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首页> 美国卫生研究院文献>Materials >The Triple Mechanisms of Atenolol Adsorption on Ca-Montmorillonite: Implication in Pharmaceutical Wastewater Treatment
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The Triple Mechanisms of Atenolol Adsorption on Ca-Montmorillonite: Implication in Pharmaceutical Wastewater Treatment

机译：阿替洛尔在蒙脱土上吸附的三重机理：对制药废水的处理意义

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The adsorption of atenolol (AT) from aqueous solutions by Ca-montmorillonite (SAz-2) was investigated in batch studies under different physicochemical conditions. The AT existed in neutral un-dissociated form at pH 10, and was adsorbed on dioctahedral smectite (SAz-2) obeying the Langmuir isotherm with a maximum adsorption capacity of 330 mmol/kg. The kinetic adsorption suggested that both strong and weak adsorption sites existed on SAz-2 and participated in the adsorption mechanisms. The amount of exchangeable cations desorbed from SAz-2 during AT adsorption was linearly correlated with the amounts of adsorbed AT having slopes of 0.43, which implied that a cation exchange based adsorption mechanism was also in place. A comprehensive basal spacing change of SAz-2 was observed after AT adsorption on the clay mineral when tested with or without AT recrystallization. The intercalation of AT into the SAz-2 interlayers did not result in swelling due to the low adsorption capacity of the drug. Prominent interactions between the pharmaceutical molecule and SAz-2 were evidenced by apparent shifts of the infrared absorption bands after adsorption. The interlayer configurations and hydrogen bonding of AT on SAz-2 were also supported by infrared, X-ray diffraction and thermogravimetric analyses. This study suggested that SAz-2 is an excellent material to remove not only AT from pharmaceutical wastewater, but can potentially remove many other β-receptor blocker drugs. The results helped us to understand the possible interlayer configurations and adsorption mechanisms of the drugs on natural clay mineral based adsorbents.
机译：在不同的理化条件下分批研究了钙蒙脱石（SAz-2）对水溶液中阿替洛尔（AT）的吸附。 AT以pH值为10的中性未离解形式存在，并吸附在八面体蒙脱石（SAz-2）上，遵守Langmuir等温线，最大吸附容量为330 mmol / kg。动力学吸附表明，SAz-2上同时存在强吸附位和弱吸附位，并参与了吸附机理。在AT吸附过程中从SAz-2解吸的可交换阳离子量与具有0.43斜率的AT吸附量线性相关，这表明基于阳离子交换的吸附机理也已到位。在有或没有AT重结晶的情况下，AT吸附在粘土矿物上后，观察到SAz-2的基础间距发生了全面变化。由于药物的低吸附能力，将AT插入SAz-2中间层不会导致溶胀。吸附后红外吸收带的明显移动证明了药物分子与SAz-2之间的显着相互作用。红外，X射线衍射和热重分析也支持了AT在SAz-2上的层间构型和氢键。这项研究表明，SAz-2是一种出色的材料，不仅可以去除制药废水中的AT，而且可以潜在地去除许多其他β受体阻滞剂。结果帮助我们了解了药物在天然粘土矿物基吸附剂上可能的中间层构型和吸附机理。

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