废弃花生壳活化热解炭用于检测芦丁的电化学传感

Electrochemical sensing of discarded peanut hull activated pyrolytic carbon for rutin detection

以废弃花生壳为原料,NaCl为活化剂,通过简易的熔融盐一步热解法制得了花生壳活化热解炭(PHAPC)。通过SEM、TEM、XRD、XPS、BET、EIS和CV对材料的结构、形貌和电化学性能进行了表征和测试。与未经熔融盐活化的花生壳热解炭(PHPC)相比,PHAPC具有更丰富的孔道结构和更大的比表面积,同时表现出更优异的导电性与电化学性能。将PHAPC或者PHPC修饰在玻碳电极(GCE)表面,然后采用微分脉冲伏安法(DPV)考察了芦丁在这些电极(PHAPC/GCE或PHPC/GCE)的电化学行为。结果表明,PHAPC/GCE对芦丁的电化学活性高于PHPC/GCE。当芦丁的浓度在0.05~10μmol/L范围内时,基于PHAPC/GCE构建的传感器的响应电流值与其浓度呈现良好的线性关系,检出限[信噪比(r_(SN))=3]为0.05μmol/L,灵敏度为83.61μA·L/(μmol·cm^(2))。此外,该传感器具有良好的重复性,其相对标准偏差(RSD)为3.06%。采用标准加入法对芦丁片中芦丁进行检测,回收率为96.0%~101.5%。

Peanut hull activated pyrolytic carbon(PHAPC)was prepared from discarded peanut hull with NaCl as activator by a simple one-step molten salt pyrolysis method.The structure,morphology and electrochemical properties of the PHAPC obtained were then characterized and analyzed by SEM,TEM XRD,XPS,BET,EIS and CV.Compared with peanut hull pyrolysis carbon(PHPC)without molten salt activation,PHAPC exhibited richer pore structure,larger specific surface area,superior conductibility and electrochemical properties.The electrochemical behavior of rutin at the electrodes(PHAPC/GCE or PHPC/GCE),which was synthesized via PHAPC or PHPC modification on the surface of glassy carbon electrode(GCE),was investigated by differential pulse voltammetry(DPV).The results demonstrated that the PHAPC/GCE showed higher electrochemical activity towards rutin than the PHPC/GCE.When the concentration of rutin was in the range of 0.05~10μmol/L,the electrochemical current of rutin on PHAPC/GCE showed a linear relationship,with a detection limit of 0.05μmol/L[The ratio of signal to noise(r_(SN))is 3]and a sensitivity of 83.61μA·L/(μmol·cm^(2)).Moreover,the sensor displayed good repeatability with a relative standard deviation(RSD)of 3.06%.The standard addition method used for the detection of rutin in rutin tablets showed excellent recovery percentages from 96.0%~101.5%.