Release time:2021-03-15  Hits:

• Key Words:MICROBIAL FUEL-CELLS; AUTOTROPHIC DENITRIFICATION; CONTAMINATED GROUNDWATER; ELECTRICITY-GENERATION; SELECTIVE REDUCTION; NITROGEN REMOVAL; GRAPHENE OXIDE; CARBON NITRIDE; WASTE-WATER; VANADIUM V
• Abstract:With the continuous development of the chemical industries, synergistic removal of carbon and nitrogen contaminants has drawn much attention. In this work, a novel strategy for the synergistic removal of methyl orange (MO) and nitrate was developed in a single reactor by combining a TiO2/g-C3N4 nanosheet/graphene photoanode and denitrifying biofilm cathode. Under xenon light illumination, the photocatalytic MO decolorization rate exceeded 90% (the initial concentration of MO was as high as 100 mg.L-1) with a biocathode potential bias of -0.5 V vs Ag/AgCl; additionally, the decolourization rate apparently followed first-order kinetics with a constant of 0.11 +/- 0.02 h(-1). The improved MO decolourization rate was mainly because the biocathode effectively enhanced the charge separation of the photogenerated charge at the TiO2/g-C3N4 nanosheet/graphene photoanode interface. In the meantime, the effluent nitrate was lower than 1 mg.N.L-1 at a biocathode potential of -0.5 V vs Ag/AgCl. The results indicated that the coupled biocathode-photoanode system could serve the purpose of simultaneously degrading MO and accomplishing nitrate reduction. Considering the sustainability of sunlight and the use of a biocathode, the coupled biocathode-photoanode system is a promising alternative for the simultaneous removal of biorefractory organics and nitrate. (C) 2019 Elsevier B.V. All rights reserved.
• Volume:132
• Issue:wu
• Translation or Not:no