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Enhanced dechlorination of 2,4-dichlorophenol by recoverable Ni/Fe–Fe_3O_4 nanocomposites

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Journal of Environmental Sciences 2016年第10期28卷 92-101页

作者： cancan xu Rui Liu Lvjun Chen Jialu Tang Zhejiang Provincial Key Laboratory of Water Science and Technology Department of Environment Yangtze Delta Region Institute of Tsinghua University School of Environment Tsinghua University

Ni/Fe-Fe3O4 nanocomposites were synthesized for dechlorination of 2,4-dichlorophenol （2,4-DCP）. The effects of the Ni content in Ni/Fe-Fe3O4 nanocomposites, solution pH, and common dissolved ions on the dechlorination efficiency were investigated, in addition to the reusability of the nanocomposites. The results showed that increasing content of Ni in Ni/Fe-FesO4 nanocomposites, from 1 to 5 wt.%, greatly increased the dechlorination efficiency; the Ni/Fe-Fe3O4 nanocomposites had much higher dechlorination efficiency than bare Ni/Fe nanoparticles. Ni content of S wt.% and initial pH below 6.0 was found to be the optimal conditions for the catalytic dechlorination of 2,4-DCP. Both 2,4-DCP and the intermediate product 2-chlorophenol （2-CP） were completely removed, and the concentra- tion of the final product phenol was close to the theoretical phenol production from complete dechlorination of 20 mg/L of 2,4-DCP, after 3 hr reaction at initial pH value of 6.0, 3 g/L Ni/Fe-Fe3O4, S wt.% Ni content in the composite, and temperature of 22℃ 2,4-DCP dechlorination was enhanced by C1- and inhibited by NO3- and SO42-. The nanocomposites were easily separated from the solution by an applied magnetic field. When the catalyst was reused, the removal efficiency of 2,4-DCP was almost 100% for the first seven uses, and gradually decreased to 75% in cycles 8-10. Therefore, the Ni/Fe-Fe3O4 nanocomposites can be considered as a potentially effective tool for remediation of Pollution bv 2.4-DCP.

关键词： Ni/Fe-Fe3O4 nanocomposites2 4-DichlorophenolCatalytic dechlorinationRecoverableCommon dissolved ions

Evaluation of photochemistry reaction kinetics to pattern bioactive proteins on hydrogels for biological applications

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Bioactive Materials 2018年第1期3卷 64-73页

作者： Taylor B.Dorsey Alexander Grath Annling Wang cancan xu Yi Hong Guohao Dai Department of Biomedical Engineering Rensselaer Polytechnic InstituteTroyNY 12180USA Center for Biotechnology and Interdisciplinary Studies Rensselaer Polytechnic InstituteTroyNY 12180USA Department of Bioengineering Northeastern UniversityBostonMA 02115USA Department of Bioengineering University of Texas at ArlingtonArlingtonTX 76019USA

Bioactive signals play many important roles on cell function and *** most biological studies,soluble biochemical cues such as growth factors or cytokines are added directly into the media to maintain and/or manipulate cell activities in ***,these methods cannot accurately mimic certain in vivo biological signaling motifs,which are often immobilized to extracellular matrix and also display spatial gradients that are critical for tissue *** biochemical cues,biophysical properties such as substrate stiffness can influence cell behavior but is not easy to manipulate under conventional cell culturing *** development in photocrosslinkable hydrogels provides new tools that allow precise control of spatial biochemical and biophysical cues for biological applications,but doing so requires a comprehensive study on various hydrogel photochemistry kinetics to allow thorough photocrosslink reaction while maintain protein bioactivities at the same *** this paper,we studied several photochemistry reactions and evaluate key photochemical parameters,such as photoinitiators and ultra-violet(UV)exposure times,to understand their unique contributions to undesired protein damage and cell *** data illustrates the retention of protein function and minimize of cell health during photoreactions requires careful selection of photoinitiator type and concentration,and UV exposure *** also developed a robust method based on thiol-norbornene chemistry for independent control of hydrogel stiffness and spatial bioactive ***,we highlight a class of bioactive hydrogels to stiffness control and site specific immobilized bioactive proteins/peptides for the study of cellular behavior such as cellular attraction,repulsion and stem cell fate.

关键词： Photo-patterning Bioactive signals PEG hydrogels Click-chemistry

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美国退役坝拆除背景与原因剖析

水利水电科技进展 2017年第1期37卷 43-49页

作者：胡苏萍徐灿灿李弘南京水利科学研究院江苏南京210029

为全面、客观反映美国退役坝拆除的真实情况,通过文献检索和专题调研,在综述美国退役坝拆除背景及现状的基础上,分析了美国拆坝的主要原因,即环境、安全和经济因素。案例研究表明,美国拆坝旨在消除老化坝的安全风险,恢复溯河性鱼类洄游... 详细信息

为全面、客观反映美国退役坝拆除的真实情况,通过文献检索和专题调研,在综述美国退役坝拆除背景及现状的基础上,分析了美国拆坝的主要原因,即环境、安全和经济因素。案例研究表明,美国拆坝旨在消除老化坝的安全风险,恢复溯河性鱼类洄游以及节省无成本效益的开支。水坝退役是水坝生命周期管理中的一个重要阶段,拆坝并不意味着不能建坝,目前水电仍然是美国最大的可再生能源电力来源。美国在水坝退役方面的理念和经验可为我国水库降等与报废管理提供借鉴。

关键词：拆坝退役坝河流修复案例研究美国

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微生物合成纳米材料及其在环境修复中的应用

工业安全与环保 2012年第10期38卷 17-19,34页

作者：徐灿灿肖翔杜道林江苏大学江苏镇江212013

通过生物方法合成纳米材料的新型绿色合成技术已经成为纳米材料研究领域的热点之一。很多微生物包括细菌、放线菌、酵母、丝状真菌等都被证实具有合成纳米材料的能力。目前,利用微生物合成纳米材料的技术已经受到国际上的广泛重视,并取... 详细信息

通过生物方法合成纳米材料的新型绿色合成技术已经成为纳米材料研究领域的热点之一。很多微生物包括细菌、放线菌、酵母、丝状真菌等都被证实具有合成纳米材料的能力。目前,利用微生物合成纳米材料的技术已经受到国际上的广泛重视,并取得了飞快的发展。

关键词：生物合成纳米材料微生物修复绿色技术

Selenium deficiency exacerbates ROS/ER stress mediated pyroptosis and ferroptosis induced by bisphenol A in chickens thymus

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Journal of Environmental Sciences 2025年第2期148卷 13-26页

作者： Kun Wang xu Shi Hongjin Lin Tong xu Shiwen xu College of Veterinary Medicine Northeast Agricultural UniversityHarbin 150030China Key Laboratory of the Provincial Education Department of Heilongjiang for Common Animal Disease Prevention and Treatment Harbin 150030China

Bisphenol A(BPA)is an industrial pollutant that can cause immune *** acts as an antioxidant,as selenium deficiency often accompanies oxidative stress,resulting in organ *** study is the first to demonstrate that BPA and/or selenium deficiency induce pyroptosis and ferroptosis-mediated thymic injury in chicken and chicken lymphoma cell(MDCC-MSB-1)via oxidative stress-induced endoplasmic reticulum(ER)*** established a broiler chicken model of BPA and/or selenium deficiency exposure and collected thymus samples as research subjects after 42 *** results demonstrated that BPA or selenium deficiency led to a decrease in antioxidant enzyme activities(T-AOC,CAT,and GSH-Px),accumulation of peroxides(H2O2 and MDA),significant upregulation of ER stress-relatedmarkers(GRP78,IER 1,PERK,EIF-2α,ATF4,and CHOP),a significant increase in iron ion levels,significant upregulation of pyroptosis-related gene(NLRP3,ASC,Caspase1,GSDMD,IL-18 and IL-1β),significantly increase ferroptosis-related genes(TFRC,COX2)and downregulate GPX4,HO-1,FTH,*** vitro experiments conducted in MDCC-MSB-1 cells confirmed the results,demonstrating that the addition of antioxidant(NAC),ER stress inhibitor(TUDCA)and pyroptosis inhibitor(Vx765)alleviated oxidative stress,endoplasmic reticulum stress,pyroptosis,and ***,this study concludes that the combined effects of oxidative stress and ER stress mediate pyroptosis and ferroptosis in chicken thymus induced by BPA exposure and selenium deficiency.

关键词： Bisphenol A Selenium deficiency ROS/ER stress Pyroptosis Ferroptosis Thymic injury

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基于Arcpy自动提取清涧河流域水系特征

水力发电 2017年第3期43卷 30-33页

作者：何灿灿徐翠玲宋敦江长安大学地球科学与资源学院陕西西安710054 中国科学院科技政策与管理研究所北京100190

水系特征的提取是进行流域水文分析的基础,快速、有效地获取流域水系信息是水文分析的内在需求。依据Arcpy可以用Python语言调用ArcGIS地理工具的特点,提出了一种基于Arcpy自动提取水系特征的方法。首先,确定水系特征提取工具和模块;其... 详细信息

水系特征的提取是进行流域水文分析的基础,快速、有效地获取流域水系信息是水文分析的内在需求。依据Arcpy可以用Python语言调用ArcGIS地理工具的特点,提出了一种基于Arcpy自动提取水系特征的方法。首先,确定水系特征提取工具和模块;其次,根据ArcHydro提取流程编写脚本;最后,运行程序成功提取出清涧河流域水系特征。实验表明,基于Arcpy自动提取水系的方法是切实可行的。提取不同阈值下的清涧河水系与1∶25万数字化水系对比结果也显示,当阈值为4.05 km^2时提取的河网与实际水系较吻合。

关键词：水系特征自动提取 Arcpy ArcHydroTools 清涧河流域

Reducing the measurement errors in nonadiabatic holonomic quantum computers

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 60-66页

作者： Guo-Fu xu Department of Physics Shandong UniversityJinan 250100China

Nonadiabatic holonomic quantum computers serve as the physical platform for nonadiabatic holonomic quantum *** quantum computation has entered the noisy intermediate-scale era,building accurate intermediate-scale nonadiabatic holo-nomic quantum computers is clearly *** that measurements are the sole means of extracting information,they play an indispensable role in nonadiabatic holonomic quantum ***,developing methods to reduce measurement errors in nonadiabatic holonomic quantum computers is of great ***,while much attention has been given to the research on nonadiabatic holonomic gates,the research on reducing measurement errors in nonadiabatic holonomic quantum computers is severely *** this study,we propose a measurement error reduction method tailored for intermediate-scale nonadiabatic holonomic quantum *** reason we say this is because our method can not only reduce the measurement errors in the computer but also be useful in mitigating errors originating from nonadiabatic holonomic *** these features,our method significantly advances the construction of accurate intermediate-scale nonadiabatic holonomic quantum computers.

关键词： quantum holonomy quantum computation measurement errors

Fe0还原、芬顿氧化及其耦合技术去除染料厂剩余污泥中的AOX

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环境工程学报 2017年第9期11卷 5227-5232页

作者：王成徐灿灿刘锐李国华陈吕军浙江工业大学化学工程学院杭州310014 浙江清华长三角研究院生态环境研究所浙江省水质科学与技术重点实验室嘉兴314006 清华大学环境学院北京100084

染料废水中含有大量难生物降解的卤代有机物合成中间体,合成卤代有机物在废水的生物处理过程中容易被吸附到剩余污泥中,如不能妥善处理会引起生态健康风险。研究了零价铁还原、芬顿氧化及其组合技术对染料企业剩余污泥中AOX(可吸附有机... 详细信息

染料废水中含有大量难生物降解的卤代有机物合成中间体,合成卤代有机物在废水的生物处理过程中容易被吸附到剩余污泥中,如不能妥善处理会引起生态健康风险。研究了零价铁还原、芬顿氧化及其组合技术对染料企业剩余污泥中AOX(可吸附有机卤代物)的去除效果,优化了处理条件,解析了去除机理。结果表明,铁粉投加量为5 g·L^(-1),厌氧反应30 d时,零价铁还原对污泥中AOX降解率仅为24.7%;Fe2+投加量0.059 mol·L^(-1),H2O_2投加量0.89 mol·L^(-1),芬顿氧化1.5 h时,污泥中AOX去除率提高至73.7%;投加2 g·L^(-1)的铁粉,还原30 d后再进行芬顿反应,则污泥中AOX去除率可达到90.3%。GC-MS分析结果表明,污泥中的主要AOX物质为2,6-二氯-4-硝基苯胺,该物质经过零价铁还原与芬顿氧化组合工艺处理后,比直接芬顿氧化能得到更有效的去除。

关键词：零价铁芬顿活性污泥可吸附有机卤代物(AOX) 染料废水

Analysis of vibration response characteristics of subway station and superstructure with hard combination

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 271-281页

作者： Jia Jinglong xu Weiping Liu xu Wei Yong Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSchool of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Intelligent Geotechnics and Tunnelling Chengdu 610031China China Railway Eryuan Chongqing Survey and Design Institute Co.Ltd. Chongqing 400023China

The vibration response and noise caused by subway trains can affect the safety and comfort of *** study the dynamic response characteristics of subway stations and superstructures under train loads with a hard combination,a numerical model is developed in this *** indoor model test verified the accuracy of the numerical *** influence laws of different hard combinations,train operating speeds and modes were studied and evaluated *** results show that the frequency corresponding to the peak vibration acceleration level of each floor of the superstructure property is concentrated at 10–20 *** vibration response decreases in the high-frequency parts and increases in the lowfrequency parts with increasing distance from the ***,the factors,such as train operating speed,operating mode,and hard combination type,will affect the vibration of the *** vibration response under the reversible operation of the train is greater than that of the unidirectional *** operating speed of the train is proportional to its vibration *** vibration amplification area appears between the middle and the top of the superstructure at a higher train *** vibration acceleration level will exceed the limit value of relevant regulations,and vibration-damping measures are *** the scope of application,this study provides some suggestions for constructing subway stations and superstructures.

关键词： subway station superstructure vibration response hard combination