Health & Environmental Research Online (HERO)


Print Feedback Export to File
8486497 
Book/Book Chapter 
Oxidative degradation of organic pollutants by Fenton reaction in pyrite suspension 
Bae, S; Choi, K; Lee, W 
2013 
Nova Science Publishers, Inc. 
Pyrite: Synthesis, Characterization and Uses 
41-68 
English 
Organic pollutants such as chlorinated compounds, polycyclic aromatic hydrocarbons, and pharmaceuticals are widespread in our natural environments. Contamination by these organic pollutants has been continuously reported in all over the world and threatened human health due to their toxicity. Many efforts to treat the organic pollutants have been extensively made to date. In this chapter, pyrite was used to oxidatively degrade the organic pollutants (trichloroethylene (TCE), carbon tetrachloride (CT), pyrene, and diclofenac) by a homogeneous Fenton-like reaction using pyrite (pyrite Fenton reaction). Oxidative degradations of TCE (97%) and CT (93%) were significantly enhanced by the pyrite Fenton reaction compared to homogeneous Fenton reactions (classic Fenton reaction; 77 and 52%, respectively). Degradation kinetic was significantly inhibited (99 to 44%) by addition of 2-propanol (OH radical scavenger) for TCE degradation, while CT degradation was enhanced (80 to 91%), indicating that oxidative degradation of TCE and reductive degradation of CT were selectively occurred during the pyrite Fenton reaction. Pyrene solubilized in cetylpyridinium chloride surfactant solution and diclofenac were also effectively degraded by the pyrite Fenton reaction (100 and 84%) compared to classic Fenton reaction (67 and 24%, respectively). Degradation kinetic rate constants of pyrene and diclofenac linearly increased as pyrite and H2O2 concentrations increased by a certain amount and then stayed and/or decreased as they exceeded the optimum value. This is due to a scavenging effect consuming OH radical by remaining Fe(II) and H2O2 in the pyrite suspensions. The results obtained by this study can provide basic knowledge to fully understand reaction mechanisms of the oxidative degradations of various organic pollutants by pyrite Fenton reactions and to widen its utilities to effectively and rapidly treat other hazardous organic pollutants. © 2013 by Nova Science Publishers, Inc. All rights reserved.