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Promoted Sb removal with hydrogen production in microbial electrolysis cell by ZIF-67-derived modified sulfate-reducing bacteria bio-cathode

Dai, Junxi (author)
Guangzhou Univ, Peoples R China
Huang, Zhongyi (author)
Guangzhou Univ, Peoples R China
Zhang, Hongguo (author)
Guangzhou Univ, Guangzhou Univ Linkoping Univ Res Ctr Urban Sustai, Guangzhou 510006, Peoples R China; Guangzhou Univ, Peoples R China
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Shi, Huihui (author)
Guangzhou Univ, Peoples R China
Arulmani, Samuel Raj Babu (author)
Guangzhou Univ, Peoples R China
Liu, Xianjie (author)
Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
Huang, Lei (author)
Guangzhou Univ, Peoples R China
Yan, Jia (author)
Guangzhou Univ, Peoples R China
Xiao, Tangfu (author)
Guangzhou Univ, Peoples R China
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 (creator_code:org_t)
ELSEVIER, 2023
2023
English.
In: Science of the Total Environment. - : ELSEVIER. - 0048-9697 .- 1879-1026. ; 856
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Bio-cathode Microbial electrolysis cell (MEC) has been widely discovered for heavy metals removal and hydrogen production. However, low electron transfer efficiency and heavy metal toxicity limit MEC treatment efficiency. In this study, ZIF-67 was introduced to modify Sulfate-reducing bacteria (SRB) bio-cathode to enhance the bioreduction of sulfate and Antimony (Sb) with hydrogen production in the MEC. ZIF-67 modified bio-cathode was developed from a bio-anode microbial fuel cell (MFC) by operating with an applied voltage of 0.8 V to reverse the polarity. Cyclic voltammetry, linear sweep voltammetry and electrochemical impedance were done to confirm the performance of the ZIF67 modified SRB bio-cathode. The synergy reduction of sulfate and Sb was accomplished by sulfide metal precipitation reaction from SRB itself. Maximum sulfate reduction rate approached 93.37 % and Sb removal efficiency could reach 92 %, which relies on the amount of sulfide concentration generated by sulfate reduction reaction, with 0.923 +/- 0.04 m(3) H-2/m(3) of hydrogen before adding Sb and 0.857 m(3) H-2/m(3) of hydrogen after adding Sb. The hydrogen was mainly produced in this system and the result of gas chromatography (GC) indicated that 73.27 % of hydrogen was produced. Meanwhile the precipitates were analyzed by X-ray diffraction and X-ray photoelectron spectroscopy to confirm Sb2S3 was generated from Sb (V).

Subject headings

NATURVETENSKAP  -- Kemi -- Annan kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)

Keyword

Metal-organic frameworks; Biofilm; Electron transfer efficiency; Sulfate-reducing bacteria; Heavy metal removal

Publication and Content Type

ref (subject category)
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