Photocatalytic degradation of chlorophenols on TiO2-325mesh and TiO2-P25. An extended kinetic study of photodegradation under competitive conditions

Pino, Eduardo; Encinas, M. V.

doi:10.1016/j.jphotochem.2012.05.019

Cited by 38 publications

(19 citation statements)

References 42 publications

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“…To evaluate the effect of each process involved in the 4-NP removal during the irradiation in the presence of H 2 O 2 and Fe-MABs, the contribution of adsorption, heterogeneous photodegradation, and photo-Fenton processes were estimated by equations from (8) to (10) and illustrated in Fig. 4.…”

Section: Scheme 1 (A) Mechanism Ofmentioning

confidence: 99%

“…For this reason the research community is focused about the development of processes for pollutants removal and degradation by harmless and inexpensive techniques [9]. In the last few decades, also photochemical methodologies have been applied to pollutants degradation in air and aqueous matrices [10,11] as well as for the refinement of analytical procedures [12].…”

Section: Introductionmentioning

confidence: 99%

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Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Barreca

Colmenares

Pace

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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a b s t r a c tHybrid montmorillonite-alginate beads (MABs) were prepared by the ion-gelation method from alginate and montmorillonite clay suspension dropped in a calcium chloride solution. Similarly, iron-enriched beads (Fe-MABs) were prepared using iron-exchanged montmorillonite. All beads were characterized by atomic absorption and Fourier-transform infrared spectroscopy. The efficiency of Fe-MABs as catalysts for the solar photo-Fenton performed at initial pH = 7.0 was evaluated by varying the catalyst amount and hydrogen peroxide concentration, and monitoring the removal of 4-nitrophenol (4-NP) at initial concentration of 10 ppm. A kinetic analysis showed that the removal of 4-NP by Fe-MABs followed a pseudo first-order kinetics model (R 2 = 0.966). High 4-NP removal (75%) was achieved with 25 Fe-MABs by using 150 ppm of hydrogen peroxide and 40 min of irradiation, while total 4-NP removal was obtained by using 500 ppm of hydrogen peroxide. Moreover, preliminary studies about beads' recycling showed good removal efficiencies for the first three cycles.

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Section: Scheme 1 (A) Mechanism Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Barreca

Colmenares

Pace

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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“…Currently, TiO 2 -Degussa P25 (TiO 2 -P25) is one of the commercial photocatalysts that is highly active and commonly used. TiO 2 -P25 is used in treatment of phenolic compounds and pesticides in wastewater [4][5][6] such as phosphamidon [7], dephenamid [8], indole-3-acetic and indole-3-butyric acid [9], dimethoate [10], propham, propachlor and tebuthiron [11], 4-chlorophenol and 2,6-dicholorophenol [12]; substances in urban wastewater (acetaminophen, antipyrine, atrazine, carbamazepine, diclofenac, flumequine, hydroxybiphenyl, ibuprofen, isoproturon, ketorolac, ofloxacin, progesterone, sulfamethoxazole and triclosan) [13,14], textile wastewater (reactive red 4, methylene blue [15][16][17], reactive red 222 [18], crystal violet [19], remazol black [16], methyl orange and congo red [20]), herbicide (picloram [21] and imazethapyr [22] [25]. However, the photocatalytic reaction of TiO 2 using various oxidizing agents to degrade CA wasn't studied.…”

Section: Introductionmentioning

confidence: 99%

APPLICATION OF TiO2–P25 IN THE PHOTODEGRADATION OF n–LAURYL DIETHANOLAMINE AND CINNAMIC ACID IN PRESENCE OF OXYGEN

Lộc¹

2018

JST

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In this paper, the activity of TiO 2 -P25 in the photodecomposition of recalcitrant organic compounds such as n-lauryl diethanolamine (n-LDA) and cinnamic acid (CA) solution in UV + BLED light in presence of oxygen was investigated and the optimum conditions of reaction were determined. With physicochemical characteristics such as anatase/rutile ratio of 80/20, the crystallite size of 23 nm, BET surface area of 43.6, the light absorption wavelength of 390 nm, band gap energy of 3.17 eV, and point of zero charge of 6.3, TiO 2 -P25 catalyst is able to photodecompose more than 95 % of LDA and CA after 90 minutes in presence of oxygen under irradiation of UV-B light.

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“…Also, they can be generated during chlorination disinfection of drinking water. [1,2] These phenolic compounds are categorised by USEPA as priority pollutants. [3,4] The presence of these contaminants in water can be harmful and dangerous on human, animal and plant life and also causes serious environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Solar photocatalytic degradation of chlorophenols mixture (4-CP and 2,4-DCP): Mechanism and kinetic modelling

Abeish

Ang

Znad

2015

Journal of Environmental Science and Health, Part A

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The solar-photocatalytic degradation mechanisms and kinetics of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) using TiO2 have been investigated both individually and combined. The individual solar-photocatalytic degradation of both phenolic compounds showed that the reaction rates follow pseudo-first-order reaction. During the individual photocatalytic degradation of both 4-CP and 2,4-DCP under the same condition of TiO2 (0.5 g L(-1)) and light intensities (1000 mW cm(-2)) different intermediates were detected, three compounds associated with 4-CP (hydroquinone (HQ), phenol (Ph) and 4-chlorocatechol (4-cCat)) and two compounds associated with 2,4-DCP (4-CP and Ph). The photocatalytic degradation of the combined mixture (4-CP and 2,4-DCP) was also investigated at the same conditions and different 2,4-DCP initial concentrations. The results showed that the degradation rate of 4-CP decreases when the 2,4-DCP concentration increases. Furthermore, the intermediates detected were similar to that found in the individual degradation but with high Ph concentration. Therefore, a possible reaction mechanism for degradation of this combined mixture was proposed. Moreover, a modified Langmuir-Hinshelwood (L-H) kinetic model considering all detected intermediates was developed. A good agreement between experimental and estimated results was achieved. This model can be useful for scaling-up purposes more accurately as its considering the intermediates formed, which has a significant effect on degrading the main pollutants (4-CP and 2,4-DCP).

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Photocatalytic degradation of chlorophenols on TiO2-325mesh and TiO2-P25. An extended kinetic study of photodegradation under competitive conditions

Cited by 38 publications

References 42 publications

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

APPLICATION OF TiO2–P25 IN THE PHOTODEGRADATION OF n–LAURYL DIETHANOLAMINE AND CINNAMIC ACID IN PRESENCE OF OXYGEN

Solar photocatalytic degradation of chlorophenols mixture (4-CP and 2,4-DCP): Mechanism and kinetic modelling

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