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Comammox activity dominates nitrification process in the sediments of plateau wetland
Yuan, Dongdan; Zheng, Lei; Tan, Qiuyang; Wang, Xue; Xing, Yuzi; Wang, Huipeng; Wang, Shanyun; Zhu, Guibing
2021-11-01
Source PublicationWATER RESEARCH
ISSN0926-3373
Volume297Pages:-
AbstractThe high-efficiency photocatalytic debromination of hexabromocyclododecane (HBCD) as new POPs and discovery of involved mechanisms remain a challenge. Herein, challenging Pd-anchored hollow-rod-like-g-C3N4 (Pd/HR-g-C3N4) was constructed as visible-light-driven photocatalyst. Complete destruction of (+/-)-alpha, (+/-)-beta and (+/-)-gamma-HBCD with 92.6 % bromine-removal was achieved at 60 min in optimal system of anaerobic methanol-water (70:30) mixture with 0.5 % Pd/HR-g-C3N4, being superior to most studied HBCD catalytic systems. The higher photocatalytic reduction performance is contributed to enhanced photoexcited-carriers separation and more negative conduction band arising from distinctive 1D-cavity of HR-g-C3N4, and surface-atomically dispersed Pd. A never-reported degradation pathway in which hydrodebromination and addition ring-opening synergistically occur is proposed according to identified products of ten saturated chain alkanes, C12H19Br5 and C12H19Br7. Ulteriorly, hydride-transfer resulted in rapid hydrodebromination of HBCD over Pd/HR-g-C3N4, where H chiefly derives from methanol instead of water although they synergistically promoted e(-) utilization. This provided a valuable sight into the cost-effective pollution-removal of HBCD.
Department中国科学院饮用水科学与技术重点实验室
KeywordHexabromocyclododecane (HBCD) Visible-light photocatalysis Pd-single-atoms Hollow-rod-like-g-C3N4 Debromination
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46908
Collection中国科学院饮用水科学与技术重点实验室
Affiliation1.Beijing Normal Univ, Coll Water Sci, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Dongdan,Zheng, Lei,Tan, Qiuyang,et al. Comammox activity dominates nitrification process in the sediments of plateau wetland[J]. WATER RESEARCH,2021,297:-.
APA Yuan, Dongdan.,Zheng, Lei.,Tan, Qiuyang.,Wang, Xue.,Xing, Yuzi.,...&Zhu, Guibing.(2021).Comammox activity dominates nitrification process in the sediments of plateau wetland.WATER RESEARCH,297,-.
MLA Yuan, Dongdan,et al."Comammox activity dominates nitrification process in the sediments of plateau wetland".WATER RESEARCH 297(2021):-.
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