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以2-巯基苯骈噻唑为修饰剂,铅离子为印迹离子成功制备分子印迹功能介孔材料,并用扫描电镜(SEM)、傅里叶红外光谱对材料进行了结构表征。铅离子分子印迹功能介孔材料能很好地将Pb(II)与性质相近的二价重金属离子Cu(II),Cd(II)和Hg(II)分离,具有非常好的吸附选择性,且静态吸附容量0.64 mmol/g。利用该材料制备的分离富集柱可以很好地富集溶液中痕量铅离子,且仅用2 mL 0.5 mol/L EDTA以0.4 mL/min流速即可完全洗脱,富集倍数高达250倍。样品预富集后的火焰原子吸收光度法线性范围为0.5～1.2×104μg/L,r=0.999 2,检出限(3σ,n=11)为0.04μg/L。利用功能介孔材料分离富集水样中痕量铅离子,用火焰原子吸收法测定含量,相对标准偏差(RSD)小于等于3%(n=6),回收率在98.2%～99.1%之间。
The molecularly imprinted functional mesoporous materials were prepared successfully by using 2-mercaptobenzothiazole as modifier and lead ions as imprinted ions. The structures of the materials were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Lead ion molecularly imprinted functional mesoporous materials can well separate Pb (II) from bivalent heavy metal ions Cu (II), Cd (II) and Hg (II) with similar properties and have very good adsorption selectivity Static adsorption capacity of 0.64 mmol / g. The separation and enrichment column prepared with this material can well enrich the trace lead ions in solution and completely elute with 2 mL 0.5 mol / L EDTA at a flow rate of 0.4 mL / min with enrichment multiple up to 250 times . The linear range of flame atomic absorption spectrometry after sample preconcentration was 0.5 ~ 1.2 × 104μg / L, r = 0.999 2, and the detection limit (3σ, n = 11) was 0.04μg / L. The separation and enrichment of trace Pb (Ⅱ) in water samples by functional mesoporous materials was carried out. The relative standard deviation (RSD) was less than 3% (n = 6) and the recovery was between 98.2% and 99.1% by flame atomic absorption spectrometry .