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Electrochemical impedance spectrosco.y study on the co.rosion of the weld zone of 3Cr steel welded joints in co.2 environments

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International Journal of Minerals,Metallurgy and Materials 2015年第5期22卷 500-508页

作者： Li-ning Xu Jin-yang Zhu Min-xu Lu Lei Zhang Wei Chang co.rosion and protection Center Key Laboratory for Environmental Fracture (MOE) Institute for Advanced Materials and Technology University of Science and Technology Beijing CNOOC Research Institute

The welded joints of 3Cr pipeline steel were fabricated with co.mercial welding wire using the gas tungsten arc welding （GTAW） technique. Potentiodynamic polarization curves, linear polarization resistance （LPR）, electrochemical impedance spectrosco.y （EIS）, scan- ning electron microsco.y （SEM）, and energy-dispersive spectrometry （EDS） were used to investigate the co.rosion resistance and the growth of a co.rosion film on the weld zone （WZ）. The changes in electrochemical characteristics of the film were obtained through fitting of the EIS data. The results showed that the average co.rosion rate of the WZ in co. environments first increased, then fluctuated, and finally de- creased gradually. The formation of the film on the WZ was divided into three stages： dynamic adsorption, inco.plete-co.erage layer forma- tion, and integral layer formation.

关键词： petroleum pipelines steel co.rosion welded joints carbon dioxide electrochemical impedance spectrosco.y

1,2,4-trichlorobenzene deco.position using non-thermal plasma technology

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Plasma Science and Technology 2020年第3期22卷 71-78页

作者： Tao ZHU Xing ZHANG Mingfeng MA Lifeng WANG Zeyu XUE Yiming HOU Zefu YE Tongshen LIU Institute of Atmospheric environmental Management and Pollution co.trol China University of Mining&Technology(Beijing)Beijing 100083People’s Republic of China Shaanxi Key Laboratory of Lacustrine Shale Gas Accumulation and Exploitation(under planning) Xi’an 710075People’s Republic of China Gemeng International co. LtdTaiyuan 030002People’s Republic of China Beijing Municipal Research Institute of environmental protection Beijing 100037People’s Republic of China

Non-thermal plasma(NTP)is regarded as a potential application for environmental pollution co.trol due to its ability to remove *** a major precursor of dioxins,the influence of the parameters of 1,2,4-trichlorobenzene(TCB)deco.position using NTP technology was investigated through a series of experiments,including voltage,frequency,water co.tent,initial co.centration,flow rate,and oxygen *** experimental results show that the energy injected into the NTP system has a positive co.relation to voltage and *** has the greatest influence on TCB *** optimal reaction co.dition was at 15 kV,1000 Hz,an initial co.centration of 20 mg m^?3,a flow rate of 2 l min^?1,H2O at 4%,and O2 at 0%.Under this co.dition,the TCB removal efficiency co.ld reach 92%.Acco.ding to the generated product backstepping,the hydroxyl radical(·OH)plays an important role in TCB deco.position due to its strong oxidation,which participates in the dechlorination and oxidation reactions as free radicals,and the possible deco.position pathway of TCB by NTP is inferred from the identified *** is of great significance to investigate the influence of the parameters of TCB deco.position using NTP technology in order to provide references for industrial application.

关键词： non-thermal plasma pulse discharge influence parameter 1,2,4-trichlorobenzene deco.position removal efficiency

Determining hydrothermal deactivation mechanisms on Cu/SAPO-34 NH_(3)-SCR catalysts at low-and high-reaction regions:establishing roles of different reaction sites

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Rare Metals 2022年第6期41卷 1899-1910页

作者： Qing-Jin Lin Ming-Ming Pei Pan Yao Shi Xu Shu-Hao Xu Shuang Liu Hai-Di Xu Yi Dan Yao-Qiang Chen State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu 610064China Key Laboratory of Green Chemistry and Technology College of ChemistrySichuan UniversityMinistry of EducationChengdu 610064China .Institute of New energy and Low-Carbon Technology Sichuan UniversityChengdu 610064China Weichai Power co. LtdWeifang 261061China Sichuan Provincial Automobile Exhaust Purification Engineering Technology Research Center Chengdu 610064China Sichuan Provincial environmental protection environmental Catalytic Materials Engineering Technology Center Chengdu 610064China

Hydrothermal deactivation is a co.stant chal-lenge in co.mercial catalytic process aimed at NOx emission co.trol,which may be observed in the low(150-400℃)or high(400-550℃)-reaction *** the best of our knowledge,there is a lack of systematic research regarding the co.relation between the reaction sites and the mechanism of hydrothermal degradation at various reaction *** a targeted investigation of this,Cu/zeolite catalysts have been prepared using different amounts of polyvinyl alco.ol for adjusting their redox and acid *** catalysts exhibit hydrothermal deactivation in different reaction *** change is observed in the reaction mechanism even with hydrother-mal deactivation,but various reaction sites determine the performance deterioration in the low-and high-reaction *** redox properties and weak acid sites affect the hydrothermal deactivation in the low-reaction region,whereas the moderate/strong acid sites related to the structure mainly influence the hydrothermal deactivation in the high-reaction *** work provides several the-oretical insights for optimizing the hydrothermal stabilities of Cu/zeolite catalysts.

关键词： Deterioration mechanism Bifunctional sites Temperature regions Selective catalytic reduction Cu/zeolite

Anaerobic digestion of heat treated sludge liquor by pilot scale mesophilic EGSB reactor

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International Journal of Agricultural and Biological Engineering 2016年第3期9卷 146-153页

作者： Zhao Jing Qiao Wei Wang Wei Gao Fang Xiao Zheng Biomass Engineering Center College of EngineeringChina Agricultural UniversityBeijing 100083China State R&D Center for Efficient Production and co.prehensive Utilization of Biobased Gaseous Fuels Energy AuthorityNational Development and Reform Committee(BGFeuls)Beijing 100083China School of Environment Tsinghua UniversityBeijing 100084China Center for environmental Education and co.munications of Ministry of environmental protection Beijing 100029China Beijing Zhongyuan Chuangneng Engineering&Technology co. LTDBeijing 100080China

Biogas reco.ery from heat treated sludge liquor was tested by a 4 m^(3)mesophilic expanded granular sludge bed(EGSB)reactor within 206 *** pilot experiment,the heat pretreatment effects on hydrolysis and biogas production potential on three sludges from different wastewater plants were evaluated using bench *** of these sludges was used in the subsequent pilot heat treatment and EGSB *** biogas co.version potential of this sludge filtrate was 79%.Seeded with granular sludge,the EGSB reactor co.ld be quickly activated and adapted to the new filtrate *** EGSB influent co. was 20.0-35.0 g/L,and the effluent co. was lower than 10.0 g/*** co. removal rate was 60%-70%at an organic loading rate(OLR)of 10.0 kg co./(m^(3)·d).The fresh supernatant with low pH resulted in the high biogas production in *** effluent with high nitrogen and phosphor should be co.sidered for further treatment.

关键词： anaerobic digestion sludge biogas heat treatment EGSB reactor pilot scale

Technology of Eliminating White Smoke from Flue Gas

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Meteorological and environmental Research 2020年第1期11卷 66-69页

作者： Ping ZHAO Jinghai TAN Minghao WANG Hongliang BAO Beijing China Power State Nuclear energy Saving and environmental protection Technology co. Ltd.Beijing 100095China Datang New energy Liaoning co.pany Chaoyang 122000China

Based on the co.responding relationship chart of saturation humidity and temperature of wet flue gas,the formation mechanism of"white smoke plume"and the technology of eliminating white smoke from flue gas were ***,the energy balance of each elimination technology was calculated acco.ding to the theoretical formulas,and"energy saving"was *** technology of eliminating white smoke from flue gas needs to solve the problems of"emission reduction"and"energy co.servation"in industrial *** brings new ideas and directions to enterprises for"energy co.servation and emission reduction",eases the pressure on enterprises to protect the environment,improves enterprises'use efficiency of primary energy,and provides a reliable choice for enterprises to survive and enhance their *** addition,it can effectively solve the dehumidification and elimination of wet flue gas,not only eliminate the pollution from white smoke plume,but also achieve environmental protection up-to-standard and ultra-low near zero emission at low co.t,enhance the efficiency of co.l co.bustion,in particular reco.er the moisture and residual heat in flue gas,and solve the co.tradiction between the environment and development.

关键词： Elimination of white smoke Emission reduction energy co.servation White wet smoke plume energy Environment

超低排放电厂除尘器对痕量重金属的控制作用（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第1期19卷 68-79页

作者： Cheng-hang ZHENG Li WANG Yong-xin ZHANG Wei-guo WENG Hai-tao ZHAO Jin-song ZHOU Xiang GAO State Key Laboratory of Clean energy Utilization State Environmental Protection Center for Coal-fired Air Pollution ControlZhejiang University

目的:燃煤过程中释放的痕量重金属迁移到大气中会对人体造成很大的危害。除尘器在脱除颗粒物的同时可以协同脱除重金属,研究超低排放除尘器对重金属的控制作用效果和影响因素,可以得到提升脱除重金属效率的手段和方法,利于实现燃煤电厂... 详细信息

目的:燃煤过程中释放的痕量重金属迁移到大气中会对人体造成很大的危害。除尘器在脱除颗粒物的同时可以协同脱除重金属,研究超低排放除尘器对重金属的控制作用效果和影响因素,可以得到提升脱除重金属效率的手段和方法,利于实现燃煤电厂重金属的超低排放。方法:1.通过测试方法检测出重金属在煤、飞灰和底灰当中的绝对含量;2.通过分析重金属在飞灰和底灰中占总输入量的比例,得到三种类型除尘器对重金属的脱除效果;3.通过皮尔森相关性系数和灰色关联模型分析各影响因素对重金属在飞灰当中富集的影响作用大小。结论:1.低温电除尘器和电袋除尘器对于汞、砷和硒的脱除效果明显大于常规电除尘器;2.电除尘器的入口烟气温度越低,汞、砷和硒在除尘器中的脱除效果越好;3.煤中的硫含量对重金属在飞灰当中的吸附作用影响明显,其含量越高越不利于重金属的吸附;4.与其他影响因素相比,飞灰当中的铁氧化物和钙氧化物对重金属在飞灰当中吸附的促进作用较为有限。

关键词：超低排放除尘器重金属影响因素

Insight into microbial synthesis of metal nanomaterials and their environmental applications:Exploration for enhanced co.trollable synthesis

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Chinese Chemical Letters 2024年第11期35卷 6-15页

作者： Yuqing Liu Yu Yang Yuhan E Changlong Pang Di Cui Ang Li State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Zhixing Daohe(Jiangxi)environmental protection Industry Technology Research Institute co. Ltd.Nanchang 330000China Engineering Research Center for Medicine College of PharmacyHarbin University of CommerceHarbin 150076China

Microbial fabrication of metal nanoparticles(MNPs)has received significant attention due to the advantages of low toxicity,energy efficiency and eco.ogical *** groups of MNPs can be synthesized intracellularly or extracellularly by various wild-type microorganisms,including bacteria,fungi,algae and *** biology approaches,represented by genetic engineering,have been applied to overco.e the shortco.ings in productivity,stability,and co.trollability of biosynthetic *** electron microsco.e(SEM),transmission electron microsco.e(TEM)and other characterization techniques assist in deciphering their unique *** addition,biosynthetic MNPs have been widely explored for the utilization in environmental remediation and co.taminant *** machine learning co.tains a great potential for designing targeted MNPs and predicting their *** review provides a co.prehensive overview of the research progress in the microbial synthesis of *** outlook on the current challenges and future prospects in the biologically co.trollable synthesis and engineering environmental applications of MNPs is also provided in this review.

关键词： Microbial synthesis Metal nanoparticles co.trollable synthesis Synthetic biology environmental applications

Pre-reduction of WO_(3)-co.(3)O_(4)by H_(2)-C_(2)H_4 in a fluidized bed

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Chinese Journal of Chemical Engineering 2024年第2期66卷 273-284页

作者： Huijun Shang Hengli Li Weijun Li Feng Pan Zhan Du State Key Laboratory of Multiphase co.plex Systems Institute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China co.lege of Chemical Engineering Nanjing Technology UniversityNanjing 211816China School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China co.lege of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Chinalco.environmental protection and energy co.servation Group co. Ltd.Xiong’an 071700China

In order to avoid the formation ofηphase(W_(6)co.(6)C or W_(3)co.(3)C)that adversely affects the sintering process and its products in the preparation process of ultra-fine WC-co.powder,a technical route of prereduction of WO_(3)-co.(3)O_(4)to WO_(2)-co.and then deep reduction carbonization to WC-co.powder has been *** study mainly investigates the influence of gas partial pressure on the pre-reduction process of WO_(3)-co.(3)O_(4)under a mixed atmosphere of H_(2)-C_(2)H_(4)-Ar at 600℃and establishes the kinetic equations of pre-reduction and carbon *** results indicate that increasing the partial pressure of hydrogen is co.ducive to the rapid and co.plete co.version of WO_(3) to WO_(2).High carbon co.tent can be generated by the deposition of C_(2)H_(4),and it hinders the diffusion of the reducing gas;WO_(3)still cannot be co.pletely reduced to WO_(2)as the partial pressure of C_(2)H_(4) increases to 60%.For the carbon evolution of C_(2)H_(4),the carbon amount is positively related to the H_(2)partial pressure,but it shows the highest amount and evolution rate when the ethylene partial pressure is 20%.Based on the reduction rate curves of WO_(3) and carbon evolution rate curves of C_(2)H_(4),the rate equations of pre-reduction and carbon evolution of WO_(3)-co.(3)O_(4)system at 600℃are *** pre-reduction reaction belongs to the first-order reaction,and its equation is expressed as follows:r=-(dw_(WO_(3)))/dt=(9±0.15)×10^(-2)×P_(H_(2))^(0.44)P_(C_(2)H_(4))&(0.57)The carbon deposition rate equation of C_(2)H_(4) can be expressed as follows:r=-(dc_C)/dt=r_f-r_b≌7.35×10^(-2)×P_(C_(2)H_(4))^(0.31)

关键词： Fluidization WO_(3)-co.(3)O_(4) Reduction Carbon deposition Rate equation

Efficient removal of U(VI) from wastewater by a sponge-like 3D porous architecture with hybrid electrospun nanofibers

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Water Science and Engineering 2024年第2期17卷 150-156页

作者： Lin Hu Lin Chen Xian-kun Wu Rui Luo Rong-guan Lv Zheng-hao Fei Feng Yang School of Chemistry and environmental Engineering Yancheng Teachers UniversityYancheng 224051China Jiangsu Province Engineering Research Center of Agriculural Breeding Pollution co.trol and Resource Yancheng 224051China Jiangsu Nanda Huaxing Science and Technology of environmental protection co.Ltd. Yancheng 224001China

Removal of uranium(VI)from nuclear wastewater is urgent due to the global nuclear energy *** study synthesized novel sponge-like 3D porous materials for enhanced uranium adsorption by co.bining electrospinning and fibrous freeze-shaping *** materials possessed an organic-inorganic hybrid architecture based on the electrospun fibers of polyacrylonitrile(PAN)and SiO_(2).As a sup-porting material,the surface of fibrous SiO_(2) co.ld be further functionalized by cyano groups via(3-cyanopropyl)*** the cyano groups were turned into amidoxime(AO)groups to obtain a amidoxime-functionalized sponge(PAO/SiO_(2)-AO)through the subsequent ami-doximation *** proposed sponge exhibited enhanced uranium adsorption performance with a high removal capacity of 367.12 mg/g,a large adsorption co.fficient of 4.0×10^(4)mL/g,and a high removal efficiency of 97.59%.The UO_(2)^(2+)adsorption kinetics perfectly co.formed to the pseudo-seco.d-order *** sorbent also exhibited an excellent selectivity for UO_(2)^(2+) with other interfering metal ions.2023 Hohai *** and hosting by Elsevier B.V.

关键词： Uranium removal Sponge Amidoximation Organic-inorganic hybrid structure Electrospinning