Water & Environmental Technology (WET) Center, Department of Civil and Environmental Engineering, Temple University, Philadelphia, Pennsylvania 19122, USA.
Environ Sci Technol. 2010 Feb 15;44(4):1373-9. doi: 10.1021/es9024595.
Ultrasound assisted degradation of estrogen hormones was examined in a batch reactor using a 2 kW (20 kHz) sonication unit. The degradation of estrogens follow a pseudo first order rate kinetics, and the order of degradation is 17alpha-dihydroequilin > equilin >17alpha-ethinyl estradiol >17alpha-estradiol >17beta-estradiol > estrone > estriol. Effect of solution alkalinity and salinity on the sonochemical degradation of estrogen hormones is examined. At alkalinity concentration of 10 mM, no adverse effect on the degradation rate constants of estradiols (17alpha-estradiol, 17beta-estradiol, and 17alpha-ethinyl estradiol) was observed, whereas equilin compounds showed a decrease in their degradation rate constants. Significant inhibitory effects were observed for all the compounds at high alkalinity concentration of 120 mM and which could be due to the scavenging of OH(*) radicals in the bulk solution. The presence of salinity (0.17 M) enhanced the estrogen degradation except for the equilin compounds. Simultaneous presence of high alkalinity (120 mM) and salinity (0.17 M) also increased the degradation of estrogen hormones than the case when only alkalinity (120 mM) was present, indicating the diffusion of analytes to the cavity interface where most of the degradation occurs under these conditions. A mechanistic approach was used to model the degradation behavior of estrogen hormones under different solution alkalinity and salinity conditions.
采用 2kW（20kHz）超声装置在间歇式反应器中研究了超声波促进的雌激素降解。雌激素的降解遵循拟一级动力学，降解顺序为 17α-二氢-equilin>equilin>17α-乙炔基雌二醇>17α-雌二醇>17β-雌二醇>雌酮>雌三醇。考察了溶液碱度和盐度对雌激素类化合物超声降解的影响。在碱度浓度为 10mM 时，雌二醇（17α-雌二醇、17β-雌二醇和 17α-乙炔基雌二醇）的降解速率常数没有受到不利影响，而 equilin 类化合物的降解速率常数则下降。在高碱度浓度 120mM 时，所有化合物都表现出显著的抑制作用，这可能是由于在体相溶液中 OH(*）自由基的清除。在 0.17M 的盐度存在下，除了 equilin 类化合物外，雌激素的降解都得到了增强。同时存在高碱度（120mM）和盐度（0.17M）也比仅存在碱度（120mM）时增加了雌激素类化合物的降解，这表明在这些条件下，分析物向腔界面扩散，大部分降解发生在该界面。采用一种机理方法对不同溶液碱度和盐度条件下雌激素类化合物的降解行为进行了建模。
