School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China; Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology, Tianjin 300130, PR China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China; Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology, Tianjin 300130, PR China.
J Hazard Mater. 2019 Feb 15;364:654-662. doi: 10.1016/j.jhazmat.2018.10.054. Epub 2018 Oct 23.
The novel hexagonal boron nitride (BN) bundles, assembled by a plenty of BN fibers with high adsorption capacity and outstanding recyclability, were prepared easily as an efficient adsorbent for antibiotics. It is an excellent substitute for carbonaceous adsorbent to overcome the shortcoming in low adsorption capacity and poor recyclability. Its high surface area can reach up to 871.456 m g. The adsorption capacity and removal percentage to sulfadiazine (SDZ, 0.328 mmol g, 82.192%), oxytetracycline (OTC, 0.202 mmol g, 92.890%) and erythromycin (EM, 0.126 mmol g, 90.140%) are superior compared with activated carbon and graphene nanoplatelets. It is interesting that BN bundles have a better adsorption to small molecules since huge molecules are easily restricted to enter the micropores, which was defined as micropore-filling effect. Moreover, the adsorption isotherms are well fitted by the Langmuir and Tempkin model, while pseudo-second-order model can better describe the adsorption kinetics. The adsorption mechanisms were deduced to be mainly π-π electron-donor-accepter interaction while electrostatic force and hydrophobic interaction played a significant role. The excellent reusability can be seen from the high removal efficiency after five recycles suggesting the BN bundles was a promising adsorbent for the efficient removal of antibiotics pollutants.
新型六方氮化硼（BN）束，由大量 BN 纤维组装而成，具有高吸附能力和出色的可回收性，很容易被制备成一种用于抗生素的高效吸附剂。它是碳质吸附剂的优良替代品，可以克服吸附容量低和可回收性差的缺点。其高比表面积可达 871.456 m2/g。其对磺胺嘧啶（SDZ，0.328 mmol g，82.192%）、土霉素（OTC，0.202 mmol g，92.890%）和红霉素（EM，0.126 mmol g，90.140%）的吸附容量和去除率均优于活性炭和石墨烯纳米片。有趣的是，BN 束对小分子具有更好的吸附能力，因为大分子很容易受到限制而无法进入微孔，这被定义为微孔填充效应。此外，吸附等温线很好地符合朗缪尔和Tempkin 模型，而准二级模型可以更好地描述吸附动力学。吸附机制主要归因于π-π电子供体-受体相互作用，而静电力和疏水相互作用也起着重要作用。从五次循环后的高去除效率可以看出，其具有优异的可重复使用性，这表明 BN 束是一种很有前途的用于有效去除抗生素污染物的吸附剂。
