Ion Chromatographic Determination of Hydrazine in Excess Ammonia for Monitoring Graphene Oxide Reduction Reactionстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 октября 2019 г.
Аннотация:A new ion chromatography method for hydrazine in excess ammonia solutions has been developed to monitor graphene oxide (GO) reduction reactions. The method is based on the monitoring of hydrazine consumption during the reduction process using ion-exchange chromatography coupled with electrochemical detection. The developed analytical protocol overcame the significant practical challenges of atmospheric hydrazine oxidation, and it minimised the matrix interference in both separation and detection that results from the excess of ammonium with respect to hydrazine (up to 5.8 × 104 times) in GO reduction experiments. Chromatographic separations were achieved using a high capacity IonPac CS16 cation-exchange column with a 30 mM methanesulfonic acid (MSA) eluent, within an analysis time of less than 20 min. Detection of hydrazine using electrochemical detector was linear between 10 μM and 4 mM, with LOD and LOQ values of 3 μM and 10 μM, respectively. Standard additions confirmed 103 ± 0.8% recovery. The developed method was successfully used to determine the point of complete GO reduction with hydrazine. Reaction curves for GO reduction generated using the method were compared to results from Fourier-transform infrared spectroscopy and Raman spectroscopy to verify the utility of the approach.