基于玉米秸秆和荔枝树枝生物炭的电化学传感器对水中镉离子的检测  

Detection of Cadmium Ions in Water by Electrochemical Sensors Based on Corn Stover and Lychee Twig Biochar

作　　者：林金毫 黄建智 李衍亮 Lin Jinhao;Huang Jianzhi;Li Yanliang(School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,China)

机构地区：[1]东莞理工学院生态环境与建筑工程学院,广东东莞523808

出　　处：《微纳电子技术》2024年第11期173-182,共10页Micronanoelectronic Technology

基　　金：2022年广东省科技创新战略专项资金(“攀登计划”项目);东莞理工学院水污染控制与修复研究团队项目(TDYB2019005);2020年研究生教育创新计划项目。

摘　　要：以玉米秸秆和荔枝树枝为原料,500℃下制备生物炭。采用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和傅里叶变换红外(FTIR)光谱仪对两种生物炭进行表征。通过滴涂法将两种生物炭材料分别修饰在玻碳电极(GCE)表面,成功构建了Y-BC/GCE和L-BC/GCE电化学传感器,并在醋酸盐缓冲液中用微分脉冲伏安法(DPV)研究了镉金属离子(Cd^(2+))在不同电极上的电化学行为。结果表明,两种生物炭修饰电极对Cd^(2+)的检测都取得较好的效果。在最优条件下(Y-BC/GCE:沉积电位-1.6 V、沉积时间100 s、pH=4;L-BC/GCE:沉积电位-1.3 V、沉积时间100 s、pH=5),两种生物炭传感器在浓度范围为0.2~20μmol/L内都有良好的线性关系,Cd^(2+)检出限分别低至0.06和0.05μmol/L。同时这两种生物炭传感器具有良好的稳定性、重复性以及抗干扰性,对实际样品中的Cd^(2+)具有良好的回收率(Y-BC/GCE:96.97%~102.57%;L-BC/GCE:97.01%~99.10%)。With corn stover and lychee twig as raw materials,the biochar was prepared at 500℃.Two biochars were characterized by scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared(FTIR)spectrometer.The two biochar materials were respectively modified on the surface of glassy carbon electrodes(GCEs)by drop-coating method to construct Y-BC/GCE and L-BC/GCE electrochemical sensors successfully,and the electrochemical behaviors of cadmium metal ions(Cd^(2+))on different electrodes were investigated in acetate buffer solution by differential pulse voltammetry(DPV).The results show that both biochar-modified electrodes achieve better effects for the detection of Cd^(2+).Under the optimal conditions(Y-BC/GCE:deposition potential of-1.6 V,deposition time of 100 s,pH=4;L-BC/GCE:deposition potential of-1.3 V,deposition time of 100 s,pH=5),the two biochar sensors show good linear relationships in the concentration range of 0.2-20μmol/L,and the detection limits of Cd^(2+)are as low as 0.06 and 0.5μmol/L,respectively.Meanwhile,the two biochar sensors have good stabilities,reproducibilities and immunities to interference,with good recovery rates of Cd^(2+)in real samples(Y-BC/GCE:96.97%-102.57%;L-BC/GCE:97.01%-99.10%).

关 键 词：生物炭 电化学传感器 微分脉冲伏安法(DPV) 镉离子 重金属检测 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]