Visible Light Response Of Boron Nitride Based Photocatalytic Composites:Synthesis And Performance Research

Today,process of global industrilization is rapidly increasing and the subsequent environment pollution especially water pollution is more serious,leading a great threat to human health.Providing adequate safe drinking water becomes a challenge which was faced by glowbal governments.Among various methods,adsorption is one of simplest and most effective method in removal contaminants from water.However,adsorption can only transfer the contaminants and easy to cause secondry pollution.Semiconductor photocatalytic technology can degrade pollutants in water under the sunlight.This method is simple,environmental protection,energy saving but low efficiency.The adsorption and photocatalytic synergy is a good method to remove water pollutant.This study was mainly focous following jobs:?1?Porous boron nitride coupled with CdS in removing RhB from waterPorous boron nitride modified by uniformly dispersed CdS photocatalysts were successfully prepared using the facile hydrothermal method.The results show that adding a small amount of CdS nanoparticles will significantly affect the adsorption performance of porous boron nitride.With the increase of CdS,the adsorption performance of composites decrease seriously.The optimal loading amount of CdS was observed to be 0.5 wt%with the best adsorption-photocatalytic synertistic efficiency.And the existence of porous boron nitride is positive for improving the stability of CdS.?2?Studying g-C₃N₄/BN composites in removing RhB from waterBased on adsorption-photocatalytic synertistic efficiency,we chose another photocatalyst which own more excellent property.We got g-C₃N₄ modified porous BN composites.We got g-C₃N₄ by calcining melamine in N₂ atmosphere.Mixing g-C₃N₄ with porous BN together after ultrasonic,stirring and post-processing,we obtained g-C₃N₄/BN composites.We searched its adsorption-photocatalytic synergetic activity through decomposition of high concentration organic pollutants under visible light illumination.The results show that after coupling with g-C₃N₄,the adsorption activity of porous BN decreased remarkably.The optimal loading amount of g-C₃N₄ was 10 wt%with the best adsorption-photocatalytic synertistic efficiency in removing RhB from water.And 10%g-CN-BN composites still performed well in removal RhB from water after 4 recycle.Its an ideal photocatalyst.?3?Porous BN modified g-C3N4 photocatalysts with photocatalytic degradation of RhB in waterThis part mainly focus on the effect that a small content porous boron nitride modified g-C3N4 in decomposition low concentration RhB in water under visible light.We got porous BN modified g-C3N4 composites through g-C3N4 and porous BN were stirring in ethanol.After testing its photocatalytic activity,we found small porous BN modified g-C3N4 can increase its own photocatalytic performance of decomposition RhB in water under visible light.