Adsorption Behavior and Mechanism of Nitrogen-doped Carbon Nanotube-based Adsorbents for Boron in Brine
Boron of salt lake brine is rich in resources and exists with complex and diverse forms,so it is of great significance to separate and recover boron.N doping can effectively improve the separation mecha-nism of boron anions by the synergistic effect of strong electrostatic and polyhydroxy groups on the surface of the material.N-doped carbon nanotube boron adsorption materials(N-CNTs)were synthesized by a simple one-pot hydrothermal method using hydrazine hydrate as N source and one-dimensional carbon nanotubes(CNTs)as polyhydroxyl groups.In addition,using modified polyacrylonitrile as granulator.The maximum boron adsorption capacity is 20.45 mg/g,especially in the separation of low concentration bo-ron,which makes N-CNTs the best adsorption material for boron.The adsorption mechanism is that polyhy-droxyl groups and N-doped sites on the high specific surface area of one-dimensional carbon nanotubes and modified polyacrylonitrile are enhanced by strong electrostatic coordination adsorption.The process of bo-ron adsorption accords with Langmuir adsorption isothermal model and Second-order kinetic model,which shows excellent selective boron adsorption performance in high concentration salt multi-ion solution.The adsorption capacity of boron in East Taigener salt lake brine is 18.92±1 mg/g.The simple technology has high application potential in salt lake brine and water treatment industry.
Salt lake brineAdsorptionCarbon nanotubesBoronPolyacrylonitrile
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