检索结果-南通市图书馆

Practical performance and its efficiency of arsenic removal from groundwater using Fe-Mn binary oxide

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第1期22卷 1-6页

作者： fangfang chang Jiuhui Qu Ruiping Liu Xu Zhao Pengju Lei State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Graduate School Chinese Academy of Sciences Beijing 100039 China

A treatment unit packed by granular adsorbent of Fe-Mn binary oxide incorporated into diatomite （FMBO（1：1）-diatomite） was studied to remove arsenic from anaerobic groundwater without any pre-treatment or post-treatment. The raw anaerobic groundwater containing 35-45 μg/L of arsenic was collected from suburb of Beijing. Arsenic（Ⅲ） constituted roughly 60%-80% of the total arsenic content. Approximately 7,000 bed volumes （ratio of effluent volume to adsorbent volume） treated water with arsenic concentration below 10 μg/L were produced in the operation period of four months. The regeneration of FMBO（1：1）-diatomite had been operated for 15 times. In the first stage, the regeneration process significantly improved the adsorption capacity of FMBO（1：1 ）-diatomite. With increased loading amount of Fe-Mn binary oxide, the adsorption capacity for arsenic decreased 20%-40%. Iron and manganese in anaerobic groundwater were oxidized and adsorptive filtrated by FMBO（1 ： 1）-diatomite efficiently. The final concentrations of iron and manganese in effluents were nearly zero. The continued safe performance of the treatment units proved that adsorbent FMBO（1：1）- diatomite had high oxidation ability and exhibited strong adsorptive filtration.

关键词： arsenic groundwater adsorption filtration Fe(Ⅱ) Mn(Ⅱ)

Migration of manganese and iron during the adsorptionregeneration cycles for arsenic removal

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2011年第4期5卷 512-518页

作者： fangfang chang Jiuhui QU Xu ZHAO Wenjun LIU Kun WU School of Environment Tsinghua UniversityBeijing 100084China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

Fe-Mn binary oxide incorporated into porous diatomite(FMBO-diatomite)was prepared in situ and regenerated in a fixed-bed column for arsenite[As(III)]and arsenate[As(V)]*** consecutive adsorption cycles were operated under the following conditions:Initial arsenic concentration of 0.1 mg·L^(-1),empty bed contact time of 5 min,and pH *** 3000,3300,3800,and 4500 bed volumes of eligible effluent(arsenic concentration≤0.01 mg·L^(-1))were obtained in four As(III)adsorption cycles;while about 2000,2300,2500,and 3100 bed volumes of eligible effluent were obtained in four As(V)adsorption *** dissection results of FMBOdiatomite fixed-bed exhibited that small amounts of manganese and iron were transferred from the top of the fixed-bed to the bottom of the fixed-bed during As(III)removal *** to the extremely low concentration of iron(<0.01 mg·L^(-1)),the fluctuation concentration of Mn2+in effluent of the As(III)removal column was in a range of 0.01-0.08 mg·L^(-1).The release of manganese suggested that manganese oxides played an important role in As(III)*** with the US EPA toxicity characteristic leaching procedure(TCLP),the leaching risk of As(III)on exhausted FMBO-diatomite was lower than that of As(V).

关键词： arsenic adsorption filtration regeneration fixed-bed

Controlled Growth of Pt–Au Alloy Nanowires and Their Performance for Formic Acid Electrooxidation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第7期32卷 639-645页

作者： Yu Han Yuejun Ouyang Zhihui Xie Jinri Chen fangfang chang Gang Yu State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China College of Chemistry and Materials Engineering Huaihua University Huaihua 418000 China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical Engineering China West Normal University Nanchong 637002 China

Pt-Au alloy nanowires have been controllably electrodeposited on microelectrodes by applying an al- ternating current and were used as the electrocatalyst for formic acid oxidation. The frequency and voltage of the alternating current and the electrolyte composition were adjusted to precisely control the mor- phologies, alloying structures and composition. The characteristics of Pt-Au alloy nanowires were analyzed by scanning electron microscopy, X-ray diffraction and transmission electron spectroscopy. Electrocatalytic performance of formic acid oxidation at Pt-Au alloy nanowires electrode was investigated by cyclic voltammetry and chronoamperometry. The results showed that the Pt-Au alloy nanowires possessed highly- crystalline morphologies, the controllable bimetallic composition and single-phase alloy structures, which mainly grow in the 〈111〉 crystal orientation. The electrocatalytic activity of formic acid oxidation strongly depended on the bimetallic Pt/Au composition. The PtjsAu6s alloy nanowires displayed superior electrocatalytic performance and high stability toward the electrooxidation of formic acid in acidic so- lution, owing to the ensemble effect of the Pt and Au components. These findings provided insights into the design of the Pt-Au bimetallic nanomaterials as electrocatalvsts for formic acid oxidation.

关键词： Pt-Au alloyNanowiresPhase structureFormic aciclElectrooxidation

放疗剂量对颈段食管鳞癌根治性同步放化疗预后的影响

在线全文

学校读者我要写书评

暂无评论

中华全科医学 2024年第10期22卷 1671-1674,1695页

作者：刘佳崔珍孙巧玉常芳芳蚌埠医科大学第一附属医院放疗科安徽蚌埠233004

目的颈段食管鳞癌(CEC)的根治性放疗剂量存在争议,本研究对接受根治性同步放化疗的CEC患者的疗效进行分析,以期为CEC的放疗剂量提供临床参考。方法回顾性分析2013年1月—2021年12月蚌埠医科大学第一附属医院放疗科收治的89例接受调强放... 详细信息

目的颈段食管鳞癌(CEC)的根治性放疗剂量存在争议,本研究对接受根治性同步放化疗的CEC患者的疗效进行分析,以期为CEC的放疗剂量提供临床参考。方法回顾性分析2013年1月—2021年12月蚌埠医科大学第一附属医院放疗科收治的89例接受调强放疗的颈段食管鳞癌患者资料,根据放疗剂量分成2组,分别为低剂量组(EQD2Gy≤60 Gy,26例)及高剂量组(EQD2Gy>60 Gy,63例)。化疗方案包括以铂类为基础的双药联合和单纯口服替吉奥胶囊。采用Kaplan-Meier法计算局部区域控制(LRC)、无进展生存(PFS)、总生存(OS),log-rank法进行差异性检验及单因素分析,Cox模型分析独立预后因素。结果随访至2022年12月底,随访率为100%,中位随访时间为100个月,1、3、5年LRC率分别为76.1%、37.9%、22.4%,PFS率分别为67.4%、30.0%、16.2%,OS率分别为85.4%、47.1%、29.6%。单因素分析显示T分期、N分期、TNM分期和放疗剂量是OS、PFS、LRC的影响因素,多因素分析显示放疗剂量是颈段食管鳞癌0S、PFS、LRC的独立预后因素(P60 Gy显示出更好的生存获益,放疗剂量是OS、PFS、LRC的独立预后因素。

关键词：食管癌根治性放化疗预后放疗剂量

310例结肠癌患者组织MutS同系物和绒毛蛋白的表达与临床病理特征的相关性

在线全文

学校读者我要写书评

暂无评论

四川大学学报（医学版） 2024年第5期55卷 1247-1253页

作者：常方方胡晓舒温一阳李平皇甫赟张凤娟谭静曹雪霞河南医学高等专科学校内科教研室郑州451191 郑州人民医院病理科郑州450003 河南省人民医院肿瘤中心郑州450003

目的探究结肠癌患者错配修复蛋白MutS同系物(MutS homolog,MSH)2、MSH6、绒毛蛋白(villin)表达及与病理特征的关系。方法选取我院2017年1月–2021年9月经病理确诊的310例结肠癌患者,采用免疫组化法检测MSH2、MSH6和villin表达,分析MSH2... 详细信息

目的探究结肠癌患者错配修复蛋白MutS同系物(MutS homolog,MSH)2、MSH6、绒毛蛋白(villin)表达及与病理特征的关系。方法选取我院2017年1月–2021年9月经病理确诊的310例结肠癌患者,采用免疫组化法检测MSH2、MSH6和villin表达,分析MSH2、MSH6、villin表达与结肠癌患者临床病理特征的相关性。应用多因素logistic回归分析MSH2、MSH6、villin表达与结肠癌临床病理参数的相关性,用Kaplan-Meier生存曲线比较不同蛋白表达情况的结肠癌患者2年生存率。结果患者癌组织中的MSH2、MSH6和villin蛋白阴性表达率分别为8.71%(27/310)、9.35%(29/310)和46.13%(143/310);癌旁组织中的3种蛋白阴性表达率分别为3.23%(10/310)、4.19%(13/310)和9.68%(30/310),3种蛋白在癌组织中的阴性率均高于癌旁组织(P<0.05)。回归分析显示:癌组织中MSH2及MSH6的表达与结肠癌患者年龄、肿瘤病灶位置、肿瘤分化程度和淋巴结转移相关(P<0.05);癌组织中villin表达与结肠癌患者肿瘤浸润深度、淋巴结转移、远处转移、临床分期相关(P<0.05)。MSH2、MSH6阴性表达患者2年生存率分别为51.85%、44.83%,低于MSH2、MSH6阳性表达的患者(79.51%、80.43%,P<0.05);癌组织中villin阴性表达的患者2年生存率为67.83%,低于villin阳性表达患者(85.03%,P<0.05)。癌组织中的MSH2、MSH6、villin均阴性表达(简称“三阴表达”)的患者有13例(4.1%),其2年生存率为30.77%(4/13),低于不符合三阴表达的结肠癌患者[79.12%(235/297),P<0.05]。结论MSH2、MSH6、villin表达与结肠癌患者临床病理特征相关,检测这3种蛋白表达可能有利于辅助临床进行结肠癌诊治及预后评估。

关键词：结肠癌错配修复蛋白MutS同系物2 错配修复蛋白MutS同系物6 绒毛蛋白病理特征

Copper‑Based Catalysts for Electrochemical Carbon Dioxide Reduction to Multicarbon Products

在线全文

学校读者我要写书评

暂无评论

Electrochemical Energy Reviews 2022年第3期5卷 178-212页

作者： fangfang chang Meiling Xiao Ruifang Miao Yongpeng Liu Mengyun Ren Zhichao Jia Dandan Han Yang Yuan Zhengyu Bai Lin Yang Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007HenanChina Department of Chemical Engineering University of WaterlooWaterlooON N2L 3G1Canada

Electrochemical conversion of carbon dioxide into fuel and chemicals with added value represents an appealing approach to reduce the greenhouse effect and realize a carbon-neutral cycle,which has great potential in mitigating global warming and effectively storing renewable *** electrochemical CO_(2) reduction reaction(CO_(2)RR)usually involves multiproton coupling and multielectron transfer in aqueous electrolytes to form multicarbon products(C_(2+) products),but it competes with the hydrogen evolution reaction(HER),which results in intrinsically sluggish kinetics and a complex reaction mechanism and places higher requirements on the design of *** this review,the advantages of electrochemical CO_(2) reduction are briefly introduced,and then,different categories of Cu-based catalysts,including monometallic Cu catalysts,bimetallic catalysts,metal-organic frameworks(MOFs)along with MOF-derived catalysts and other catalysts,are summarized in terms of their synthesis method and conversion of CO_(2) to C2+products in aqueous *** catalytic mechanisms of these catalysts are subsequently discussed for rational design of more efficient *** response to the mechanisms,several material strategies to enhance the catalytic behaviors are proposed,including surface facet engineering,interface engineering,utilization of strong metal-support interactions and surface *** on the above strategies,challenges and prospects are proposed for the future development of CO_(2)RR catalysts for industrial applications.

关键词： C_(2)products Carbon dioxide Nanocatalysts Electrochemical reduction Mechanism

Incorporation of flexible ionic polymers into a Lewis acid-functionalized mesoporous silica for cooperative conversion of CO2 to cyclic carbonates

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2019年第12期40卷 1874-1883页

作者： Ruqun Guan Xiaoming Zhang fangfang chang Nan Xue Hengquan Yang School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan 030006ShanxiChina

A rational integration of multiple reactive centers into a combined unit to facilitate their cooperative effects is a smart approach for accelerating the catalytic ***,to achieve this goal,linear imidazolium-based ionic polymers were confined into the nanopores of mesoporous silica nanospheres anchored with homogeneously distributed zinc *** to the flexible character and the reinforced cooperative effects of the ionic liquid(nucleophile)and zinc species(Lewis acid)in the confined mesoporous structure,the resultant composite exhibited dramatically improved catalytic performance in the cycloaddition of CO2 with epoxides to form cyclic *** was in contrast to that observed for the individual catalytic ***,such a solid catalyst could be easily recovered and reused four times without a significant loss of activity.

关键词： Mesoporous silica Flexible ionic polymer Cooperative effects CO2 utilization Heterogeneous catalysis

Rational Design of dodecahedral MnCo2O4.5 hollowed-out nanocages as efficient bifunctional electrocatalysts for oxygen reduction and evolution

在线全文

学校读者我要写书评

暂无评论

Rational Design of dodecahedral MnCo2O4.5 hollowed-out nanoc...

Edge-enriched N, S co-doped hierarchical porous carbon for oxygen reduction reaction

中国化学会第二十次全国电化学大会

作者： Zhengyu Bai fangfang chang Li Fang Lin Yang School of Chemistry and Chemical Engineering Henan Normal University

Efficient bifunctional electrocatalysts are in demand to increase kinetics of oxygen reduction and evolution reactions（ORR and OER） for rechargeable zinc-air batteries. In this work, dodecahedral MnCo2O4.5 hollowed-out nanocages are synthesized using a seed-mediated coordination chemistry of metal-orgranic frameworks. The hollowed-out MnCo2O4.5 nanocages used as bifunctional oxygen electrocatalysts exhibit high catalytic acivity and excellent stability for both ORR and OER in alkaline media,

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第2期34卷 349-354页

作者： fangfang chang Panpan Su Utsab Guharoy Runping Ye Yanfu Ma Huajun Zheng Yi Jia Jian Liu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Department of Applied Chemistry and Zhejiang Carbon Neutral Innovation Institute Zhejiang University of TechnologyHangzhou 310032China DICP-Surrey Joint Centre for Future Materials Department of Chemical and Process EngineeringUniversity of SurreyGuildfordSurrey GU27XHUnited Kingdom

The development of carbon materials with high electrochemical performance for next-generation energy device is emerging, especially N, S co-doped carbon materials have sparked intensive attention. However,the exploration of N, S co-doped carbon with well-defined active sites and hierarchical porous structures are still limited. In this study, we prepared a series of edge-enriched N, S co-doped carbon materials through pyrolysis of thiourea(TU) encapsulated in zeolitic imidazolate frameworks(TU@ZIF) composites,which delivered very good oxygen reduction reaction(ORR) performance in alkaline medium with onset potential of 0.94 V vs. reversible hydrogen electrode(RHE), good stability and methanol tolerance. Density functional theory(DFT) calculations suggested that carbon atoms adjacent to N and S are probable active sites for ORR intermediates in edge-enriched N, S co-doped carbon materials because higher electron density can enhance O_(2)adsorption, lower formation barriers of intermediates, improving the ORR performance comparing to intact N, S co-doped carbon materials. This study might provide a new pathway for improving ORR activity by the integration engineering of edge sites, and electronic structure of heteroatom doped carbon electrocatalysts.

关键词： Porosity engineering N S co-doped carbon materials Hierarchical porous carbon Edge-enriched carbon Oxygen reduction reaction DFT calculation