基于MOFs衍生金属氧化物/碳材料构建的甲基对硫磷传感器

MOFs-derived Metal Oxide/Carbon Materials Modified Electrode as a Sensor for Determination of Methyl Parathion

合成了以对苯二甲酸为配体的MIL-125(Ti)和UiO-66(Zr),并以其为前驱体,分别制备了TiO2/C1000、ZrO2/C1000纳米材料.利用X射线衍射仪、扫描电镜、气体吸附仪对材料进行物相、形貌、比表面积的研究.结果表明:ZrO2/C1000主要表现为介孔材料,而TiO2/C1000为明显的微/介孔材料.采用循环伏安法对比TiO2/C1000、ZrO2/C1000纳米材料修饰玻碳电极(GCE)检测甲基对硫磷(MP)的电化学行为,结果表明BET较小的TiO2/C1000对MP有较好的检测效果.最优条件下,MP在TiO2/C1000/GCE上的线性范围为2~40μg·m L^-1,检测限为1. 27μg·m L^-1(S/N=3).

MIL-125(Ti) and Ui O-66(Zr) with terephthalic acid as ligand were synthesized and used as precursors to prepare TiO2/C1000 and ZrO2/C1000 nanomaterials,respectively.The phase,morphology and specific surface area of the material were studied by diffractometer,scanning electron microscopy and gas adsorbent.The results showed that ZrO2/C1000 was mainly mesoporous materials category,and TiO2/C1000 belonged to the mesoporous materials category as well as partially to the micropores category.The two pyrolysis products were used as electrode modified materials for determination of methyl parathion(MP) by cyclic voltammetry,and it found that the signal-strength effect of TiO2/C1000 was more remarkable than that of ZrO2/C1000.Under the optimal conditions,the linear ranges of MP on TiO2/C1000/GCE were 2~40 μg·m L^-1 with the detection limits of 1.27 μg·m L^-1( S/N = 3).