A highly sensitive electrochemical sensor based on poly(3-aminobenzoic acid)/graphene oxide-gold nanoparticles modified screen printed carbon electrode for paraquat detection  

作　　者：Dechnarong Pimalai Thitirat Putnin Suwussa Bamrungsap 

机构地区：[1]National Nanotechnology Center(NANOTEC),National Science and Technology Development Agency(NSTDA),Pathum Thani 12120,Thailand

出　　处：《Journal of Environmental Sciences》2025年第2期139-150,共12页环境科学学报(英文版)

基　　金：supported by the ProgramManagement Unit on Area Based Development (PMUA),Thailand (No.4594393);the National Science and Technology Development Agency (NSTDA),Thailand (No.P2250367).

摘　　要：Herein,a modified screen printed carbon electrode(SPCE)based on a composite material,graphene oxide-gold nanoparticles(GO-AuNPs),and poly(3-aminobenzoic acid)(P3ABA)for the detection of paraquat(PQ)is introduced.The modified electrode was fabricated by drop casting of the GO-AuNPs,followed by electropolymerization of 3-aminobenzoic acid to achieve SPCE/GO-AuNPs/P3ABA.The morphology and microstructural characteristics of the modified electrodes were revealed by scanning electron microscopy(SEM)for each step of modification.The composite GO-AuNPs can provide high surface area and enhance electroconductivity of the electrode.In addition,the presence of negatively charged P3ABA notably improved PQ adsorption and electron transfer rate,which stimulate redox reaction on the modified electrode,thus improving the sensitivity of PQ analysis.The SPCE/GOAuNPs/P3ABA offered a wide linear range of PQ determination(10^(−9)-10^(−4) mol/L)and low limit of detection(LOD)of 0.45×10^(−9) mol/L or 0.116μg/L,which is far below international safety regulations.The modified electrode showed minimum interference effect with percent recovery ranging from 96.5%to 116.1%after addition of other herbicides,pesticides,metal ions,and additives.The stability of the SPCE/GO-AuNPs/P3ABA was evaluated,and the results indicated negligible changes in the detection signal over 9 weeks.Moreover,this modified electrode was successfully implemented for PQ analysis in both natural and tapped water with high accuracy.

关 键 词：PARAQUAT Electrochemical sensor Graphene oxide(GO) Gold nanoparticle(AuNP) Poly(3-aminobenzoic acid)(P3ABA) 

分 类 号：O64[理学—物理化学]