文献类型：期刊文献

英文题名：Novel route to synthesize complex metal sulfides: Hydrothermal coupled dissolution-reprecipitation replacement reactions

作者：Xia, Fang[2];Zhou, Jinwen[1,5];Brugger, Joel[1,3];Ngothai, Yung[2];O'Neill, Brian[2];Chen, Guorong[4];Pring, Allan[1,5]

机构：[1]S Australian Museum, Dept Mineral, Adelaide, SA 5000, Australia;[2]Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;[3]Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia;[4]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[5]Flinders Univ S Australia, Sch Chem Phys & Earth Sci, Adelaide, SA 5001, Australia

年份：2008

卷号：20

期号：8

起止页码：2809

外文期刊名：CHEMISTRY OF MATERIALS

收录：;EI(收录号：20082011259939);WOS:【SCI-EXPANDED(收录号:WOS:000255019300031)】；

语种：英文

外文关键词：Dissolution - Flow of fluids - Hydrothermal synthesis - Precipitation (chemical) - Reaction kinetics - Stoichiometry

摘要：A novel route for the synthesis of complex metal sulfides using hydrothermal coupled dissolution-reprecipitation reactions is reported. Two thiospinels, (Ni,Fe)(3)S-4 (violarite) and Co3S4 (linnaeite), were synthesized using (Fe,Ni)(9)S-8 (pentlandite) and Co9S8 (cobaltpentlandite) as precursors. The Fe/Ni ratio of (Ni,Fe)(3)S-4 can be adjusted by varying the reaction conditions, for example, temperature (125-145 degrees C), pH (2.90, 3.90, 5.00), and precursor stoichiometry ((FexNi1-x)(9)S-8, x = 0.4, 0.5, 0.55, 0.6). Pure (Ni,Fe)(3)S-4 can be synthesized by utilizing a flow-through hydrothermal cell rather than a static hydrothermal cell as the fluid flow improves mass transfer and flushes away the Fe2O3 byproduct from the reaction front. Synthesis times range from 10 to 20 days, compared to the traditional dry synthesis route for (Ni,Fe)(3)S-4 that requires 3 months annealing to obtain a product of only 72 +/- 3 wt % purity. This synthesis route is ideal for preparing compounds with low thermal stabilities (<500 degrees C).