Thermo-electrochemical reduction of sulfate to sulfide using a graphite cathode
Thermo-electrochemical reduction of sulfate to sulfide using a graphite cathode
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DOI：
10.1023/a:1003455219932
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发表时间：
1998-10-01
影响因子：
2.9
通讯作者：
Tributsch, H
中科院分区：
文献类型：
--
作者：
Bilal, BA;Tributsch, H
提出了一种以石墨炭为电极，将硫酸盐还原为硫化物的热电化学法，电流效率可达80%。该机制需要未解离的硫化物(6.5M H_2SO_4)，在接近120摄氏度的温度下工作，在低过电位和没有放氢的情况下进行。根据电化学和光电子能谱数据，讨论了一个描述H_2SO_4与石墨碳晶格相互作用导致H_2S释放的分子模型。讨论了该工艺在能源和环境技术(硫化物作为二氧化碳还原化能自养细菌的能源)和消除硫酸废物方面的应用。
A thermoelectrochemical process which allows reduction of sulfate to sulfide with current efficiency of 80% using graphitic carbon as an electrode is presented. The mechanism which requires undissociated sulfide (6.5 M H2SO4) and works at temperatures close to 120 degrees C, proceeds at low overpotential and in the absence of hydrogen evolution. A molecular model describing the interaction of H2SO4 With the carbon lattice of graphite leading to the liberation of H2S is discussed on the basis of electrochemical and photoelectron spectroscopic data. Applications of this process in energy and environmental technology (sulfide as energy source for CO2 reducing chemoautotrophic bacteria) and for elimination of sulfuric acid waste are discussed.