Liu Boqing, Cao Jingjing, Jiang Yong, Yan Shichang, He Haiming, Shi Yu, Xu Songsong, Liang Jinhua, Ren Xiaoqian
School of Chemical Engineering, Nanjing University of Technology China.
School of Environmental Science, Nanjing Xiaozhuang University China.
RSC Adv. 2022 Sep 9;12(39):25623-25632. doi: 10.1039/d2ra03968k. eCollection 2022 Sep 5.
Polycyclic aromatic hydrocarbons (PAHs) have received extensive attention due to being highly toxic, mutagenic, and carcinogenic organic pollutants. As a result, a series of adsorbents have been designed and developed to solve the problem. In this paper, CuZnFeAl-S has been explored as a highly efficient adsorbent for PAHs. First, CuZnFeAl-LDH was prepared using a coprecipitation method and then calcined at 500 °C to obtain CuZnFeAlO. Finally, CuZnFeAl-S was prepared by modifying CuZnFeAlO with sodium dodecyl sulfate (SDS). The physical and chemical properties of the adsorbents were characterized by XRD, N adsorption-desorption, SEM, ICP, FT-IR, TG-DSC, and IGC; subsequently their adsorption performance was investigated. The results show that the surface properties of CuZnFeAl-S changed from hydrophilic to hydrophobic after SDS modification, which enhanced the adsorption of PAHs obviously. The removal of naphthalene and phenanthrene on CuZnFeAl-S reached 97.3% and 90.3%, respectively. And the adsorption process of naphthalene and phenanthrene conforms to Langmuir adsorption and Freundlich adsorption, respectively. Besides, the adsorption thermodynamics indicate that the adsorption of PAHs was a spontaneous exothermic reaction. The highly efficient PAH adsorption performance of CuZnFeAl-S is the synergistic result of various molecule interactions, such as hydrogen bonding, π-π interactions, and electrostatic attraction.
多环芳烃（PAHs）由于是剧毒、致突变和致癌的有机污染物而受到广泛关注。因此，人们设计并开发了一系列吸附剂来解决该问题。本文中，CuZnFeAl-S已被探索作为一种高效的PAHs吸附剂。首先，采用共沉淀法制备CuZnFeAl-LDH，然后在500℃下煅烧得到CuZnFeAlO。最后，通过用十二烷基硫酸钠（SDS）对CuZnFeAlO进行改性制备了CuZnFeAl-S。采用XRD、N吸附-脱附、SEM、ICP、FT-IR、TG-DSC和IGC对吸附剂的物理和化学性质进行了表征；随后研究了它们的吸附性能。结果表明，经SDS改性后，CuZnFeAl-S的表面性质从亲水性变为疏水性，这明显增强了对PAHs的吸附。CuZnFeAl-S对萘和菲的去除率分别达到97.3%和90.3%。并且萘和菲的吸附过程分别符合Langmuir吸附和Freundlich吸附。此外，吸附热力学表明PAHs的吸附是一个自发的放热反应。CuZnFeAl-S对PAHs的高效吸附性能是氢键、π-π相互作用和静电吸引等多种分子间相互作用的协同结果。
