Steel dust catalysis for Fenton-like oxidation of polychlorinated dibenzo-p-dioxins.
An advanced oxidation process (AOP) for degrading toxic contaminants, specifically polychlorinated dibenzo-p-dioxins (PCDDs), was developed to utilize steel dust, a steel industry by-product, as the heterogenous catalyst for a Fenton-like oxidation. The steel dust was treated using a chemical acid etchant (HCl) and ultrasound to remove surface anchored groups, reduce aggregation, and thereby increase the specific surface areas, resulting in increased access to catalytic sites. The removal of PCDD was optimized through various reaction conditions. The removal percentage of 1,2,3,4-tetrachlorintated dibenzo-p-dioxins (1,2,3,4-TCDD, 3.1 microM) after 3 h of Fenton-like oxidation under the conditions of 3 g/L (88 mM) H(2)O(2) and pH 3 was approximately 97% with 10 g/L of steel dust, compared to approximately 99% when 5 g/L metallic iron was used as a control. When a PCDD mixture (0.5-0.7 nM) was treated, 10 g/L (92 mM) steel dust achieved approximately 88% removal, comparable to the removal with 5 g/L (89 mM) Fisher iron with 3 g/L (88 mM) H(2)O(2.) These results indicate that the steel dust is a potentially viable catalyst for removing PCDDs from contaminated water.
Lee
Jae-Min
JM
School of Environmental Science and Engineering, POSTECH, Pohang 790-784, Republic of Korea.
Kim
Ji-Hun
JH
Chang
Yoon-Young
YY
Chang
Yoon-Seok
YS
D002384:Catalysis; D017606:Chlorine Compounds / Q000737:chemistry*; D004147:Dioxins / Q000737:chemistry*; D004391:Dust; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010084:Oxidation-Reduction; D013232:Steel / Q000737:chemistry*
D017606:Chlorine Compounds; D004147:Dioxins; D004391:Dust; C045076:Fenton's reagent; D013232:Steel; D006861:Hydrogen Peroxide; D007501:Iron; C020887:dibenzo(1,4)dioxin