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

作　　者：Yue Lu Fangyi Liang Fanzhi Qin Linrui Zhong Jianhong Jiang Qi Liu Shoujuan Zhang Ming Yan Changzheng Fan Haoran Dong 

机构地区：[1]College of Environmental Science and Engineering,Hunan University,Changsha 410082,China [2]Shenzhen Research Institute,Hunan Univerisy,Shenzhen 510082,China [3]Key Laboratory of Environment Biology and Pollution Control,Hunan University,Ministry of Education,Changsha 410082,China [4]China Machinery International Engineering Design&Research Institute Co.,Ltd.,Changsha 410007,China [5]Hunan Engineering Research Center for Water Treatment Process&Equipment,Changsha 410007,China

出　　处：《Journal of Environmental Sciences》2024年第1期262-273,共12页环境科学学报（英文版）

基　　金：supported by the Natural Science Foundation of Hunan Province of China (No.2020JJ4194);the Shenzhen Science and Technology Program (No.JCYJ20220530160412027);the Changsha Science and Technology Program (No.kq2004022);the Science and Technology Innovation Program of Hunan Province (No.2022RC1026);the Project of the National Key Research and Development Program of China (No.2021YFC1910400);the Technical Innovation Leading Plan Project for Hunan High-tech Industry (Nos.2020SK2042 and2022GK4062);the Key R&D Project of Hunan Province of China (No.2022SK2067)。

摘　　要：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-2Twere 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 orthosubstituted 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.

关 键 词：Reductive dechlorination Desulfitobacterium hafniense TOURMALINE Electric field 2 3-dichlorophenol 

分 类 号：X703[环境科学与工程—环境工程]