磺酰化β-环糊精包合N,N′-二苯硫脲对钍的吸附研究

Adsorption of Thorium by 6-O-monotosyl-deoxy-β-cyclodextrin Inclusion Complex of N,N′-diphenyl Thiourea

通过取代反应合成了磺酰化β-环糊精(6-OTs-β-CD),并采用红外光谱与核磁共振对合成材料进行表征,验证了材料合成的可靠性;通过6-OTs-β-CD与N,N′-二苯硫脲以2∶1的摩尔比反应合成了包合物6-OTs-β-CD-N,N′-二苯硫脲,采用综合热分析表征了包合物的热稳定性;用可见分光光度法分析了包合物及N,N′-二苯硫脲对钍离子的吸附行为。结果表明,室温下,相较于N,N′-二苯硫脲,6-OTs-β-CD-N,N′-二苯硫脲包合物对钍的吸附平衡时间大幅缩短。最佳吸附条件为pH=4、震荡反应10min、吸附剂加入量为0.025g,在此条件下吸附容量达27.46mg/g,吸附率达91.5%。

6‐O‐monotosyl‐deoxy‐β‐cyclodextrin （6‐OTs‐β‐CD） was prepared by literature method ,and analyzed by IR and 1 HNMR .The analytic results show that the goal mate‐rial is reliable .The inclusion complex was acquired by the reaction of 6‐OTs‐β‐CD and N ,N′‐diphenyl thiourea with the mole ratio of 2∶1 ,and then the comprehensive ther‐mal analysis spectrum was used to study the thermal stability of inclusion complex .The adsorption behaviors of the inclusion complex and N ,N′‐diphenyl thiourea to Th4＋ were studied with the method of visible spectrophotometry .The experimental results indicate that the adsorption equilibrium of inclusion complex is shorten greatly comparing with N ,N′‐diphenyl thiourea .The best adsorption conditions are as follows ：pH=4 ,sha‐king for 10 min and the sorbent mass is 0.025 g ,the adsorption capacity is 27.46 mg/g , and the adsorption rate is up to 91.5% .