摘要
羟丙基-β-环糊精(HP-β-CD)与羧基化多壁碳纳米管(COOH-MWNTs)经过聚合反应,形成β-环糊精-碳纳米管(β-CDMWNTs)交聚复合材料。探究了在不同p H、反应时间、铀的初始浓度和吸附剂投加量条件下对铀的吸附能力。结果表明,p H为5、铀浓度为10 mg/L、β-CD-MWNTs吸附60 min后基本处于平衡状态,吸附容量高达18.36 mg/g。准二级动力学模型(R^2>0.999)和Langmuir等温模型(R2>0.996)均可拟合其对铀的吸附过程,饱和吸附容量为83.33 mg/g。采用TEM、SEM、EDS和FTIR分析表明,HP-β-CD已被接枝到MWNTs上,而在对铀的吸附过程中,—C=O、—C—O和—OH等基团发挥着重要的作用。
MWNTs are reacted with HP-β-CD to obtain β-CD-MWNTs with great dispersivity. The effects of p H,initial concentration of uranium,contact time and adsorbent dosage on the adsorption behavior were investigated. The results show that pH = 5,the initial concentration of uranium was 10 mg/L,the adsorption of uranium onβ-CD-MWNTs after 90 min,and the adsorption capacity is 18. 36 mg/g at 25 ℃.Kinetics and isothermal were better fitted by Langmuir isotherm model and pseudo-second-order kinetic model,and the maximum adsorption capacity was 83. 33 mg/g. The composites had been antegrallty made,the —C=O,—C—O and —OH played irreplaceable role by TEM,SEM,EDS and FTIR.
出处
《科学技术与工程》
北大核心
2017年第26期139-145,共7页
Science Technology and Engineering
基金
国家自然科学基金(11275095)
湖南省高校重点实验室开放基金(11K055)
湖南省环境保护厅科技发展计划(湘财建指【2012】347号)资助
关键词
多壁碳纳米管
羟丙基-Β-环糊精
铀
吸附
multi-walled carbon nanotube hydroxypropyl-p-Cyclodextrin uranium adsorption
