School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, PR China.
School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, PR China.
Environ Pollut. 2019 Nov;254(Pt B):113005. doi: 10.1016/j.envpol.2019.113005. Epub 2019 Aug 13.
Norfloxacin (NOR) is a persistent organic pollutant and can be effectively removed from effluent by adsorption of biochar. However, the presence of other emerging contaminants, such as surfactants, will potentially alter adsorption performance of norfloxacin by biochar and the molecular-scale mechanisms of the interaction between surfactants and biochar remain poorly understood. In this study, adsorption of norfloxacin on magnetic biochar prepared with iron-containing furfural residue (FRMB) in the presence or absence of anionic surfactants was investigated. The adsorption of NOR was significantly affected by the initial pH and anionic surfactants-sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (SDBS). In the presence of SDS and SDBS, the maximum sorption capacities of NOR were 2.33 and 1.97 times higher than that in the absence of surfactants, reached to 698.6 mg g and 589.9 mg g, respectively. The optimal pH condition which was 4 indicated that electrostatic adsorption played a decisive role in the adsorption process after introduction of SDS/SDBS. The adsorption data were fitted well by the Elovich model and Freundlich model at the optimal conditions in which both SDS and SDBS were hemimicelle (0.8 mM SDS or 0.4 mM SDBS), indicating surface heterogeneity of FRMB and the adsorption mechanism was related to the assembly of surfactants on biochar. FTIR results showed that FRMB and SDS/SDBS interacted through hydrophobic action, and more complex or aggregates were formed between the NOR and biochar/SDS/SDBS. This work highlights the synergistic enhancement effects of tested surfactants on the removal of NOR by magnetic biochar from aqueous systems.
诺氟沙星（NOR）是一种持久性有机污染物，可通过生物炭吸附有效地从废水中去除。然而，其他新兴污染物（如表面活性剂）的存在可能会改变生物炭对诺氟沙星的吸附性能，并且对于表面活性剂和生物炭之间的相互作用的分子尺度机制仍了解甚少。在这项研究中，研究了在存在或不存在阴离子表面活性剂（十二烷基硫酸钠（SDS）和十二烷基苯磺酸钠（SDBS））的情况下，磁性生物炭对呋喃甲醛残渣（FRMB）制备的铁的诺氟沙星的吸附。NOR 的吸附受初始 pH 和阴离子表面活性剂（十二烷基硫酸钠（SDS）和十二烷基苯磺酸钠（SDBS））的显著影响。在 SDS 和 SDBS 的存在下，NOR 的最大吸附容量比无表面活性剂时分别高 2.33 和 1.97 倍，达到 698.6 mg/g 和 589.9 mg/g。最佳 pH 条件为 4，表明在引入 SDS/SDBS 后，静电吸附在吸附过程中起决定性作用。在最佳条件下（SDS 为 0.8 mM 或 SDBS 为 0.4 mM 时均为半胶束），吸附数据均通过 Elovich 模型和 Freundlich 模型拟合良好，表明 FRMB 的表面不均匀性，吸附机制与表面活性剂在生物炭上的组装有关。FTIR 结果表明，FRMB 和 SDS/SDBS 通过疏水相互作用相互作用，并且 NOR 与生物炭/SDS/SDBS 之间形成了更复杂或聚集物。这项工作突出了测试的表面活性剂对从水系统中去除 NOR 的磁性生物炭的协同增强作用。
