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学者姓名：刘宇晖
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Abstract ：
Nitric acid (HNO3) as a vital chemical is widely used in energy and environmental fields. However, its conventional production relies on ammonia synthesis, resulting in high energy consumption and environmental concerns. Here, we report a simple, efficient, and green conversion of N2 to HNO3 by contact electrocatalysis (CEC) under ambient conditions. Utilizing the electrification of poly(tetrafluoroethylene) (PTFE) particles with water under ultrasound, we demonstrate how this interaction promotes the activation of N2. Our results showed that the average yield of HNO3 can reach 40.73 +/- 1.80 mu M h-1 in air gas atmosphere. We utilized electron spin resonance and the fluorescence spectrum to confirm the evolution of hydroxyl radicals (OH). High-resolution mass spectrometry combined with isotope experiments provides strong evidence that water-PTFE can produce a contact electric effect through ultrasonic treatment, directly oxidize water or reduce O2 to produce OH, and oxidize N2 to produce HNO3 under anaerobic or aerobic conditions. This work not only provides a green and efficient method for direct N2 fixation into HNO3 but also stimulates further exploration of CEC-driven chemical processes, particularly highlighting its potential for industrial application, and attempts to explain some of the N2 fixation phenomena in the environment.
Keyword ：
contact electrocatalysis (CEC) contact electrocatalysis (CEC) hydroxyl radicals hydroxyl radicals nitric acid nitric acid nitrogen nitrogen poly(tetrafluoroethylene)(PTFE) poly(tetrafluoroethylene)(PTFE) water oxidation water oxidation
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| GB/T 7714 | Huang, Shaofu , Liu, Yuhui , Ren, Lincong et al. Direct Conversion of N2 to Nitric Acid via Contact Electrocatalysis [J]. | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2025 , 13 (27) : 10486-10494 . |
| MLA | Huang, Shaofu et al. "Direct Conversion of N2 to Nitric Acid via Contact Electrocatalysis" . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING 13 . 27 (2025) : 10486-10494 . |
| APA | Huang, Shaofu , Liu, Yuhui , Ren, Lincong , Huang, Lingyan , Tang, Jiahuan , Yu, Zhen et al. Direct Conversion of N2 to Nitric Acid via Contact Electrocatalysis . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2025 , 13 (27) , 10486-10494 . |
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Abstract ：
Zinc (Zn) isotope geochemistry is a powerful tool for tracing Zn biogeochemical cycling in terrestrial ecosystems. This review comprehensively synthesizes Zn isotope signatures and fractionation mechanisms in atmospheric, soil, aquatic, and plant systems, integrating laboratory experiments and field observations. Laboratory studies have identified key drivers of Zn isotope fractionation, including mineral dissolution-precipitation, adsorption onto mineral surfaces, and organic complexation. Field studies show that interactions, particularly the competition between OM and (hydr)oxides, dominate Zn isotope compositions, with OM-rich soils exhibiting relatively lower delta 66Zn values. Anthropogenic activities significantly influence Zn isotope signatures. Agricultural practices exert an insignificant effect on natural delta 66Zn; traffic emissions exhibit slightly light Zn isotope compositions; urban emissions (e.g., electroplating) and industrial processes (e.g., smelting) are the predominant Zn sources, inducing significant Zn isotopic offsets. Plants preferentially uptake 64Zn, while selective retention of 66Zn in root cell walls may cover the uptake preference. Furthermore, translocation within plants occurs through low-affinity (diffusion-driven) and high-affinity (carrier protein-mediated) pathways, favoring 64Zn and 66Zn, respectively. These mechanisms collectively govern Zn isotopic variations. Despite progress, key knowledge gaps remain, particularly in quantifying intracellular isotope fractionation and disentangling multi-process interactions under natural conditions. Future research should integrate multi-isotope tracers (e.g., Zn-Cd-Pb), spatially resolved microanalytical techniques, and predictive modeling to refine pollution tracing and advance mechanistic un-derstanding of Zn cycling. By bridging laboratory insights with ecosystem-scale observations, this review highlights the potential of Zn isotopes to address environmental challenges, from tracing metal pollution to guiding sustainable resource management in the Anthropocene.
Keyword ：
Anthropogenic activities Anthropogenic activities Mechanism Mechanism Plant-soil-water system Plant-soil-water system Zinc cycle Zinc cycle Zinc isotope fractionation Zinc isotope fractionation
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| GB/T 7714 | Xia, Zihan , Liu, Chengshuai , Gao, Ting et al. The biogeochemical cycling of zinc in terrestrial ecosystems: Insights from zinc isotopes [J]. | JOURNAL OF HAZARDOUS MATERIALS , 2025 , 499 . |
| MLA | Xia, Zihan et al. "The biogeochemical cycling of zinc in terrestrial ecosystems: Insights from zinc isotopes" . | JOURNAL OF HAZARDOUS MATERIALS 499 (2025) . |
| APA | Xia, Zihan , Liu, Chengshuai , Gao, Ting , Qi, Meng , Wang, Zhengrong , Wu, Qiqi et al. The biogeochemical cycling of zinc in terrestrial ecosystems: Insights from zinc isotopes . | JOURNAL OF HAZARDOUS MATERIALS , 2025 , 499 . |
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Abandoned industrial sites present significant environmental challenges due to toxic metal(loid) (TM) pollution, but comprehensive understanding of their migration pathways within the slag-soil-groundwater continuum remains limited. This study systematically investigated a representative abandoned industrial complex to reveal the following mobility sequence of TMs within the slag-soil-groundwater continuum: Cd > Zn > Pb > As. Water-soluble and exchangeable fractions of Cd and Zn constituted >50 % of their total contents in soil, whereas As occurred predominately in the residual fraction and was fixed within Fe oxides. Mineralogical evidence showed that ZnS and Cd-doped ZnO in the slag were the main source of dissolved Cd and Zn, which were subsequently adsorbed by soil Fe oxides. Zinc isotopic analysis across the different media provided further evidence that Fe oxides played a key role in mediating the migration of TMs from surface soil to groundwater. Furthermore, acidic groundwater significantly affected the geochemical occurrence of TMs within the slag-soil-groundwater continuum, increasing their transport fluxes and ecological risks to the adjacent environment. This study emphasized the critical role of Fe oxides in controlling TM migration and provided valuable insights into the geochemical behaviors of TMs within the slag-soil-groundwater continuum, offering important implications for remediation and sustainable redevelopment strategies for abandoned industrial sites.
Keyword ：
Abandoned industrial site Abandoned industrial site Geochemical occurrence Geochemical occurrence Iron oxide Iron oxide Migration pattern Migration pattern Slag-soil-groundwater continuum Slag-soil-groundwater continuum Toxic metal(loid) Toxic metal(loid)
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| GB/T 7714 | Zhao, Peng , Zhang, Haili , Yang, Xuefeng et al. Mechanisms of toxic metal(loid) migration in the slag-soil-groundwater continuum: Geochemical evidence from an abandoned industrial complex [J]. | JOURNAL OF CLEANER PRODUCTION , 2025 , 523 . |
| MLA | Zhao, Peng et al. "Mechanisms of toxic metal(loid) migration in the slag-soil-groundwater continuum: Geochemical evidence from an abandoned industrial complex" . | JOURNAL OF CLEANER PRODUCTION 523 (2025) . |
| APA | Zhao, Peng , Zhang, Haili , Yang, Xuefeng , Wang, Haiyan , Adnan, Muhammad , Wu, Yunlong et al. Mechanisms of toxic metal(loid) migration in the slag-soil-groundwater continuum: Geochemical evidence from an abandoned industrial complex . | JOURNAL OF CLEANER PRODUCTION , 2025 , 523 . |
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