Yao Jingjing, Deng Yi, Li Dong-Sheng, Li Haipu, Yang Hui Ying
Center for Environment and Water Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China; Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Changsha 410083, PR China; Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372 Singapore, Singapore.
Center for Environment and Water Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China.
J Colloid Interface Sci. 2023 May 15;638:872-881. doi: 10.1016/j.jcis.2023.02.036. Epub 2023 Feb 11.
Antibiotics have been considered an evolving environmental challenge in the last few decades due to their mutagenic and persistent effects. Herein, we synthesized γ-FeO and ferrites nanocomposites co-modified carbon nanotubes (γ-FeO/MFeO/CNTs, M: Co, Cu, and Mn) with high crystallinity, thermostability, and magnetization for the adsorption removal of ciprofloxacin. The experimental equilibrium adsorption capacities of ciprofloxacin on γ-FeO/MFeO/CNTs were 44.54 (Co), 41.13 (Cu), and 41.53 (Mn) mg/g, respectively. The adsorption behaviors followed the Langmuir isotherm and pseudo-first-order models. Density functional theory calculations revealed that the active sites preferentially appeared on the oxygen of the carboxyl group in ciprofloxacin, and the calculated adsorption energies of ciprofloxacin on CNTs, γ-FeO, CoFeO, CuFeO, and MnFeO were -4.82, -1.08, -2.49, -0.60, and 5.69 eV, respectively. The addition of γ-FeO changed the adsorption mechanism of ciprofloxacin on MFeO/CNTs and γ-FeO/MFeO/CNTs. CNTs and CoFeO controlled the cobalt system of γ-FeO/CoFeO/CNTs, while CNTs and γ-FeO ruled the adsorption interaction and capacity of copper and manganese systems. This work reveals the role of magnetic substances, which is beneficial to the preparation and environmental application of similar adsorbents.
在过去几十年中，由于抗生素具有致突变性和持久性影响，它们一直被视为一个不断演变的环境挑战。在此，我们合成了具有高结晶度、热稳定性和磁化强度的γ-FeO和铁氧体纳米复合材料共修饰碳纳米管（γ-FeO/MFeO/CNTs，M：Co、Cu和Mn），用于吸附去除环丙沙星。环丙沙星在γ-FeO/MFeO/CNTs上的实验平衡吸附容量分别为44.54（Co）、41.13（Cu）和41.53（Mn）mg/g。吸附行为遵循朗缪尔等温线和准一级模型。密度泛函理论计算表明，活性位点优先出现在环丙沙星羧基的氧原子上，环丙沙星在CNTs、γ-FeO、CoFeO、CuFeO和MnFeO上的计算吸附能分别为-4.82、-1.08、-2.49、-0.60和5.69 eV。γ-FeO的加入改变了环丙沙星在MFeO/CNTs和γ-FeO/MFeO/CNTs上的吸附机制。CNTs和CoFeO控制着γ-FeO/CoFeO/CNTs的钴体系，而CNTs和γ-FeO则主导着铜和锰体系的吸附相互作用和吸附容量。这项工作揭示了磁性物质的作用，这有利于类似吸附剂的制备和环境应用。
