Degradation of carbon tetrachloride by modified Fenton’s reagent

Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

“…The chemistry of the Fenton's process is based upon the reaction of hydrogen peroxide (E 0 = 1.80 and 0.87 V at pH 0 and 14 respectively) with a proper catalyst, leading to the generation of a pool of radicals [1], capable of non-selectively oxidizing a wide range of biorefractory organic pollutants such as chlorinated aliphatics, halogenated phenols, PAHs and PCBs. The radical produced in the Fenton's initiation Reaction (I) is the hydroxyl radical, whose formation can be achieved by adding an homogeneous catalyst, such as a transition metal salt [3,4], by generating the metal catalyst electrochemically by means of sacrificial steel electrodes or by using the metals naturally occurring in the environment as heterogeneous catalyst [5][6][7][8][9][10][11][12] The hydroxyl radicals generated through Reaction (I) react with hydrogen peroxide and begin a series of propagation reactions [2] …”

Reaction kinetics for the degradation of phenol and chlorinated phenols using Fenton's reagent

“…Teel and Watts [19] reported that the Fenton's reaction must be modified to effectively degrade carbon tetrachloride, which is generally regarded as a persistent pollutant and difficult to treat. They modified the reaction by adding iron (III) catalyst instead of using iron (II) in modified Fenton's systems.…”

Tetrachloroethylene and hexachloroethane degradation in Fe(III) and Fe(III)–citrate catalyzed Fenton systems

“…The degradation of carbon tetrachloride, a compound bearing similarity to HCA in its structure and degradation mechanism, by a Fe(III) initiated Fenton reaction has also similarly shown an increase with H 2 O 2 . 16 The amount of HCA degraded was similar in vials with the individual chemical and those with the PCE-HCA mixture (Fig. 4(b) and 4(c)), indicating that the O •− 2 pool in the two systems was similar.…”