Identification of Photolytical Transformation Products of Pentachlorophenol in Water

Abstract

The photodegradation of pentachlorophenol in water was examined with a high-pressure mercury lamp. A number of photodegradation products of pentachlorophenol, such as less-chlorinated phenols through reductive dechlorination, and catechol and trihydroxylated products via the addition of hydroxyl radicals, were observed as major products. Moreover, polychlorinated biphenylethers, hydroxylated polychlorobiphenylethers and polychlorinated dibenzo-p-dioxins as minor products were also formed by dimerization process during the photolysis of pentachlorophenol. These compounds were identified by gas chromatography-mass spectrometry. The degradation rate of PCP in water was measured against the UV-irradiation time. After the irradiation for 15 min, 75% of PCP was converted into a number of products through reductive dechlorination and oxidation. On the basis of the identified products, the photodegradation pathways of PCP under UV irradiation were proposed.

Synergistic biodegradation of pentachlorophenol by Bacillus cereus (DQ002384), Serratia marcescens (AY927692) and Serratia marcescens (DQ002385)

“…The results show that the PCP dechlorination pathway can be tracked from the GC-MS analysis. Similar to the results of previously reported by Piccininia et al (1998), Hong et al (2000, Suegara et al (2005). Therefore, this mixed culture may be used for bioremediation of PCP containing wastewater from pulp paper mill, pharmaceuticals, pesticides and agro based industries.…”

Presumed decomposition pathway of pentachlorophenol through atomic charge calculation and photodecomposition experiments

“…Therefore, it is assumed that 235T3CP and 236T3CP are dechlorination reaction products of 2356T4CP, and that 234T3CP is a de-chlorination reaction product of 2346T4CP. This research itself does not identify such T3CP products, but 235T3CP is reported as an ultraviolet decomposition product of PCP (Hong et al 2000). The atomic charge value of 235T3CP is highest at position 3, which suggests that 25D2CP will be generated as a by-product.…”

“…Reports have been made on the photodecomposition and removal efficiency of each organochlorine compound, on the identification of intermediate products during photodecomposition, and on the design of the treatment equipment required by the method (Hong et al 2000).…”

Identification of Electrical Degradation Products of 4-Chlorophenol in Water

“…Hydroxylated diphenyl was formed as precursors of dioxins during photolysis and pyrolysis of chlorophenols in our previous report. 27 Hydroxylated dichlorodibenzodioxin and furans were also observed.…”

“…27 Mass spectra of their TMS derivatives were characterized by the presence of their molecular ion, [M-15] + , [M-OTMS + H] + ion and their distribution of 37 Cl isotope ions. In EI, they yielded intense molecular ions because of their rigid and aromatic planar structure.…”