Carbon nanotubes mediating nano α-FeOOH reduction by Shewanella putrefaciens CN32 to enhance tetrabromobisphenol A removal

Hui Li; Wei Cao; Wenbing Wang; Yuan Huang; Minghui Xiang; Chen Wang; Shuai Chen; Ruofan Si; Maofang Huang

doi:10.1016/j.scitotenv.2021.146183

Carbon nanotubes mediating nano α-FeOOH reduction by Shewanella putrefaciens CN32 to enhance tetrabromobisphenol A removal

Sci Total Environ. 2021 Jul 10:777:146183. doi: 10.1016/j.scitotenv.2021.146183. Epub 2021 Mar 3.

Authors

Hui Li¹, Wei Cao¹, Wenbing Wang¹, Yuan Huang¹, Minghui Xiang², Chen Wang³, Shuai Chen⁴, Ruofan Si¹, Maofang Huang¹

Affiliations

¹ School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, PR China.
² School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, PR China. Electronic address: xiangmh@shu.edu.cn.
³ School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, PR China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
⁴ School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, China.

PMID: 33689900
DOI: 10.1016/j.scitotenv.2021.146183

Abstract

Carbon nanotubes (CNTs) mediation of the reduction of nano goethite (α-FeOOH) by Shewanella putrefaciens CN32 to improve the removal efficiency of tetrabromobisphenol A (TBBPA) was investigated in this study. The results showed that CNTs effectively promoted the biological reduction of α-FeOOH by strengthening the electron transfer process between Shewanella putrefaciens CN32 and α-FeOOH. After α-FeOOH was reduced to Fe(II), the adsorbed Fe(II) accounted for approximately 69.07% of the total Fe(II). And the secondary mineral vivianite was formed during the reduction of α-FeOOH, which was determined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The vivianite (Fe^II₃(PO₄)₂·8H₂O) was formed by the reaction of PO₄^3- and Fe(II). The degradation effect of TBBPA was the best at pH 8. CNT-α-FeOOH reduced the toxicity of TBBPA to CN32 and had good stability and reusability. The byproduct bisphenol A was detected which indicated that the degradation pathway of TBBPA involved reductive debromination. Electrochemical experiments and EPR analysis showed that the electron transfer capacities (ETC) of CNTs was an important factor in the removal of TBBPA, and it may greatly depend on semiquinone radicals (CO). This study provided a new method and theoretical support for the removal of TBBPA in the environment.

Keywords: Carbon nanotubes; Nano goethite; TBBPA; Vivianite.

MeSH terms

Iron Compounds
Minerals
Nanotubes, Carbon*
Oxidation-Reduction
Polybrominated Biphenyls
Shewanella putrefaciens*

Substances

Iron Compounds
Minerals
Nanotubes, Carbon
Polybrominated Biphenyls
goethite
tetrabromobisphenol A