The natural layered clay-based materials offer a sustainable approach for removal of emerging pollutants from the environment. Their low-capacity and poor-selectivity for pollutants often limit their uses. This limitation is addressed in this study with the help of Al-oxide pillaring approach. Here microporous aluminum-pillared clay (Al-PILC) was prepared from locally available Smectite clay (montmorillonite, MMT), by intercalation of Al-oxide pillars into the interlayer structure. The method increased the surface area of natural clay to 258 m² g⁻¹ and its porosity to 0.16 cm³ g⁻¹. The adsorptive removal properties of prepared Al-PILC was evaluated on two selected pharmaceuticals and personal care products (PPCPs) viz. amoxicillin (AMOX) and imipramine (IMP). The results of the removal of these PPCPs were compared as a function of contact time (0–180 min), solution pH (2–12), initial concentration (0–100 mg L⁻¹), and temperature (298–318 K). The Al-PILC adsorbs 332% more IMP and 681% more AMOX as compared to natural clay, and the maximum adsorption amounts on Al-PILC follows the order IMP > AMOX with 59.8 and 7.7 mg g⁻¹, respectively. The kinetics of adsorption of both AMOX and IMP follow pseudo-second-order model, with intraparticle diffusion as rate-determining step. The incorporated acidic sites in clay (in form of Al₂O₃ pillars) enhanced its adsorption properties. These sites interacted with protonated amine and –OH groups of AMOX and the tertiary amine group of IMP. The Al-PILC exhibit effective regeneration and was reused up to three consecutive adsorption/desorption cycles. All in all, this study is expected to expand the application of Al-PILC on the adsorptive removal of the emerging pollutant from contaminated water.

中文翻译：

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通过吸附在铝柱粘土上，从水中去除药品和个人护理产品（PPCP）

天然的层状粘土基材料为从环境中去除新兴污染物提供了一种可持续的方法。它们的低容量和对污染物的选择性差通常限制了它们的使用。在这项研究中借助氧化铝支柱方法解决了这一局限性。这里，通过将氧化铝柱插入层间结构中，从当地可获得的蒙脱石粘土（蒙脱土，MMT）制备微孔铝柱状粘土（Al-PILC）。该方法使天然粘土的表面积增加至258m ²  g ^-1，并且其孔隙率增加至0.16cm ³  g ^-1。在两种选定的药物和个人护理产品（PPCP）上评估了制备的Al-PILC的吸附去除性能。阿莫西林（AMOX）和丙咪嗪（IMP）。根据接触时间（0-180分钟），溶液pH值（2-12），初始浓度（0-100 mg L ^-1）和温度（298-318 K）的函数，比较了这些PPCP的去除结果。）。与天然粘土相比，Al-PILC的IMP吸附量高332％，AMOX的吸附量高681％，Al-PILC的最大吸附量依次为IMP> AMOX ，分别为59.8和7.7 mg g ^-1。AMOX和IMP的吸附动力学均遵循伪二级模型，其中颗粒内扩散为速率确定步骤。掺入粘土中的酸性位点（以Al ₂ O _3的形式存在）支柱）增强了其吸附性能。这些位点与AMOX的质子化胺和-OH基团以及IMP的叔胺基团相互作用。Al-PILC表现出有效的再生能力，可重复使用多达三个连续的吸附/解吸循环。总而言之，这项研究有望扩大Al-PILC在吸附去除污染水中新兴污染物方面的应用。