Effect of sunlight irradiation on photocatalytic pyrene degradation in contaminated soils by micro-nano size TiO2

Chien, Shu-Mei; Chang, Chih-Yung; Chen, S.H.; Wang, M.C.; Rao, M. Madhava; Veni, S. Satya

doi:10.1016/j.scitotenv.2011.06.050

Cited by 32 publications

(1 citation statement)

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“…The chemical composition of oil is extremely complex with a variety of organic compounds that absorb electromagnetic radiation from the ultraviolet region to the near infrared, passing through the visible ( Nicodem et al., 2001 ). Thus, the wavelength range in the ultraviolet region of sunlight can stimulate the degradation of PAHs in TiO 2 presence or absence ( Chien et al., 2011 ).…”

Section: Resultsmentioning

confidence: 99%

Optimization of the photocatalytic degradation process of aromatic organic compounds applied to mangrove sediment

Silva

Soares

Santos

et al. 2020

Heliyon

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Polycyclic aromatic hydrocarbons (PAHs) are part of a class of organic compounds resistant to natural degradation. In this way, heterogeneous photocatalysis becomes useful to degrade persistent organic pollutants, however it can be influenced by environmental variables (i.e.: organic matter) and experimental factors such as: mass of the photocatalyst and irradiation time. The objective of this research was to use a factorial design 2 k as a function of the multiple response (MR) to evaluate simultaneously experimental conditions for the photodegradation of polycyclic aromatic hydrocarbons in contaminated mangrove sediment and its application in oil from Potiguar Basin in Brazil. The sediment samples collected in Belmonte city (Southern Bahia state) were contaminated with 0.25 mg kg −1 of Acenaphthene, Anthracene, Benzo[a]Anthracene, Indene[1,2,3cd]pyrene, Dibenzo[ah]anthracene, Benzo[ghi]pyrene. Factors such as mass of the photocatalyst and irradiation time were evaluated in factorial design 2 2 , with triplicate from the central point, to 1g of the PAH contaminated sediment. After performing the experiments, it was found that the best experimental condition for the degradation of all PAHs indicated by MR was the central point (0.5 g of photocatalyst and 12h of irradiation). For such conditions, the half-life of PAHs varied from 3.51 to 9.37 h and the degradation speed constant between 0.0740 to 0.1973 h −1 . The comparison of the optimized methodology between photolysis tests and heterogeneous photocatalysis was performed using the Kruskal-Wallis test, which indicated a difference for the reference solution, where heterogeneous photocatalysis was more efficient in the degradation of PAHs. The optimized methodology was apply in samples contaminated with crude oil from Potiguar Basin, no significant difference was observed in the aromatic fraction, using for the Kruskal-Wallis test. Heterogeneous photocatalysis has shown to be a promising remediation technique to remedy aromatic organic compounds in mangrove sediments.

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Section: Resultsmentioning

confidence: 99%