壳聚糖修饰碳纳米管对含铁放射性废水的处理  

Chitosan Functionalized Carbon Nanotubes for Iron Ion Containing Wastewater Treatment

作　　者：任超[1] 康斌[1] 常树全[1] 李俊[1] 沈舞婷[1] 代明珠[1] 董宇[1] 戴耀东[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《原子能科学技术》2013年第7期1101-1106,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(81071256;81101146;11105073);江苏省自然科学基金资助项目(BK2011738;BK2011739);江苏省环保厅科研课题资助项目(201151)

摘　　要：采用稳定性同位素56Fe的硫酸亚铁溶液模拟核医学放射性废水中的55 Fe、59 Fe、52 Fe,研究经壳聚糖修饰的多壁碳纳米管CS-MWNTs对亚铁离子的吸附效果。并研究不同pH值、温度、时间、平衡离子浓度对吸附量的影响。结果表明,在相同条件下,CS-MWNTs相比原始多壁碳纳米管MWNTs吸附量有较大提升。CS-MWNTs与MWNTs在中性条件下的吸附效果均较酸性条件下的好,而在偏碱性条件下,溶液会发生沉淀,吸附不再是主要作用。CS-MWNTs与MWNTs对亚铁离子的吸附作用约在3h达到平衡,且均为吸热反应。在室温25℃、pH=5条件下,CS-MWNTs和MWNTs对亚铁离子的饱和吸附量分别为51mg/g和27mg/g。两种吸附材料的吸附过程均符合Freundlich方程。The stable isotope 56Fe was used to simulate the radioactive 55Fe,59Fe,and 52Fe ions existing in the wastewater generated by nuclear medicine and then the removal efficiency of 56Fe2＋ in water was studied using chitosan functionalized multi-walled carbon nanotubes（CS-MWNTs） as adsorbent.The influences of pH,temperature,time,and equilibrium ion concentration on the adsorption capacity were studied.The results show that in the same conditions,the adsorption capacity of CS-MWNTs is significantly increased compared to the pristine multi-walled carbon nanotubes（MWNTs）.Both CS-MWNTs and MWNTs exhibit a better removal efficiency of Fe2＋ in neutral solutions than in acidic solutions,while in basic solutions,the Fe2＋ will precipitate and the removal of Fe2＋ is no longer due to the adsorption effect.The adsorption equilibrium will be reached in about 3 h and the adsorption of Fe2＋ to either CS-MWNTs or MWNTs is endothermic.At room temperature of 25 ℃ and pH=5,the saturate adsorption capacity of CS-MWNTs for Fe2＋ is 51 mg/g,and that of pristine MWNTs is 27 mg/g.The Freundlich adsorption model can well represent the adsorption of Fe2＋ to both of two kinds of adsorbent materials.

关 键 词：壳聚糖 碳纳米管 铁离子 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]