School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
J Environ Manage. 2013 Nov 15;129:569-76. doi: 10.1016/j.jenvman.2013.08.032. Epub 2013 Sep 10.
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.
有机膨润土作为吸附剂被用于去除废水中的阿莫西林，因为它们在去除有机污染物方面非常有效。显然，十六烷基三甲基溴化铵（DK1）改性膨润土可以有效地从水溶液中去除阿莫西林。批量实验表明，阿莫西林在 DK1 上的吸附很好地符合拟二级动力学模型，相应的速率常数为（20°C 时为 0.0187 g/mg min）。Langmuir 等温线提供了最高的吸附容量（20°C 时为 26.18mg/g）。我们的热力学研究表明，阿莫西林在 DK1 上的吸附是物理吸附和吸热的。此外，通过扫描电子显微镜（SEM）、比表面积（SSA）、X 射线粉末衍射（XRD）和傅里叶变换红外（FTIR）光谱仪对 DK1 进行了表征。这些表征提供了形态特性和吸附过程性能的证据。提出了一种包括离子交换和分配在内的吸附机制。最后，DK1 被用于从废水中去除阿莫西林，结果表明在 19.0mg/L 和 2.0mg/L 时，阿莫西林的去除率分别为 81.9%和 87.5%。
