[Oxidative transformation of 17beta-estradiol at the interface of delta-MnO2 and water].
The oxidative transformation of 17beta-estradiol (E2) by the delta-MnO2 was investigated in batch experiments, and the influence of pH and delta-MnO2 dosage on the reaction process was studied. The results suggested that E2 could be degraded by delta-MnO2, and the oxidation reaction deviated from the pseudo-first-order kinetics at a constant pH and with an enough excess of delta-MnO2. Delta-MnO2 dosage had a positive effect on oxidative transformation of E2. When c (E2) : c (MnO2) = 1:100, the delta-MnO2 dosage was enough for E2 degradation, and the removalrate of E2 was above 90% after 8h reaction. The pH value had a negative effect on E2 degradation. When at pH 4.0, E2 concentration was decreased sharply and removal rate reached 95% after 0.25 h reaction, while E2 was disappeared by 80% at pH 6.8 and by 75% at pH 9.0 even after 1 h reaction. Two products, estrone (E1) and 2-hydroxyestradiol, were detected by gas chromatography coupled with mass spectrometry (GC-MS), and the probable transformation pathway was proposed.
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China. hc198412@163.com
Cheng
C
Huang
Li-ying
LY
Jiang
Jian-meng
JM
Chen
Xiao
X
Chen
Hong
H
Ji
D052244:Endocrine Disruptors / Q000737:chemistry / Q000302:isolation & purification; D004958:Estradiol / Q000737:chemistry* / Q000302:isolation & purification*; D017895:Manganese Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D052244:Endocrine Disruptors; D017895:Manganese Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; C505018:birnessite; D004958:Estradiol; C027424:manganese oxide