三乙烯四胺修饰交联壳聚糖树脂的制备及其对痕量镉的吸附性能研究  

Synthesis of crosslinked chitosan modified with TETA and study on its adsorption performance for trace cadmium

作　　者：贺锦灿 周方钦[1] 毛燕芬 唐壮娜 李春艳[1] 

机构地区：[1]环境友好化学与应用省部共建教育部重点实验室,湘潭大学化学学院,湘潭411105

出　　处：《分析试验室》2012年第7期24-28,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(21005068)资助

摘　　要：以戊二醛、环氧氯丙烷为交联剂,用三乙烯四胺改性,由壳聚糖合成了一种新型的三乙烯四胺修饰交联壳聚糖微球(CRN)分离树脂,研究了不同条件下CRN对Cd2+的吸附性能。在pH6.0时,CRN能定量吸附溶液中的痕量Cd2+,其静态饱和吸附容量为31.0 mg/g。吸附在CRN上的Cd2+可用0.5 mol/L的H2SO4洗脱,用火焰原子吸收法测定洗脱液中Cd2+的含量。本法对Cd2+的检出限(3σ)为24.6 ng/mL,相对标准偏差(RSD)为2.1%(n=11,c=1.0μg/mL),加标回收率在97.3%～104.0%。该方法可用于矿渣中痕量镉的测定。A novel crosslinked chitosan resin（CRN） was synthesized from chitosan which was crosslinked with glutaraldehyde and chloromethyloxirane and then modified with triethylenetetramine（TETA）.The adsorption performance of Cd2＋ on CRN resin under different conditions were studied.Trace Cd2＋ in solution was quantitatively adsorbed by CRN at pH6.0,and the capacity of static saturated adsorption was 31.0 mg/g.Cd2＋ was completely eluted with 0.5 mol/L H2SO4 and the eluted Cd2＋ was determined by flame atomic absorption spectrometry.The detection limit（3σ） was 24.6 ng/mL,and the relative standard deviation（RSD） was 2.1%（n=7,ρ=1.0 g/mL）.The recoveries were 97.3%~104%.It has been applied to the determination of cadmium in slag samples with satisfactory results.

关 键 词：交联壳聚糖 分离富集 三乙烯四胺 镉 火焰原子吸收光谱法 

分 类 号：O652.6[理学—分析化学]