Synthesis of boron nitride nanosheets with N-defects for efficient tetracycline antibiotics adsorptive removal
Synthesis of boron nitride nanosheets with N-defects for efficient tetracycline antibiotics adsorptive removal
复制标题
具有N缺陷的氮化硼纳米片的合成用于有效吸附去除四环素抗生素
DOI：
10.1016/j.cej.2020.124138
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发表时间：
2020-05-01
影响因子：
15.1
通讯作者：
Zhu, Wenshuai
中科院分区：
文献类型：
--
作者：
Chao, Yanhong;Zhang, Jian;Zhu, Wenshuai
为了提高吸附性能而设计氮化硼的结构缺陷对于高效吸附剂的合理设计至关重要。在此，通过一步碱辅助策略原位合成了具有氮缺陷的氮化硼纳米片（BNNS）。 BNNSs框架中的N缺陷调节纳米材料的形态和电子结构，加强吸附剂和污染物之间的相互作用，从而促进抗生素的去除。密度泛函理论（DFT）计算进一步证实了N空位缺陷和四环素（TC）之间增强的吸附强度。 TC的吸附符合准二级动力学模型和Freundlich等温方程。此外，提出了缺陷BNNS异质表面上的多层吸附机制，表明吸附主要由Tc-Tc堆积相互作用主导。
Engineering structure defects in boron nitride for enhancing adsorption performance is imperative for the rational design of a high-efficient adsorbent. Herein, boron nitride nanosheets (BNNSs) with nitrogen defects were in situ synthesized via a one-step alkali-assisted strategy. N-defects in BNNSs framework tune the morphological and electronic structure of the nanomaterial, strengthening the interaction between sorbents and pollutants, and resulting in the promotion of antibiotics removal. The enhanced adsorptive strength between N vacancy defect and tetracycline (TC) were further confirmed by density functional theory (DFT) calculations. The sorption of TC was well fitted to the pseudo-second order kinetics model and Freundlich isotherm equation. In addition, a multilayer adsorption mechanism on heterogeneous surfaces of defective BNNSs was proposed, indicating that the adsorption is mainly dominated by Tc-Tc stacking interaction.