油田废水中酚类污染物的电化学检测技术研究

发布时间：2018-04-22 16:07

本文选题：电化学分析 + 酚　；参考：《西安石油大学》2017年硕士论文

【摘要】：油田废水中的有机污染物酚类含有剧毒对动植物及环境伤害极大,因此对酚的实时检测与控制具有重要的意义。相较于标准的检测方法4-氨基替比林法,电化学分析方法具有操作简单、灵敏度高和可实时检测等优点,应用此方法检测酚类具有重要的科学意义和应用前景。本论文采用聚合物、碳纳米管或纳米金修饰电极表面用来制备工作电极。应用三电极系统通过循环伏安法研究酚类在修饰电极上的电化学行为、电化学阻抗法表征修饰电极的电化学性能、差分脉冲伏安法测定标准曲线和检测限。本论文工作概括如下:(1)通过聚锌修饰碳糊电极来测量苯酚,在扫描速率为100mV/s,磷酸盐缓冲溶液的pH为7.0时,所测得的苯酚的检出限为9×10-6mol/L,线行范围为21μmol/L~292μmol/L、357μmol/L~922μmol/L。(2)利用聚五磺基水杨酸和碳纳米管修饰电极成功制备了MWCNT/Poly-SA复合电极。在最佳条件下,测得的邻苯二酚的检出限和线性范围分别为:0.16μmol/L,3μmol/L~240μmol/L。(3)用电沉积的方法将纳米金成功沉积到碳糊电极表面,并和聚五磺基水杨酸、碳纳米管复合修饰电极用来测量邻硝基酚和苯酚。实验结果表明,通过邻硝基酚(0.932V)和苯酚(0.679V)的峰电位和两者的峰电位相差0.3V可明显区分两者。在最优条件下,实验得出邻硝基酚的检测线性范围为2μmol/L~214μmol/L,检出限为0.03μmol/L。
[Abstract]:The presence of phenols in oilfield wastewater is extremely harmful to animals, plants and the environment, so it is of great significance for the real-time detection and control of phenols. Compared with the standard method of 4-aminotepyrine, the electrochemical analysis method has the advantages of simple operation, high sensitivity and real-time detection. The application of this method to detect phenols has important scientific significance and application prospect. In this paper, the surface of polymer, carbon nanotube or gold nanoparticles modified electrode was used to prepare working electrode. The electrochemical behavior of phenols on the modified electrode was studied by cyclic voltammetry. Electrochemical impedance method was used to characterize the electrochemical performance of the modified electrode. The standard curve and detection limit were determined by differential pulse voltammetry. The work of this paper is summarized as follows: (1) Phenol is measured by polyzinc-modified carbon paste electrode at a scanning rate of 100 MV / s, and pH of phosphate buffer solution is 7.0. The detection limit of phenol was 9 脳 10 ~ (-6) mol / L, and the linear range was 21 渭 mol/L~292 / L ~ (357) 渭 mol / L ~ (-1) 路L ~ (-2). The MWCNT/Poly-SA composite electrode was successfully prepared by using poly (pentanesulfonylsalicylic acid) and carbon nanotube modified electrode. Under the optimum conditions, the detection limit and linear range of catechol were determined to be: 0. 16 渭 mol / L ~ (3) 渭 mol / L ~ (3) mol/L~240 路L ~ (-1) 路L ~ (3)) electrodeposition of gold nanoparticles onto the surface of carbon paste electrode and polypentesulfonylsalicylic acid, respectively. Carbon nanotube modified electrodes are used to measure o-nitrophenol and phenol. The results show that the difference between peak potential and peak potential of o-nitrophenol (0.932V) and phenol (0.679V) can be distinguished by 0.3 V. Under the optimal conditions, the linear range of o-nitrophenol is 2 渭 mol/L~214 渭 mol / L and the detection limit is 0.03 渭 mol / L.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X741;O657.1

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