磁性多壁碳纳米管吸附水中硝基苯酚异构体的研究

Study on Magnetic Multi-walled Carbon Nanotubes Adsorbing Isomers of Nitrophenols in Aqueous Solutions

研究了利用磁化多壁碳纳米管(MWCNTs)吸附水中硝基苯酚三种异构体(邻硝基苯酚、间硝基苯酚和对硝基苯酚)的过程,考察了MWCNTs投加量、溶液pH值等因素对吸附过程的影响.结果表明:硝基苯酚三种异构体的吸附量随磁性MWCNTs投加量的增加而增大,并且吸附剂量增加到一定阶段后,硝基苯酚三种异构体的吸附量达到平衡.磁性MWCNTs的量为0.8,g/L,且三种异构体的初始浓度为30,mg/L时,它们在水溶液中的去除率为80%～90%左右,而且随溶液pH的增加,各异构体的去除率都呈现先增大后下降的趋势.因此,磁性MWCNTs适合对三种硝基苯酚异构体的吸附.

This paper studies the three isomers of nitrophenols in aqueous solutions（o-nitrophenol,m-nitrophenol,p-nitrophenol） adsorbed by magnetic MWCNTs,and examines the impact of the factors such as dosage of magnetic MWCNTs,adsorption time,and pH values of the aqueous solutions on the adsorption process.The results show that the re-moval of the three isomers increases and then decreases as the pH value in aqueous solutions increases.When the initial con-centration of three isomers of nitrophenols is 30 mg/L,respectively,the adsorption of o-nitrophenol,m-nitrophenol,p-nitrophenol by magnetic multi-walled carbon nanotubes has the optimum conditions： the best dosage of magnetic MWCNTs is 0.8 g/L,the pH value 6,the react time is 3 h.Under above conditions,the removal of the three isomers of ni-trophenols comes up to over 80%～90%.