presented in the degradation reaction were obtained by using singular value decomposition (SVD) method and evolving factor analysis (EFA). Then a multivariate curve resolution with alternating least squares (MCR-ALS) was performed to achieve the concentration and spectral profiles for each component. Finally, a hard modelling method was applied to determine the kinetic constants of distinct reactions occurred in the photocatalytic degradation process. The reaction rate constants were calculated for the first and second steps as k1 = 0.08327 (SD = ±0.0015) /min and k2 = 0.045 (SD = ±0.0006)/min, respectively.

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Study of the photocatalytic activity of nanocrystalline S, N-codoped TiO2 thin films and powders under visible and sun light irradiation

Cited by 63 publications

References 39 publications

PHOTOCATALYTIC ACTIVITY OF TiO2 NANOMATERIAL

PHOTOCATALYTIC ACTIVITY OF TiO2 NANOMATERIAL

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

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

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