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Promoting effect of FeOx addition on the mechanochemically prepared vanadium-based catalyst for real PCDD/Fs removal and mechanism insight

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Journal of Environmental Sciences 2024年第3期137卷 478-487页

作者： minghui tang Ling Wang Hongxian Li Xinlei Huang Cuicui Du Shengyong Lu State Key Laboratory for Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

Industrial-use VOx-based catalysts usually have a higher active temperature window (>250-300℃),which becomes a“bottleneck”for the practical application of PCDD/Fs catalytic degradation technology.In this work,VO_(x)-FeO_(x)/TiO_(2) catalyst prepared via mechanochemically method was investigated for the catalytic removal of PCDD/Fs.The removal efficiency of 1,2-DCBz,pure PCDD/Fs gas generated in the lab,PCDD/Fs from actual fue gas,long-term were studied,and the degradation mechanism was explored using FTIR and TOFMS.The degradation efficiency of 1,2-DCBz and PCDD/Fs on VO_(x)-FeO_(x)/TiO_(2) were higher than that of VO_(x)/TiO_(2)catalyst,and the optimal FeOx addition ratio was 3 wt.%.The characterization results show that the addition of FeOx can effectively improve the pore structure,surface acidity,and VOx dispersion of the catalyst,thus contributing to increasing the V^(5+)content and surface-active oxygen,which is conducive to the improvement of adsorption and redox performance of the catalyst.Under the actual MSWI (municipal solid waste incineration)fue gas,the PCDD/Fs removal efficiency over VTi-3Fe-MC maintained long-term stability,higher than 85%for 240 min.This result was not significantly reduced compared with the data obtained in the laboratory.According to the analysis results of intermediate products by FTIR and GC-TOFMS,it can be inferred that the epoxidation fracture of benzene ring is the rate-limiting step of dioxin catalytic degradation reaction.This work gives an in-depth view into the PCDD/Fs removal over VO_(x)-FeO_(x)/TiO_(2) catalysts and could provide guidelines for the rational design of reliable catalysts for industrial applications.

关键词： PCDD/F removal MSWI fue gas VO_(x)-FeO_(x)/TiO_(2) Mechanochemical GC-TOFMS

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Enhancing mechanisms of N-doped biomass carbon on the vanadium-based catalyst for furan degradation at low temperature

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Waste Disposal and Sustainable Energy 2024年第1期6卷 1-9页

作者： Ling Wang minghui tang Hongxian Li Jiamin Ding Juan Qiu Shengyong Lu State Key Laboratory of Clean Energy Utilization Zhejiang University38#Zheda RoadHangzhou310027China Taizhou Institute of Zhejiang University Taizhou318012China Qingshanhu Energy Research Center Zhejiang University1699 Dayuan RoadQingshanhu Science and Technology CityHangzhou311300China

Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans(PCDD/Fs)have attracted widespread concern due to their high toxicity,and their difficult manipulation in laboratories has made the research process tough.Thus,in our work,furan is selected as the model compound owing to the same structure of a central oxygenate ring.Although catalytic oxidation is regarded as an effective and applicable method for the abatement of PCDD/Fs,the synthesis of low-temperature catalysts is still a challenging problem in practical applications.Considering this situation,we prepared a novel V_(2)O_(5)/TiO_(2)catalyst modified with N-doped hierarchical porous carbon(NHPC)via a wet impregnation method.The V/T-1%NHPC catalyst could achieve expectant low-temperature performances with 50%furan conversion at 150℃and a complete conversion at 200℃,which decreased 23℃and 40℃compared to the V/T catalyst respectively.Moreover,the addition of NHPC presented lifting chemical stability during long-time test.The addition of NHPC in V/T catalysts decreased the formation of crystalline V_(2)O_(5) and increased the percentages of V^(5+)and O_(lat),which improved the utilization of vanadium ions and the catalytic activity.Simultaneously,the higher binding energy shift of O_(lat) implied more reaction possibility with other oxidise reactants.Importantly,this work proved the lifting catalytic activity by the interaction between catalysts and NHPC,and proposed the promoting effects of the N element.The results showed that the content of the pyridinic N and graphitic N in NHPC changed after combining with V/T catalyst,which played crucial roles in the excellent catalytic performance.Overall,this work provides comprehensive research of the V/T-1%NHPC catalyst toward furan oxidation at low temperature and explain the effects of N-doped biomass carbon in catalytic activity clearly,which gave a new thought to design low-temperature catalysts in PCDD/Fs degradation.Besides,the internal functional mechanisms of N species are worth further exploratio

关键词： Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans Furan Low-temperature catalyst V_(2)O_(5)/TiO_(2)catalyst N-doped

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Simultaneous removal of 1,2-dichlorobenzene and furan over Mn-Ce-Fe oxide catalyst:Catalytic activity and product analysis

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Journal of Rare Earths 2024年第5期42卷 972-979,I0006页

作者： Juan Qiu minghui tang Yaqi Peng Xuanhao Guo Shengyong Lu Jianhua Yan Taizhou Institute of Zhejiang University Taizhou 318000China State Key Laboratory for Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The Mn-Ce-Fe mixed oxide(MCFe)was prepared by co-precipitation and the catalytic performance was tested by using 1,2-dichlorobenzene(1,2-DCB)and furan as model molecules of PCDD/F.The effect of O_(2)concentration,SO_(2) and NO on the catalytic activity was studied.At 270℃,the MCFe oxide catalyst presents significant simultaneous removal efficiency of 75.25%and 100%for 1,2-DCB and furan,respectively.Brunauer-Emmett-Teller(BET)method(BET),X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR),H_2-temperature programmed reduction(H_(2)-TPR),NH_(3)-temperature programmed desorption(NH_3-TPD)and O_(2)-TPD were used to characterize the catalysts before and after the reaction.Competition tests suggest that the oxidation behavior of furan occurred prior to that of 1,2-DCB.According to the intermediate products detected by gas chromatography-mass spectrometry(GC-MS),the by-products include chlorinated hydrocarbons,long-chain hydrocarbons,ketone,etc.Possible catalytic oxidation reaction paths are proposed.

关键词： 1 2-dichlorobenzene Furan Catalytic oxidation Product analysis Rare earths

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Analyzing Disaster Mitigation Policies in Japan and China from an Eco-DRR Perspective:A Comparative Study of Shanghai and Tokyo

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Journal of Architectural Research and Development 2024年第1期8卷 14-19页

作者： minghui tang Naoko Fujita Art and Design University of TsukubaTsukuba 3058577IbarakiJapan

Global climate change-induced natural disasters require international efforts and the adoption of Eco-Disaster Risk Reduction(Eco-DRR)policies for sustainable development.This study examines the status of Eco-DRR in disaster prevention policies through word cloud analysis,providing insights for policymakers to enhance disaster prevention amid increasing climate-related challenges.Tokyo and Japan prioritize soft aspects,while Shanghai and China emphasize engineering for flood prevention,revealing a gap in Eco-DRR application.Despite these differing approaches,the shared focus on water-related disasters indicates a shift towards urban resilience.Future research should assess policy effectiveness and the impact of Eco-DRR on disaster risk reduction and ecosystem protection.

关键词： Disaster Policy Eco-DRR Word-cloud

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Manure substitution improves maize yield by promoting soil fertility and mediating the microbial community in lime concretion black soil

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Journal of Integrative Agriculture 2024年第2期23卷 698-710页

作者： minghui Cao Yan Duan Minghao Li Caiguo tang Wenjie Kan Jiangye Li Huilan Zhang Wenling Zhong Lifang Wu The Center for Ion Beam Bioengineering&Green Agriculture Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Zhongke Taihe Experimental Station Taihe 236626China Institute of Resources and Environment Jiangsu Academy of Agricultural SciencesNanjing 210014China

Synthetic nitrogen(N)fertilizer has made a great contribution to the improvement of soil fertility and productivity,but excessive application of synthetic N fertilizer may cause agroecosystem risks,such as soil acidification,groundwater contamination and biodiversity reduction.Meanwhile,organic substitution has received increasing attention for its ecologically and environmentally friendly and productivity benefits.However,the linkages between manure substitution,crop yield and the underlying microbial mechanisms remain uncertain.To bridge this gap,a three-year field experiment was conducted with five fertilization regimes:i)Control,non-fertilization;CF,conventional synthetic fertilizer application;CF_(1/2)M_(1/2),1/2 N input via synthetic fertilizer and 1/2 N input via manure;CF_(1/4)M_(3/4),1/4 N input synthetic fertilizer and 3/4 N input via manure;M,manure application.All fertilization treatments were designed to have equal N input.Our results showed that all manure substituted treatments achieved high soil fertility indexes(SFI)and productivities by increasing the soil organic carbon(SOC),total N(TN)and available phosphorus(AP)concentrations,and by altering the bacterial community diversity and composition compared with CF.SOC,AP,and the soil C:N ratio were mainly responsible for microbial community variations.The co-occurrence network revealed that SOC and AP had strong positive associations with Rhodospirillales and Burkholderiales,while TN and C:N ratio had positive and negative associations with Micromonosporaceae,respectively.These specific taxa are implicated in soil macroelement turnover.Random Forest analysis predicted that both biotic(bacterial composition and Micromonosporaceae)and abiotic(AP,SOC,SFI,and TN)factors had significant effects on crop yield.The present work strengthens our understanding of the effects of manure substitution on crop yield and provides theoretical support for optimizing fertilization strategies.

关键词： fertilization manure substitution soil fertility maize yield bacterial community

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Solvothermal preparation of Mn-based catalysts for simultaneous removal of 1,2-dichlorobenzene and furan

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Waste Disposal and Sustainable Energy 2022年第2期4卷 105-116页

作者： Juan Qiu Yaqi Peng minghui tang Shengyong Lu Xiaodong Li Jianhua Yan State Key Laboratory for Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

In this study,Mn-based bimetallic oxide catalysts were synthesized via the solvothermal method.Different metals(Ce,Co and Fe)exhibited a great impact on the physicochemical properties of catalysts,resulting in different catalytic activities for the simultaneous removal of 1,2-dichlorobenzene(1,2-DCB)and furan,as a model of polychlorinated dibenzodioxins and dibenzo-furans(PCDD/Fs).Fe–MnOx presented the best catalytic activity,with a removal efficiency of 62%for 1,2-DCB and 100%for furan at 240℃.Several analytical techniques were employed,namely,Brunauer–Emmett–Teller(BET),X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),H_(2)temperature-programmed reduction(H_(2)-TPR),and ammonia temperature programmed desorption(NH_(3)-TPD).Compared with pure MnOx catalysts,Fe–MnOx shows a higher specific surface area of 117.9 m^(2)/g.SEM observations showed flower-like nanosheet structures for Fe–MnOx.XPS analysis indicated that Mn^(4+)/Mn^(3+)and active oxygen play the key roles in the catalytic oxidation of 1,2-DCB and furan.The catalytic activity,selectivity and stability of Mn-based bimetallic oxide catalysts for the oxidation of 1,2-DCB and furan were tested.Competition exists between 1,2-DCB and furan such that the adsorption of furan occurs prior to 1,2-DCB.

关键词： Polychlorinated dibenzodioxins and dibenzo-furans 1,2-dichlorobenzene Catalytic oxidation Fe–MnOx Product analysis

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Predicting effect factors of dual bag filter system for PCDD/Fs removal from hazardous waste incineration flue gas

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Waste Disposal and Sustainable Energy 2023年第2期5卷 177-187页

作者： Yanan Li Qi Liu minghui tang Fei Wang Shengyong Lu Makwarimba Chengetai Portia Yong Chi State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

The dual bag filter(DBF)system is a new polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans(PCDD/Fs)emission control technology that has more efficient(PCDD/Fs)removal performance,a higher activated carbon utilization rate and less activated carbon consumption compared with the traditional single bag filter system.Moreover,few studies have been relevant to the mechanism of the PCDD/Fs removal process in the DBF system,and the selection of operating conditions of the DBF system lacks an academic basis.This study established a PCDD/Fs removal efficiency model of activated carbon injection combined bag filter(ACI+DBF)system for hazardous waste incineration flue gas and predicted the crucial effect factors.New adsorption coefficients k_(1)=532,145 Nm^(3)/(mol s)and k_(2)=45 Nm^(3)/(mol s),and the relationship expression between the number of available adsorption positions of recycled AC(AAC′)and cycle times(n)are proposed in the model.The results verify that the model error was below 5%.In addition,the PCDD/Fs removal efficiency model predicts that in a certain range,the PCDD/Fs removal efficiency increases with increasing activated carbon injection concentration.The best cycle number of activated carbon was less than 3,and the ratio of circulating activated carbon to fresh activated carbon in second bag filter(SBF)should be controlled at 7–8.

关键词： PCDD/Fs removal Hazardous waste Activated carbon Dual bag filter Removal efficiency model

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危重症的疾病轨迹研究——应用、实例与展望

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中华危重病急救医学 2024年第3期36卷 231-236页

作者：汤明慧李逊卢秀兰南华大学儿科学院湖南长沙410007 湖南省儿童医院重症医学科长沙410007 湖南儿科医学研究所长沙410007

轨迹是指物体在空间中遵循的运动路径,而疾病轨迹作为一种描绘疾病过程随时间演变的方式,具有评估病情、制定治疗策略和预测预后的重要意义。危重症是导致患者死亡的主要原因之一。随着重症医学的发展,研究人员和临床医生对危重症疾病... 详细信息

轨迹是指物体在空间中遵循的运动路径,而疾病轨迹作为一种描绘疾病过程随时间演变的方式,具有评估病情、制定治疗策略和预测预后的重要意义。危重症是导致患者死亡的主要原因之一。随着重症医学的发展,研究人员和临床医生对危重症疾病发生发展过程的关注日益增加。了解危重症疾病的发展轨迹,有助于促进对高危患者的早期识别、干预与治疗,避免病程延长,降低多器官功能衰竭的发生风险,为制定针对性的预防和干预策略提供重要参考,从而降低危重症疾病的发生率和病死率。近年来,轨迹建模方法逐渐被应用于危重症疾病的研究,常用的建模方法包括但不限于潜变量增长曲线模型(LGCM)、增长混合模型(GMM)、基于组的轨迹模型(GBTM)、潜在转变分析(LTA)及潜在类别分析(LCA)等。本文围绕疾病轨迹的定义、轨迹建模方法及其在危重症疾病研究中应用的进展进行综述,并提出展望。

关键词：疾病轨迹轨迹模型危重症应用预后

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Crystallization Behavior of Nd_2O_3 Doped Na_2O–CaO–SiO_2 Laser Glass-ceramics

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Journal of Materials Science & Technology 2015年第11期31卷 1158-1160页

作者： Shuming Wang Fenghua Kuang Dazhan Zhang Xu Zhou minghui tang Department of Materials Science and Engineering University of Science & Technology Beijing

For the desirable laser optical property, transition metals or rare-earths are always doped into parent glasses as active ions, and this doping will affect the crystallization of the precursor glasses inevitably. In this work, crystallization behavior of NaO-CaO-SiO2 system glasses doped with Nd2O3 was investigated. The crystallization kinetic parameters including the crystallization apparent activation energy （E） and the Avrami parameter （n） were also measured. The results show that the NaO-CaO-SiO2 system glassceramics with the NaxCa2Si3O9 crystal as primary phase can be highly crystalized as above 90%. The Nd2O3 doping has a significant influence on the crystallization apparent activation energy and the Avrami parameter, which affect the crystallization behavior and morphology of the transparent glass-ceramics of this system.

关键词： Crystallization behavior Activation energy Transparent Laser glass-ceramics

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施肥旱作农田土壤中人类病原菌群落组成及动态变化特征

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浙江大学学报（农业与生命科学版） 2024年第1期50卷 98-108页

作者：齐明慧程建华唐翔宇浙江农林大学林业与生物技术学院省部共建亚热带森林培育国家重点实验室浙江杭州311300 中国科学院、水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室四川成都610041

采集浙江省杭州、嘉兴、衢州、金华、龙游5个地区长期施用鸡粪、猪粪或化肥的农田土壤进行室内培养实验,然后采用高通量测序及序列比对方法分析供试土壤细菌和人类病原菌(human pathogenic bacteria,HPB)群落组成,旨在进一步探究施用粪... 详细信息

采集浙江省杭州、嘉兴、衢州、金华、龙游5个地区长期施用鸡粪、猪粪或化肥的农田土壤进行室内培养实验,然后采用高通量测序及序列比对方法分析供试土壤细菌和人类病原菌(human pathogenic bacteria,HPB)群落组成,旨在进一步探究施用粪肥后土壤中HPB群落组成差异及动态变化特征。结果表明:在160个供试土壤样品和2种粪肥样品中共比对到75种HPB,其中优势HPB为巨大芽孢杆菌(Bacillus_megaterium_QM_B1551,24.2%)和拜氏梭菌(Clostridium_beijerinckii_NCIMB_8052,23.1%);施用猪粪处理的土壤中细菌和HPB的香农(Shannon)指数均有所降低,而施用鸡粪或化肥处理的土壤中细菌和HPB多样性无明显变化。主坐标分析结果表明,施用粪肥处理的土壤细菌群落组成与未施肥对照之间具有显著差异,尤其是施用猪粪处理差异最显著(P<0.001);土壤样品间共有HPB占所有HPB的22.7%;施用粪肥处理的土壤中大部分HPB的相对丰度高于未施肥对照,并随培养时间的延长而不断下降。方差分解分析结果表明,土壤理化性质、细菌群落及两者交互作用是土壤中HPB变异的重要因素。综上所述,施用粪肥处理的土壤中HPB的变化特征主要受肥料类型、土壤类型、土壤理化性质及固有细菌群落的影响。

关键词：人类病原菌粪肥细菌群落土壤动态变化

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