Chang Fengxia, Wang Hongyue, He Shuai, Gu Yu, Zhu Wenjie, Li Tanwei, Ma Runhui
School of Chemistry and Environment, Southwest Minzu University Chengdu 610041 P. R. China
RSC Adv. 2021 Sep 28;11(51):31950-31958. doi: 10.1039/d1ra06032e. eCollection 2021 Sep 27.
A reduced graphene oxide-polydopamine-carboxylated multi-walled carbon nanotube (RGO-PDA-cMWCNT) nanocomposite was fabricated a facile, one-pot procedure and was characterized by a variety of techniques. A novel electrochemical sensor based on RGO-PDA-cMWCNT was constructed to determine hydroquinone (HQ) and catechol (CT) simultaneously. This newly prepared nanocomposite shows excellent electrocatalytic efficacy in the electrode reaction of the two isomers. Specifically, the peak-to-peak potential difference between the two dihydroxybenzenes is 115 mV for oxidation, which is obviously larger than similar electrochemical sensors. The established method displays a wide linear range from 0.5 to 5000 μM with a detection limit (S/N = 3) of 0.066 μM for HQ and 0.073 μM for CT. In addition, this electrochemical approach has been tested to measure the two dihydroxybenzenes in real samples and satisfactory results were recorded.
通过简便的一锅法制备了还原氧化石墨烯-聚多巴胺-羧基化多壁碳纳米管（RGO-PDA-cMWCNT）纳米复合材料，并采用多种技术对其进行了表征。构建了一种基于RGO-PDA-cMWCNT的新型电化学传感器，用于同时测定对苯二酚（HQ）和邻苯二酚（CT）。这种新制备的纳米复合材料在两种异构体的电极反应中表现出优异的电催化效果。具体而言，两种二羟基苯氧化时的峰-峰电位差为115 mV，明显大于类似的电化学传感器。所建立的方法线性范围宽，为0.5至5000 μM，对HQ的检测限（S/N = 3）为0.066 μM，对CT的检测限为0.073 μM。此外，该电化学方法已用于实际样品中两种二羟基苯的测定，并记录到了满意的结果。
