Magnetic and Mesoporous Silica-Niobia Material as Modifier of Carbon Paste Electrode for p -Nitrophenol Electrochemical Determination

Journal of the Brazilian Chemical Society

article

Tkachenko, Oleg¹  Rosa, Danielle S. da¹  Virgili, Anike H.¹  Vasconcellos, Marcos A. Z.³  Costa, Tania M. H.¹  Arenas, Leliz T.¹  Deon, Monique¹  Benvenutti, Edilson V.¹  Menezes, Eliana W. de¹ 

[1] Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS);Materials Chemistry Department, V. N. Karazin Kharkiv National University;Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS)

关键词: composite;    SiO2;    Nb2O5;    Fe3O4;    4-nitrophenol;    environmental pollutant;   

DOI  :  10.21577/0103-5053.20200215

学科分类：内科医学

来源: SciELO

【 摘 要 】

In the present work, the sol-gel synthesis method was employed as strategy to obtain a magnetic and mesoporous silica-niobia material. The planned synthesis was based on the hetero-condensation of niobium and silicon alkoxide precursors, in the presence of spherical magnetite particles. The resulting material presented interesting characteristics such as magnetism, large mesopores, in the range from 20 to 50 nm, and 68 m 2 g -1 of surface area. These features allowed its use as modifier of carbon paste electrode for p -nitrophenol determination, since niobia has never been used in electrochemical sensors for the determination of nitrophenol compounds. By using differential pulse voltammetry technique, the electrode can be applied in a wide range of p -nitrophenol concentration, from 10 to 490 μmol L -1 , with a limit of detection of 1.2 µmol L -1 and sensitivity up to 0.60 µA L µmol -1 . The proposed electrode presented good sensitivity and selectivity and it was applied in real water samples.

【 授权许可】

CC BY