Sonochemical degradation of endocrine disruptor propylparaben in pure water, natural water, and seawater
Sonochemical degradation of endocrine disruptor propylparaben in pure water, natural water, and seawater
复制标题
DOI：
10.1080/19443994.2016.1177600
复制
发表时间：
2016-12-01
影响因子：
1.1
通讯作者：
Petrier, Christian
中科院分区：
文献类型：
--
作者：
Boutemedjet, Siham;Hamdaoui, Oualid;Petrier, Christian
本研究采用超声降解技术，在352 kHz、80 W的频率下，对内分泌干扰物对羟基苯甲酸丙酯（PPB）进行降解。考察了底物初始浓度和溶液初始pH值对PPB超声降解的影响。此外，在天然水和海水中研究了声化学降解基质。在pH值为3-8的范围内，降解率最高，而随着溶液pH值从8增加到10.5，降解率下降。所得到的结果显示了一个有趣的效果的真实的水矩阵。在低浓度PPB（5 mg/L）下，天然基质中的降解过程有所改善，而在高浓度PPB（25100 mg/L）下，降解受到轻微抑制，尤其是在天然水体中。在PPB的中等浓度（10 mg/L）下，所有供试培养基的降解速率相似。Langmuir型动力学模型能很好地拟合底物的超声降解。一个完美的代表性的PPB声化学降解的实验数据在不同的初始浓度在纯水中，获得使用Sercadian等人。的模型。在真实的水基质中，Okitsu等人充分描述了PPB的超声破坏。的方程。这些结果表明，PPB在天然水和海水中主要发生在气泡/溶液界面处的降解，而在纯水中，基质的超声降解主要在气泡/溶液界面和本体溶液中实现。
In this work, the sonolytic degradation of an endocrine disrupting chemical, propylparaben (PPB), was carried out at 352kHz and 80W. The effects of initial substrate concentration and initial solution pH on the ultrasonic degradation of PPB were examined. Additionally, sonochemical degradation of substrate was investigated in natural water and seawater. The best performances were achieved in the pH range of 3-8, whereas the degradation rate decreased with increasing solution pH from 8 to 10.5. The obtained results showed an interesting effect of real water matrices. At a low concentration of PPB (5mg/L), an improvement in the degradation process was observed in natural matrices, while at higher concentrations of PPB (25100mg/L), degradation was slightly inhibited, particularly in natural water. At a medium concentration of PPB (10mg/L), similar degradation rates were observed for all the tested media. The Langmuir-type kinetic models fit well the substrate sonolytic degradation. A perfect representation of the experimental data of PPB sonochemical degradation at different initial concentrations in pure water was obtained using the Serpone et al.'s model. In real water matrices, an adequate description of the sonolytic destruction of PPB was attained by the Okitsu et al.'s equation. These results indicate that PPB undergoes degradation predominantly at the bubble/solution interface in natural water and seawater, whereas the sonolytic destruction of substrate in pure water is mainly achieved both at bubble/solution interface and in the bulk solution.