Solar photocatalytic degradation of 4-chlorophenol: mechanism and kinetic modelling

Abeish, Abdulbasit M.; Ang, Ha Ming; Znad, Hussein

doi:10.1080/19443994.2013.869665

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…We observed peaks that could be assigned to juglone and benzoquinone after the photodegradation of DHN and CP, respectively (Figure S18). This observation is in tune with known literature reports [39,42] and thus confirms the photodegradation of DHN and CP. On the other hand, after photodegradation, DMF and CPF gave a complex mixture of products.…”

Section: Resultssupporting

confidence: 92%

Photocatalytic Degradation of Water Pollutants and Pesticides Using Plasmon‐Molecule Coupled Gold‐BODIPY Nanoparticles

Hemant

Rahman²,

Neelakandan³

2023

ChemNanoMat

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Development of effective and sustainable water treatment processes is the need‐of‐the‐hour for addressing the global water crisis. Here, we report the synthesis of a plasmon‐molecule coupled nanocomposite (NC) and its photosensitization properties in solution and on thin films. Our results indicate that the thin films exhibit excellent stability at different temperatures and pH conditions and that the plasmonic photoexcitations result in efficient generation of singlet oxygen. The thin film serves as a heterogeneous photocatalyst for the degradation of a variety of water pollutants and pesticides. This approach thus offers a low‐cost, environmental friendly and singlet oxygen mediated photocatalytic solution for degrading organic contaminants.

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Section: Resultssupporting

confidence: 92%

Photocatalytic Degradation of Water Pollutants and Pesticides Using Plasmon‐Molecule Coupled Gold‐BODIPY Nanoparticles

Hemant

Rahman²,

Neelakandan³

2023

ChemNanoMat

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“…The maximum amounts of all these intermediates were at 60 min, but most of them were degraded at 150 min solar irradiation time. Compared to our previous work, where no ferric ions were used, the solar photocatalytic degradation time has been significantly reduced from 240 min to about 150 min. This could be attributed to Fe 3+ used as an electron acceptor that will effectively reduce the e – /h + recombination by trapping the photogenerated electron (e – ) as well as generating more • OH radicals …”

Section: Resultscontrasting

confidence: 64%

Enhanced Solar-Photocatalytic Degradation of Combined Chlorophenols Using Ferric Ions and Hydrogen Peroxide

Abeish

Ang

Znad

2014

Ind. Eng. Chem. Res.

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The influences of ferric ions (Fe3+) and hydrogen peroxide (H2O2) on the degradation of combined chlorophenols during solar/TiO2 process were investigated. 4-Chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) were used as a chlorophenols combined mixture. Fe3+ ions have shown considerable effect on the solar-photocatalytic degradation rate of the mixture and its intermediates. Different amounts of Fe3+ ions were used, and the optimum value was 10 mg/L. At these conditions, three major intermediates were detected including hydroquinone (HQ), phenol (Ph), and 4-chlorocatechol (4-cCat). However, the concentrations of these aromatic intermediates were less than that of using TiO2 alone as well as the degradation time was reduced to 150 min. H2O2 was also effectively used as a degradation enhancer at various concentrations together with Fe3+ ions in order to improve the solar-photocatalytic degradation rate and the optimum value was 3.41 mM. The degradation efficiency of the combined mixture increased sharply in the presence of H2O2. Additionally, an extremely high degradation rate of the main pollutants and their intermediates was achieved when using Fe3+ ions and H2O2 together with TiO2. Furthermore, only two intermediates HQ and Ph were observed in this case. The complete degradation of the main chlorophenolic compounds and their intermediates was achieved within 130 min of solar irradiation.

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“…All of these compounds were identified in previous studies. [31,32] From our previous work [33] it should be mentioned that both HQ and 4-cCat were the two major aromatic intermediates detected during 4-CP photocatalytic degradation on TiO 2 . Also, from these results, it can be seen that the HQ can be formed by Cl ¡ cleavage and hydroxylation of 4-CP, whereas 4-cCat can be produced by hydroxylation only.…”

Section: ¡1mentioning

confidence: 97%

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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Solar photocatalytic degradation of 4-chlorophenol: mechanism and kinetic modelling

Cited by 6 publications

References 36 publications

Photocatalytic Degradation of Water Pollutants and Pesticides Using Plasmon‐Molecule Coupled Gold‐BODIPY Nanoparticles

Photocatalytic Degradation of Water Pollutants and Pesticides Using Plasmon‐Molecule Coupled Gold‐BODIPY Nanoparticles

Enhanced Solar-Photocatalytic Degradation of Combined Chlorophenols Using Ferric Ions and Hydrogen Peroxide

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

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