The effect of photosensitizer on diclofenac photodegradation under simulated sunlight

Zhang, N.; Liu, G. G.; Liu, H. J.; Wang, Y. L.; Li, T.

doi:10.2166/wst.2012.590

Cited by 2 publications

(2 citation statements)

References 13 publications

(13 reference statements)

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“…Pigment, nitrate and nitrite have been reported to have inhibiting effects on the photodegradation of diclofenac. 139,140 The direct photodegradation routes of diclofenac have been predicted by Musa and Eriksson through a computational quantum chemistry method. 141 As illustrated in Fig.…”

Section: Diclofenacmentioning

confidence: 99%

Photo-transformation of pharmaceutically active compounds in the aqueous environment: a review

Yan

Song

2014

Environ. Sci.: Processes Impacts

130

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In the past few years, the fate and transportation of pharmaceutically active compounds (PhACs) in aqueous environments have raised significant concerns among the public, scientists and regulatory groups. Photodegradation is an important removal process in surface waters. This review summarizes the last 10 years (2003-2013) of studies on the solar or solar-simulated photodegradation of PhACs in aqueous environments. The PhACs covered include: beta-blockers, antibiotics, non-steroidal anti-inflammatory drugs (NSAIDs), histamine H₂-receptor antagonists, lipid regulators, carbamazepine, steroid hormones, and X-ray contrast media compounds. Kinetic studies, degradation mechanisms and toxicity removal are the three major topics involved in this review. The quantum yield for the direct photolysis of PhACs and the bimolecular reaction rate constants of PhACs with reactive oxygen species (ROS), such as the ˙OH radical and singlet oxygen, are also summarized. This information is not only important to predict the PhAC photodegradation fate, but also is very useful for advanced treatment technologies, such as ozone or advanced oxidation processes.

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Section: Diclofenacmentioning

confidence: 99%

Photo-transformation of pharmaceutically active compounds in the aqueous environment: a review

Yan

Song

2014

Environ. Sci.: Processes Impacts

130

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“…According to the literature, the photodegradation of synthetic dyes in aqueous solutions could be much enhanced by using photosensiting species. Among these, acetone and hydrogen peroxide are mentioned as photosensitizers and/or •OH sinks [29,30].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the TiO2-Ag Photocatalytic Efficiency by Acetone in the Dye Removal from Wastewater

Duduman

Castro

Apostolescu

et al. 2022

Water

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TiO2 nanoparticles synthesized by the sol-gel method and doped with Ag were characterized by SEM, EDAX, FTIR, BET, XRD and TEM, then tested in the photocatalytic degradation of methylene blue (MB) under UV irradiation. The experimental results indicate that the average size of the raw particles was 10 nm, and their size was increased by calcination. The photocatalytic degradation of MB on nanostructured TiO2-Ag shows a high degradation efficiency upon the addition of a photosensitizer. A parametric study of the process was performed and has revealed the optimal value of the photocatalyst dose (0.3 g L−1) at a MB concentration of 4 ppm. Afterwards, the effect of acetone as a photosensitizer was studied. A MB degradation mechanism was proposed to explain the synergy between the TiO2 and the silver nanoparticles in the degradation performance. Under the optimal experimental conditions, at photosensitizer doses of 0.1 and 0.2%, yields of 92.38% and 97.25% MB degradation were achieved, respectively. Kinetic models showed that, at 0.1% acetone concentration, the data fit the pseudo-first-order model, while at 0.2% acetone, the photodegradation mechanism fits a second-order model. The values of the apparent rate constants indicate that the reaction rate increased between 24 and 40 times in the presence of acetone on TiO2 and TiO2-Ag. The addition of acetone modified the photodegradation mechanism and the Ag-doped samples became more active. The results of recycling tests using calcined TiO2-Ag material clearly show that the material was highly photocatalytically stable for the MB degradation. According to experimental results, the dye degradation decreased from 97.25% to 92.39% after four consecutive cycles. This simple approach could be applied for the advanced cleaning of wastewater contaminated with dyes, in the perspective of its reuse.

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The effect of photosensitizer on diclofenac photodegradation under simulated sunlight

Cited by 2 publications

References 13 publications

Photo-transformation of pharmaceutically active compounds in the aqueous environment: a review

Photo-transformation of pharmaceutically active compounds in the aqueous environment: a review

Enhancing the TiO2-Ag Photocatalytic Efficiency by Acetone in the Dye Removal from Wastewater

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