| With rapid industrial development and population growth,water pollution has posed a serious challenge to mankind.Dye is one of the most common water pollutants,and it can cause great harm to human.Hence,the removal of dye from water has been a hot topic in research and industry.However,it is difficult to remove dye from aqueous solution due to the excellent solubility and stability of dye.Therefore,materials,which can efficiently adsorb and remove dye from water,are highly desired.Carbon nanotube（CNT）has attracted much attention due to its porosity and high specific surface area,but the hydrophobicity and easy agglomeration of the surface limit its adsorption performance.In order to improve the adsorption capacity of CNT for dye,CNT with different oxygen-containing functional groups on the surface were prepared by dielectric barrier discharge（DBD）plasma in this paper.The equilibrium adsorption time plasma-modified CNT was significantly reduced with a maximum adsorption capacity of 80.33 mg g-1.This may be related to surface-containing functional groups.The characterization of EDS,FTIR,XPS and contact angle confirmed that a great variety of oxygen-containing functional groups could be successfully introduced into the surface of modified carbon CNT.Meanwhile,we explored the adsorption mechanism and density functional theory（DFT）of the modified CNT,which mainly achieved the removal and adsorption of dye through interactions such as hydrogen bonding,electrostatics andπ-πstacking.These problems hinder the further reuse and practical application of the modified CNT due to its difficult separation from water and limited adsorption capacity.On this basis,we propose to dope modified CNT into aerogel to prepare a three-dimensional network structure of CNT aerogel[CNT/P（AM-AA）].The material characterization demonstrated that the doping of CNT significantly enhanced the thermodynamic properties of aerogel.The adsorption experiments showed that the removal efficiency of CNT/P（AM-AA）aerogel for methylene bule reached 95%with a maximum adsorption of 558.7 mg g-1,and the removal rate remained basically the same after 5 cycles of regeneration.The dye absorption process mainly follows the pseudo-second-order kinetic model and Langmuir isotherm model,and the CNT/P（AM-AA）aerogel adsorption process is spontaneously exothermic.Meanwhile,it has highly selective adsorption to cationic dye in aqueous solution.This will provide a broad application prospect in the future treatment of dye wastewater,making it possible to prepare nanocomposite aerogel with good microstructure. |
