含氰基聚合物微球对铜离子吸附性能的研究

Study on adsorption behavior of polymer microsphere grafted-CN for cupper ions

以火焰原子吸收光谱法(FAAS)为检测手段,研究了聚丙烯腈微球(PANMS)对溶液中Cu2+的吸附及其影响因素,并建立了PANMS分离富集-FAAS法。实验结果表明,溶液pH为5、静态吸附时间为1.5 h、温度为20℃时,其对Cu2+的吸附达到饱和而稳定,吸附容量为30.2 mg/g,吸附率可达到87.5%。随着吸附时间的延长吸附率有所提高,但幅度不是很大。以0.1 mol/LHC l溶液作为解吸剂,解吸率可达到96.5%。经富集50倍后,测Cu2+工作曲线的回归方程为A=0.0025C(μg/L)-0.0026(r=0.9993),方法的检出限为1.68μg/L,相对标准偏差(RSD)小于2.9%。加标回收率为91.4%~97.0%。

In this paper,adsorption behavior of cupper ions on polymer microsphere polyarylonitrile which was used as adsorbent of Cu in water solution has been studied using flame atomic Absorption spectrometry(FAAS) as a sensitive detector.Its adsorption and factors which affect the adsorption capacity were studied by AAS.The experimental results showed that under the optimal adsorption conditions,pH of adsorbate solution was 5,static adsorption time was 1.5h and adsorption procedure was carried out at 20 ℃,polyacrylonitrile as adsorbent had high adsorption capacity for Cu2+ which could reach 30.2 mg/g under the optimal adsorption conditions.Adsorption efficiency was 87.5% during the static adsorption time of 1.5h.Using 0.10 mol/L chloride acid as the best desorption solvent desorbed the adsorbates,the recovery of them reached 96.5%.When the enrichment factor was 50 times,the detection limits(3σ,n=10) was 1.68 μg/L,and the relative standard deviation(RSD) was not more than 2.9%.The method was applied to the determination of analytes in real samples,and good results were obtained(recoveries were 91.4%～97.0%).