High-sensitive sensor for the simultaneous determination of phenolics based on multi-walled carbon nanotube/NiCoAl hydrotalcite electrode material

• Published in: Mikrochimica acta (1966) Vol. 188; no. 9; p. 308
• Main Authors: Li, Zhen, Zeng, Hong-Yan, Cao, Xiao-Ju, Li, Hao-Bo, Long, Yi-Wen, Feng, Bo, Lv, Shi-Bing
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.09.2021; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Bisphenol A; Catechol; Characterization and Evaluation of Materials; Chemical sensors; Chemistry; Chemistry and Materials Science; Electric properties; Electrochemical analysis; Electrochemical reactions; Electrode materials; Hydroquinone; Microengineering; Morphology; Multi wall carbon nanotubes; Nanochemistry; Nanotechnology; Nanotubes; Original Paper; Phenols; Sensors; NiCoAl hydrotalcite; Simultaneous determination; Electrochemical sensor; Multi-walled carbon nanotube; Phenolics
• ISSN: 0026-3672; 1436-5073; 1436-5073
• DOI: 10.1007/s00604-021-04948-1

The ternary NiCoAl hydrotalcite (NiCoAl-LDH) was combined with carboxylic multi-walled carbon nanotube (MWCNT) to fabricate a novel electrochemical sensor for simultaneously determining the co-existing trace phenolic substances. The morphology, structure, and electrochemical behavior of the as-prepared materials were characterized by various techniques. Benefitting from the great conductivity of MWCNT and high electrocatalytic activity of NiCoAl-LDH for phenolic substances, the advanced MWCNT/NiCoAl-LDH sensor presented a fast response, high sensitivity, excellent stability, and satisfactory replicability. The sensor offered good linear responses in the ranges1.50~600 μM to hydroquinone (HQ), 5.00~1.03 × 10 3  μM to catechol (CC), and 6.00 × 10 −2 ~250 μM to bisphenol A (BPA). The detection limits of HQ, CC, and BPA were 0.4, 0.8, and 6. × 10 −3  μM ( S / N  = 3), respectively. In environmental water, the sensor achieved satisfactory recoveries for the simultaneous detection of HQ (98.6~101%), CC (98.0~101%), and BPA (97.5~101%), with relative standard deviations less than 4.4%. Graphical abstract