Li Lin, Ghahreman Ahmad
The Robert M. Buchan Department of Mining Engineering, Queen's University, 25 Union Street, Kingston, Ontario, Canada K7L 3N6.
ACS Omega. 2020 Sep 14;5(38):24871-24880. doi: 10.1021/acsomega.0c03613. eCollection 2020 Sep 29.
A simple one-step hydrothermal method was developed to synthesize pyrite (FeS) sheet- and bulklike pyrite mineral. The Fe/S molar ratio determines the phase of FeS, including pyrite and marcasite. The reaction temperature and time are key factors to regulate the structure, morphology, and size of pyrite. Scanning electron and transmission electron microscopy showed the formation of monodisperse microspherulite within 1 h reaction time, and the particles aggregated to large irregular polyhedron particles with increasing reaction time up to 4 h. Electrochemical oxidation tests demonstrated that their electrochemical activity significantly decreased with increasing synthesis time. At an elevated temperature of 200 °C, bulk pyrite was obtained after a 24 h reaction time, which could have promising applications in hydrothermal pyrite ore oxidation research.
开发了一种简单的一步水热法来合成片状和块状黄铁矿（FeS）矿物。铁/硫摩尔比决定了FeS的相，包括黄铁矿和白铁矿。反应温度和时间是调节黄铁矿结构、形态和尺寸的关键因素。扫描电子显微镜和透射电子显微镜显示，在1小时的反应时间内形成了单分散微球粒，随着反应时间增加至4小时，颗粒聚集成大的不规则多面体颗粒。电化学氧化测试表明，它们的电化学活性随着合成时间的增加而显著降低。在200°C的高温下，经过24小时的反应时间得到了块状黄铁矿，其在热液黄铁矿矿石氧化研究中可能具有广阔的应用前景。
