A study on deactivation and regeneration of titanium dioxide during photocatalytic degradation of phthalic acid

Gandhi, Vimal; Mishra, Manish; Joshi, Pradyuman A.

doi:10.1016/j.jiec.2012.05.001

Cited by 55 publications

(19 citation statements)

References 24 publications

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“…The increase in a values for both buffers (Fig. 6) suggests that substrate affinity for the TiO 2 surface may play some part in these changes (possibly due to change in surface charge [53] ), although it does not explain why the buffers have opposite effects. Only in the case of acetate buffer use do we see a significant value of k 2 , which suggests that this buffer promotes intermediate degradation (which is otherwise discouraged at this pH).…”

Section: Effect Of Phmentioning

confidence: 94%

“…[56] Phthalate may be stabilized on the surface by p-interactions [57] or bidentate binding, [58] and has previously been shown to deactivate TiO 2 by immobilization on the surface, even under UV irradiation. [53] This may Table 3. Table 3) k 1 is the effective rate coefficient for the degradation of the dye, k 2 the effective rate coefficient for the degradation of the intermediate explain why the phthalate-buffered TiO 2 system is less reactive towards both dye (k 1 ) and intermediate (k 2 ) degradation than the carboxylic acid-buffered one.…”

Section: Effect Of Phmentioning

confidence: 99%

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Investigation of the Photodegradation of Reactive Blue 19 on P-25 Titanium Dioxide: Effect of Experimental Parameters

et al. 2015

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The photocatalytic decolorization and degradation of an anthraquinone-based reactive dye, C.I. Reactive Blue 19, was carried out in laboratory-scale experiments with the systematic variation of several operational parameters, including electron acceptor (hydrogen peroxide) concentration, initial pH, use of buffer solution, aeration, and the specific chemical nature of the buffer solution. Photodegradation was performed under simulated natural light, and conditions were chosen to mimic those found in industry. Mineralization and decolorization were monitored by UV-vis spectroscopy and total organic carbon analysis, and kinetics were modelled using an in-series first-order combination mechanism. Reaction products were examined and monitored by high-resolution mass spectrometry. Under the conditions explored, the reaction rate was found to depend not only on pH and electron acceptor concentration, but also on the specific chemical nature of the buffer used.

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Section: Effect Of Phmentioning

confidence: 94%

Section: Effect Of Phmentioning

confidence: 99%

Investigation of the Photodegradation of Reactive Blue 19 on P-25 Titanium Dioxide: Effect of Experimental Parameters

et al. 2015

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“…Catalyst deactivation is mainly caused by water deposition and the accumulation of intermediates on the surface of catalysts (Gandhi et al, 2012). It may be solved by hydrophobic catalysts (Zhao and Lu, 1998;Kuwahara et al, 2009) and by metal doping on the catalysts to improve the rate of mineralization and oxidation ability (Qi and Yang, 2004;Wang et al, 2012;Yang et al, 2014).…”

Section: Outlooks In Vuv-based Processes For Air Pollutants Degradationmentioning

confidence: 99%

Recent Development of VUV-Based Processes for Air Pollutant Degradation

Huang

et al. 2016

Front. Environ. Sci.

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As air pollution poses a great challenge around the globe, it is essential to fashion out a way of efficiently degrading the air pollutants. Vacuum Ultraviolet (VUV)-based processes are an emerging and promising technology for environmental remediation such as air cleaning, wastewater treatment, and air/water disinfection. When VUV irradiation, photolysis, photocatalysis, and ozone-assisted oxidation are involved at the same time, it results in the fast degradation of air pollutants because of their strong oxidizing capacity. The mechanisms of how the oxidants are produced and how they react are discussed in this review. This paper focuses mainly on the three VUV-based oxidation processes including VUV photolysis, VUV combined with ozone-assisted oxidation, and VUV-PCO with emphasis on their mechanisms and applications. Also, the outlook of these processes are proposed in this paper.

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“…This is a commonly used method for doping and can transform an inhibitor 13 such as Mn 2+ into a promoter [148]. 14 The regeneration P25 photocatalyst fouled by the degradation of phthalic acid was examined 15 [149] reduced the fouling by salicylic acid [151]. This may be attributed to a combination of 21 enhanced breakdown leading to fewer inhibitory species as well as the metal acting as a poor 22 adsorbent site for salicylic acid and its breakdown products.…”

Section: Regenerationmentioning

confidence: 99%

Fouling and Inactivation of Titanium Dioxide-Based Photocatalytic Systems

Katz

McDonagh

Tijing

et al. 2015

Critical Reviews in Environmental Science and Technology

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Titanium dioxide is an effective photocatalyst for the breakdown of many environmental contaminants. The complex mixtures that can occur in water matrices can significantly affect the breakdown of the contaminants in water by titanium dioxide (TiO 2). In this paper, we 15 discuss a wide variety of foulants and inhibitors of photocatalytic TiO 2 systems and review different methods that can be effective for their fouling prevention. Approaches to regenerate a fouled or contaminated TiO 2 catalysts are exploredand the effect of substrates on immobilized titanium dioxide is also reviewed.

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A study on deactivation and regeneration of titanium dioxide during photocatalytic degradation of phthalic acid

Cited by 55 publications

References 24 publications

Investigation of the Photodegradation of Reactive Blue 19 on P-25 Titanium Dioxide: Effect of Experimental Parameters

Investigation of the Photodegradation of Reactive Blue 19 on P-25 Titanium Dioxide: Effect of Experimental Parameters

Recent Development of VUV-Based Processes for Air Pollutant Degradation

Fouling and Inactivation of Titanium Dioxide-Based Photocatalytic Systems

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