Phenol-formaldehyde mixtures were impossible to detoxify by heterogeneous photocatalysis at any of the studied concentrations. Treatments using the Fenton reaction were able to degrade concentrations above 1000 mg L-1, though the use of a reagent such as peroxide makes it a costly technique. The efficiency of the biological aerated filter (BAF) mainly depended on initial concentration and toxicity, with

removal rates of 3.08 and 0.26 g L-1 d(-1) obtained for phenol and formaldehyde, respectively. Taking into account the results obtained for the treatment of complex phenol-formaldehyde mixtures, the best combination of techniques for the treatment of concentrations found in the industrial wastewater studied in this click here paper was the Fenton + BAF technique which was able to detoxify phenol-formaldehyde

concentrations (1:1) of 1000 mg L-1. (C) 2014 Elsevier B.V. All rights reserved.”
“We present Fourier-transform infrared (FTIR) spectroscopic studies of the IR-induced CI + H-2 (v = 1) – bigger than HC1 + H reaction in a parahydrogen (pH(2)) matrix aimed at distinguishing between two proposed reactions mechanisms; direct-IR and vibron-mediated. The Cl atom reactants are produced via 355 nm in situ photolysis of a Cl-2 doped pH(2) matrix. After photolysis is complete, a long-pass IR filter in the FTIR beam is removed and we selleck products measure the ensuing IR-induced reaction kinetics using rapid scan FTIR spectroscopy. We follow both the decay of the Cl atom reactant and growth of the HCl product using the Cl spin-orbit (SO) + Q(1)(0) and HC1 R-1(0) transitions, respectively. We show the IR-induced reaction mechanism depends on the spectral profile of the IR radiation; for IR spectral profiles that have significant IR intensities between 4000 and 5000 cm(-1) we observe first-order kinetics that are assigned to a vibron-mediated mechanism and for spectral profiles that have significant IR intensities that include the Cl SO + Q1(0) transition near 5094 cm(-1) we observe bi-exponential kinetics that are dominated by the direct-IR mechanism at early reaction times. We can distinguish between the two

mechanisms using the observed kinetics. We investigate the reaction kinetics for different FTIR optical setups, for a range of sample this website conditions, and start and stop the IR-induced reaction to investigate the importance of secondary H atom reactions. We also study the IR-induced reaction in Br/Cl co-doped pH2 samples and show the presence of the Br atom quenches the vibron-mediated reaction kinetics presumably because the Bratoms serve as efficient vibron traps. This paper indicates that in a highly enriched pH2 matrix the H atoms that are produced by the IR-induced Cl atom reaction likely do not play a significant role in the measured reaction kinetics which implies these secondary H atom reactions are highly selective. (C) 2015 Elsevier Inc. All rights reserved.