Liu Xuanwen, You Junhua, Wang Renchao, Ni Zhiyuan, Han Fei, Jin Lei, Ye Zhiqi, Fang Zhao, Guo Rui
School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China.
School of Materials Science and Engineering, Northeastern University, Shenyang, 110004, China.
Sci Rep. 2017 Oct 12;7(1):13085. doi: 10.1038/s41598-017-13544-4.
DyCuO nanoparticles with perovskite structures were synthesized via a simple solution method (SSM) and a coordination compound method (CCM) using [DyCu(3,4-pdc)(OAc)(HO)]•10.5HO (pdc = 3,4-pyridinedicarboxylic acid) as precursor. The as-prepared samples were structurally characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), x-ray photoelectron spectroscopy (XPS) and standard Brunauer-Emmett-Teller (BET) methods. Compared to the aggregated hexahedral particles prepared by SSM, the DyCuO of CCM showed hollow spherical morphology composed of nanoparticles with average diameters of 100-150 nm and a larger special surface area up to 36.5 m/g. The maximum adsorption capacity (Q ) of CCM for malachite green (MG) determined by the adsorption isotherms with different adsorbent dosages of 0.03-0.07 g, reached 5.54 g/g at room temperature. The thermodynamic parameters of adsorption process were estimated by the fittings of the isotherms at 298, 318, and 338 K, and the kinetic parameters were obtained from the time-dependent adsorption isotherms. The results revealed that the adsorption process followed a pseudo-second-order reaction. Finally, the adsorption mechanism was studied using a competitive ion (CI) experiments, and the highly efficient selective adsorption was achieved due to strong O-Cu and O-Dy coordination bonds between DyCuO and MG.
采用简单溶液法（SSM）和配位化合物法（CCM），以[DyCu(3,4 - pdc)(OAc)(HO)]•10.5HO（pdc = 3,4 - 吡啶二甲酸）为前驱体，合成了具有钙钛矿结构的DyCuO纳米颗粒。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）、X射线光电子能谱（XPS）和标准的布鲁瑙尔 - 埃米特 - 泰勒（BET）方法对所制备的样品进行结构表征。与通过简单溶液法制备的聚集六面体颗粒相比，配位化合物法制备的DyCuO呈现出由平均直径为100 - 150 nm的纳米颗粒组成的空心球形形态，且比表面积更大，高达36.5 m²/g。通过不同吸附剂用量（0.03 - 0.07 g）的吸附等温线测定，配位化合物法制备的DyCuO对孔雀石绿（MG）的最大吸附容量（Qmax）在室温下达到5.54 g/g。通过在298、318和338 K下对等温线的拟合估算吸附过程的热力学参数，并从随时间变化的吸附等温线获得动力学参数。结果表明吸附过程遵循准二级反应。最后，通过竞争离子（CI）实验研究吸附机理，由于DyCuO与MG之间存在强的O - Cu和O - Dy配位键，实现了高效的选择性吸附。
