Recently, the team of Professor Liu Shaoqin of the Micro-Nano Technology Research Center of the Institute of Basic and Interdisciplinary Science has made new progress in the anode material of microbial fuel cells. The team synthesized iron disulfide / graphene composite (FeS2 / rGO) as the anode of the microbial fuel cell through a simple hydrothermal reaction, and used it for the treatment of brewery wastewater, obtaining a higher voltage, power density and Good organic matter removal rate. The research results were published in the internationally renowned journal "Advanced Materials" (Advanced Materials, impact factor 21.950).
With the increase of population and the development of modern society, people are producing more and more garbage and waste water. The traditional sewage treatment process is at the cost of high energy consumption, material consumption and greenhouse gas emissions, and at the same time wastes the chemical energy contained in the organic matter of the wastewater. Therefore, it is economical to develop new technologies and methods for recycling available resources and energy in the efficient treatment of wastewater And ecological benefits.
Microbial fuel cells can use electricity-generating microorganisms to catalyze the degradation of organic matter and convert the chemical energy contained in the organic matter into electrical energy, which has the advantages of clean and efficient and recycling. Therefore, in recent years, the research of microbial fuel cell anode materials has attracted wide attention of scientists from various countries. However, the premise and difficulty of the industrialization of electricity-producing microorganisms for catalytic degradation of organic matter lies in how to greatly improve the efficiency of electricity generation by microorganisms for catalytic degradation of organic matter. Only by designing a suitable anode material can the adhesion of microorganisms and the efficiency of electron transfer be enhanced to increase productivity. The research results of Professor Liu Shaoqin's team have proposed a new strategy to improve the performance of microbial fuel cells.
The team designed the FeS2 / rGO anode material based on the characteristics of the electricity-producing microorganisms that can use Fe3 + and S as electron transfer channels. This composite nanomaterial not only greatly improves the adhesion ability of the electricity-generating microorganisms on the electrode surface, but also facilitates the competition of the electricity-generating microorganisms with other bacteria in the community, and realizes the selective enrichment of the electricity-generating microorganisms, thereby fueling the microorganisms. The start-up cycle of the battery has been reduced from more than ten days to two days with conventional carbon cloth electrodes, greatly improving the performance of the microbial fuel cell. At the same time, the introduction of FeS2 nanoparticles significantly reduces the charge transfer impedance of the electrode, promotes the electron transfer between the microbe-electrode interface, obtains a surface power density of up to 3.22 W / m2, and has a high Organic removal rate.
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