The biomass-derived nitrogen-doped
wormlike micro-/mesoporous carbon
(BNWMC) was synthesized for highly sensitive lead-ion detection. The
influence of carbonization temperature (CT) from 500 to 900 °C
on the transformation of nitrogen/carbon-bonding configurations, pore
structures, and electrochemical properties was investigated. The results
showed that the BNWMCs have been equipped with active nitrogen/carbon
bonding functionalities and unique human blood vessel-like structures,
which are more pronounced with increasing CTs for a more effective
generation of new criss-crossing micro/mesopores and high active quaternary-N,
graphitic-C, and pyridinic-N sites on the C–C/C–N skeletons.
The cyclic voltammetry response of the BNWMC-modified glassy carbon
electrode increased with CT, further indicating that the unique physicochemical
characteristics are crucial for improving electrochemical sensitivity
for their possessing shorter path interpenetrating micro/mesopores
and more active C/N-active sites. An excellent linear relationship
(R
2 = 0.995) between peak currents and
lead concentrations in a broad range of 10–800 mg L–1 was achieved, indicating that the BNWMC is a promising electrochemical
modifier for developing lead detection sensor.
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