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Sorption enhanced catalytic CF4 hydrolysis with a three-stage catalyst-adsorbent reactor

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Frontiers of Chemical Science and Engineering 2017年第4期11卷 537-544页

作者： Jae-Yun Han Chang-Hyun Kim Boreum Lee Sung-Chan Nam Ho-Young Jung Hankwon Lim Kwan-Young Lee Shin-Kun Ryi . Advanced Materials and Devices Laboratory Korea Institute of Energy Research (KIER) Daejeon 34129 Korea.. Department of Advanced Materials and Chemical Engineering Catholic University of Daegu Gyeongbuk 38430 Korea.. Department of Environment and Energy Engineering Chonnam National University Gwangju 61186 Korea.. Department of Chemical and Biological Engineering Korea University Seoul 136-701 Korea

In this study, we developed a three-stage catalyst-adsorbent reactor for the catalytic hydrolysis of CF4. Each stage is composed of a catalyst bed followed by an adsorbent bed using Ca（OH）2 to remove HF. The three stages are connected in series to enhance the hydrolysis of CF4 and eliminate a scrubber to dissolve HF in water at the same time. With a 10 wt-% Ce/AlaO3 catalyst prepared by the incipient wetness method using boehmite and a granular calcium hydroxide as an adsorbent, the CF4 conversion in our proposed reactor was 7%-23% higher than that in a conventional single-bed catalytic reactor in the temperature range of 923-1023 K. In addition, experimental and numerical simulation （Aspen HYSYS） results showed a reasonable trend of increased CF4 conversion with the adsorbent added and these results can be used as a useful design guideline for our newly proposed multistage reactor system.

关键词： pfcs catalytic hydrolysis calcium hydro-xide sorption enhanced process simulation

Study on Solid Self-Lubricating Material for Plasma Facing Components in EAST

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Plasma Science and Technology 2010年第6期12卷 738-742页

作者：谢韩宋云涛姚达毛王廷梅杨丽君 Institute of Plasma Physics Chinese Academy of Sciences Institute of Chemical Physics Chinese Academy of Sciences

In this study, the friction performance of self-lubricating material with the counterpart steel ball-plate rubbing was investigated in vacuum conditions and the thermal distortion of the heat sink sample was tested. The analysis and test results show that the self-lubricating ma- terial has excellent anti-friction properties in high vacuum condition and can decrease the thermal stress and avoid damage to the pfcs during physical experiments.

关键词： tokamak pfcs self-lubricating material

Evaluation of perfluorinated compounds in seven wastewater treatment plants in Beijing urban areas

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Science China Chemistry 2011年第3期54卷 552-558页

作者： PAN YuanYuan SHI YaLi WANG JieMing CAI YaQi State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The presence of perfluorinated compounds(pfcs)in seven major wastewater treatment plants(WWTPs)in Beijing was investigated in the current study.We detected nine pfcs in all the wastewater and sludge samples.Perfluorooctane acid(PFOA)is the dominant pfcs in influents and effluents,while perfluorooctane sulfonate(PFOS)is the major contaminant in sludge.The highest PFC concentration was found in plants at Qinghe and Jiuxianqiao WWTP,while the lowest was found at Fangzhuang WWTP.The total values of PFC range from 2.88 to 176 ng/L in influents,from 5.48 to 498 ng/L in effluents,and from 1.21 to 32.0 ng/g(dry wt)in sludge.The fact that effluents usually contain higher levels of pfcs than influents suggests that additional pfcs are produced during the wastewater treatment processes.However,PFOS decreases in effluents than in influents in 62%of the water samples.This may be due to the adsorption and removal of the sludge during the active process.Perfluoroalkyl carboxylates(PFCAs)were found significantly correlated with each other in the effluents,which may indicate their similar sources or the existence of their potential precursors in the wastewater or treatment processes.The mass flows of PFC discharges into WWTPs are 0.4–51.4 mg/day,and the mass flows of pfcs in effluents exceed those in influents by 127%.Domestic and commercial wastewaters are suggested to be the major sources of PFC pollution in WWTPs in Beijing.

关键词：污水处理厂全氟化合物北京城区 pfcs 评价污水处理过程全氟辛烷质量流量

Ion-Beam Surface Modification of Strut Dowel Used in ITER PF Support

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Plasma Science and Technology 2013年第3期15卷 303-306页

作者：罗蓉蓉李鹏远韩石磊孙振超潘传杰沈丽茹金凡亚 Southwestern Institute of Physics

In this paper, surface modification of the strut dowel used in ITER PF support is reported. Different ions （nitrogen/titanium） with different doses are implanted into the surface of strut dowel. The result of Auger Electron Spectroscopy （AES） indicates that nitrogen can be implanted more deeply than titanium under the implantation condition of 60 kV accelerating voltage and a dose of 8×10^17/cm2 nitrogen. Surface Micro Hardness （SMH） and wear resistance are improved remarkably. Further SEM observation shows that there are no obvious scratches and damages after wear test.

关键词： ITER pfcs dowel ion-beam implantation

中国部分地表水体中5种全氟化合物的暴露特征与生态风险

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水生态学杂志 2023年第5期44卷 133-141页

作者：黄洁慧郭文景于晓宁李冰王向华江苏环保产业技术研究院股份公司江苏南京210019 江苏省废水无害化处理与资源化再生利用工程技术研究中心江苏南京210019 江苏省农业科学院农业资源与环境研究所江苏南京210014

评估地表水体中全氟化合物(pfcs)对水生生物的潜在生态风险水平,为我国当前部分水系地表水体中pfcs的污染现状与风险管理提供科学依据。系统总结和分析中国部分地表水体中pfcs的暴露特征,并基于可利用的慢性毒性数据,采用概率生态风险... 详细信息

评估地表水体中全氟化合物(pfcs)对水生生物的潜在生态风险水平,为我国当前部分水系地表水体中pfcs的污染现状与风险管理提供科学依据。系统总结和分析中国部分地表水体中pfcs的暴露特征,并基于可利用的慢性毒性数据,采用概率生态风险评估法中的安全阈值法(MOS_(10))评价水体中5种pfcs(PFOA、PFNA、PFDA、PFDoA和PFOS)对水生生物的生态风险以及pfcs混合物对水生生物的联合生态风险。结果表明:在5种pfcs中,PFOA的浓度范围最大,为ND~772 ng/L,其暴露浓度累积概率分布曲线上50%、75%和95%对应的暴露浓度分别为6.99、26.01和188.80 ng/L,远高于累积概率对应暴露浓度为第二的PFOS;生态风险结果表明PFOA、PFNA、PFDA、PFDoA和PFOS的MOS_(10)均小于1,且暴露浓度超过影响5%水生生物的概率分别为0、3.31%、0、1.00%和0,说明5种pfcs对水生生物的生态风险较小;此外,利用总等效浓度概念推导pfcs混合物的联合生态风险时,计算得出的MOS_(10)也小于1,且总等效暴露浓度超过影响5%水生生物的概率为5.42%,说明目前pfcs的地表水暴露对水生生物的生态风险属于可接受水平。

关键词：地表水体 pfcs 风险评估安全阈值

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纺织品防水防油剂的历史、现状和发展方向

印染 2022年第5期48卷 82-89,93页

作者：涂伟文福可新材料(上海)有限公司上海201619

纺织品防水防油剂的商品化应用有近100多年的历史。文章介绍了含氟防水防油剂基础理论,包括表面张力、结构、加工方式、单体和乳液制造方法等,回顾了纺织品防水防油剂的发展历程,详细阐述了PFOA和PFHxA环保规制的最新动向,并提出了对防... 详细信息

纺织品防水防油剂的商品化应用有近100多年的历史。文章介绍了含氟防水防油剂基础理论,包括表面张力、结构、加工方式、单体和乳液制造方法等,回顾了纺织品防水防油剂的发展历程,详细阐述了PFOA和PFHxA环保规制的最新动向,并提出了对防水防油剂未来发展方向的见解。

关键词：防水防油剂含氟聚合物 PFOA PFHxA pfcs PFAS 无氟防水剂

Oxygen Therapeutics :Current Issues and New Challenges

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生物医学工程学杂志 2005年第S1期22卷 31-32页

作者： P. MENU C. BOURA C. GAUCHER J-F STOLTZ Research Group of Cell and Tissue Engineering LEMTA-UMR CNRS 7563 Faculté de Médecine 54505 Vandoeuvre-lès-Nancy FranceResearch Group of Cell and Tissue Engineering LEMTA-UMR CNRS 7563 Faculté de Médecine 54505 Vandoeuvre-lès-Nancy FranceResearch Group of Cell and Tissue Engineering LEMTA-UMR CNRS 7563 Faculté de Médecine 54505 Vandoeuvre-lès-Nancy FranceResearch Group of Cell and Tissue Engineering LEMTA-UMR CNRS 7563 Faculté de Médecine 54505 Vandoeuvre-lès-Nancy France

应用HYDRUS-1D模型模拟分析pfcs在土壤中的迁移特征

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农业环境科学学报 2018年第10期37卷 2175-2182页

作者：邰托娅郑跃军王金生中国地质环境监测院北京100081 北京师范大学水科学研究院北京100875

为探明全氟化合物(pfcs)在土壤中的迁移转化规律,为pfcs地下水污染防治提供依据,以全氟丁酸(PFBA)、全氟己酸(PFHxA)、全氟庚酸(PFHpA)、全氟辛酸(PFOA)、全氟壬酸(PFNA)和全氟辛基磺酸(PFOS)等6种pfcs作为研究对象,在室内设置一维土柱... 详细信息

为探明全氟化合物(pfcs)在土壤中的迁移转化规律,为pfcs地下水污染防治提供依据,以全氟丁酸(PFBA)、全氟己酸(PFHxA)、全氟庚酸(PFHpA)、全氟辛酸(PFOA)、全氟壬酸(PFNA)和全氟辛基磺酸(PFOS)等6种pfcs作为研究对象,在室内设置一维土柱实验模拟pfcs在土壤中的迁移过程,采用Hydrus-1D模型建立土壤水流和溶质运移数值模型,对pfcs在土柱中的迁移过程进行模拟,将模拟结果同实验结果进行比较,模型模拟值与实验实测值吻合得较好。采用单因素局部扰动分析方法,分别对HYDRUS-1D模型中入渗水量、土壤容重、纵向弥散度和pfcs在土壤介质中的吸附系数等参数进行扰动,并与参数原值结果进行比较,计算敏感系数,结果表明入渗水量、土壤容重和吸附系数是影响pfcs在土壤中迁移的主要因素。

关键词： pfcs HYDRUS-1D模型土壤迁移

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无氟防水剂的发展现状

印染助剂 2022年第8期39卷 14-20页

作者：涂伟文江斌福可新材料(上海)有限公司上海201619

绿色和平和ZDHC去毒行动的开展使纺织行业开始进行一场去pfcs的行动。介绍无氟防水剂的背景由来、品牌动向、传统无氟防水剂的类型、新型无氟防水剂的现状,同时提出了无氟防水剂存在的主要问题及原因。

关键词： pfcs PFAS 无氟防水剂