Application of graphene for preconcentration and highly sensitive stripping voltammetric analysis of organophosphate pesticide.
Application of graphene for preconcentration and highly sensitive stripping voltammetric analysis of organophosphate pesticide.
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DOI：
10.1016/j.aca.2011.05.032
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发表时间：
2011-08
影响因子：
6.2
通讯作者：
Shuo Wu;Xiaoqin Lan;Li-jun Cui;Lihui Zhang;Shengyang Tao;Hainan Wang;Mei Han;Zhiguang Liu
中科院分区：
文献类型：
--
作者：
Shuo Wu;Xiaoqin Lan;Li-jun Cui;Lihui Zhang;Shengyang Tao;Hainan Wang;Mei Han;Zhiguang Liu
以电化学还原的β-环糊精分散石墨烯（β-CD-graphene）为吸附剂，对具有良好氧化还原活性的硝基芳香族有机磷农药甲基异硫氰酸根离子（MP）进行预富集和电化学传感。由于β-CD-石墨烯的超大比表面积、大的离域π电子体系和超导电性，MP可以在β-CD-石墨烯修饰电极上以强π-π相互作用提取，并表现出快速的积累和电子转移速率。与微分脉冲伏安法相结合，该传感器显示出超高的灵敏度，良好的选择性和快速响应。0.05 ppb的检测限比从其他基于吸附剂的传感器获得的检测限低10倍以上。该方法为电化学传感器在超痕量有机磷监测中的广泛应用开辟了新的可能性。
Electrochemical reduced β-cyclodextrin dispersed graphene (β-CD-graphene) was developed as a sorbent for the preconcentration and electrochemical sensing of methyl parathion (MP), a representative nitroaromatic organophosphate pesticide with good redox activity. Benefited from the ultra-large surface area, large delocalized π-electron system and the superconductivity of β-CD-graphene, large amount of MP could be extracted on β-CD-graphene modified electrodeviastrong π–π interaction and exhibited fast accumulation and electron transfer rate. Combined with differential pulse voltammetric analysis, the sensor shows ultra-high sensitivity, good selectivity and fast response. The limit of detection of 0.05 ppb is more than 10 times lower than those obtained from other sorbent based sensors. The method may open up a new possibility for the widespread use of electrochemical sensors for monitoring of ultra-trace OPs.