The purpose of this study was to prepare amorphous silicon monoxide (SiO) at a low-temperature using a thermoelectric field coupling method. The sample was heated directly by an electric current using silicon (Si) and silicon dioxide (SiO 2 ) as raw materials. Experimental conditions included a stoichiometric mass ratio of raw materials, 10–13 pct conductive graphite doping, an external electric field of 600 V/cm, a current density of 10.57 A/cm 2 , and a furnace temperature range of 300–480 °C in a vacuum environment. A reddish-brown gas condensate with a Si:SiO 2 atomic fraction ratio of 49.86:50.14 was successfully prepared. The real-time voltage measurements divided the process into four stages. Results showed this method prepared amorphous SiO powder at a lower temperature, reducing furnace temperature by nearly 1000 °C compared to traditional methods, which is significant for lowering crucible temperatures in industrial silicon monoxide production.
Lan Li,Mingna Feng,Mingxia Wang,Zhihao Jiao,Jixue Li,Linfang Dong,Feng Yan
Background In order to improve the selective separation performance of the membrane for Li + and enhance the separation efficiency, a crown ether functionalized polysulfone membrane was prepared in this paper, and the Li + was separated by electrodialysis process. Methods Chloromethylated polysulfone (CMPSf) was used as the base membrane, 4′-aminobenzo-12-crown-4-ether (AB12C4) was in-situ grafted onto the surface of CMPSf membrane to obtain the PSf-sg-AB12C4 membrane. The chemical structure of the membrane surface was characterized by ATR-FTIR and XPS. The surface and cross-sectional morphologies of the membrane were characterized by FESEM. The PSf-sg-AB12C4 membrane was used for selective separation of Li + by membrane coupling with electric field. Fingings The results show that the CMPSf membranes and the PSf-sg-AB12C4 porous membrane have almost no selective separation performance for Li + , while the PSf-sg-AB12C4 dense membrane can selectively separate Li + . After optimizing the conditions of voltage, ion concentration and solution pH, the separation factor of the PSf-sg-AB12C4 dense membrane for Mg 2+ to Li + is up to 32.6. In addition, the separation factors of coexisting ions such as Na + , K + , Ca 2+ to Li + are all higher than that of Mg 2+ to Li + , suggesting that the PSf-sg-AB12C4 dense membrane is a promising material for selective separation of Li + from brine.
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