The Adsorption Study Of The Common Organic Pollutants On The Surface Of Hexagonal Boron Nitride Nanomaterials

Hexagonal boron nitride(h-BN) is an important two-dimensional nanomaterials, which has isoelectronic species. Hexagonal boron nitride also called "white graphene" because it's constitutive property. Because of its chemical inertness and structural stability, it has no toxic action to human and environment. Therefore, the hexagonal boron nitride materials has great application prospect in the pretreatment of environmental samples and the removal of organic pollutants. In this paper, h-BN and Magnetic h-BN were used as adsorbents of SPE and dSPE pretreatment technology to remove organic pollutants from environment.First, the synthesized h-BN was used as filler of solid phase extraction adsorbent, and the method for the determination of polychlorinated biphenyls in environmental water samples by SPE-GC-MS/MS analysis was established. The optimum conditions which influenced the adsorption efficiency were selected by single factor optimization method. In the optimum adsorption conditions, 7 kinds of PCBs have a good linear relationship when the concentration from 2 to 1000 ng linear L-1 through this method, and the correlation coefficient were between 0.9934 and 0.9987. The method has a low detection limit (0.24?0.50 ng L-1, S/N=3:1).The method was applied to the analysis of the actual environmental water samples included the wastewater, the local lake water, the rain water and the drinking water. The results of all the samples were showed better recoveries which were ranged from 80.1% to 108.9%. The results show that h-BN nanomaterial as the solid phase extraction column packing has great potential in the extraction of organic pollutants from environmental water samples, and the extraction performance is better than that of C18 commercial column.Then, the synthesized porous h-BN nanomaterials and magnetic porous h-BN materials were used as adsorbents to remove p-nitrotoluene,bisphenol A, phenanthrene and 1-Pyrenol four kinds of organic pollutants from water. Through the study, the adsorption kinetics of porous h-BN nanomaterials and magnetic porous h-BN materials to 4 kinds of organic pollutants were accord with pseudo-second order kinetic model, and the adsorption isotherm accords with the Langmuir adsorption isotherm model. In the process of adsorption, the Gibbs free energy which is negative, the adsorption process was spontaneous, and with the increase of temperature, the adsorbance was decreased. The adsorbance of h-BN nanomaterials and magnetic porous h-BN materials to organic pollutants were better, the h-BN nanomaterials and magnetic porous h-BN materials can be used as adsorbents to remove the organic pollutants from water.Hexagonal boron nitride nanomaterials as adsorbent for extraction PCBs in environmental samples, at the same time hexagonal boron nitride as sorbent for removal organic pollutants from environment have achieved good results. This study has important theoretical value and practical significance for using h-BN as adsorbent to remove organic pollutants from water.