Chemical Oxidation of Polycyclic Aromatic Hydrocarbons in Water By Ferrates(VI)

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are a common part of the environment where they come from burning fossil fuels (through an incomplete combustion process). From a toxicological point of view, PAHs are considered to be carcinogens with a mutagenic and teratogenic effect. On the other hand, ferrates are generally believed to be the ideal chemical agent for water treatment due to their strong oxidation potential. Herein, the efficiency of degradation of PAHs (with the special emphasis on B[a]P) by ferrates under laboratory conditions was studied. The formation of degradation products was also considered. For this, two types of ferrates were used and both of them efficiently degraded B[a]P. When comparing ferrates that were bought from a Czech and USA company, no significant changes in terms of B[a]P degradability were observed. It was determined that the degradation efficiency of PAHs by ferrates was dependent on their molecular weight. Two and three cyclic PAHs have been completely degraded within 30 minutes, whereas five (and more) cyclic PAHs, only partially. The results obtained with ferrates were compared to the ones obtained with a classical oxidizing agent - KMnO4. In a qualitative test to detect degradation products of PAHs, two were identified, namely fluoren-9-one derived from fluorene and acentaphthylene, formed from acenaphthene.

Bio-Based Adsorption as Ecofriendly Method for Wastewater Decontamination: A Review

“…The study showed that ferrates can degrade PAHs, but the resistance to this degradation increases with their molecular weight. In fact, PAHs with two or three benzene rings were totally degraded within 30 min, while those with five or more rings were only partially degraded [ 53 ]. Concerning this method, the main disadvantage is the use of chemicals [ 52 ].…”

The Impact of Propanol, N-Butanol and Pentanol on Aqueous Dispersions of Sonicated Liposomes. EPR Study

“…They are most often used as solvents or components in technological processes. Alcohols are also a substance in which potassium ferrate, insoluble in ordinary solvents, may be suspended [1]. In everyday life, above all, we find alcohols containing a single hydroxyl group, the so-called monohydric alcohols, whose general formula can be written as C n H 2n+1 OH.…”

Use of an automated respirometer for in situ chemical oxidation (ISCO) activator type and concentration selection

“…Various forms of oxidising agent are used for ISCO including hydrogen peroxide (H 2 O 2 ), ozone (O 3 ), percarbonate, permanganate, and persulphate (Devi et al 2016;Watts and Teel 2006;Apul et al 2016) and emerging agents such as ferrates(VI) (Antošová et al 2020). Oxidising agents are typically used in combination with one or more activator (Do et al 2013;Wacławek et al 2017).…”