改性多孔碳微球的制备及去除水中四溴双酚A的性能

Preparation of modified porous carbon microspheres and performance of removing TBBPA from water

为提高多孔碳微球对TBBPA的去除性能,采用氮掺杂、H_(2)O_(2)氧化和球磨对多孔碳微球进行表面改性,运用比表面积及孔隙度分析仪、傅里叶红外光谱(FT-IR)和X射线衍射仪(XPS)等方法表征改性前后多孔碳微球形貌、孔隙特征、官能团种类及含量和热稳定性等变化情况,通过吸附实验确定多孔碳微球的最佳改性方法,并探究吸附机理.结果表明,多孔碳微球、C-N、C-H_(2)O_(2)和C-球磨对TBBPA的最大吸附量分别为36.6、43.1、47.4、58.35 mg·g^(-1).吸附过程符合准二级动力学模型,Langmuir模型能够更好的描述多孔碳微球对TBBPA的吸附过程,主要为单分子层均匀化学吸附.其中C-球磨对TBBPA的吸附性能最佳,最大吸附量和吸附速率分别提高了1.6倍和2.9倍;球磨改性极大提高了碳材料的比表面积和含氧官能团,增加了吸附污染物的活性位点,强化了氢键和π-π电子供受体作用,且受pH和腐殖酸(HA)的影响较小,拓宽了环境适用范围.本研究以期为廉价碳材料去除有机污染物性能提供理论依据.

In order to improve the removal performance of porous carbon microspheres for TBBPA,nitrogen doping,H_(2)O_(2) oxidation and ball milling were used to modify the surface of porous carbon microspheres.Specific surface area and porosity analyzer,Fourier infrared spectroscopy(FT-IR)were used.And X-ray diffractometer(XPS)methods to characterize the changes of porous carbon microsphere morphology,pore characteristics,functional group type and content,and thermal stability before and after modification,and determine the best modification method for porous carbon microspheres through adsorption experiments,And explore the adsorption mechanism.The results showed that the maximum adsorption capacity of porous carbon microspheres,C-N,C-H_(2)O_(2) and C-ball mills for TBBPA were 36.6 mg·g^(-1),43.1 mg·g^(-1),47.4 mg·g^(-1),and 58.35 mg·g^(-1),respectively.The adsorption process conforms to the second-order kinetic model.The Langmuir model can better describe the adsorption process of TBBPA by porous carbon microspheres,which is mainly a uniform adsorption of monolayers.Among them,C-Ball Mill has the best adsorption performance for TBBPA,and the maximum adsorption capacity and adsorption rate are increased by 1.6 times and 2.9times respectively.Ball mill modification greatly increases the specific surface area and oxygencontaining functional groups of carbon materials,and increases the adsorption of pollutants.The active site strengthens the role of hydrogen bond and π-π electron donor and acceptor,and is less affected by pH and humic acid(HA),which broadens the scope of environmental application.This research aims to provide a theoretical basis for the removal of organic pollutants by cheap carbon materials.