许 浪，单 倩，郑至远，季帅坤，俞 喆，徐婧雯，毋 伟
（北京化工大学 化学工程学院，北京 100000）
DOI:10.13732/j.issn.1008-5548.2022.03.004
收稿日期： 2022-02-17， 修回日期：2022-03-21，在线出版时间：2022-04-25。
基金项目：国家级大学生创新创业训练计划支持项目，编号：12040027013。
第一作者简介：许浪(2000—)，女，研究方向为氮化硼微球的制备与应用。E-mail: xulang@mail.buct.edu.cn。
通信作者简介：毋伟(1966—)，男，教授，博士，博士生导师，研究方向为纳米材料的制备。E-mail: wuwei@mail.buct.edu.cn。
摘要： 采用球磨及高速剪切法对六方氮化硼进行剥离及改性，得到六方氮化硼纳米片(BNNSs)，将 BNNSs 采用喷雾干燥技术组装成具有多孔结构的功能化六方氮化硼微球；利用SEM、TEM、BET、FTIR等技术对六方氮化硼微球进行形貌、比表面积、物相成分分析；将六方氮化硼微球用于吸附罗丹明B(RhB)，研究吸附热力学和吸附动力学模型；对比六方氮化硼微球煅烧前、后吸附性能的差异，探究吸附条件对吸附性能的影响。结果表明：功能化六方氮化硼微球由氮化硼纳米片组成，呈多孔结构，平均直径约为6 μm；BNNSs表面成功接枝氨基和羟基官能团，使得BNNSs组装成的六方氮化硼微球亲水性好，有利于对水相中RhB的吸附；当RhB质量浓度为20 mg/L时，功能化六方氮化硼微球比BNNSs的吸附性能更好，吸附容量大，且吸附速率快，吸附容量可达29.29 mg/g；吸附过程符合Langmuir等温吸附模型和拟二级动力学模型，为单分子层化学吸附，不受温度和pH的影响。
关键词： 氮化硼纳米片；功能化氮化硼微球；罗丹明B；吸附
Abstract：Functionalized boron nitride nanosheets(BNNSs) were prepared by exfoliation and modification of hexagonal boron nitride by ball milling and high speed shear, and assembled into hexagonal boron nitride microspheres with porous structure by spray drying technique. The morphology, specific surface area and phase composition of the hexagonal boron nitride microspheres were analyzed by SEM, TEM, BET and FTIR techniques. Hexagonal boron nitride microspheres were used to adsorb rhodamine B(RhB), and adsorption thermodynamics and kinetic were studied. The adsorption properties of hexagonal boron nitride microspheres before and after calcination were compared, and the effect of adsorption conditions on the adsorption properties was investigated. The results show that the prepared hexagonal boron nitride microspheres are composed of numerous nanosheets with porous structure and their average diameter is about 6 μm. The successful grafting of amino and hydroxyl functional groups on the surface of BNNSs can make the assembled boron nitride microspheres excellent hydrophilicity, which is beneficial to the adsorption of RhB in the aqueous phase. When RhB concentration is 20 mg/L, functionalized boron nitride microspheres have better adsorption performance than BNNSs, with larger adsorption capacity and faster adsorption rate, and the adsorption capacity can reach 29.29 mg/g. The adsorption process conforms to Langmuir isotherm adsorption model and pseudo-second-order kinetic model, which is a monolayer chemical adsorption, and the adsorption process is not affected by temperature and pH.
Keywords：boron nitride nanosheet; functional boron nitride microsphere; rhodamine B; adsorption
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