Sunlight photocatalytic activity of polypyrrole–TiO2 nanocomposites prepared by ‘in situ’ method

Wang, Desong; Wang, Yanhong; Li, Xueyan; Luo, Qingzhi; An, Jing; Jian-xia, Yue

doi:10.1016/j.catcom.2007.10.027

Cited by 198 publications

(82 citation statements)

References 28 publications

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“…Lots of investigations reported that 10-12% of dyes are used every year in textile industries such as Rose Bengal, Victoria blue, Thymol blue, Caramine, Indigo Red, Red 120, Rhodamine B, Methylene Blue, Eriochrome Black-T (EBT) [1][2][3][4] of which are major portion (20%) lost during synthesis and processing operations, which enter into water through effluents. The wastewater released from industries contains highly hazardous and coloured pigments which causes serious ill effect on aquatic life and also human beings [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Kumar

Gajanan

ey³

2017

MSEIJ

179

104

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The oxidation rates and efficiency of the photocatalytic system are highly dependent on a number of operational parameters that govern the photodegradation of the organic molecule. Several study have been reported the significance of operational parameter. The photodegradation depends on the some basic parameters which are concentration of substrate, amount of photocatalyst, pH of the solution, temperature of reaction medium, time of irradiation of light, the intensity of light, surface area of photocatalyst, dissolve oxygen in the reaction medium, nature of the photocatalyst, nature of the substrate, doping of metal ions and non metal and structure of photocatalyst and substrate. The photodegradation of organic compound have been studied by the several scientists and conclude the optimum conditions for the photodegradation of organic compound.The photodegradation of organic compounds was found maximum at low concentration of organic substrate with optimum amount of photocatalyst. The pH of the solution is also affect the photodegradation of organic substrate. The Titania show the maximum adsorption at low pH hence the photodegradation also found maximum at low pH. The surface area is the crucial factor for the photodegradation of organic substrate. If we are increasing the surface area of photocatalyst, the photodegradation of organic substrate increase. This is because that the number of active site increased with increasing the surface area. The amount of photocatalyst is the primary requirement of any photocatalysis process. The amount of photocatalyst should be optimum, if we take the high amount of photocatalyst the photodegradation is decreased, if we take the low amount of photocatalyst the photodegradation also decreased. The doping of metal ions and non-metal ions affect the photodegradation of organic substrate. Therefore, we have to use the metal ions which increased the positive charge on the surface of photocatalyst. The temperature and irradiation of light also affect the photodegradation of organic substrate. For the maximum photodegradation, the photocatalytic reaction should perform at room temperature not greater than 80 °C. The light of irradiation should be used which exit the electron easily from valence band to conduction band or equal to band gap energy. Keywords: A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials 2/10Copyright: ©2017 Kumar et al. for the removal of pollutants at high concentrations. The biological treatments are very slow, dispose large amount of sludge and required strict control of proper pH and temperature [21]. In this regard photo catalytic processes have advantages for the removal of pollutants even at low concentration for industrial waste water [22]. Moreover in photo oxidation, complete oxidation of organic pollutants take place within few hours, even at ppb level, without formation of secondary hazardous products using highly active and cheap catalysts which can be used in specially design reactor systems [23].Ti...

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Section: Introductionmentioning

confidence: 99%

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Kumar

Gajanan

ey³

2017

MSEIJ

179

104

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“…Simple operation and mild reaction conditions are required. Wang and co-workers [21] used in situ polymerization to modify TiO 2 with PPy. The resulting TiO 2 /PPy (core/shell) had higher photoactivity under irradiation than TiO 2 modified with methyl orange.…”

Section: −1mentioning

confidence: 99%

Application of Conducting Polymers in Solar Water-Splitting Catalysis

Alsultan

Ranjbar

Swiegers

et al. 2016

Industrial Applications for Intelligent Polymers and Coatings

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Water splitting is the general term for a chemical reaction in which water is separated into its constituent materials, oxygen and hydrogen. Hydrogen is widely considered to be an ideal fuel of the future due to its potential to replace fossil fuels. The key to an energy-efficient water-splitting process lies in catalysts that can carry out the water oxidation and reduction reactions with minimal energy losses. Conducting polymers are attractive materials for this technology and application because they may combine several desirable properties, including electronic conduction, ionic conduction, sensor functionality, and electrochromism. In this chapter, water splitting assisted by or driven by illumination with sunlight and involving conducting polymers is reviewed. The properties of conducting polymers that make them favorable for this purpose are also discussed. Comparisons of these properties with those of conventional water-splitting materials are made. Finally, a statement of research and achievements of solar hydrogen production through water splitting using conductive polymers will be reported.

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“…The resulting radicals are powerful enough to decompose oxidize RhB to the degradation products. The whole process can be clearly described as shown by Equation (12) and Figure 13 ( [16,34] …”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Synthesis of molecularly imprinted polypyrrole/titanium dioxide nanocomposites and its selective photocatalytic degradation of rhodamine B under visible light irradiation

He¹,

Bao²,

Sun³

et al. 2014

Express Polym. Lett.

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Abstract. Highly selective molecularly imprinted nanocomposites MIP RhB -PPy/TiO 2 were successfully prepared by surface molecular imprinting technique with rhodamine B (RhB) as template molecule. The prepared MIP RhB -PPy/TiO 2 coated with a thin imprinted layer could respond to visible light. The static and dynamic binding experiments revealed that MIP RhB -PPy/TiO 2 possessed strong affinity, high adsorption capacity and fast adsorption rate for RhB. The selectivity experiments indicated that MIP RhB -PPy/TiO 2 had excellent recognition selectivity for RhB. Selective photocatalytic degradation experiments indicated that the apparent rate constant (k) for the photodegradation of RhB over MIP RhB -PPy/TiO 2 is 0.0158 min -1 , being 3.6 times of that over non-imprinted nanocomposites NIP-PPy/TiO 2 (0.0044 min -1 ). Compared with the NIP-PPy/TiO 2 , MIP RhB -PPy/TiO 2 showed higher photocatalytic selectivity toward RhB under visible light, which was attributed the introduction of the imprinted cavities on the surface of MIP RhB -PPy/TiO 2 . Moreover, MIP RhB -PPy/TiO 2 exhibited high reusability and stability. The results indicate that molecularly imprinted nanocomposites MIP RhB -PPy/TiO 2 have a promising perspective in industrial wastewater treatment.

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Sunlight photocatalytic activity of polypyrrole–TiO2 nanocomposites prepared by ‘in situ’ method

Cited by 198 publications

References 28 publications

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Application of Conducting Polymers in Solar Water-Splitting Catalysis

Synthesis of molecularly imprinted polypyrrole/titanium dioxide nanocomposites and its selective photocatalytic degradation of rhodamine B under visible light irradiation

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