Citation: Lin Weifen, Chen Nianjia, You Lexing, Zhou Shungui. Shewanella oneidensis MR-1 Affects the Mechanism of Cd Electrodeposition on Glassy Carbon Electrode[J]. Acta Chimica Sinica, ;2018, 76(7): 543-548. doi: 10.6023/A18030111 shu

Shewanella oneidensis MR-1 Affects the Mechanism of Cd Electrodeposition on Glassy Carbon Electrode

Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002

Corresponding author: You Lexing, lxyou@fafu.edu.cn
Received Date: 23 March 2018
Available Online: 11 July 2018
Fund Project: the National Natural Science Foundation of China 21603031the Natural Science Foundation of Fujian Province 2018J01668Project supported by the National Natural Science Foundation of China (No. 21603031) and the Natural Science Foundation of Fujian Province (No. 2018J01668)

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The geochemical cycle of heavy metal ion driven by microbes is widespread in nature. Previous studies are focused on the removal efficiency in the treatment of Cd in the bioelectrochemical systems; however, little is reported regarding the reduction mechanism of Cd on the electrode surface in the neutral physiological environment. In this work, we investigated the microbiological influence of Shewanella oneidensis MR-1 wild type and its mutant △omcA-△mtrc for Cd electrodeposition on a glassy carbon electrode (GCE) surface by using cyclic voltammetric (CV) and chronoamperometric methods. The CVs and I-t curves were carried out in a three-electrode system in the present of MR-1 cells (the value of optical density at 600 nm was 0.5) under nitrogen atmosphere. Much results were found in the present of MR-1 wild type:(1) the reducing peak potentials for Cd electrodeposition obviously negative shifted from CVs; (2) when the scan rate was comparatively slow (20 mV·s^-1 vs. saturated calomel electrode), the Cd electrodeposition process contained two steps in the second scan in CVs which were Cd(Ⅱ)-Cd(Ⅰ)-Cd; (3) the average diffusion coefficient of Cd(Ⅱ) from bulk solution to GCE surface (0.93×10^-6 cm·s^-1), calculated from I-t curves, was slightly slower than that without MR-1 wild type (1.1×10^-6 cm·s^-1); (4) the progressive nucleation mechanism for Cd electrodeposition changed into an instantaneous three-dimensional nucleation by compared with their actual nucleation curves. Once the Cd electrodeposition process was performed in the solution with △omcA-△mtrc mutant, the diffusion of Cd(Ⅱ) from bulk solution to GCE surface (the average diffusion coefficient was 0.84×10^-6 cm·s^-1) changed much slower than before; nonetheless, the Cd electrodeposition was also consistent with the instantaneous three-dimensional nucleation. On the other hand, inhomogeneous Cd particles were observed on GCE surfaces at different stepping potentials from scanning electron microscopy (SEM) images. In contrast, the homogeneous Cd particles were found in the present of MR-1 wild type and △omcA-△mtrc mutant when the reduction potentials were higher than -0.9 V. These SEM results regarding the surface morphology of electrodeposited Cd particles also well agreed with three-dimensional nucleation mechanisms.
- Shewanella oneidensis MR-1,
- electrodeposition,
- Cd,
- nucleation mechanism
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