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Facile low-temperature supercritical carbonization method to prepare high-loading nickel single atom catalysts for efficient photodegradation of tetracycline

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Journal of Environmental Sciences 2024年第4期138卷 373-384页

作者： Han Qiao Lirong Zheng shiwen hu Gang Tang Hongri Suo Chongxuan Liu School of Environment Harbin Institute of TechnologyHarbin 150090China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Environmental photocatalysis is a promising technology for treating antibiotics in *** this study,a supercritical carbonization method was developed to synthesize a single-atom photocatalyst with a high loading of Ni(above 5 wt.%)anchored on a carbonnitrogen-silicate substrate for the efficient photodegradation of a ubiquitous environmental contaminant of tetracycline(TC).The photocatalyst was prepared from an easily obtained metal-biopolymer-inorganic supramolecular hydrogel,followed by supercritical drying and carbonization *** low-temperature(300℃)supercritical ethanol treatment prevents the excessive structural degradation of hydrogel and greatly reduces the metal clustering and aggregation,which contributed to the high Ni *** characterizations confirmed that Ni was present at isolated sites and stabilized by Ni-N and Ni-O bonds in a Ni-(N/O)_(6)-C/SiC configuration.A 5%Ni-C-Si catalyst,which performed the best among the studied catalysts,exhibited a wide visible light response with a narrow bandgap of 1.45 eV that could efficiently and repeatedly catalyze the oxidation of TC with a conversion rate of almost 100% within 40 *** reactive species trapping experiments and electron spin resonance(ESR)tests demonstrated that the h+,and·O_(2)-were mainly responsible for TC *** TC degradation mechanism and possible reaction pathways were provided ***,this study proposed a novel strategy to synthesize a high metal loading singleatom photocatalyst that can efficiently remove TC with high concentrations,and this strategy might be extended for synthesis of other carbon-based single-atom catalysts with valuable properties.

关键词： Carbon-based single-atom catalyst Nickel Photocatalytic degradation Tetracycline Visible light

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Dynamic coupling of ferrihydrite transformation and associated arsenic desorption/redistribution mediated by sulfate-reducing bacteria

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Journal of Environmental Sciences 2024年第1期135卷 39-50页

作者： Wenjing Zhou huiyan Zhu shiwen hu Bowei Zhang Kun Gao Zhi Dang Chongxuan Liu State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSouth China University of TechnologyGuangzhou 510006China

Sulfate-reducing bacteria play an important role in the geochemistry of iron(oxyhydr)oxide and arsenic(As)in natural environments;however,the associated reaction processes are yet to be fully *** this study,batch experiments coupled with geochemical,spectroscopic,microscopic,and thermodynamic analyses were conducted to investigate the dynamic coupling of ferrihydrite transformation and the associated As desorption/redistribution mediated by Desulfovibrio vulgaris(***).The results indicated that *** could induce ferrihydrite transformation via S^(2-)-driven and direct reduction *** the absence of SO_(4)^(2-),*** directly reduced ferrihydrite,and As desorption and re-sorption occurred simultaneously during the partial transformation of ferrihydrite to *** increase in SO_(4)^(2-)loading promoted the S^(2-)-driven reduction of ferrihydrite and accelerated the subsequent mineralogical *** the low and medium SO_(4)^(2-)treatments,ferrihydrite was completely transformed to a mixture of magnetite and mackinawite,which increased the fraction of As in the residual phase and stabilized *** the high SO_(4)^(2-)treatment,although the replacement of ferrihydrite by only mackinawite also increased the fraction of As in the residual phase,22.1%of the total As was released into the solution due to the poor adsorption affinity of As to mackinawite and the conversion of As^(5+)to As^(3+).The mechanisms of ferrihydrite reduction,mineralogy transformation,and As mobilization and redistribution mediated by sulfate-reducing bacteria are closely related to the surrounding SO_(4)^(2-)*** results advance our understanding of the biogeochemical behavior of Fe,S,and As,and are helpful for the risk assessment and remediation of As contamination.

关键词： Sulfate-reducing bacteria Arsenic Ferrihydrite Transformation Redistribution

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Effects of zero-valent iron added in the flooding or drainage process on cadmium immobilization in an acid paddy soil

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Journal of Environmental Sciences 2024年第4期138卷 19-31页

作者： Hanbing Meng shiwen hu Zebin Hong Wenting Chi Guojun Chen Kuan Cheng QiWang Tongxu Liu Fangbai Li Kexue Liu Yang Yang Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China School of Resources and Planning Guangzhou Xinhua UniversityGuangzhou 510310China University of Chinese Academy of Sciences Beijing 100049China

Zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy ***,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain ***,Cd-contaminated paddy soil was incubated for 40days of flooding and then for 15 days of drainage,and the underlying mechanisms of Cd immobilization coupled with Fe/S/N redox processes were *** addition of ZVI to the flooding process was more conducive to Cd *** potential available Cd was detected by adding ZVI before flooding,which may be due to the increase in paddy soil pH and newly formed secondary Fe ***,the reductive dissolution of Fe minerals promoted the release of soil colloids,thereby increasing significantly the surface sites and causing Cd ***,the addition of ZVI before flooding played a vital role in Cd retention after soil *** contrast,the addition of ZVI in the drainage phase was not conducive to Cd retention,which might be due to the rapid decrease in soil pH that inhibited Cd adsorption and further immobilization on soil *** findings of this study demonstrated that Cd availability in paddy soil was largely reduced by adding ZVI during the flooding period and provide a novel insight into the mechanisms of ZVI remediation in Cd-contaminated paddy soils.

关键词： Paddy soil Zero-valent iron Cadmium Flooding and drainage Remediation

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Chromium transformation driven by iron redox cycling in basalt-derived paddy soil with high geological background values

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Journal of Environmental Sciences 2023年第3期125卷 470-479页

作者： Ke Zhang Yang Yang Wenting Chi Guojun Chen Yanhong Du shiwen hu Fangbai Li Tongxu Liu Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China

The flooding and drainage of paddy fields has great effects on the transformation of heavy metals, however, the transformation of Cr in basalt-derived paddy soil with high geological background values was less recognized. The typical basalt-derived paddy soil was incubated under alternating redox conditions. The Cr fractions and the dynamics of Fe/N/S/C were examined. The HCl-extractable Cr increased under anaerobic condition and then decreased during aerobic stage. The UV-vis spectra of the supernatant showed that amounts of colloids were released under anaerobic condition, and then re-aggregated during aerobic phase. The scanning transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS) revealed that Fe oxides were reduced and became dispersed during anaerobic stage, whereas Fe(Ⅱ) was oxidized and recrystallized under aerobic condition. Based on these results, a kinetic model was established to further distinguish the relationship between the transformation of Cr and Fe. During anaerobic phase, the reduction of Fe(Ⅲ) oxides not only directly released the structurally bound Cr, but also enhanced the breakdown of soil aggregation and dissolution of organic matter causing indirect mobilization of Cr. During aerobic phase, the oxidation of Fe (Ⅱ) and further recrystallization of newly formed Fe(Ⅲ) oxides might induce the re-aggregation of soil colloids and further incorporation of Cr. In addition,the kinetic model of Cr and Fe transformation was further verified in the pot *** model-based findings demonstrated that the Cr transformation in the basalt-derived paddy soil with high geological background values was highly driven by redox sensitive iron cycling.

关键词： Chromium Paddy soil Iron oxides Redox High geological background

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闽江河口湿地围垦稻田对土壤铁碳结合特征的影响

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海洋地质与第四纪地质 2024年第1期44卷 44-54页

作者：刘旭阳王纯郭萍萍方云英沈李东胡世文黑杰王亚非胥佳忆王维奇福建师范大学湿润亚热带生态-地理过程教育部重点实验室福州350117 福建闽江河口湿地生态系统国家定位观测研究站(国家林业和草原局) 福州350215 福建闽江河口湿地国家级自然保护区管理处福州350200 格里菲斯大学澳大利亚河流研究所和环境与科学学院南森校区昆士兰4111 南京信息工程大学应用气象学院南京210044 广东省科学院生态环境与土壤研究所广州510650

土壤铁氧化物结合态有机碳是有机碳长期维持的主要途径,但其机理研究仍较为薄弱。为探究河口湿地围垦稻田对土壤铁碳结合特征的影响,本研究选择福建省闽江河口天然芦苇湿地与围垦稻田为研究对象,对两种类型土壤中的铁结合态有机碳(Fe-OC... 详细信息

土壤铁氧化物结合态有机碳是有机碳长期维持的主要途径,但其机理研究仍较为薄弱。为探究河口湿地围垦稻田对土壤铁碳结合特征的影响,本研究选择福建省闽江河口天然芦苇湿地与围垦稻田为研究对象,对两种类型土壤中的铁结合态有机碳(Fe-OC)及其相关指标进行测定与分析。结果显示:①芦苇湿地围垦稻田改变了土壤氧化还原过程,显著影响土壤中铁相的转化。围垦后土壤二价铁[Fe(Ⅱ)]、三价铁[Fe(Ⅲ)]、活性总铁含量(HCl-Fe_(t))及Fe(Ⅲ)/Fe(Ⅱ)分别显著下降了24.68%、52.56%、51.45%、35.68%(P<0.05)。游离态氧化铁(Fe_(d))与无定形态铁(Fe_(o))含量分别显著下降了21.64%和29.24%(P<0.05),络合态铁(Fe_(p))含量则有所增加。②芦苇湿地围垦稻田显著影响土壤碳固存,Fe-OC与土壤有机碳含量(SOC)在围垦稻田后分别显著下降了39.03%和18.42%(P<0.05);芦苇湿地与稻田土壤Fe-OC均主要以吸附途径结合,稻田土壤Fe-OC对土壤有机碳的贡献率(fFe-OC)显著高于芦苇湿地(P<0.05)。③土壤全氮、含水量、电导率、铁以及土壤有机碳、溶解性有机碳与Fe-OC呈显著正相关(P<0.01)。本研究可为退耕还湿、土壤碳增汇提供科学参考。

关键词：铁铁结合态有机碳芦苇湿地稻田闽江河口

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The ABA synthesis enzyme allele OsNCED2^(T)promotes dryland adaptation in upland rice

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The Crop Journal 2024年第1期12卷 68-78页

作者： Liyu huang Yachong Bao shiwen Qin Min Ning Qinyan Li Qingmao Li Shilai Zhang Guangfu huang Jing Zhang Wensheng Wang Binying Fu Fengyi hu Key Laboratory of Biology and Germplasm Innovation of Perennial Rice from Ministry of Agriculture and Rural Affairs School of AgricultureYunnan UniversityKunming 650091YunnanChina National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

Upland rice shows dryland adaptation in the form of a deeper and denser root system and greater drought resistance than its counterpart,irrigated *** previous study revealed a difference in the frequency of the OsNCED2 gene between upland and irrigated populations.A nonsynonymous mutation(C to T,from irrigated to upland rice)may have led to functional variation fixed by artificial selection,but the exact biological function in dryland adaptation is *** this study,transgenic and association analysis indicated that the domesticated fixed mutation caused functional variation in OsNCED2,increasing ABA levels,root development,and drought tolerance in upland rice under dryland ***2-overexpressing rice showed increased reactive oxygen species-scavenging abilities and transcription levels of many genes functioning in stress response and development that may regulate root development and drought ***2^(T)-NILs showed a denser root system and drought resistance,promoting the yield of rice under dryland ***2^(T)may confer dryland adaptation in upland rice and may find use in breeding dryland-adapted,water-saving rice.

关键词： Upland rice Dryland adaptation ABA Root development Drought tolerance

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Fine-Grained Ship Recognition Based on Visible and Near-Infrared Multimodal Remote Sensing Images: Dataset,Methodology and Evaluation

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Computers, Materials & Continua 2024年第6期79卷 5243-5271页

作者： shiwen Song Rui Zhang Min hu Feiyao huang Department of Aerospace Science and Technology Space Engineering UniversityBeijing101416China

Fine-grained recognition of ships based on remote sensing images is crucial to safeguarding maritime rights and interests and maintaining national ***,with the emergence of massive high-resolution multi-modality images,the use of multi-modality images for fine-grained recognition has become a promising ***-grained recognition of multi-modality images imposes higher requirements on the dataset *** key to the problem is how to extract and fuse the complementary features of multi-modality images to obtain more discriminative fusion *** attention mechanism helps the model to pinpoint the key information in the image,resulting in a significant improvement in the model’s *** this paper,a dataset for fine-grained recognition of ships based on visible and near-infrared multi-modality remote sensing images has been proposed first,named Dataset for Multimodal Fine-grained Recognition of Ships(DMFGRS).It includes 1,635 pairs of visible and near-infrared remote sensing images divided into 20 categories,collated from digital orthophotos model provided by commercial remote sensing *** provides two types of annotation format files,as well as segmentation mask images corresponding to the ship ***,a Multimodal Information Cross-Enhancement Network(MICE-Net)fusing features of visible and near-infrared remote sensing images,has been *** the network,a dual-branch feature extraction and fusion module has been designed to obtain more expressive *** Feature Cross Enhancement Module(FCEM)achieves the fusion enhancement of the two modal features by making the channel attention and spatial attention work cross-functionally on the feature map.A benchmark is established by evaluating state-of-the-art object recognition algorithms on ***-Net conducted experiments on DMFGRS,and the precision,recall,mAP0.5 and mAP0.5:0.95 reached 87%,77.1%,83.8%and 63.9%,*** experiments demons

关键词： Multi-modality dataset ship recognition fine-grained recognition attention mechanism

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美国农村地区公共文化服务供给研究

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图书馆建设 2022年第4期 147-156页

作者：祁志伟胡世文中国人民大学公共管理学院中共国家税务总局党校教研三部

推动农村地区公共文化服务创新与发展是乡村振兴的必然要求,西方发达国家的实践可为我国提供借鉴和启示。以美国农村地区公共文化服务供给为例进行分析可以发现,美国公共文化服务供给体系与模式包含以下五个方面:公共文化服务供给的整... 详细信息

推动农村地区公共文化服务创新与发展是乡村振兴的必然要求,西方发达国家的实践可为我国提供借鉴和启示。以美国农村地区公共文化服务供给为例进行分析可以发现,美国公共文化服务供给体系与模式包含以下五个方面:公共文化服务供给的整体性体系、土著部落的公共文化服务供给体系、以公共图书馆为载体的公共文化服务供给模式、非营利组织参与公共文化服务供给的实践模式、社区参与公共文化服务供给的实践模式;美国农村地区公共文化服务的具体实践基于《农村一代》倡议,以创意为驱动,并依靠于清晰的政府职能设置和基金会的支持。参鉴美国的实践经验,我国亟需从以下三方面推动农村公共文化服务供给:强化政策与职能支持、构建多主体伙伴关系与挖掘潜在文化资源。

关键词：公共文化服务供给美国农村

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税务系统干部容错纠错制度执行现状及改进路径——基于全国708名税务干部的问卷调查分析

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湖南税务高等专科学校学报 2022年第2期35卷 45-51页

作者：胡世文中共国家税务总局党校江苏扬州225007

容错纠错制度发挥着激励干部群体改革创新、担当作为的重要治理效能。基于税务系统干部容错纠错制度执行现状的问卷调查发现,税务干部一方面对容错纠错制度的功能期待整体较高,另一方面对该制度的认知程度却有待提高。税务系统容错纠错... 详细信息

容错纠错制度发挥着激励干部群体改革创新、担当作为的重要治理效能。基于税务系统干部容错纠错制度执行现状的问卷调查发现,税务干部一方面对容错纠错制度的功能期待整体较高,另一方面对该制度的认知程度却有待提高。税务系统容错纠错制度体系建设及制度执行力均有进一步提升空间。有效提升税务系统容错纠错政策宣传教育质效、持续完善税务系统干部容错纠错制度体系建设以及不断增强税务系统干部容错纠错制度执行力度,成为未来提高税务系统容错纠错制度效能的路径选择。

关键词：税务干部容错纠错机制制度执行力

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R-matrix for the 8-Dimensional Spin Representation of Uq(so7)

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Acta Mathematica Sinica,English Series 2024年第2期40卷 485-497页

作者： Hong Mei hu Nai Hong hu School of Mathematical Sciences Suzhou University of Science and TechnologySuzhou 215009P.R.China School of Mathematical Sciences MOE Key Laboratory of Mathematics and Engineering Applications&Shanghai Key Laboratory of PMMPEast China Normal UniversityShanghai 200241P.R.China

The purpose of the paper is to describe the solution to the quantum Yang-Baxter equation associated with the 8-dimensional spin representation Tsp of Uq(so7).The self-duality of Tsp and the symmetry of the corresponding braiding matrix are ***,the minimal polynomial of the braiding R-matrix of Tsp is presented explicitly in an ingenious method by taking advantage of nice features of the spin representation Tsp.

关键词： Braiding R-matrix spin module minimal polynomial

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