Co-substrate-Assisted Dimethyl Sulfide Degradation and Electricity Generation in a Microbial Fuel Cell

Abstract

Dimethyl sulfide (DMS) emitted from the petrochemical industry is a typical volatile organic sulfur compound (VOSC) with poor solubility and odorous smell. A microbial fuel cell (MFC) is regarded as an appreciative method for simultaneous DMS degradation and electricity generation. In this work, for the first time, we developed an MFC system for DMS treatment. With an initial concentration of 95 mg L −1 , the DMS removal efficiency at the closed-circuit state was achieved as high as 89.5% within 40 h, which was 1.21 times higher than that at the open-circuit state. The maximum power density and current density were 0.237 mW m −2 and 2.644 mA m −2 , respectively. The dominant electrogenic bacteria in the MFC were Stenotrophomonas, Pseudomonas, and Candidatus Microthrix, and the DMS degraders included Thiobacillus, Truepera, and Candidatus Microthrix. Direct extracellular electron transfer was involved in the bioanode for DMS degradation according to the CV curves. Moreover, to overcome the toxicity of high-concentration DMS on microorganisms and enhance power generation, sodium acetate (NaAc) was added as a co-substrate, resulting in 52.5% increase in DMS degradation activity and a 16.5 times higher maximum output voltage. Overall, these findings may offer basic information for bioelectrochemical degradation of DMS and facilitate the application of MFCs in waste gas treatment.

Roles of Oxygen Species in Low-Temperature Catalytic o-Xylene Oxidation on MOF-Derived Bouquetlike CeO2

“…Recently, a large number of volatile organic compounds (VOCs) emitted by human activities have caused serious environmental and social problems. − For example, benzene, toluene, and xylene (BTX), which are widely utilized as important chemical raw materials and organic solvents in the industrial production of medicine and building decoration materials, can endanger public health and the environment. − Catalytic combustion is an effective treatment method that can convert BTX into harmless water and carbon dioxides. , However, commercial catalytic combustion always needs to be operated at moderate temperature (about 300–450 °C), which still meets the demand for auxiliary fuel consumption or VOCs preconcentration. To reduce the cost of VOCs removal, the catalytic combustion system needs to be operated at a lower temperature, such as <200 °C.…”

The Role of Dual Vacancies in TiO2 for Enhanced Photocatalytic Hydrogen Generation and Pollutants Removal

“…To further investigate the effect of different types of vacancies on charge separation and transfer capability, density functional theory (DFT) was applied to calculate three types of vacancies [43–45] . The modulation of the electronic structure by the three types of vacancies and the charge distribution at the interface was described in DFT calculations, where the energy band structure and density of states were calculated [46,47] .…”

“…To further investigate the effect of different types of vacancies on charge separation and transfer capability, density functional theory (DFT) was applied to calculate three types of vacancies. [43][44][45] The modulation of the electronic structure by the three types of vacancies and the charge distribution at the interface was described in DFT calculations, where the energy band structure and density of states were calculated. [46,47] Charge densities were calculated for the three types of vacancies, revealing the electron density of the atoms adjacent to the single Ti vacancy (contains only Ti vacancies, single-V Ti ) varied more significantly, but the electron density of the atoms adjacent to the single O vacancy (contains only O vacancies, single-V O ) had little difference, which was consistent with the binding energy variation in the Ti 2p and O 1s XPS spectra.…”

Shifts of the Rate-Limiting Step in Airlift Microbial Electrolysis Cells for Gaseous Propanethiol Degradation

“…Even though the AL-MEC system has been proven to be an efficient alternative, considering the higher biotoxicity of VOSCs compared with ordinary pollutants, the degradation reaction rate of PT in it needs to be further strengthened . The bioanode in the AL-MEC system with a positive potential acts as an electron acceptor to promote electron flow in degradation reactions .…”