偕胺肟基改性碳纳米管对铀的吸附性能研究

对多壁碳纳米管（MWNTs）进行偕胺肟基改性，采用透射电子显微镜（TEM）和傅里叶变换红外光谱仪（FTIR）进行表征，研究了改性前后MWNTs在不同条件下对铀的吸附性能。结果表明，在pH=2～8的范围内，未改性的碳纳米管（raw-MWNTs）与偕胺肟基改性碳纳米管（AO-MWNTs）对铀的吸附容量均是先增大后降低，pH值为5时达到最大。随着铀初始浓度的增大，raw-MWNTs和AO-MWNTs对铀的吸附容量逐渐升高。当铀初始浓度为10 mg/L时，AO-MWNTs对铀振荡吸附30 min后达到平衡，吸附容量可达18.93 mg/g，而raw-MWNTs对铀振荡吸附60 min后趋于稳定，吸附容量可达9.59 mg/g。AO-MWNTs对铀的吸附符合Langmuir和Freundlich模型，最大理论吸附容量为106.38 mg/g。

Removal of Uranium by Adsorption of Amidoxime Group Modified Carbon Nanotubes

AO‐MWNTs were obtained through multi‐walled carbon nanotubes (MWNTs ) modified by amidoxime group ,and characterized by transmission electron microscope (TEM) and fourier transform infrared spectrometer (FTIR) .The adsorption experi‐ments of uranium on the raw‐MWNTs and AO‐MWNTs were studied under different conditions .The results show that the adsorption capacities of uranium on raw‐MWNTs and AO‐MWNTs primarily increase and then decrease over the range of pH =2‐8 ,and reach the maximum at pH=5 .With the increase of initial concentration of uranium ,the adsorption capacities of uranium on the two materials gradually increase . When the initial concentration of uranium is 10 mg/L ,the adsorption of uranium on AO‐MWNTs balances after oscillating 30 min ,and the adsorption capacity reaches 18.93 mg/g ,while the raw‐MWNTs tend to be stable after 60 min , and the adsorption capacity is 9.59 mg/g .The adsorption capacity of uranium on AO‐MWNTs can be described by Langmuir and Freundlich models ,and the theoretical maximum adsorption capacity can reach 106.38 mg/g .