Diverse functional groups decorated, bifunctional polyesteramide as efficient Pb(II) electrochemical probe and methylene blue adsorbent

Abstract

The construction of novel polyesteramide (PEA) derivative with diverse structure and multifunction characteristics would provide effective promotion for the further development of PEAs. In this study, a phenolic hydroxyl-modified polyamide (PA) derivative (P2), which was prepared from benzoxazine-isocyanide chemistry (BIC), was selected as the phenolic source to condense with trimesoyl chloride (TMC). A type of novel cross-linked PEA derivative (PEA-TMC), which with diverse N, O-containing functional segments (amide, ester, tertiary amine, hydroxyl and carboxyl groups) in its structure, was successfully constructed. Chemical structure and elementary properties of PEA-TMC were characterized here. As compared to that of bare glassy carbon electrode (GCE), PEA-TMC-modified GCE (GCE/PEA-TMC) illustrated significantly strengthened electrochemical response toward Pb2+. Further investigation revealed that GCE/PEA-TMC can be applied as “enrichment”-type electrochemical probe for Pb2+, with the corresponding detection limit of ∼2.3 × 10−8 mol/L (3σ/k). At the same time, the efficient and selective adsorption of methylene blue (MB) by PEA-TMC was also studied. Experimental results showed that the kinetic and isotherm of MB adsorption by PEA-TMC were in accordance with pseudo-second-order and Langmuir models, respectively, with the maximum adsorption value up to ∼560.80 mg g−1.