摘要:
采用滴涂法将碳纳米管-纳米氧化锡复合材料修饰于玻碳电极表面，制备电化学传感器，应用循环伏安法探究对苯二酚在电极上的氧化还原行为。研究表明：当碳纳米管含量为5 mg/mL、纳米氧化锡含量为3 mg/mL、扫描速率为100 mV/s、磷酸缓冲溶液pH=6.0时，测得对苯二酚的线性范围为5.0×10-4 ~ 5.0×10-7 mol/L，检测限达8.0×10-8 mol/L，相对标准偏差为5.4%~6.8%。水样中对苯二酚的加标回收率在93.0% ~105%之间。该方法快速简便、准确灵敏，有望用于实际化工行业废水中酚类污染物的检测。
关键词: 碳纳米管；纳米氧化锡；电化学传感器；对苯二酚
Abstract: Carbon nanotubes and tin oxide nanocomposites are placed on the surface of a glassy carbon electrode by drop-coating to prepare an electrochemical sensor. Cyclic voltammetry is applied to investigate the redox behavior of hydroquinone on the electrode. It is shown that when the content of carbon nanotubes reaches 5 mg/mL, the content of tin oxide nanoparticles is 3 mg/mL, the scanning rate is 100 mV/s, and the pH of phosphate buffer solution is pH=6.0, the linear range of hydroquinone is 5.0×10-4 ~ 5.0×10-7 mol/L, and the limit of detection is up to 8.0×10-8 mol/L, with a relative standard deviation (RSD) of 5.4%~6.8%. The recoveries of hydroquinone in water samples ranged from 93.0% to 105%. The method shows quick results, simple operation, accurate and sensitive data, and hopefully can be used for the detection of phenolic pollutants in actual chemical wastewater.
Keywords: carbon nanotubes; tin oxide nanoparticles; electrochemical sensor; hydroquinone
关键词: 碳纳米管；纳米氧化锡；电化学传感器；对苯二酚
Abstract: Carbon nanotubes and tin oxide nanocomposites are placed on the surface of a glassy carbon electrode by drop-coating to prepare an electrochemical sensor. Cyclic voltammetry is applied to investigate the redox behavior of hydroquinone on the electrode. It is shown that when the content of carbon nanotubes reaches 5 mg/mL, the content of tin oxide nanoparticles is 3 mg/mL, the scanning rate is 100 mV/s, and the pH of phosphate buffer solution is pH=6.0, the linear range of hydroquinone is 5.0×10-4 ~ 5.0×10-7 mol/L, and the limit of detection is up to 8.0×10-8 mol/L, with a relative standard deviation (RSD) of 5.4%~6.8%. The recoveries of hydroquinone in water samples ranged from 93.0% to 105%. The method shows quick results, simple operation, accurate and sensitive data, and hopefully can be used for the detection of phenolic pollutants in actual chemical wastewater.
Keywords: carbon nanotubes; tin oxide nanoparticles; electrochemical sensor; hydroquinone