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Efficient and highly selective photocatalytic reduction of Cr(Ⅵ) by an active two-dimensional covalent organic framework

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Progress in Natural Science:Materials International 2024年第5期34卷 933-941页

作者： Yuxuan Bai Yunzi Wang Junyu Chen Keda Zhu Jianjun Wang MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University

In this paper, a two-dimensional covalent organic framework material（named HDU-27） with thiazole structure and π-π conjugation has been successfully synthesized using the ligands tri acetaldehyde-based methoxyphenyl and benzo [1,2-d:4,5-d]thiazole-2,6-diamine in an ammonia-formaldehyde condensation reaction and applied to the photocatalytic reduction study of chromium（Cr）. The photocatalytic experiments showed that HDU-27 had an excellent photocatalytic reduction of Cr（VI） with a high Cr（VI） reduction efficiency of 99.5 % at pH = 2 for 60min. In the presence of interfering ions, HDU-27 exhibited excellent selectivity for Cr（VI）. Mechanistic experiments and electron spin resonance characterization identified e-and ·O-2radicals as the main active species in Cr（VI） photocatalytic reduction. In addition, the photocatalytic rate of HDU-27 was significantly accelerated in the Cr（VI）/organic pollutant（RhB, MB, MO） mixed system due to the oxidation of the organic matter and the increase in the separation of photogenerated e--h+. The cycling experiments demonstrated the excellent reduction stability and recyclability of HDU-27 in the photocatalytic reduction of Cr（VI）. HDU-27 is an excellent photocatalyst with potential application for removing organic pollutants and heavy metal ions from contaminated wastewater.

关键词： Covalent organic framework HDU-27 Photocatalysis Chromium reduction

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Machine learning-assisted fluorescence visualization for sequential quantitative detection of aluminum and fluoride ions

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Journal of environmental Sciences 2025年第3期149卷 68-78页

作者： Qiang Zhang Xin Li Long Yu Lingxiao Wang Zhiqing Wen Pengchen Su Zhenli Sun Suhua Wang School of Environmental Science and Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China

The presence of aluminum(Al^(3+))and fluoride(F^(−))ions in the environment can be harmful to ecosystems and human health,highlighting the need for accurate and efficient *** this paper,an innovative approach is presented that leverages the power of machine learning to enhance the accuracy and efficiency of fluorescence-based detection for sequential quantitative analysis of aluminum(Al^(3+))and fluoride(F^(−))ions in aqueous *** proposed method involves the synthesis of sulfur-functionalized carbon dots(C-dots)as fluorescence probes,with fluorescence enhancement upon interaction with Al^(3+)ions,achieving a detection limit of 4.2 nmol/***,in the presence of F^(−)ions,fluorescence is quenched,with a detection limit of 47.6 nmol/*** fingerprints of fluorescence images are extracted using a cross-platform computer vision library in Python,followed by data ***,the fingerprint data is subjected to cluster analysis using the K-means model from machine learning,and the average Silhouette Coefficient indicates excellent model ***,a regression analysis based on the principal component analysis method is employed to achieve more precise quantitative analysis of aluminum and fluoride *** results demonstrate that the developed model excels in terms of accuracy and *** groundbreaking model not only showcases exceptional performance but also addresses the urgent need for effective environmental monitoring and risk assessment,making it a valuable tool for safeguarding our ecosystems and public health.

关键词： Machine learning Aluminum ion detection Fluorine ion detection Fluorescence probe K-means model

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Efficient extraction of uranium(VI)from aqueous solution by Zr/Ce-UiO-66-NH_(2) modified by dual strategies of bimetallization and amination

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Nuclear Science and Techniques 2024年第11期35卷 124-137页

作者： Wen-Hui Song Chen Wang Cheng-De Xie Zhi-Xiong Zhang Jian-Jun Wang MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China

We modified Zr/Ce-UiO-66-NH_(2) using dual bimetallization and amination strategies to efficiently extract uranium from water ***,FTIR,and XPS indicated the successful alteration of material ***,the metal Zr was partially replaced by Ce in Zr-oxygen atom clusters in Zr/Ce-UiO-66-NH_(2).It possessed commendable structural stability in acidic and alkaline *** of whether it was submerged in a 6 M strong acid or in a 0.5M strong base solution,the structural integrity of Zr/Ce-UiO-66-NH_(2) remained *** experiments at pH=6.0 revealed that uranium adsorption by Zr/Ce-UiO-66-NH_(2) reached 376.8 mg g^(−1) and 611.33 mg g^(−1) at 298 K and 328 K,*** values are much better than those obtained using bimetallic-modified Zr/Ce-UiO-66 or amine-functionalized UiO-66-NH_(2).After five consecutive sorption and desorption cycles,the material retained a uranium removal rate of more than 80%,proving its excellent regenerative *** modeling of U(VI)adsorption on Zr/Ce-UiO-66-NH_(2) implied that chemisorption dominated the rapid uranium sorption *** propose potential adsorption mechanisms involving three interactions:inner-sphere surface complexation,chemisorption,and electrostatic *** study shows that the dual strategies of bimetallization and amination can effectively enhance U(VI)extraction from *** approach has potential applications for the structural design of uranium adsorbents.

关键词： MOF modification Zr/Ce-UiO-66-NH_(2) Adsorption uranium Adsorption mechanism

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Simple construction of the α-MnO2@ZIF-8 nanomaterial with highly enhanced U（Ⅵ） adsorption performance and assessed removal mechanism

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Progress in Natural Science:Materials International 2023年第4期33卷 508-517页

作者： Siyi Wang Yuxuan Bai Zhixiong Zhang Chengde Xie Wenhui Song Chen Wang Zhuoyu Ji Jianjun Wang MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University

In this study, the one-dimensional nanomaterial α-MnO2@ZIF-8 was satisfactorily fabricated using a simple hydrothermal method by modifying ZIF-8 on α-MnO2nanowires for high-performance extraction of U（Ⅵ） out of water solution. The experimental data indicated that the adsorption of U（Ⅵ） on α-MnO2@ZIF-8 was intensely dependent on solution pH but not on ionic strength. The maximum adsorption of U（Ⅵ） on α-MnO2@ZIF-8 at pH= 5.0 and T = 298 K was 802.36 mg/g, substantially higher than the adsorption on α-MnO2（22.32 mg/g） or ZIF-8（551.31 mg/g） under the same conditions, indicating that the performance of the modified α-MnO2was greatly enhanced. Attaining adsorption equilibrium within 45 min, the analytical kinetic process of α-MnO2@ZIF-8 indicated that its adsorption on U（Ⅵ） was monolayer chemisorption. The adsorption experiments and XPS analyzed the possible adsorption mechanism of U（Ⅵ） in the reaction with α-MnO2@ZIF-8 during the adsorption process, namely intra-sphere surface complexation, chemisorption and electrostatic interaction. The simple preparation and high removal efficiency of α-MnO2@ZIF-8 indicated that this adsorbent had good prospects for application in wastewater.

关键词： α-MnO2@ZIF-8 Adsorption Uranium Mechanism

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Asymmetrically coordinated single atom Cu catalyst with unsaturated C-Cu-N structure for CO_(2) reduction to CO

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Nano Research 2024年第5期17卷 3911-3918页

作者： Zheng Liu Yuxuan Liu Jingqiao Zhang Ting Cao Zhiyi Sun Juzhe Liu Huishan Shang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China SEPA Key Laboratory of Eco-Industry Chinese Research Academy of Environmental SciencesBeijing 100012China The Key Laboratory of Resources and Environmental System Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China

Single atom catalysts(SACs)play a crucial role in energy catalysis due to their distinct coordination environment and high atomic utilization *** study focuses on the synthesis of a monatomic Cu catalyst with Cu-N1C1 coordination anchored to N-doped Ti_(3)C_(2)T_(x) MXene(Cu SA@N-Ti_(3)C_(2)T_(x))to achieve efficient reduction of CO_(2) to *** characterization,including morphology and multispectral analysis,confirmed the uniform distribution of asymmetrically coordinated Cu atoms in unsaturated C-Cu-N bridge fragments on Ti_(3)C_(2)T_(x).The Cu SA@N-Ti_(3)C_(2)T_(x) catalyst exhibited an excellent CO selectivity with Faraday efficiency of 97.4%at-0.58 V *** hydrogen electrode(RHE)and satisfactory *** in situ X-ray absorption fine structure(XAFS)results confirmed that the carbon dioxide reduction reaction(CO_(2)RR)product distribution is mainly affected by potential-dependent valence change of Cu *** findings highlight the extensive potential of tuning coordination structure of MXene-based single-atom catalysts for CO_(2) reduction reactions.

关键词： cooper single atom atomic regulation MXene Ti_(3)C_(2)T_(x) CO_(2)reduction

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Adhesive surface-enhanced Raman scattering Cu-Au nanoassembly for the sensitive analysis of particulate matter

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Journal of environmental Sciences 2023年第6期128卷 35-44页

作者： Ning Wang Zhiqiang Gan Fengkui Duan Hui Chen Chensheng Ma Jie Ji Zhenli Sun MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Surface-enhanced Raman scattering(SERS)has been used in atmospheric aerosol detection as it enables the high-resolution analysis of particulate ***,its use in the detection of historical samples without damaging the sampling membrane while achieving effective transfer and the high-sensitivity analysis of particulate matter from sample films remains *** this study,a new type of SERS tape was developed,consisting of Au nanoparticles(NPs)on an adhesive double-sided Cu film(DCu).The enhanced electromagnetic field generated by the coupled resonance of the local surface plasmon resonances of AuNPs and DCu led to an enhanced SERS signal with an experimental enhancement factor of 10^(7).The AuNPs were semi-embedded and distributed on the substrate,and the viscous DCu layer was exposed,enabling particle *** substrates exhibited good uniformity and favorable reproducibility with relative standard deviations of 13.53%and 9.74%respectively,and the substrates could be stored for 180 days with no signs of signal *** application of the substrates was demonstrated by the extraction and detection of malachite green and ammonium salt particulate *** results demonstrated that SERS substrates based on AuNPs and DCu are highly promising in real–world environmental particle monitoring and detection.

关键词： Surfaced-enhanced Raman scattering Particulate matter Adhesive plasmonic coupling Electromagnetic enhancement

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In situ reconstruction induced oxygen-deficient multiphase Cu based species hybridized with Ni single atoms as tandem platform for CO_(2) electroreduction

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Nano Research 2024年第5期17卷 3888-3894页

作者： Juzhe Liu Yuheng Wang Pengpeng Mo Feng Yang Kaiqi Jiang Zhixiang Cheng Yuxuan Liu Zhiyi Sun Zheng Liu Yimei Zhang Wenxing Chen The Key Laboratory of Resources and Environmental System Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China SEPA Key Laboratory of Eco-Industry Chinese Research Academy of Environmental SciencesBeijing 100012China

Tandem catalysis,capable of decoupling individual steps,provides a feasible way to build a high-efficiency CO_(2) electro-conversion system for multicarbons(C_(2+)).The construction of electrocatalytic materials is one of focusing ***,we fabricated a single atom involved multivalent oxide-derived Cu composite material and found it inclined to reconstruct into oxygen-deficient multiphase Cu based species hybridized with monatomic Ni on N doped C *** this prototype,rapid CO generation and C-C coupling are successively achieved on NiN4 sites and surface amorphized Cu species with defects,resembling a micro-production *** this way,the in situ formed tandem catalyst exhibited a high Faradaic efficiency(FE)of~78%for C_(2+)products along with satisfactory durability over 50 ***,the reconstruction-induced amorphous layer with abundant asymmetric sites should be favorable to improve the ethanol selectivity(FE:63%),which is about 10 times higher than that of the non-tandem Cu-based contrast *** work offers a new approach for manipulating tandem catalyst systems towards enhancing C_(2+)products.

关键词： tandem catalysis single atom reconstruction amorphous CO_(2)reduction reaction

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Global Fire Season Types and Their Characteristics Based on MODIS Burned Area Data

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Chinese Geographical Science 2025年第2期35卷 374-383页

作者： ZHANG Weihan LIU Ronggao HE Jiaying LIU Yang WU Chao State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth System Science Ministry of Education Key Laboratory for Earth System Modeling Institute for Global Change Studies Tsinghua University

Fire season affects the dynamic changes of post-fire vegetation communities and carbon emissions. Analyzing its global patterns supports understanding of the ecological impacts of fires and responses of fires to climate change. Meteorological variables have been widely used to quantify fire season in current studies. However, their results can not be used to assess climate impacts on the seasonality of fire activities. Here we utilized satellite-based Moderate Resolution Imaging Spectroradiometer(MODIS) burned area data from 2001 to 2022 to identify global fire season types based on the number of peaks within a year. Using satellite data and innovatively processing the data to obtain a more accurate length of the fire season. We divided fire season types and examined the spatial distribution of fire season types across the K?ppen-Geiger climate(KGC) zones. At a global scale, we identified three major fire season types,including unimodal(31.25%), bimodal(52.07%), and random(16.69%). The unimodal fire season primarily occurs in boreal and tropical regions lasting about 2.7 mon. In comparison, temperate ecosystems tend to have a longer fire season(3 mon) with two peaks throughout the year. The KGC zones show divergent contributions from the fire season types, indicating potential impacts of the climatic conditions on fire seasonality in these regions.

关键词： fire season fire season types Moderate Resolution Imaging Spectroradiometer (MODIS) burned area data Koppen-Geiger climate classification system global terrestrial ecosystems

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Carbazole-Bearing Conjugated Microporous Polymer Electrodes for Uranium Extraction from Seawater with Good Anti-biofouling Feature

Chem and Bio Engineering

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Chem and Bio Engineering 2025年第1期2卷 53-63页

作者： Zhang, Xinyue Lei, Xinying Sun, Hongfei Ke, Hanming Xu, Jingxuan Yang, Yuhao Zhang, Sai Wen, Tao Ji, Zhuoyu Wang, Xiangke MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China Beijing Key Laboratory of Environmental and Viral Oncology College of Chemistry and Life Science Beijing University of Technology Beijing100124 China

Emerging electrochemical uranium extraction from seawater offers a promising route for a sustainable fuel supply for nuclear reactor operation. In this work, we intentionally synthesized a conjugated microporous polymer (CMP) with π-conjugated skeletons and permanent porosity, which was induced by in situ electropolymerization on flexible carbon cloths, followed by postdecorating amidoxime groups to create functional materials (CMP-AO). Driven by an extra asymmetrical alternating current electrochemical extraction, the self-supporting and binder-free electrode is exceptionally capable of selectively and rapidly capturing U(VI) from simulated solution, affording an extraction capacity of ∼1806.4 mg/g without saturation. Experimental observation in combination with ex/in situ spectroscopy revealed that CMP-AO enabled surface selective binding sites (amidoxime groups) to U(VI), followed by electrocatalytic reduction (carbazole groups) to yield yellow precipitates (Na2O(UO3·H2O)x) via reversible electron transfer in the presence of sodium electrolyte. Furthermore, the integrating adsorption-electrocatalysis system achieved an extraction capacity of 18.8 mg/g in real seawater for 21 days and good antibiofouling abilities, validating its feasibility for practical application. © 2024 The Authors. Co-published by Zhejiang University and American Chemical Society.

关键词： Electropolymerization

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Advanced porous materials and emerging technologies for radionuclides removal from Fukushima radioactive water

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Eco-Environment & Health 2023年第4期2卷 252-256页

作者： Xiaolu Liu Muliang Xiao Yang Li Zhongshan Chen Hui Yang Xiangke Wang MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China

Japan recently announced the plan to discharge over 1.2 million tons of radioactive water into the Pacific Ocean,which contained hazardous radionuclides such as^(60)Co,^(90)Sr,^(125)Sb,^(129)I,^(3)H,^(137)Cs,and^(99)TcO^(4)^(-),*** contaminated water will pose an enormous threat to global ecosystems and human *** materials and technologies for efficient radionuclide removal is highly desirable and arduous because of the extreme conditions,including super acidity or alkalinity,high ionic strength,and strong ionizing ***,advanced porous material,such as porous POPs,MOFs,COFs,PAFs,etc.,has shown promise of improved separation of radionuclides due to their intrinsic structural ***,emerging technologies applied to radionuclide removal have also been *** order to better deal with radionuclide contamination,higher requirements for the design of nanomaterials and technologies applied to practical radionuclide removal are ***,we call for comprehensive implementation of strategies and strengthened cooperation to mitigate the harm caused by radioactive contamination to oceans,atmosphere,soil,and human health.

关键词： Radioactive water Radionuclides removal Advanced porous materials Emerging technologies

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