Process and kinetics of azo dye decolourization in bioelectrochemical systems: effect of several key factors

被引：35

作者：

Yang, Hou-Yun ^{[1
]}

He, Chuan-Shu ^{[1
]}

Li, Lei ^{[1
]}

Zhang, Jie ^{[1
]}

Shen, Jin-You ^{[2
]}

Mu, Yang ^{[1
,2
]}

Yu, Han-Qing ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Chem, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Peoples R China

[2] Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Jiangsu, Peoples R China

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

关键词：

MICROBIAL FUEL-CELLS; ELECTRICITY-GENERATION; ELECTRON-TRANSFER; METHYL-ORANGE; DECOLORIZATION; CHAMBER; REMOVAL; PERFORMANCE; REDUCTION; ACETATE;

D O I：

10.1038/srep27243

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

This study explored the influence of several key factors on the process and kinetics of azo dye decolourization in bioelectrochemical systems (BESs), including cathode potential, dissolved oxygen (DO) concentration of catholyte and biofilm formed on the cathode. The results show that azo dye methyl orange (MO) decolourization in the BES could be well described with the pseudo first-order kinetics. The MO decolourization efficiency increased from 0 to 94.90 +/- 0.01% and correspondingly the reaction rate constant increased from 0 to 0.503 +/- 0.001 h(-1) with the decrease in cathodic electrode potential from -0.2 to -0.8 V vs Ag/AgCl. On the contrary, DO concentration of the catholyte had a negative impact on MO decolourization in the BES. When DO concentration increased from zero to 5.80 mg L-1, the MO decolourization efficiency decreased from 87.19 +/- 4.73% to 27.77 +/- 0.06% and correspondingly the reaction rate constant reduced from 0.207 +/- 0.042 to 0.033 +/- 0.007 h(-1). Additionally, the results suggest that the biofilm formed on the cathode could led to an adverse rather than a positive effect on azo dye decolourization in the BES in terms of efficiency and kinetics.

引用

页数：9

共 46 条

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