Department of Chemistry , Lorestan University , Khoramabad 68135-465 , Iran.
Chemistry & Chemical Engineering Research Center of Iran (CCERCI) , Pajohesh Blvd., 17th km of Tehran-Karaj Highway , Tehran 14968-13151 , Iran.
Langmuir. 2019 Aug 27;35(34):11188-11199. doi: 10.1021/acs.langmuir.9b01934. Epub 2019 Aug 15.
Herein, in a new approach, highly porous alumina materials (HiPAs) have been synthesized through cetyltrimethylammonium bromide (CTAB) bloated micelles or merged CTAB/dicarboxylic acid vesicular aggregates (di-acids with 8, 10, and 12 carbon atoms) as novel templates and characterized by N sorption, low- and wide-angle XRD (X-ray diffraction), FE-SEM (field emission scanning electron microscopy), TEM (transmission electron microscopy), HR-TEM (high-resolution transmission electron microscopy), DLS (dynamic light scattering), and AFM (atomic force microscopy) analyses. In the absence of dicarboxylic acids, CTAB bloated micelles in ethanol-aqueous solutions were conductive to the formation of mesoporous γ-alumina hollow spheres (HiPA-CT) with high surface area (394 m g) and ultralarge pore volume (1.8 cm g). Notably, merged giant vesicular assemblies formed between dicarboxylic acids and CTAB endowed the mesoporous alumina nanoparticle aggregates with tunable and unprecedented pore features (surface area of 415-735 m g and ultrahigh pore volume of 1.37-2.57 cm g), in which their pinnacle was obtained via CTAB/10 (HiPA-CT-10). Due to the tailored porosity, the HiPA-CT and HiPA-CT-10 were exploited for ciprofloxacin (CIP) adsorption experiments. The adsorption efficiency attained a climax at pH 6. At CIP concentrations below 1 ppm, 91 and 86% of CIP were removed by HiPA-CT and HiPA-CT-10, respectively. The maximum adsorption capacities of HiPA-CT and HiPA-CT-10 are 120 and 184 mg g, respectively, in which the latter is surpassing those of inorganic antibiotic adsorbents reported so far. The kinetic results showed that the removal of CIP by HiPA-CT was faster due to the presence of macropores and more accessible active sites on mesoporous surfaces. The reusability test was acceptable after eight runs. The results signify that these novel materials have high potential for reducing our environmental concerns.
在此，我们采用了一种新方法，通过十六烷基三甲基溴化铵（CTAB）溶胀胶束或合并的 CTAB/二羧酸囊泡聚集体（具有 8、10 和 12 个碳原子的二羧酸）作为新型模板，合成了高多孔氧化铝材料（HiPAs），并通过氮气吸附、低角和广角 X 射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HR-TEM）、动态光散射（DLS）和原子力显微镜（AFM）分析进行了表征。在不存在二羧酸的情况下，乙醇-水溶液中的 CTAB 溶胀胶束有利于介孔γ-氧化铝空心球（HiPA-CT）的形成，其比表面积（394 m g）和超大孔体积（1.8 cm g）高。值得注意的是，二羧酸和 CTAB 之间形成的合并的巨大囊泡组装赋予了介孔氧化铝纳米颗粒聚集体可调节和前所未有的孔特征（比表面积为 415-735 m g 和超高孔体积为 1.37-2.57 cm g），其中通过 CTAB/10（HiPA-CT-10）获得了顶峰。由于定制的孔隙率，HiPA-CT 和 HiPA-CT-10 被用于环丙沙星（CIP）吸附实验。在 pH 值为 6 时，吸附效率达到峰值。在 CIP 浓度低于 1 ppm 的情况下，HiPA-CT 和 HiPA-CT-10 分别去除了 91%和 86%的 CIP。HiPA-CT 和 HiPA-CT-10 的最大吸附容量分别为 120 和 184 mg g，后者超过了迄今为止报道的无机抗生素吸附剂。动力学结果表明，由于介孔表面上存在大孔和更多可及的活性位点，HiPA-CT 对 CIP 的去除速度更快。经过八次运行后，可接受的可重复使用性测试。结果表明，这些新型材料在减少我们的环境问题方面具有很高的潜力。
