Liu Xuanwen, Ni Zhiyuan, Xie Chengzhi, Wang Renchao, Guo Rui
School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, People's Republic of China.
Key Laboratory of Nano-Materials and Photoelectric Catalysis of Qinhuangdao, School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, People's Republic of China.
Nanoscale Res Lett. 2018 Sep 5;13(1):268. doi: 10.1186/s11671-018-2697-9.
Tetragonal-phase PrCuO nanosheets with a thickness of about 60 nm were synthesized using the coordination compound methods (CCMs), then used as highly efficient selective adsorbent towards malachite green (MG) in aqueous solutions. The PrCuO samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectrum (DRS), and standard Brunauer-Emmett-Teller (BET) methods. The maximum adsorption capacity (Q) of as-prepared samples was determined by adsorption isotherms with different adsorbent doses (m) of 0.03-0.07 g at 298, 318, and 338 K based on the Langmuir model. When m < 0.03 g or > 0.07 g, effects of systemic mass loss and particle aggregation were discussed on the data deviation from the Langmuir model at 298 K. Based on the hydrogen bond and coordination bond, a possible mechanism of selective adsorption of MG by PrCuO is proposed, which was further verified by the adsorption experiments of CuO and PrO towards MG and competing-ion experiments. Finally, the theoretic studies were performed at DFT level to reveal the possible adsorption process.
采用配位化合物法合成了厚度约为60nm的四方相PrCuO纳米片，然后将其用作水溶液中孔雀石绿（MG）的高效选择性吸附剂。使用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）、紫外可见漫反射光谱（DRS）和标准的布鲁诺尔-埃米特-泰勒（BET）方法对PrCuO样品进行了表征。基于朗缪尔模型，通过在298、318和338K下用0.03 - 0.07g不同吸附剂剂量（m）的吸附等温线测定了所制备样品的最大吸附容量（Q）。当m < 0.03g或> 0.07g时，讨论了在298K下系统质量损失和颗粒聚集对数据偏离朗缪尔模型的影响。基于氢键和配位键，提出了PrCuO对MG选择性吸附的可能机制，并通过CuO和PrO对MG的吸附实验以及竞争离子实验进一步验证。最后，在密度泛函理论（DFT）水平上进行了理论研究，以揭示可能的吸附过程。
