树状聚嘧胺-2-巯基苯并咪唑修饰硅胶分离富集镉
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摘要
制备了树状聚嘧胺-2-巯基苯并咪唑修饰硅胶PDM-n. 0MBISG (n=1,2,3,4),利用红外光谱、扫描电镜、热重分析、元素分析和孔径与比表面分析进行表征。以PDM-n. 0MBISG(n=1,2,3,4)为填料研究其对Cd~(2+)的微柱分离富集性能。结果表明,pH8试液以3. 0 mL/min流速进样,可以实现Cd~(2+)定量吸附。PDM-n. 0MBISG (n=1,2,3,4)对Cd~(2+)的吸附容量分别为13. 37,17. 78,23. 70和29. 19 mg/g,富集系数分别达到100,150,200和200倍。准二级动力学方程可以较好的描述PDM-n. 0MBISG (n=1,2,3,4)对Cd~(2+)的吸附行为,使用100个吸附和解吸附循环后,其吸附性能未发生变化。以PDM-4. 0MBISG作为微柱填料建立了分离富集-石墨炉原子吸收光谱测定Cd~(2+)的方法,方法检出限为0. 1 ng/mL,测定Cd~(2+)的线性范围为1. 0～16 ng/mL。该方法成功应用于国标样品、鱿鱼和海水中Cd~(2+)分析。
Dendrimer-like polypyrimidine and 2-mercaptobenzimidazole were linked to silica-gel surface to obtain novel adsorbents PDM-n. 0MBISG( n = 1,2,3,4),which were characterized with FTIR,SEM,TG,elemental analysis,and analysis of pore and specific surface area. PDM-n. 0MBISG was used as packing for micro-column adsorption of Cd~(2+). The experiment results showed that Cd~(2+)in pH = 8 solution could be quantitatively absorbed with a sampling flow rate of 3. 0 m L/min. Adsorption capacity of PDM-n. 0MBISG( n = 1,2,3,4) for Cd~(2+)was 13. 37,17. 78,23. 70 and 29. 19 mg/g respectively. Enrichment factor( PF) of PDM-n. 0MBISG( n = 1,2,3,4) for Cd~(2+)reached 100,150,200 and 200 respectively. PDM-n. 0MBISG( n = 1,2,3,4) could be used no less than 100 cycles without change of adsorption property. Pseudo-second-order model was suitable to interpret the kinetics of adsorption of Cd~(2+). With PDM-4. 0MBISG as adsorbent,micro-column preconcentration-graphite furnace atomic absorption spectrometry( GFAAS) method for analysis of Cd~(2+)was proposed. The limit of detection( LOD) for Cd~(2+)was 0. 1 ng/m L. The linear range for the determination of Cd~(2+)was 1. 0～ 16 ng/m L. The proposed method was successfully applied to the analysis of Cd~(2+)in standard reference material,squid and sea water.
Dendrimer-like polypyrimidine and 2-mercaptobenzimidazole were linked to silica-gel surface to obtain novel adsorbents PDM-n. 0MBISG( n = 1,2,3,4),which were characterized with FTIR,SEM,TG,elemental analysis,and analysis of pore and specific surface area. PDM-n. 0MBISG was used as packing for micro-column adsorption of Cd~(2+). The experiment results showed that Cd~(2+)in pH = 8 solution could be quantitatively absorbed with a sampling flow rate of 3. 0 m L/min. Adsorption capacity of PDM-n. 0MBISG( n = 1,2,3,4) for Cd~(2+)was 13. 37,17. 78,23. 70 and 29. 19 mg/g respectively. Enrichment factor( PF) of PDM-n. 0MBISG( n = 1,2,3,4) for Cd~(2+)reached 100,150,200 and 200 respectively. PDM-n. 0MBISG( n = 1,2,3,4) could be used no less than 100 cycles without change of adsorption property. Pseudo-second-order model was suitable to interpret the kinetics of adsorption of Cd~(2+). With PDM-4. 0MBISG as adsorbent,micro-column preconcentration-graphite furnace atomic absorption spectrometry( GFAAS) method for analysis of Cd~(2+)was proposed. The limit of detection( LOD) for Cd~(2+)was 0. 1 ng/m L. The linear range for the determination of Cd~(2+)was 1. 0～ 16 ng/m L. The proposed method was successfully applied to the analysis of Cd~(2+)in standard reference material,squid and sea water.
引文
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[3] Burakov A E,Galunin E V,Burakov I V,et al. Ecotoxicol. Environ. Saf.,2018,148:702
[4] Zhang Y,Chen Y,Wang C,et al. J. Hazard. Mater.,2014,276:129
[5] An F Q,Wang Y,Xue X Y,et al. J. Chem. Eng. Res. Des.,2018,130:78
[6] Feist B,Sitko R. Food Chem.,2018,249:38
[7] Jazi M B,Arshadi M,Amiri M J,et al. J. Colloid Interface Sci.,2014,422:16
[8] Pirveysian M,Ghiaci M. Appl. Surf. Sci.,2018,428:98
[9] Chella S,Kollu P,Komarala E V P R,et al. Appl. Surf. Sci.,2015,327:27
[10] Zhao Z,Zhang X,Zhou H,et al. Microporous Mesoporous Mater.,2017,242:50
[11] Madadizadeh M,Taher M A,Ashkenani H. Environ. Monit. Assess,2013,185(5):4097
[12] Wen S,Zhu X,Huang Q,et al. Microchim. Acta,2014,181(9-10):1041
[13] Niu Y,Qu R,Chen H,et al. J. Hazard. Mater.,2014,278:267
[14] Wu X,Liu P,Pu Q,et al. Anal. Lett.,2003,36(10):2229
[15] Safavi A,Iranpoor N,Saghir N. Sep. Purif. Technol.,2004,40(3):303
[16] Park J,Regalbuto J R. J. Colloid Interface Sci.,1995,175:239