通讯机构：
[Yi Liu; Zhiqiang Zhou] G;Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning, 530001, PR China<&wdkj&>Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning, 530001, PR China<&wdkj&>School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, PR China
关键词：
PCN-224;Sulfite detection;Fluorescence enhancement;Limit of detection
摘要：
Development of a facile and effective strategy for highly sensitive detection of sulfite (SO32-) in food is of great significance to human health. Herein, fluorescent porphyrin-based MOFs (PCN-224) was synthesized and further developed as an enhanced fluorescence sensor for SO32- detection. The fluorescence peak of PCN-224 locates at 664 nm. In the presence of SO32-, the acid-base reaction between H2PO4- and SO32- promotes the generation of PO43-, thus forming Zr-OP bonds and enhancing the fluorescence intensity of PCN-224 at 664 nm. Therefore, H2PO4- is used as an auxiliary agent to construct the sensing system PCN-224/H2PO4-. The fluorescence enhancement of PCN-224/H2PO4- shows a good linear relationship in the range of 0.01-18 mu M and the limit of detection is as low as 3.8 nM. In addition, the constructed PCN-224/H2PO4- sensor system can be successfully used for SO32- detection in the granulated sugar with a recovery ranging from 100.17% to 106.25%, demonstrating the feasibility of PCN-224/H2PO4- nanosensor for SO32- detection in real sample analysis.
摘要：
Polyimide (PI) is a high-performance engineering plastic used as a bearing material. A superlubricity system using Si3N4/PI as the friction pair and nematic liquid crystals (LCs) as the lubricant was designed. The superlubricity performance was studied by simulating the start-stop condition of the machine, and it was found that the superlubricity system had good reproducibility and stability. In the superlubricity system, friction aligned with the PI molecules, and this alignment was less relevant compared to which substance was rubbing on the PI. Oriented PI molecules induced LC molecule alignment when the pretilt angle was very small, and the LC molecules were almost parallel to the PI molecules due to the one-dimensional ordered arrangement of LC molecules and low viscosity, which is conducive to the occurrence of the superlubricity phenomenon.
摘要：
Sodium alginate (SA)-based implantable scaffolds with slow-release drugs have become increasingly important in the fields of biomedical and tissue engineering. However, high-molecular-weight SA is difficult to remove from the body due to the lack of SA-degrading enzymes. The very slow degradation properties of SA-based scaffolds limit their applications. Herein, we designed a series of biodegradable oxidized SA (OSA)-based scaffolds through amide bonds, imine bonds and hydrogen bridges between OSA and silk fibroin (SF). SF/OSA-0.4 with a blend ratio of 4/1 was chosen for further polydopamine (PDA) surface modification studies through the optimization of those parameters such as different OSA oxidation degrees, and blend ratios. PDA modified SF/OSA-0.4 (Dopa/SF/OSA-0.4) showed the excellent stability, better stretchable properties, a uniform interconnective porous structure, high thermal stability, a low hemolysis ratio and cytotoxicity. In vitro degradation experiments showed that the degradation rate of SF/OSA was significantly higher than that of SF/SA, but the degradation slowed again after PDA modification. Interestingly, the degradation of Dopa/SF/OSA-0.4 in vivo was significantly faster than that in vitro. Dopa/SF/OSA-0.4 was also more conducive to new tissue growth and collagen bundle formation. Moreover, Dopa/SF/OSA-0.4 improved the absorbability of RhB (model drug) and reduced the sudden release of RhB during the sustained release.
作者：
Li, Kaining;Zhou, Weichuang;Li, Xiaofang*;Li, Qin;Carabineiro, Sonia A. C.;...
期刊：
Journal of Hazardous Materials,2023年442:130040 ISSN：0304-3894
通讯作者：
Li, Xiaofang;Lv, Kangle
作者机构：
[Li, Kaining; Li, Xiaofang] Wuhan Polytech Univ, Coll Chem & Environm Engn, Wuhan 430023, Peoples R China.;[Li, Kaining; Li, Qin; Zhang, Sushu; Zhou, Weichuang; Lv, Kangle] South Cent Minzu Univ, Coll Resources & Environm, Key Lab Resources Convers & Pollut Control, State Ethn Affairs Commiss, Wuhan 430074, Peoples R China.;[Carabineiro, Sonia A. C.] Univ NOVA Lisboa, NOVA Sch Sci & Technol, Dept Chem, LAQV REQUIMTE, P-2829516 Caparica, Portugal.;[Fan, Jiajie] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China.
通讯机构：
[Lv, Kangle] K;[Li, Xiaofang] C;College of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China. Electronic address:;Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission, College of Resources and Environment, South-Central Minzu University, Wuhan 430074, PR China. Electronic address:
摘要：
Photo-oxidation with semiconductor photocatalysts provides a sustainable and green solution for NO(x) elimination. Nevertheless, the utilization of traditional photocatalysts in efficient and safe photocatalytic NO(x) removal is still a challenge due to the slow charge kinetic process and insufficient optical absorption. In this paper, we report a novel porous g-C(3)N(4) nanosheet photocatalyst modified with cyano defects and CaCO(3) (xCa-CN). The best performing sample (0.5Ca-CN) exhibits an enhanced photo-oxidation NO removal rate (51.18%) under visible light irradiation, largely surpassing the value of pristine g-C(3)N(4) nanosheets (34.05%). Such an enhancement is mainly derived from an extended visible-light response, improved electron excitation and transfer, which are associated with the synergy of cyano defects and CaCO(3), as evidenced by a series of spectroscopic analyses. More importantly, in-situ DRIFTS and density functional theory (DFT) results suggest that the introduction of cyano defects and CaCO(3) enables control over NO adsorption and activation processes, making it possible to implement a preference pathway (NO → NO(+) → NO(3)¯) and reduce the emission of toxic intermediate NO(2). This work demonstrates the potential of integrating defect engineering and insulator modification to design highlyefficient g-C(3)N(4)-based photocatalysts for air purification.
通讯机构：
[He, GY; Li, Y ] H;[Xiong, ZY ] I;Huazhong Univ Sci & Technol, Coll Life Sci & Technol, Key Lab Mol Biophys, Genet Engn Int Cooperat Base,ChineseMinist Sci & T, Wuhan, Peoples R China.;Inner Mongolia Univ, Sch Life Sci, Lab Forage & Endem Crop Biol, Minist Educ, Hohhot, Peoples R China.
关键词：
Sorghum;Drought stress;Salt and alkaline stress;Temperature stress;Omics analyses;Gene Expression Regulation
摘要：
Sorghum (Sorghum bicolor L. Moench), a monocot C4 crop, is an important staple crop for many countries in arid and semi-arid regions worldwide. Because sorghum has outstanding tolerance and adaptability to a variety of abiotic stresses, including drought, salt, and alkaline, and heavy metal stressors, it is valuable research material for better understanding the molecular mechanisms of stress tolerance in crops and for mining new genes for their genetic improvement of abiotic stress tolerance. Here, we compile recent progress achieved using physiological, transcriptome, proteome, and metabolome approaches; discuss the similarities and differences in how sorghum responds to differing stresses; and summarize the candidate genes involved in the process of responding to and regulating abiotic stresses. More importantly, we exemplify the differences between combined stresses and a single stress, emphasizing the necessity to strengthen future studies regarding the molecular responses and mechanisms of combined abiotic stresses, which has greater practical significance for food security. Our review lays a foundation for future functional studies of stress-tolerance-related genes and provides new insights into the molecular breeding of stress-tolerant sorghum genotypes, as well as listing a catalog of candidate genes for improving the stress tolerance for other key monocot crops, such as maize, rice, and sugarcane.
摘要：
Cellular redox homeostasis is highly dependent on endogenous antioxidant systems, including superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx). The nanozymes mimicking the catalytic activities of natural antioxidant systems serve as potential candidates for the therapy of reactive oxygen species (ROS)-related diseases. However, previously reported metal-containing nanozymes possessed unsatisfactory catalytic activity and inevitable peroxidase activity, limiting their translational applications. Therefore, inspired by the superior ROS scavenging activities of natural polyphenols and metal-free carbon dots (CDs) with ultra-small size, phenol-functionalized CDs that mimic endogenous antioxidant system have been fabricated. The SOD activity was determined at an extremely high level (18187 U/mg), which was substantially comparable to natural SOD. Notably, this study reveals for the first time that CDs, as selenium-free nanomaterials, show robust GPx activity in vitro. The theory calculation suggests that the bond dissociation of phenols on CDs is considerably lower than selenocysteine of natural GPx, which facilitates the formation of peroxide intermediate to initiate GPx-like reactions. Furthermore, the kidney-targeting and intracellular antioxidant mimicking properties contribute to the effective alleviating cisplatin-induced acute kidney injury via suppressing oxidative stress-mediated ferroptosis in vivo. These results provide an effective polyphenol-functionalized strategy for synthesizing metal-free multifunctional antioxidant nanozyme to treat ROS-related diseases.
摘要：
Outdoor air pollution causes millions of premature deaths annually worldwide. Sulfate is a major component of particulate pollution. Winter sulfate observations in China show both high concentrations and an accumulation mode with a modal size >1 μm. However, we find that this observed size distribution cannot be simulated using classical gaseous and aqueous phase formation (CSF) or proposed aerosol-processing formation (APF) mechanisms. Specifically, the CSF simulation underestimates sulfate concentrations by 76% over megacities in China and predicts particle size distributions with a modal size of ∼0.35 μm, significantly smaller than observations. Although incorporating the APF mechanism in the atmospheric chemical model notably improves sulfate concentration simulation with reasonable parameters, the simulated sulfate particle size distribution remains similar to that using the CSF mechanism. We further conduct theoretical analyses and show that particles with diameters <0.3 μm grow rapidly (2–3 s) to 1 μm through the condensation of sulfuric acid in fresh high-temperature exhaust plumes, referred to as in-source formation (ISF). An ISF sulfate source equivalent to 15% of sulfur emissions from fossil fuel combustion largely explains both observed size distributions and mass concentrations of sulfate particles. The findings imply that ISF is a major source of wintertime micron-sized sulfate in China and underscore the importance of considering the size distribution of aerosols for accurately assessing the impacts of inorganic aerosols on radiative forcing and human health.
The in-source formation mechanism explains not only high sulfate mass concentrations but more importantly the formation of large micron-sized sulfate particles observed in winter in China.
摘要：
Natural pigskin was subjected to cryogrinding before extraction, and effects of the approach on extraction rate, structure, and properties of collagen were prospected systematically. It was found that the extraction rate multiplied gradually from 22% to 40% with an extended grinding duration from 0 to 20 min. Compared with natural collagen, the ground one soared by about 80% concerning the net yield. Electrophoresis revealed the stereo structures of the extracted collagen were not destroyed when ground, while a small amount of it degraded accordingly, whose conclusion was further corroborated by circular dichroism (CD) and infrared spectrometry. Results from contact angle (CA) test clarified that the hydrophilicity of collagen enhanced with prolonged grinding. Moreover, analysis of fibrillogenesis behavior verified that, after grinding, the assembly rate for collagen in the turbidity assay dented with a lengthened equilibrium time; finer fibril network with larger pore size and weakened elasticity was later observed. Methyl thiazolyl tetrazolium (MTT) analysis manifested that ground collagen was more conducive to cell proliferation. This polymer processing approach not only provides us with a facile approach to manipulate capacities of collagen but also sheds light on other potential substances beneath the same principle.
摘要：
A novel CuO-Fe(3)O(4) encapsulated in the carbon framework with abundant oxygen vacancies (CuO-Fe(3)O(4)@C) was successfully prepared by thermal conversion of Cu(OAc)(2)/Fe-metal organic framework. The as-prepared catalyst exhibited excellent peroxymonosulfate (PMS) activation performance, good recyclability and fast magnetic separation. Under optimal conditions, the added BPA (60mg/L) could be completely removed by CuO-Fe(3)O(4)@C/PMS system within 15min with the degradation rate constant (k) of 0.32 min(-1), being 10.3 and 246.2 times that in CuO/PMS (0.031min(-1)) and Fe(3)O(4)/PMS (0.0013 min(-1)) system. A deep mineralization rate of BPA (＞80%) was achieved within 60min. The results demonstrated the synergistic effect of bimetallic clusters, oxygen vacancies and carbon framework was a key benefit for the exposure of more active sites, the electron donor capacity and the mass transfer of substrates, thereby promoting the decomposition of BPA. Capture experiments and EPR indicated that (1)O(2) was the predominant reactive oxygen species (ROSs). The degradation routes of BPA and the activation mechanism of PMS were proposed. This study offers an opportunity to develop promising MOFs-derived hybrid catalysts with tailored structures and properties for the practical application of SR-AOPs.
通讯机构：
[Haibo Wang; Lang He] S;School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, People’s Republic of China<&wdkj&>School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, People’s Republic of China
摘要：
Take bovine tendon type-I collagen as the raw material, we pretreated it by freezing and then grinding the macromolecule at a low temperature (4–10°C). Effects of the grinding process on the molecular structure, water solubility, fibrillogenesis behavior in vitro and biological activity of collagen were systematically prospected. Sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS–PAGE) results revealed that the collagen had typical structural characteristics of type-I collagen; moreover, grinding treatment gave rise to partially degraded collagen molecules which took on continuous bands with lower molecular weights different from α1 and α2. More strikingly, the degradation degree positively corresponded to the grinding duration. Circular dichroism (CD) analysis manifested that with extended grinding, intensities of both the positive and negative peaks for collagen samples shrunk. Interestingly, grinding also contributed to improved water solubility of collagen. The water solubility of the sample ground for 20min (COL20) was 1.91mg/mL, which is about 6 times higher than that of the natural collagen sample (0.28mg/mL). Amid the study concerning the fibrillogenesis behavior, turbidity and rheological data collaboratively demonstrated that with prolonged grinding time, the assembly rate and degree of the sample plunged. Assembled gel from the ground collagen with finer fibrils was also observed in scanning electron microscope (SEM), which further embraced the conclusion aforementioned in fibrillogenesis kinetics. Cell experiments corroborated that the grinding process can be harnessed to manipulate the cell proliferation promoting ability of collagen. Simultaneously, further dissection of COL20 with the best biological activity clarified that the water-soluble part and water-insoluble part of COL20 had distinct aptitudes as to promoting cell proliferation as well as inhibiting the growth of liver cancer cells.
Cryogrinding treatment, which may give rise to physical and chemical changes of substances out of its prominent mechanical force on specimens, was utilized to modulate performances of collagen, including its water solubility, gel properties and biological capacities. The resultant collagen powder with improved water solubility and bioactivity is expected to expedite its actual processing and applications.
关键词：
catalyst;energy conservation;environmental engineering;pyrolysis;syngas;UN SDG 7: Affordable and clean energy
摘要：
It is crucial to develop an efficient catalyst for catalytic co-pyrolysis. In this paper, the catalytic co-pyrolysis of cattle manure and rice husk over a catalyst loaded with cobalt (Co) using potassium hydroxide-activated biochar as the support was conducted in a two-stage fixed-bed reactor. The results showed that the cobalt/potassium rice husk char (KRHC) catalyst displayed a good catalytic pyrolysis process with a large specific surface area and a developed pore structure. Loading with cobalt not only improved the quality of syngas but also increased syngas yield. Hydrogen content increased from 4.55 to 13.68% and carbon monoxide content increased from 19.78 to 32.25%, whereas carbon dioxide content decreased from 7.32 to 5.3% and methane content decreased from 8.01 to 6.07%. Syngas yield increased from 3.68 to 4.58 N m(3)/kg. The catalyst promoted the breaking of C-C and C-O bonds in tar, increased the content of phenols, ketones and aldehydes, and reduced the content of oxygen in the syngas. The catalysts also maintained good performance after five catalytic cycles, with hydrogen and carbon monoxide contents of approximately 10 and 27.5%, respectively.
摘要：
Acetyl ferulic 7-hydroxyisoflavone ester (AHE) was synthesized and its antioxidant capacity in vitro was evaluated by free radical scavenging assay and thermo-oxidative stability analysis of fish oil in this study. The formation of primary and secondary oxidation products can be effectively inhibited by AHE, tert-butylhydroxyquinone (TBHQ), ferulic acid and 7-hydroxyisoflavone. The intensity of UV-Vis absorption spectra increased significantly, whereas the intensity of fluorescence spectra decreased obviously with the deepening of oxidation degree of fish oil. AHE significantly alleviated the degradation of unsaturated fatty acids in fish oil. The results demonstrated that AHE was more effective than TBHQ, ferulic acid and 7-hydroxyisoflavone in retarding the oxidative degradation of fish oil during high temperature storage (80 & DEG;C). Moreover, the formation of oxidation products in fish oil followed a first-order kinetic model, and AHE effectively reduced reaction rate constant and delayed secondary lipid oxidation process. As a result, AHE is an effective antioxidant that can stabilise fish oil. Synthesis of AHE and its effect on oxidation stability of fish oil at high temperature..image
摘要：
Water electrolysis is the most fascinating procedure for producing pure hydrogen owing to its flexibility and convenience. Platinum (Pt) is the most effective electrocatalyst for the hydrogen evolution reaction (HER) but its high price and scarcity have greatly restricted its commercial application. Therefore, it is necessary to greatly increase the mass activity (MA) of Pt to meet practical applications. In the present study, an oxidized Pt atomic cluster-supported Au electrode (PtAC-O-Au) with an ultra-low loading was prepared by high vacuum magnetron sputtering combined with electrochemical anodic oxidation. The (PtAC-O-Au)-1 electrode has a very high mass activity (MA), reaching 49.2 A mgPt-1 at an overpotential of 50 mV, which is 41 times that of the 20 wt% Pt/C electrode and 20 times that of the 0.5 wt% Pt/C electrode. Even at such a low load, the (PtAC-O-Au)-1 electrode has excellent apparent activity and only needs an overpotential of 41 mV@10 mA cm-2, which is close to that of the 20 wt% Pt/C electrode (37 mV@10 mA cm-2). Moreover, the (PtAC-O-Au)-1 electrode has an ultra-high specific activity (SA). The SA of (PtAC-O-Au)-1 is 12-18 times higher than that of the 0.5 wt% Pt/C electrode and 36-56 times higher than commercial Pt/C electrodes. More importantly, it was confirmed by the electrochemical analysis method (cyclic voltammetry and CO adsorption-stripping) and X-ray photoelectron spectroscopy (XPS) that the active site is the oxidized platinum (Pt-O-Au) on the surface of the electrode. Density functional theory (DFT) calculations have also elucidated that the absolute value of Delta GH*(Pt) of PtAC-O-Au is close to that of Pt(111), indicating that its outstanding HER activity originates from its optimal Delta GH*(Pt) value. The oxidized Pt atomic cluster-supported Au electrode (PtAC-O-Au) with ultra-low loading exhibits a very high mass activity, and the active site is the oxidized platinum (Pt-O).
关键词：
Ferrosilicon from carbide slag;Iron-based catalyst;Decolorization;Advanced oxidation;Peroxymonosulfate
摘要：
The model of efficient, clean, and cheap collaborative governance has received considerable attention in the treatment of pollution such as wastewater and solid waste. The “waste control by waste” strategy is proposed and put into practice in this work, that is, the ferrosilicon from waste carbide slag is utilized for treating dyes wastewater via the advanced oxidation process (AOP) of ferrosilicon/PMS/light. The main component of ferrosilicon is FeSi and Fe5Si3, which are riched in Fe element and suitable for inducing the AOP reaction. When the ferrosilicon is used in the AOP system, 20 mg L−1 MB can be completely decolorized within 45 min. The excellent performance of the ferrosilicon/PMS/light system is also observed in various wastewater conditions such as solution pH (3–9) and dye types (MB, MO, MG, and CR), which is superior to common PMS/light and other reported system. In addition, the ferrosilicon catalyst can keep the MB removal at nearly 100% in five cycles, and the proportion of its leached iron is always less than 1%, which effectively solves the performance degradation and leaching loss of commonly used zero-valent iron (ZVI) catalyst. In the ferrosilicon/PMS/light system, the SO4●ˉ and 1O2 radicals act as the main active species and their production is due to the redox of iron elements and the self-decomposition of PMS, respectively. Overall, this research progress provides a valuable reference for clean and cheap environmental governance.
通讯机构：
[Chai, B ] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.
关键词：
PS-AOPs;NCCA;CoAl-LDH catalyst;Non-radical and radical;Degradation pathways
摘要：
Nitrogen self-doped chitosan carbon aerogel (NCCA) integrating with CoAl layered double hydroxide (CoAl-LDH) was successfully fabricated and utilized for the ultra-efficient activation of peroxymonosulfate (PMS) toward sulfamethoxazole (SMX) degradation. And the NCCA/CoAl-LDH-2 catalyst possessed the highest catalytic activity with 97.5% of SMX degradation efficiency in 5 min and 74.8% of total organic carbon (TOC) removal efficiency in 30 min, may being on account of the synergistic interaction between NCCA and CoAl-LDH. Additionally, the NCCA/CoAl-LDH-2 catalyst not only had good reusability and stability, but also could realize continuous degradation of SMX solutions via a fixed-bed reactor. Furthermore, the results of quenching tests, electrochemical measurements as well as electron paramagnetic resonance (EPR) analysis demonstrated that both non-radical and radical processes participated in the SMX degradation, in which the latter played a predominant role. X-ray photoelectron spectroscopy (XPS) corroborated that the main active sites were the C--O groups and graphitic N of NCCA, and the Co3+/Co2+ redox cycle of CoAl-LDH. High-performance liquid chromatography-mass spectrometry (HPLC-MS) analysis and density functional theory (DFT) calculation containing the laplacian bond order (LBO) and Fukui index were carried out to deeply explore the reasonable SMX degradation pathways. This current study provided a theoretical basis to design an efficient PMS activation system toward continuous antibiotics degradation.
通讯机构：
[Feng-Lei Jiang] S;Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, P. R. China
摘要：
Colloidal quantum dots (QDs) are a class of representative fluorescent nanomaterials with tunable, bright, and sharp fluorescent emission, with promising biomedical applications. However, their effects on biological systems are not fully elucidated. In this work, we investigated the interactions between QDs with different surface ligands and different particle sizes and α-chymotrypsin (ChT) from the thermodynamic and kinetic perspectives. Enzymatic activity experiments demonstrated that the catalytic activity of ChT was strongly inhibited by QDs coated with dihydrolipoic acid (DHLA-QDs) with noncompetitive inhibitions, whereas the QDs coated with glutathione (GSH-QDs) had weak effects. Furthermore, kinetics studies showed that different particle sizes of DHLA-QDs all had high suppressive effects on the catalytic activity of ChT. It was found that DHLA-QDs with larger particle sizes had stronger inhibition effects because more ChT molecules were bound onto the surface of QDs. This work highlights the importance of hydrophobic ligands and particle sizes of QDs, which should be considered as the primary influencing factors in the assessment of biosafety. Meanwhile, the results herein can also inspire the design of nano inhibitors.
通讯机构：
[Falong Jia; Lizhi Zhang] I;Institute of Environmental & Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, China
关键词：
Ammonia nitrogen removal;Single-atom iron;Non-noble metal catalyst;Aquaculture wastewater
摘要：
Ammonia nitrogen (NH4+-N) is a ubiquitous environmental pollutant, especially in offshore aquaculture systems. Electrochemical oxidation is very promising to remove NH4+-N, but suffers from the use of precious metals anodes. In this work, a robust and cheap electrocatalyst, iron single-atoms distributed in nitrogen-doped carbon (Fe-SAs/N-C), was developed for electrochemical removal of NH4+-N from in wastewater containing chloride. The Fe-SAs/N-C catalyst exhibited superior activity than that of iron nanoparticles loaded carbon (Fe-NPs/N-C), unmodified carbon and conventional Ti/IrO2-TiO2-RuO2 electrodes. And high removal efficiency (> 99%) could be achieved as well as high N-2 selectivity (99.5%) at low current density. Further experiments and density functional theory (DFT) calculations demonstrated the indispensable role of single-atom iron in the promoted generation of chloride derived species for efficient removal of NH4+-N. This study provides promising inexpensive catalysts for NH4+-N removal in aquaculture wastewater. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
