Advanced Overlap Adsorption Model of Few-Layer Boron Nitride for Aromatic Organic Pollutants
Advanced Overlap Adsorption Model of Few-Layer Boron Nitride for Aromatic Organic Pollutants
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少层氮化硼对芳香族有机污染物的先进重叠吸附模型
DOI：
10.1021/acs.iecr.7b05092
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发表时间：
2018
影响因子：
4.2
通讯作者：
Li Huaming
中科院分区：
文献类型：
--
作者：
Chang Honghong;Chao Yanhong;Pang Jingyu;Li Hongping;Lu Linjie;He Minqiang;Chen Guangying;Zhu Wenshuai;Li Huaming
设计具有高表面积的重叠相互作用吸附剂已成为增强吸附性能的有趣方法。制备了具有556 m2 g-1比表面积的二维少层石墨烯状氮化硼（g-BN），并将其用于芳香族有机污染物亚甲基蓝（MB）和罗丹明B（Rh B）的π-π重叠吸附。研究了吸附接触时间、温度、pH、动力学、等温线和热力学。准二级动力学模型与实验数据拟合良好，等温数据显示更好的拟合与Freundlich模型。实验结果表明，g-BN对MB和RhB的平衡吸附容量较高，分别为522和488 mg g-1。热力学参数表明吸附过程是自发的放热过程。基于密度泛函理论（DFT），吸附机理可能是以π-π堆积相互作用为主，并具有重叠形式，这一点得到了XRD、FTIR和Freundlich等温线的证实。这些结果表明g-BN是一种理想的去除废水中芳香族有机污染物的吸附剂。
Designing overlap interaction adsorbents with high surface area has emerged as an intriguing method to enhance adsorption performance. Herein, a two-dimensional (2D) few-layer graphene-like boron nitride (g-BN) with 556 m2g–1surface area was successfully prepared and employed in the adsorption of aromatic organic pollutants methylene blue (MB) and rhodamine B (RhB) via π–π overlap interaction. The adsorption contact time, temperature, pH, kinetics, isotherms, and thermodynamics were investigated. The pseudo-second-order kinetic model fitted well with experimental data and isothermal data displayed better fit with the Freundlich model. The experimental results showed that the equilibrium adsorption capacity ofg-BN for MB and RhB was high, 522 and 488 mg g–1, respectively. The thermodynamic parameters suggested that the adsorption processes were spontaneous and exothermic. Based on the density functional theory (DFT), the adsorption mechanism was probably dominated by π–π stacking interaction with overlap form, which was confirmed by the XRD, FTIR, and Freundlich isotherm. These findings displayed thatg-BN was a desirable adsorbent for removing aromatic organic pollutants from wastewater.