含氮多孔碳限域金纳米粒子用于电化学检测液相二氧化氯

Au Nanoparticles Confined in N-Doped Porous Carbon for Detection of Chlorine Dioxide in Liquid Phase

目前,二氧化氯(ClO_(2))消毒剂已成为最受人们青睐的绿色消毒剂之一。虽然人们广泛应用ClO_(2)消毒剂于各个领域,但有关ClO_(2)浓度检测的研究报道却比较少。因此,开发新型敏感材料用于检测液相ClO_(2)显得尤为重要。以聚吡咯为氮源,与KOH混合烧结后得到的含氮多孔碳(NPC)作为基底,负载金纳米粒子后经高温煅烧去除表面活性剂,得到含氮多孔碳负载金纳米粒子催化剂(NPC-Au-P)。与传统方法制备的氮掺杂碳负载金纳米粒子相比,NPC-Au-P中多孔结构可限域金纳米粒子,使其在经过高温煅烧后仍可以保持较小的尺寸,因此具有较高的催化活性。在电化学检测液相ClO_(2)方面,NPC-Au-P表现出较高的灵敏度(29.77L·mA/mol)以及较低的检出限(0.12μmol/L)。

At present,chlorine dioxide(ClO_(2))has become one of the most popular green disinfectants.Although ClO_(2) disinfectant has been widely used in various domains,there are few survey reports on the detection of ClO_(2) concentration.Therefore,it becomes an urgent demand to develop new catalyst materials for detection of ClO_(2) in liquid phase.Using polypyrrole as the nitrogen source,the N-doped porous carbon(NPC)is obtained by mixing and annealing with KOH as the substrate.After the loading of gold nanoparticles,the surface active agent is removed by high-temperature pyrolysis,and the Au nanoparticles embedded in N-doped porous carbon catalyst(NPC-Au-P)are obtained.Compared with the N-doped carbon supported Au nanoparticles prepared by traditional methods,the porous structure of NPC-Au-P can limit the domain of Au nanoparticles,which can maintain a smaller size after high temperature pyrolysis,so it has higher catalytic activity.For electrochemical detection of ClO_(2) in the liquid phase,NPC-Au-P has a high sensitivity of 29.77 L·mA/mol and a low detection limit of 0.12μmol/L.