XU Lang，SHAN Qian，ZHENG Zhiyuan，JI Shuaikun，YU Zhe，XU Jingwen，WU Wei

(School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100000, China)

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

中图分类号：TU7                              文献标志码：A

文章编号：1008-5548(2022)03-0023-10

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。