通过简单的水热反应制备了一种以铜为中心金属,以2-氨基对苯二甲酸为有机配体的金属有机框架材料(MOF)。用X射线衍射仪、傅里叶变换红外光谱仪、气体物理吸附仪和扫描电子显微镜等对其结构、形貌、比表面积等进行了表征分析。以Cu-MOF为活性材料构建电化学传感器,利用差示脉冲阳极溶出伏安法对样品中Pb2+进行检测,系统考察了沉积电位、沉积时间、pH、扫描速率等对目标物检测的影响。实验发现,在最佳条件下,Cu-MOF对3nmol/L～7mmol/L范围内的铅离子表现出良好的线性关系,Pb2+的检测限为0.025nmol/L。同时,还研究了传感器的抗干扰能力及对真实样品的检测效果。实验结果表明,Cu-MOF对Pb2+的检测显示出良好的灵敏度、选择性、再现性,以及较宽的线性检测范围和较低的检测限,是一种极具应用潜力的电化学传感器活性材料。
A metal-organic framework material with copper as central metal and 2-aminobenzenedicarboxylic acid as organic ligand was fabricated by a simple hydrothermal reaction.X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),physical adsorption instrument and scanning electron microscope (SEM) were used to characterize and analyze its structure,morphology and specific surface area.The obtained Cu-MOF material was used as active material to construct electrochemical sensor to detect Pb2+ via differential pulse anodic stripping voltammetry.The influence of pH,deposition potential and deposition time on the detection of targets were systematically investigated.Under the optimal conditions,the Cu-MOF electrode showed a good linear relationship for lead ions in the range of 3nmol/L to 7mmol/L,and the detection limit for Pb2+ was 0.025nmol/L.At the same time,the anti-interference ability of the sensor and the detection effect on real samples were also studied.The experimental results revealed that Cu-MOF in the detection of Pb2+ exhibited good sensitivity,selectivity and reproducibility,as well as a wide linear detection range and low detection limit,which made it a promising electrochemical sensor active material.
[1] Huang D,Niu C,Zeng G,et al. A highly sensitive protocol for the determination of Hg2+ in environmental water using time-gated mode[J].Talanta:The International Journal of Pure and Applied Analytical Chemistry,2015,132:606-612.
[2] Hassanpour A,Hosseinzadeh-Khanmiri R,Babazadeh M,et al.Determination of heavy metal ions in vegetable samples using a magnetic metal-organic framework nanocomposite sorbent[J].Food Additives & Contaminants,Part A.Chemistry,Analysis,Control,Exposure & Risk Assessment,2015,32(5):725-736.
[3] Chen X,Tong R,Shi Z,et al.MOF nanoparticles with encapsulated autophagy inhibitor in controlled drug delivery system for antitumor[J].ACS Applied Materials & Interfaces,2018,10(3):2328-2337.
[4] Giakisikli G,Anthemidis A N.Magnetic materials as sorbents for metal/metalloid preconcentration and/or separation.a review[J].Analytica Chimica Acta,2013,789:1-16.
[5] Bodkhe G A,Hedau B S,Deshmukh M A,et al.Selective and sensitive detection of lead Pb(Ⅱ) ions:Au/SWNT nanocomposite-embedded MOF-199[J].Journal of Materials Science,2021,56:474-487.
[6] Fang X,Zong B,Mao S.Metal-organic framework-based sensors for environmental contaminant sensing[J].Nano-Micro Letters,2018,10(4):90-108.
[7] Ye W,Li Y P,Wang J T,et al.Electrochemical detection of trace heavy metal ions using a Ln-MOF modified glass carbon electrode[J].Journal of Solid State Chemistry,2020,281:121032.
[8] Ruan B,Yang J,Zhang Y J,et al.UiO-66 derivate as a fluorescent probe for Fe3+ detection[J].Talanta:The International Journal of Pure and Applied Analytical Chemistry,2020,218:121207.
[9] Yu C,Shao Z,Hou H.A functionalized metal-organic framework decorated with O- groups showing excellent performance for lead(Ⅱ) removal from aqueous solution[J].Chemical Science,2017,8(11):7611-7619.
[10] Liu N.Sensitive stripping voltammetric determination of Pb(Ⅱ) in soil using a bi/single-walled carbon nanotubes-nafion/ionic liquid nanocomposite modified screen-printed electrode[J].International Journal of Electrochemical Science,2020,15(8):7868-7882.
[11] Xu W Q,He S,Lin C C,et al.A copper based metal-organic framework:synthesis,modification and VOCs adsorption[J].Inorganic Chemistry Communications,2018,92:1-4.
[12] Sun Y M,Li Y X,Wang N,et al.Copper-based metal-organic framework for non-enzymatic electrochemical detection of glucose[J].Electroanalysis,2018,30(3):474-478.
[13] Wang H L,Zhu Q L,Zou R Q,et al.Metal-organic frameworks for energy applications[J].Chem,2017,2(1):52-80.
[14] Sienkiewicz-Gromiuk J,Mazur L,Bartyzel A,et al.Synthesis,crystal structure,spectroscopic and thermal investigations of a novel 2D sodium(i) coordination polymer based on 2-aminoterephthalic ligand[J].Journal of Inorganic and Organometallic Polymers and Materials,2012,22(6):1325-1331.
[15] Pankajakshan A,Kuznetsov D,Mandal S.Ultrasensitive detection of Hg(Ⅱ) ions in aqueous medium using zinc-based metal-organic framework[J].Inorganic Chemistry,2019,58(2):1377-1381.
[16] Huang L,Huang W,Shen R,et al.Chitosan/thiol functionalized metal-organic framework composite for the simultaneous determination of lead and cadmium ions in food samples[J].Food Chemistry,2020,330:127212.
基金资助
国家自然科学基金(22066020);河南省高等学校青年骨干教师培养计划项目(2019GGJS092);河南省科技厅科技攻关计划项目(222102310298);河南工业大学青年骨干教师培育计划项目(21420109);国家级大学生创新创业训练计划项目(202210463031)
PDF
