The removal of amoxicillin from wastewater using organobentonite.
The removal of amoxicillin from wastewater using organobentonite.
复制标题
DOI：
10.1016/j.jenvman.2013.08.032
复制
发表时间：
2013-11
影响因子：
8.7
通讯作者：
Shuangxing Zha;Yan Zhou;Xiao-ying Jin;Zuliang Chen
中科院分区：
文献类型：
--
作者：
Shuangxing Zha;Yan Zhou;Xiao-ying Jin;Zuliang Chen
有机膨润土具有良好的去除有机污染物的能力，本文研究了有机膨润土作为吸附剂去除废水中阿莫西林的效果。结果表明，十六烷基三甲基铵（DK 1）改性膨润土能有效去除水中的阿莫西林。批实验表明，阿莫西林到DK 1上的吸附很好地符合伪二级动力学模型，具有相应的速率常数（在20 °C下为0.0187 g/mg min）。Langmuir等温线提供了最高的吸附容量（在20 °C下为26.18 mg/g）。我们的热力学研究表明，阿莫西林到DK 1的吸附是物理吸附和吸热的性质。采用扫描电子显微镜（SEM）、比表面积（SSA）、X射线粉末衍射（XRD）和傅里叶变换红外光谱（FTIR）对DK 1进行了表征。这些表征提供了形态学性质和吸附过程如何进行的证据。吸附机理包括离子交换和分配。最后，用DK 1对阿莫西林废水进行了去除实验，结果表明，当浓度为19.0 mg/L和2.0 mg/L时，阿莫西林的去除率分别为81.9%和87.5%。
Organobentonites used as absorbents to remove amoxicillin from wastewater have been investigated here because they are effective in removing organic pollutants. It is evident that bentonite modified with hexadecyl trimethyl ammonium (DK1) can effectively remove amoxicillin from aqueous solution. Batch experiments showed that the adsorption of amoxicillin onto DK1 fitted well to a pseudo second-order kinetic model with corresponding rate constants (0.0187 g/mg min at 20 °C). The Langmuir isotherm provided the highest adsorption capacity (26.18 mg/g at 20 °C). Our thermodynamic study suggested that the adsorption of amoxicillin onto DK1 was physisorptive and endothermic in nature. Furthermore DK1 was characterized by scanning electronic microscopy (SEM), Specific Surface Area (SSA), X-ray powder diffraction (XRD) and Fourier Transform Infrared (FTIR) spectrometer. These characterizations provided evidence of the morphological properties and how well the adsorption process performed. An adsorption mechanism including both ion-exchange and partition was proposed. Finally, DK1 was used to remove amoxicillin from wastewaters and the results showed 81.9% and 87.5% of amoxicillin was removed at 19.0 mg/L and 2.0 mg/L, respectively.