Efficient and synergistic decolourization and nitrate removal using a single-chamber with a coupled biocathode-photoanode system

被引：0

作者：

Su S. ^{[1
]}

Zhang Y. ^{[1
]}

Hu W. ^{[1
]}

Zhang X. ^{[1
]}

Ju D. ^{[1
]}

Jia C. ^{[1
]}

Liu J. ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao

来源：

Bioelectrochemistry | 2020年 / 132卷

关键词：

Biocathode; Denitrification; Photoanode; Photoelectrocatalytic oxidation;

D O I：

10.1016/j.bioelechem.2019.107439

中图分类号：

学科分类号：

摘要：

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. © 2019 Elsevier B.V.

引用

共 51 条

[1] Bhateria R., Jain D., Water quality assessment of lake water: a review, Sustainable Water Resour. Manage., 2, pp. 161-173, (2016)
[2] Wang Z., Zhang B., Borthwick A.G.L., Feng C., Ni J., Utilization of single-chamber microbial fuel cells as renewable power sources for electrochemical degradation of nitrogen-containing organic compounds, Chem. Eng. J., 280, pp. 99-105, (2015)
[3] Zhang L., Zhang C., Hu C., Liu H., Bai Y., Qu J., Sulfur-based mixotrophic denitrification corresponding to different electron donors and microbial profiling in anoxic fluidized-bed membrane bioreactors, Water Res., 85, pp. 422-431, (2015)
[4] Du Y., Feng Y., Qu Y., Liu J., Ren N., Liu H., Electricity generation and pollutant degradation using a novel biocathode coupled photoelectrochemical cell, Environ. Sci. Technol., 48, pp. 7634-7641, (2014)
[5] Liu J., Li M., Wang J., Song Y., Jiang L., Murakami T., Fujishima A., Hierarchically macro-/mesoporous Ti-Si oxides photonic crystal with highly efficient photocatalytic capability, Environ. Sci. Technol., 43, pp. 9425-9431, (2009)
[6] Chen Y., Huang W., He D., Situ Y., Huang H., Construction of Heterostructured g-C3N4/Ag/TiO2 Microspheres with Enhanced Photocatalysis Performance under Visible-Light Irradiation, ACS Appl. Mater. Interfaces, 6, pp. 14405-14414, (2014)
[7] Wang H., Liang Y., Liu L., Hu J., Wu P., Cui W., Enriched photoelectrocatalytic degradation and photoelectric performance of BiOI photoelectrode by coupling rGO, Appl. Catal. B: Environ., 208, pp. 22-34, (2017)
[8] Cai R., Zhang B., Shi J., Li M., He Z., Rapid photocatalytic decolorization of methyl orange under visible light using VS4/carbon powder nanocomposites, ACS Sustain. Chem. Eng., 5, pp. 7690-7699, (2017)
[9] Cheng H.-Y., Tian X.-D., Li C.-H., Wang S.-S., Su S.-G., Wang H.-C., Zhang B., Sharif H.M.A., Wang A.-J., Microbial photoelectrotrophic denitrification as a sustainable and efficient way for reducing nitrate to nitrogen, Environ. Sci. Technol., 51, pp. 12948-12955, (2017)
[10] Lin Z.-Q., Yuan S.-J., Li W.-W., Chen J.-J., Sheng G.-P., Yu H.-Q., Denitrification in an integrated bioelectro-photocatalytic system, Water Res., 109, pp. 88-93, (2017)

← 1 2 3 4 5 6 →