Kinetic correlation between degradation and dechlorination of perchloroethylene in the Fenton reaction

Abstract

In the Fenton reaction, degradation and dechlorination are directly affected by the concentrations of hydrogen peroxide and Fe 3+ . Although there is considerable research on the biodegradation of chlorinated compounds combined with the Fenton reaction, the kinetics of degradation and dechlorination of the reaction, with various concentrations of hydrogen peroxide and Fe 3+ , have been rarely investigated. Therefore, we investigated the degradation and dechlorination of PCE with various concentrations of hydrogen peroxide and Fe 3+ . The initial concentration of PCE (10 µM) decreased from a value of 8.9 µM (with 0.1 mM of hydrogen peroxide and 5 mM of Fe 3+ ) to 1.1 µM (with 10 mM of hydrogen peroxide and 5 mM of Fe 3+ ); the respective values for chloride ions produced were 0.9 and 21.6 µM. Also, the initial 10 µM of PCE decreased from 8.9 (with 0.1 mM of Fe 3+ and 5 mM of hydrogen peroxide) to 2.2 µM (with 10 mM of Fe 3+ and 5 mM of hydrogen peroxide); the respective chloride ions produced were 0.7 and 14.5 µM. The logarithmic correlations between the degradation and dechlorination coefficients were 0.7682 and 0.7834 for concentrations of hydrogen peroxide and Fe 3+ , respectively. Both coefficients were used, from all possible cases, to derive six models which displayed both the ratio of degradation and dechlorination and the hydrogen peroxide and Fe 3+ concentrations. The dechlorination of PCE could then be predicted with the model obtained by the coefficient with the concentration of hydrogen peroxide and Fe 3+ . The models could be applied to various Fenton reactions for optimization of degradation or dechlorination, such as biodegradation of PCE which is scarcely degraded by aerobic bacteria.

Synthesis of Pd-M@HCS(M = Co, Ni, Cu) Bimetallic Catalysts and Their Catalytic Performance for Direct Synthesis of H2O2

“…Hydrogen peroxide (H 2 O 2 ), which has been diversely used for producing a wide range of products [1][2][3][4][5][6], is considered a green and clean raw material due to its highly atomic utilization and environmentally friendly properties. The direct synthesis of H 2 O 2 (DSHP) from hydrogen and oxygen is believed a promising method since H 2 O is the only by-product during the producing process [7][8][9].…”

Comparative investigation of argon and argon/oxygen plasma performance for Perchloroethylene (PCE) removal from aqueous solution: optimization and kinetic study

“…Typical wastewater treatment methods are not effective in PCE removal and this pollutant must be decomposed into simpler compounds by using a strong oxidizer to become a biodegradable for microorganism through biological process. So, chemical processes are often used along with biological processes for PCE removal, which makes the treatment of this pollutant complex and difficult [15]. Advanced oxidation process (AOP), reverse osmosis and nano-filtration membranes, adsorption and ozonation process have been proven to be effective in PCE removal [12].…”

Decolorization and COD removal from real textile wastewater by chemical and electrochemical Fenton processes: a comparative study

“…The hydroxyl radical is a nonselective and extremely powerful oxidant that rate constants with organic matters fall in to a range of 10 9 - 10 10 M -1 S -1 [ 9 - 11 ]. Among the AOPs, Chemical Fenton (CF) process is particularly attractive for its simplicity without requirement for special equipment [ 12 ] and also for its ability in partial mineralization, lowering toxicity, and increasing wastewater susceptibility to biodegradation [ 13 ]. During CF process, ferrous ion reacts with hydrogen peroxide to generate the hydroxyl radical at low pH [ 14 - 16 ]:…”