Tourmaline guiding the electric field and dechlorination pathway of 2,3-dichlorophenol by Desulfitobacterium hafniense.

Autor: Lu, Yue1,2,3 (AUTHOR) yuelu@hnu.edu.cn, Liang, Fangyi1,2,3 (AUTHOR), Qin, Fanzhi1,2 (AUTHOR), Zhong, Linrui1,2,3 (AUTHOR), Jiang, Jianhong1,4,5 (AUTHOR), Liu, Qi1,2 (AUTHOR), Zhang, Shoujuan1,2,3 (AUTHOR), Yan, Ming1,2 (AUTHOR), Fan, Changzheng1,2 (AUTHOR), Dong, Haoran1,2 (AUTHOR)
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Zdroj: Journal of Environmental Sciences (Elsevier). Jan2024, Vol. 135, p262-273. 12p.
Abstrakt: • Tourmaline enhanced the reductive dechlorination efficiency of Desulfitobacterium hafniense. • Tourmaline was able to guide the dechlorination pathway of chlorophenols. • The role of electric field in the process of reductive dechlorination was explored. • Tourmaline had good application prospects in the field of environmental remediation. The dehalogenation of organohalides has been a research hotspot in bioremediation field; however, the influence of tourmaline, a natural ore that can generate spontaneous electric field, on organohalide-respiring bacteria (OHRB) and their dechlorination process is not well known. In this study, the effect and mechanism of tourmaline on the reductive dechlorination of 2,3-dichlorophenol (2,3-DCP) by Desulfitobacterium hafniense DCB-2T were explored. The characterization results confirmed that tourmaline had good stability and the optimal dosage of tourmaline was 2.5 g/L, which shortened the total time required for dechlorination reaction to 72 hr. Besides, tourmaline amendment also increased the proportion of 2-chlorophenol (2-CP) from 18% to 30% of end products, while that of 3-CP decreased correspondingly. The theoretical calculations showed that the bond charge of the ortho -substituted chlorine declined from -0.179 to -0.067, and that of meta -substituted chlorine increased from -0.111 to -0.129, which indicated that the spontaneous electric field of tourmaline affected the charge distribution of 2,3-DCP and was more conducive to the generation of 2-CP. Overall, tourmaline with the spontaneous electric field affected the reductive dechlorination pathway of Desulfitobacterium ,and the tourmaline-OHRB combining system might serve as a novel strategy for the bioremediation of environments polluted with chlorinated phenols. [Display omitted] [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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