Study On The Properties Of Boron Nitride Nanofilament And Its Composites Removal Of Heavy Metal Ions

This thesis mainly studies the adsorption removal effect and mechanism of porous Six boron nitride(h-BN)to Ni(?),Cd(?)and U(?)in aqueous solution.In a nitrogen atmosphere,a multi-hole h-BN nanomaterial is modified by load nano Ferrous sulfide(FeS)particles,and the porous h-BN@FeS is used as The adsorbent material is studied to remove the removal effect and mechanism of Cr(VI)in aqueous solution.The materials before and after adsorption were characterized by SEM-EDS,TEM,XRD,BET,XPS,and FTIR,etc.,and studied the adsorption effect of porous h-BN and its composites on heavy metal ions and their mechanisms.The main research results of this thesis are as follows:(1)Exploring the influencing factors of Multi-hole h-BN removal Ni(?)and Cd(II)by static adsorption experiments.The results show that the removal rate of porous h-BN to Ni(?)and Cd(?)increases with the initial pH of the solution,the adsorbent concentration,and the temperature increase;through the Zeta potential test,it is known to be greater than 2.56.The potential of the surface of the h-BN nanchi is negative,the adsorbent indicates the negative charge,which is conducive to the adsorption of the regular heavy metal ions;the experimental data is fitted to the experimental data by adsorbing the isotherm model and the kinetic model,porous HBN's adsorption process of Ni(?)and Cd(?)compared to FreundLich isothermal adsorption model and compared to pseudo-secondary dynamics model;XPS and FTIR analysis indicated that h-BN adsorption Ni(?)and Cd(?)the possible mechanism of adsorption is to chelate and attract metal through surface chemical bonds such as B-O buttons and-NH2 and heavy metal ions.EDS and XPS analysis show that Ni(?)and Cd(?)were successfully adsorbed on the porous h-BN material.(2)Exploring the adsorption process of U(?)on the porous h-BN,the change before and after the characterization method of XRD,SEM,TEM,BET,FTIR,XPS,and HRTEM is studied.The results show that the porous h-BN has strong alkaline and a certain buffering ability,and a large amount of UO3 precipitated crystals are observed on the surface of the porous h-BN surface when the solution pH=2.86;indicating that the temperature is indicated by dynamics and thermodynamics Elevation is conducive to the adsorption process,and the adsorption process of the porous h-BN to U(?)cannot be combined with a single adsorption model such as electrostatic attraction or chemical adsorption,which means that this adsorption process is a relatively complex compound process.(3)Exploring the process of adsorbing Cr(?)by multi-hole h-BN@FeS nanomaterials,using adsorption kinetic model and isotherm model to fit the experimental data,through SEM-EDS,TEM,FTIR,XPS and XRD and other methods for characterization analysis of porous h-BN@FeS before and after adsorption.The results show that the adsorption process of porous h-BN@FeS is compared to the pseudo-secondary kinetic model;increase the amount of porous h-BN@FeS,reducing the initial pH and Cr(?)of the solution.The concentration is conducive to improving the reaction rate;The removal process of Cr(?)from solution by porous h-BN@FeS composites mainly includes reduction,co-precipitation and adsorption.