Kinetic study of the 4-Nitrophenol photooxidation and photoreduction reactions using CdS

Hernández-Gordillo, Agileo; Romero, A.; Tzompantzi, Francisco; Gómez, R.

doi:10.1016/j.apcatb.2013.07.030

Cited by 56 publications

(20 citation statements)

References 30 publications

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“…The zero‐order rate constants of the photocatalytic reduction of 4‐NP in the presence of Na 2 SO 3 using the CeO 2 support and the Ir/CeO 2 series were calculated using the equation [ C ] = [ C 0 ] − kt , where [ C ] is the remaining concentration at time t, [ C 0 ] is the 4‐NPhate ion initial concentration and k is the apparent rate constant. This reaction order also was reported by other authors for this photocatalytic reaction . The zero‐order kinetics suggest that the disappearing rate of the nitroaromatic pollutant is maintained as time progresses, indicating that it is independent of the 4‐NPhate ion concentration.…”

Section: Resultssupporting

confidence: 90%

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Castañeda

Alvarado

Martínez

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Photoreduction of 4-nitrophenol (4-NP) photocatalytically to 4-aminophenol (4-AP) is considered a promising treatment of this recalcitrant pollutant. 4-aminophenol is widely applied as an intermediate in the pharmaceutical and agricultural industries. In this work, iridium/cerium dioxide (Ir/CeO 2 ) photocatalysts with different Ir contents (0.5, 1.0 and 2.0 wt%) were studied in the photoreduction of 4-NP using Na 2 SO 3 as hole scavengers under UV irradiation. In order to identify their physicochemical properties, the materials were studied by several techniques and photoactivity was monitored by UV-visible spectroscopy. RESULTS:The characterization results provided evidence that the modification of CeO 2 by impregnation of Ir causes a decrease in CeO 2 textural properties and its band gap energy. The photocatalytic reduction of 4-nitrophenol was enhanced by 26.1% using Ir/CeO 2 1.0 wt% in comparison with CeO 2 support. The phrase is related with the comparison between the photocatalytic behavior of Ir/CeO 2 1.0 wt% photocatalyst in regard the results evidenced with CeO 2 unmodified. An effect of the metal loading over photoactivity was observed and the optimal Ir content was 1.0 wt%. A reduction of 84% was obtained using 1.0 wt%Ir/CeO 2 , whereas for higher metal loading (2.0 wt%) 4-NP reduction decreased by 72%. CONCLUSION:The enhancement in the photocatalytic behavior of the Ir/CeO 2 series could be related to the presence of Ir + and Ir 0 species evidenced by X-ray photoelectron spectroscopy (XPS), thus, Ir + species could favor the adsorption of the pollutant and Ir 0 particles could act as trap of the photogenerated electrons that are responsible for reduction of the nitrocompound. The decrease in photoactivity when 2.0 wt% Ir/CeO 2 was used as photocatalyst could be associated with partial blockage of the surface active sites by increasing amounts of metal.

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Section: Resultssupporting

confidence: 90%

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Castañeda

Alvarado

Martínez

et al. 2019

J of Chemical Tech & Biotech

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“…Samples were taken every 30 min, and centrifuged in order to remove the photocatalysts with a centrifuge at 10 000 rpm for 10 min, the clear solution was analyzed using spectrophotometric method on a 7SS2 spectrophotometer (made in Shanghai, China), and the absorbance was measured at a wavelength of 318 nm which is the maximum absorption wavelength of 4‐nitrophenol. The spectrophotometric method is a widely‐used and effective tool to analyse 4‐nitrophenol concentration …”

Section: Methodsmentioning

confidence: 99%

Efficient photocatalytic degradation of 4‐nitrophenol over graphene modified TiO₂

Liu

Zhao

Lai

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: Photocatalytic degradation of organic compounds, including nitrophenol, is one of the most popular approaches to pollution control and disposal. Graphene-based nanocomposites have attracted considerable attention in photocatalytic research owing to their excellent electrical, thermal and mechanical properties. In this work, TiO 2 material was modified with graphene by a hydrothermal method, the photocatalytic performance of the prepared catalyst was evaluated by degradation of 4-nitrophenol, which is a highly toxic, stable and carcinogenic organic pollutant. RESULTS:The characterization results showed that the low amount of graphene disperses well over TiO 2 and it does not influence the crystal phase, but makes the specific surface area of graphene/TiO 2 greater than that of TiO 2 . Compared with TiO 2 , graphene/TiO 2 exhibits enhanced photocatalytic activity for the degradation of 4-nitrophenol under simulated solar irradiation. CONCLUSION:The enhanced activity of photo-degradation could be attributed to the involved graphene being beneficial to charge transportation and separation of photogenerated charge carriers, and providing more surface active sites for degradation reaction of the target pollutant. The present result highlights the important application of graphene as a novel carbon material in treating highly toxic pollutant through photocatalysis technology.

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“…19 However, these organic compounds are highly hazardous contaminants, found in agricultural and industrial wastewaters which aggravate and have signicant damages to the environment. 20 Among nitroaromatic compounds, 4-nitrophenol (4-NP) is one of the most toxic and refractory organic pollutants frequently release from explosives, plasticizers herbicides, and pesticides industries. 21 In addition to this, synthetic dyes in different industries such as leather treatment, dyeing of cloth, plastics, paper and pulp manufacturing, and printing have been used widely and could be a cause of environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a hierarchical structured NiO/NiS composite catalyst for reduction of 4-nitrophenol and organic dyes

Zelekew

Kuo

2017

RSC Adv.

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Kinetic study of the 4-Nitrophenol photooxidation and photoreduction reactions using CdS

Cited by 56 publications

References 30 publications

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Efficient photocatalytic degradation of 4‐nitrophenol over graphene modified TiO₂

Synthesis of a hierarchical structured NiO/NiS composite catalyst for reduction of 4-nitrophenol and organic dyes

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Kinetic study of the 4-Nitrophenol photooxidation and photoreduction reactions using CdS

Cited by 56 publications

References 30 publications

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO2 photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO2 photocatalysts under UV irradiation

Efficient photocatalytic degradation of 4‐nitrophenol over graphene modified TiO2

Synthesis of a hierarchical structured NiO/NiS composite catalyst for reduction of 4-nitrophenol and organic dyes

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Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Efficient photocatalytic degradation of 4‐nitrophenol over graphene modified TiO₂