【摘要】 利用两亲聚合物聚乙烯吡咯烷酮(PVP)对碳纳米管(CNTs)进行非共价修饰,考察修饰后CNTs对水中污染物亚甲基蓝的吸附。研究体系pH、离子强度、PVP加入量等各种因素对修饰后CNTs吸附亚甲基蓝的影响。结果表明,在pH=8时,PVP浓度为12mg/L时修饰后CNTs对亚甲基蓝的吸附效果最好。离子强度对吸附容量影响很小。吸附过程符合准二级动力学模型和Langmuir、Freundlich、D-R吸附等温式。由D-R等温式求得非共价修饰CNTs对亚甲基蓝平均活化能为10.08kJ/mol。PVP对CNTs的非共价修饰能够有效促进CNTs在水中的溶解和分散,增强吸附作用。更多还原

【Abstract】 The non-covalent binding of carbon nanotubes(CNTs) was carried on by using amphiphilic polymer polyvinyl pyrrolidone(PVP).The results indicated that the highest adsorption efficiency of methylene blue on the CNTs occurred at pH 8 when PVP concentration was 12mg/L,while ionic strength had less effect on the adsorbent.The experiment data fitted well by the pseudo-second-order equation and Langmuir,Freundlich,D-R isotherm models.The addition of PVP can accelerate the dissolution and distribution of CNTs in the water and enhance the adsorption consequently.更多还原