Photodegradation of hexabromocyclododecane (HBCD) by Fe(III) complexes/H2O 2 under simulated sunlight.
Hexabromocyclododecane (HBCD) is a globally produced brominated flame retardant used primarily as an additive flame retardant in polystyrene and textile products. Photodegradation of HBCD in the presence of Fe(III)-carboxylate complexes/H2O2 was investigated under simulated sunlight. The degradation of HBCD decreased with increasing pH in the Fe(III)-oxalate solutions. In contrast, the optimum pH was 5.0 for the Fe(III)-citrate-catalyzed photodegradation within the range of 3.0 to 7.0. For both Fe(III)-oxalate and Fe(III)-citrate complexes, the increase of carboxylate concentrations facilitated the photodegradation. The photochemical removal of HBCD was related to the photoreactivity and speciation distribution of Fe(III) complexes. The addition of H2O2 markedly accelerated the degradation of HBCD in the presence of Fe(III)-citrate complexes. The quenching experiments showed that ·OH was responsible for the photodegradation of HBCD in the Fe(III)-carboxylate complexes/H2O2 solutions. The results suggest that Fe(III) complexes/H2O2 catalysis is a potential method for the removal of HBCD in the aqueous solutions.
College of Material Science and Chemical Engineering, China University of Geosciences, Wuhan, 430074, China.
Danna
D
Zhou
Yao
Y
Wu
Xiaonan
X
Feng
Yong
Y
Chen
Zongping
Z
Wang
Tao
T
Tao
Dongbin
D
Wei
D002264:Carboxylic Acids; D019343:Citric Acid / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods; D005290:Ferric Compounds / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000032:analysis / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry; D010782:Photolysis; D013472:Sunlight; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D002264:Carboxylic Acids; D005290:Ferric Compounds; D006842:Hydrocarbons, Brominated; D010070:Oxalates; D014874:Water Pollutants, Chemical; D019343:Citric Acid; C089796:hexabromocyclododecane; D006861:Hydrogen Peroxide