This study describes major findings on PCP removal by Fe0/H2O and Fe0/CO2/H2O2. The bubbling of CO2 was proved to be an effective and efficient way to obtain acidic solution, which was advantageous for Fe0 to release electrons into the reaction system. At a neutral pH, the PCP mostly with ionized form tends to be adsorbed onto iron particles surface. With an acidic pH, the PCP mostly with molecular form appears to attach adhesively on the surface of reactor wall and tubing of the reaction system. In addition, water molecules compete for Fe0-released electrons more strongly than the PCP, leading to the rising of pH and absence of Cl-. However, PCP can be dechlorinated through the pathways of Fenton-like and Fenton reaction, the later of which was created by adding H2O2 at a later stage into the Fe0/CO2 system.
