Synthesis of silver nanoparticles decorated on core-shell structured tannic acid-coated iron oxide nanospheres for excellent electrochemical detection and efficient catalytic reduction of hazardous 4-nitrophenol

• Published in: Composites. Part B, Engineering Vol. 162; pp. 33 - 42
• Main Authors: Sangili, Arumugam, Annalakshmi, Muthaiah, Chen, Shen-Ming, Balasubramanian, Paramasivam, Sundrarajan, Mahalingam
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2019
• Subjects: 4-Nitrophenol; AgNPs; Catalytic reduction; Electrochemical sensor; Fe3O4; Tannic acid; Fe3O4; Tannic acid; AgNPs; 4-Nitrophenol; Catalytic reduction; Electrochemical sensor
• ISSN: 1359-8368; 1879-1069
• DOI: 10.1016/j.compositesb.2018.10.084

In this research, synthesis of silver nanoparticles (Ag NPs) decorated on tannic acid (TA) covered magnetite (Fe3O4) (TA@Fe3O4-Ag NPs) nanohybrid is reported. TA (carbon-shell) on Fe3O4 nanospheres (core) acted as a green reducing and stabilizing agent for the reduction of Ag ions into Ag NPs. The as-synthesized TA@Fe3O4-AgNPs core-shell nanohybrid was employed as an efficient nanomaterial for the electrochemical detection and catalytic reduction of ecotoxic 4-nitrophenol (4-NP). TA@Fe3O4-AgNPs nanohybrid modified glassy carbon electrode (GCE) displayed a higher cathodic current response at a very lower over potential of −0.39 V toward 4-NP detection. Under optimized condition, TA@Fe3O4-AgNPs nanohybrid based sensor showed a broad working range from 0.1 to 680.1 μM, with a lower limit of detection of 33 nM for the detection of 4-NP. In addition, TA@Fe3O4-AgNPs nanohybrid exhibited a tremendous catalytic reduction activity for 4-NP, when compared to TA@Fe3O4 and Fe3O4. The results demonstrated that the TA@Fe3O4-AgNPs nanohybrid could be a promising nanocatalyst for the electrochemical detection and catalytic reduction of 4-NP. [Display omitted] •Synthesis of silver nanoparticles decorated on tannic acid coated magnetite nanohybrid is reported.•As-synthesized TA@Fe3O4-AgNPs nanohybrid was employed for the electrochemical detection and catalytic reduction of 4-NP.•TA@Fe3O4-AgNPs/GCE can detect the 4-NP at low potential (Epc = −0.39 V) with linear range (0.1–680.1 μM), and LOD (33 nM).•TA@Fe3O4-AgNPs nanohybrid exhibited a tremendous catalytic reduction activity for 4-NP, than the TA@Fe3O4 and Fe3O4.