Chao Yanhong, Tang Baichuan, Luo Jing, Wu Peiwen, Tao Duanjian, Chang Honghong, Chu Xiaozhong, Huang Yan, Li Hongping, Zhu Wenshuai
School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China; School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China.
J Colloid Interface Sci. 2021 Feb 15;584:154-163. doi: 10.1016/j.jcis.2020.09.075. Epub 2020 Sep 25.
Designing atomically defective adsorbents with high specific surface area has emerged as a promising approach to improve sorption properties. Herein, hierarchical porous boron nitride nanosheets with boron vacancies (Bv-BNNSs) were in-situ synthesized via a one-step ZnCl-assisted strategy. Being benefitted from the dual-functional template of zinc salt, highly-active boron vacancies and abundant hierarchical pores were simultaneously generated in the Bv-BNNSs framework. By employing the boron vacancies engineering strategy, the morphological and electronic structures were controllably tuned. Meanwhile, the specific surface area was improved to as high as 1104 m/g. Owning to the abundance of accessible surface active-sites, the sorption capacity to antibiotic tetracycline (TC) on Bv-BNNSs was boosted by 38% compared to the pristine boron nitride nanosheets (BNNSs). Detailed fitting results showed that TC sorption on Bv-BNNSs obeyed the pseudo-second order kinetic equation and the Freundlich isotherm model. The pi - pi interaction with a multi-layered stacking form was proposed as the dominated sorption mechanism. Furthermore, DFT calculations verified that the interaction energy between Bv-BNNSs and TC was enhanced. The high activity, excellent selectivity, and remarkable durability of the Bv-BNNSs nanomaterial suggest the great potential in practical wastewater treatment.
设计具有高比表面积的原子缺陷吸附剂已成为一种有前景的改善吸附性能的方法。在此，通过一步法ZnCl辅助策略原位合成了具有硼空位的分级多孔氮化硼纳米片（Bv-BNNSs）。受益于锌盐的双功能模板，在Bv-BNNSs框架中同时产生了高活性硼空位和丰富的分级孔隙。通过采用硼空位工程策略，可控地调节了其形态和电子结构。同时，比表面积提高到高达1104 m/g。由于存在大量可及的表面活性位点，与原始氮化硼纳米片（BNNSs）相比，Bv-BNNSs对四环素（TC）的吸附容量提高了38%。详细的拟合结果表明，TC在Bv-BNNSs上的吸附服从准二级动力学方程和Freundlich等温线模型。提出以多层堆积形式的π-π相互作用作为主要吸附机制。此外，DFT计算证实了Bv-BNNSs与TC之间的相互作用能增强。Bv-BNNSs纳米材料的高活性、优异的选择性和显著的耐久性表明其在实际废水处理中具有巨大潜力。
