Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning 530001, P. R. China.
Anal Methods. 2021 Mar 7;13(9):1110-1120. doi: 10.1039/d0ay02240c. Epub 2021 Feb 15.
Three-dimensional hierarchically porous carbon (denoted as SA-900) with a microporous, mesoporous and macroporous structure was facilely fabricated via direct carbonization of sodium alginate. SA-900 was fully characterized by N adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction and Raman spectroscopy to confirm its structure. SA-900 was coated onto a glassy carbon electrode surface to construct an ultrasensitive electrochemical sensing platform (SA-900/GCE). Electrochemical behaviors of hydroquinone (HQ), catechol (CC) and resorcinol (RC) on the SA-900/GCE surface were investigated, and it was found that SA-900 possesses excellent electrocatalytic activity towards them. Experimental conditions including carbonization temperature, pH value, SA-900 concentration, accumulation potential and accumulation time were optimized for quantitative assay. Under optimized conditions, linear ranges for simultaneous determination of HQ, CC and RC are 0.05-1.50 μM, 0.05-1.50 μM and 0.50-15.00 μM, respectively. Detection limits for HQ, CC and RC are calculated to be 0.0183 μM, 0.0303 μM and 0.3193 μM (S/N = 3). The SA-900/GCE based electrochemical sensing platform is applied for determining HQ, CC and RC in lake water samples with satisfactory results.
三维分级多孔碳（记为 SA-900）具有微孔、介孔和大孔结构，通过海藻酸钠的直接碳化制备。通过氮气吸附-脱附、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射和拉曼光谱对 SA-900 进行了充分的表征，以确认其结构。将 SA-900 涂覆在玻碳电极表面上，构建了一个超灵敏的电化学传感平台（SA-900/GCE）。研究了对苯二酚（HQ）、邻苯二酚（CC）和间苯二酚（RC）在 SA-900/GCE 表面上的电化学行为，发现 SA-900 对它们具有优异的电催化活性。对碳化温度、pH 值、SA-900 浓度、积累电位和积累时间等实验条件进行了优化，以进行定量分析。在优化条件下，HQ、CC 和 RC 的同时测定线性范围分别为 0.05-1.50 μM、0.05-1.50 μM 和 0.50-15.00 μM。HQ、CC 和 RC 的检测限分别计算为 0.0183 μM、0.0303 μM 和 0.3193 μM（S/N = 3）。基于 SA-900/GCE 的电化学传感平台用于测定湖水样品中的 HQ、CC 和 RC，结果令人满意。
