检索结果-南通市图书馆

Activation mechanisms on potassium hydroxide enhanced microstructures development of coke powder

Chinese Journal of Chemical Engineering 2020年第1期28卷 299-306页

作者： Xiaojing Chen Huirong Zhang Yanxia Guo Yan Cao Fangqin Cheng State Environmental Protection Key Laboratory on Efficient Resource-utilization Techniques of CoalWaste Institute of Resources and Environmental EngineeringShanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related WastesShanxi UniversityTaiyuan 030006China Institute for Combustion Science and Environmental Technology(ICSET) Western Kentucky University(WKU)Bowling GreenKY 42101United States

Coke powder is expected to be an excellent raw material to produce activated carbon because of its high carbon content. Potassium hydroxide(KOH), as an effective activation agent, was reported to be effective in activating coke powder. However, the microstructures development in the coke powder and its mechanisms when KOH was applied were still unclear. In this study, effects of KOH on the microstructure activation of coke powder were investigated using the surface area and pore structure analyzer, scanning electron microscope(SEM) and thermogravimetry-differential scanning calorimetry-mass spectrometry(TG-DSC-MS), etc. Results revealed that the addition KOH at its lower ratio(mass ratios of KOH and coke powder in a range of 0.5 and 1) decreased the specific surface area and average lateral sizes, but sharply increased of the specific surface area to 132 m^2·g^-1 and 355 m^2·g^-1 and decreased of the space size of aromatic crystallites upon the further increase of the KOH addition amounts(ratios of KOH and coke powder in a range of 3 and 7), generating a number of new micropores and mesopores. The mechanisms study implied surface reactions between KOH and aliphatic hydrocarbon side chain and other carbon functional groups of the coke powder to destruct aromatic crystallites in one dimension and broaden pores at lower KOH addition. In the activation process, KOH was decomposed to be more active components, which can be rapidly destruct the aromatic layers in spatial scope to form developed porous carbon structures within coke powder at higher KOH addition.

关键词： Activated carbon Coke powder Activation Structure Potassium hydroxide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation of NiCoFe-hydroxide/polyaniline composite for enhanced-performance supercapacitors

引用

Journal of Materials Science & Technology 2019年第8期35卷 1691-1699页

作者： Lu Liu Xi Hu Hong-Yan Zeng Mo-Yu Yi Shi-Gen Shen Sheng Xu Xi Cao Jin-Ze Du College of Chemical Engineering Xiangtan University

Ternary NiCoFe layer hydroxides with different Ni/Co/Fe molar ratios were prepared using simple urea *** finely tuning Ni/Co/Fe molar ratio,the optimized hydroxide(LDH(2.0)),a Ni/Co/Fe molar ratio of 2.0/1.0/1.0,provided high specific capacitance(408 F g^-1at 2.0 A g^-1)and good stability(90.9%retention over 1000 cycles)due to maximum crystallinity(91.35%crystallinity)and specific surface area(160 m^2g^-1).In order to further improve the electrochemical performances,the LDH(2.0)was made into a composite(LDH/PANI)with polyaniline(PANI)via in situ polymerization of aniline *** LDH/PANI composite had a much higher specific capacitance(717 F g^-1at 2.0 A g^-1)compared with the LDH(2.0),and a significant improvement of cycleability(84.7%retention over 1000 cycles).The results indicated that the LDH/PANI had a synergistic effect of both components due to the complementary properties,which guaranteed a good electric contact and consequently increased the specific *** provided a new approach for designing organic-inorganic composite materials with potential application in supercapacitors.

关键词： NiCoFe hydroxide Polyaniline Composite Supercapacitors

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Novel synthesis of aluminum hydroxide gel-coated nano zero-valent iron and studies of its activity in flocculation-enhanced removal of tetracycline

引用

Journal of Environmental Sciences 2020年第3期32卷 194-205页

作者： Xiangyu Wang Binbin Zhang Jun Ma Ping Ning Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Environment Harbin Institute of TechnologyHarbin 150090China

A newly designed aluminum hydroxide gel-coated nanoscale zero-valent iron(AHG@NZVI)with enhanced activity and dispersibility of NZVI was successfully *** AHG@NZVI composite was synthesized via control of the surface AHG ***@NZVI-1,AHG@NZVI-2 and AHG@NZVI-3 were prepared under centrifugal mixing speeds of 1000,2000 and 4000 r/min,*** activity of AHG@NZVI was evaluated by its tetracycline(TC) removal *** effects of AHG content,pH value,reaction temperature,and presence of competitive anions on TC removal were *** could be removed by both adsorption and chemical reduction on AHG@NZVI-2(centrifugal speed 2000 r/min) in a short time with high removal efficiency(≥98.1%) at the optimal *** excellent performance can be attributed to a synergistic interaction between aluminum hydroxide gel and NZVI:(1) AHG could enhance the stability and dispersity of NZVI;(2) aluminum hydroxide gel could absorb a certain amount of TC and Fe^2+/Fe^3+,which facilitated the mass transfer of TC onto the NZVI surface,resulting in acceleration of the reduction rate of TC by the AHG@NZVI composite;and(3) AHG-Fe^2+/Fe^3+could absorb a certain amount of TC by *** kinetics of TC removal by AHG@NZVI composite was found to follow a two-parameter pseudo-first-order *** presence of competitive anions slightly inhibited the activity of AHG@NZVI systems for TC ***,this study provides a promising alternative material and environmental pollution management option for antibiotic wastewater treatment.

关键词： Nanoscale zerovalent iron Aluminum hydroxide gel Synergistic effect Tetracycline Flocculation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

EFFECT OF ELECTROLESS PLATING COBALT UPON CHARACTERISTICS OF NICKEL hydroxide ELECTRODEFORRECHARGEABLEALKALINEBATTERIES

引用

中国有色金属学会会刊：英文版 1998年第4期8卷 135-141页

作者： Wang, XY Zhang, YS Yan, J Yuan, HT Song, DY Nankai Univ Inst New Energy Mat Chem Tianjin 300071 Peoples R China

ＩＮＴＲＯＤＵＣＴＩＯＮＮｉｃｋｅｌｈｙｄｒｏｘｉｄｅｅｌｅｃｔｒｏｄｅｓｈａｖｅｂｅｅｎｗｉｄｅｌｙｕｓｅｄａｓｐｏｓｉｔｉｖｅｅｌｅｃｔｒｏｄｅｉｎＮｉＣｄ，ＮｉＨ２ａｎｄＮｉＭＨｓｅｃｏｎｄａｒｙｂａｔ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＮｉｃｋｅｌｈｙｄｒｏｘｉｄｅｅｌｅｃｔｒｏｄｅｓｈａｖｅｂｅｅｎｗｉｄｅｌｙｕｓｅｄａｓｐｏｓｉｔｉｖｅｅｌｅｃｔｒｏｄｅｉｎＮｉＣｄ，ＮｉＨ２ａｎｄＮｉＭＨｓｅｃｏｎｄａｒｙｂａｔｅｒｉｅｓ．Ｉｍｐｒｏｖｅｍｅｎｔ...

关键词： nickel hydroxide electrode electroless plating cobalt electrode performance electrochemical impedance conductivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ordering and disordering of in situ grown MgAl-layered double hydroxide and its effect on the structural and corrosion resistance properties

引用

International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1570-1577页

作者： Muhammad Ahsan Iqbal Michele Fedel Department of Industrial Engineering University of Trento

A MgAl-layered double hydroxide(MgAl-LDH)protective film was developed on AA6082 substrates via the in situ hydrothermal growth method to obtain a distinct cauliflower-like LDH structure,and coated substrates were further heat-treated in air at temperatures from 100 to 250℃ to further improve the corrosion resistance of MgAl-LDH by taking advantage of the LDH memory effect;also,the effect of calcination on MgAl-LDH structural stability and the corresponding corrosion resistance properties were *** structural characterization of uncalcined and calcined LDH films were examined using scanning electron microscopy,energy-dispersive spectroscopy,X-ray diffraction,thermogravimetric analysis,differential scanning calorimetry,and Fourier transform infrared *** corresponding corrosion protection efficiency of the developed coating was studied through potentiodynamic polarization experiments and by electrochemical impedance *** with uncalcined MgAl-LDH,the calcined film showed a relatively lower corrosion current density and a higher impedance value,especially after heat treatment at 250℃.The findings demonstrate that calcination strongly affects the oriented growth of the LDH and causes an increase in the surface area and contraction of the basal spacing,which in turn caused a compact structure that substantially influenced the LDH corrosion resistance properties.

关键词： layered double hydroxide calcination in situ growth thin films corrosion protection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Corrosion formation and phase transformation of nickel-iron hydroxide nanosheets array for efficient water oxidation

引用

Nano Research 2021年第12期14卷 4528-4533页

作者： Lanqian Gong Huan Yang Hongming Wang Ruijuan Qi Junlei Wang Shenghua Chen Bo You Zehua Dong Hongfang Liu Bao Yu Xia Key laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service FailureWuhan National Laboratory for OptoelectronicsSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan430074China Institute for Advanced Study Nanchang UniversityNanchang330000China Department of Information Science and Technology East China Normal UniversityShanghai200240China

Designing earth-abundant electrocatalysts with high performance towards water oxidation is highly decisive for the sustainable energy technologies. This study develops a facile natural corrosion approach to fabricate nickel-iron hydroxides for water oxidation. The resulted electrode demonstrates an outstanding activity and stability with an overpotential of 275 mV to deliver 10 mA·cm^(−2). Experimental and theoretical results suggest the corrosion-induced formation of hydroxides and their transformation to oxyhydroxides would account for this excellent performance. This work not only provides an interesting corrosion approach for the fabrication of excellent water oxidation electrode, but also bridges traditional corrosion engineering and novel materials fabrication, which would offer some insights in the innovative principles for nanomaterials and energy technologies.

关键词： water oxidation electrocatalyst corrosion hydroxide phase transformation

来源：

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

Corrosion resistance of nanostructured magnesium hydroxide coating on magnesium alloy AZ31: influence of EDTA

引用

Rare Metals 2019年第6期38卷 520-531页

作者： Xiao-Li Fan Yuan-Fang Huo Chang-Yang Li M.Bobby Kannan Xiao-Bo Chen Shao-Kang Guan Rong-Chang Zeng Quan-Li Ma College of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Biomaterials and Engineering Materials(BEM)Laboratory College of ScienceTechnology and EngineeringJames Cook UniversityTownsville 4811Australia School of Engineering RMIT UniversityCarltonVIC 3053Australia School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China Department of Resources and Civil Engineering Shandong University of Science and TechnologyTaian 271019China

A hexagonal nanosheet Mg(OH)2 coating was prepared through a one-step hydrothermal method using LiOH solution as mineralizer and then modified by ethylenediaminetetraacetic acid(EDTA) to minimize the rapid corrosion of AZ31 Mg *** performance of the coating was evaluated using electrochemical technique,hydrogen evolution measurements, nanoscratch test,Fourier-transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) patterns and field-emission scanning electron microscopy(FESEM).The results suggested that the corrosion rate of bare AZ31 Mg alloys was significantly reduced by one and two orders of magnitude through the protection from Mg(OH)2 coating and modification with EDTA(i.e., EDTA-Mg(OH)2 coating), *** micrographs indicated that the modification in EDTA elicits to the formation of an EDTA-Mg(OH)2 composite with a thickness as twice as that of as-prepared Mg(OH)2 *** tests revealed strong adhesion between the composite or Mg(OH)2 coating and the *** study of formation and corrosion mechanisms of the coatings manifested that Mg(OH)2 was first formed near the intermetallic compound AlMn particles and gradually covered the entire surface, wherein the AlMn particles played an important role in the coating growth *** it also proved that EDTA accelerated the formation of Mg(OH)2.

关键词： Corrosion resistance Magnesium alloy Magnesium hydroxide EDTA Intermetallic compound

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Selective removal of heavy metal ions in aqueous solutions by sulfide-selector intercalated layered double hydroxide adsorbent

引用

Journal of Materials Science & Technology 2019年第9期35卷 1809-1816页

作者： Jing Wang Liang Zhang Tianshu Zhang Ting Du Tao Li Tianli Yue Zhonghong Li Jianlong Wang College of Food Science and Engineering Northwest A&F UniversityYangling 712100China Shaanxi Institute for Food and Drug Control Xi'an 710065China

Remaining largely under-appreciated, a majority of metal ion sorbents are limited in their target selectivity. In this work, a 3D sulfide intercalated NiFe-layered double hydroxide (NFL-S) hierarchical sorbent has been synthesized for selective heavy metal removal. The intercalation of sulfurated groups in the interlayer of the layered double hydroxide (LDH) nanosheets endows NFL-S as a selective heavy metal ion filter;the selectivity of NFL-S for heavy metals is in the order of Pb^2+> Cu^2+≥ Zn^2+> Cd^2+> Mn^2+, and NFL-S has high kd values for Pb2+(~10^6 mL/g) and Cu2+(~10^5 mL/g). Scanning electron microscopy. X-ray photoelectron spectroscopy and powder X-ray diffraction were used to analyze the composition of the as-prepared nanoadsorbent. The selective adsorption behavior was systematically studied using batch experiments, and the performance was evaluated through kinetic and isotherm studies. Moreover, the adsorption mechanism of heavy metals by NFL-S through surface complexation was also investigated, which shows great potential for water decontamination.

关键词： Layered double hydroxide nanosheets Sulfide Selective adsorption Heavy metal ions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhanced phosphate removal using zirconium hydroxide encapsulated in quaternized cellulose

引用

Journal of Environmental Sciences 2020年第3期32卷 102-112页

作者： Shuoxun Dong Qinghua Ji Yili Wang Huijuan Liu Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China

Zirconium-based materials are efficient adsorbent for aqueous phosphate ***,current zirconium-based materials still show unsatisfied performance on adsorption capacity and ***,we demonstrate a zirconium hydroxide encapsulated in quaternized cellulose(QC-Zr) for the selective phosphate *** hydroxide nanoparticles were simultaneously generated in situ with the QC framework and firmly anchored in the three-dimensional(3D) cross-linked cellulose *** maximum P adsorption capacity of QC-Zr was 83.6 mg P/***,the QC-Zr shows high P adsorption performance in a wide pH range,generally due to the electrostatic effects of quaternized *** enhanced adsorption of P was also achieved in the presence of competing anions(including Cl^-,NO3^-,SO4^2-,SO4^4-) and humic acid(HA) even at a molar ratio up to 20 *** column adsorption capacity of QC-Zr reached 4000 bed volumes(BV) at EBCT=0.5 min as the P concentration decreased from 2.5 to 0.5 mg/*** study revealed that both-N^+(CH3)3 groups and zirconium hydroxide were involved in phosphate adsorption via electrostatic interactions between -N^+(CH3)3 and phosphate,and the formation of zirconium hydrogen phosphate(Zr(HPO4)x).The 31 P nuclear magnetic resonance(NMR) study implied that P surface-precipitated and inner-sphere complexed with zirconium hydroxide at a ratio of 3:1.

关键词： Adsorption Phosphate removal Zirconium hydroxide aerogel Quaternized cellulose

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Layered double hydroxide nanosheets via solvothermal delamination

引用

Journal of Energy Chemistry 2019年第8期28卷 88-94,I0004页

作者： Katarina Cermelj Kanittika Ruengkajorn Jean-Charles Buffet Dermot O’Hare Chemistry Research Laboratory Department of Chemistry University of Oxford

A new solvothermal post-synthesis treatment for preparing high aspect ratio magnesium aluminium layered double hydroxides(Mg Al–LDHs) has been developed. Treating laurate-intercalated Mg Al–LDHs in pure ethanol in an autoclave for 48 h at 150 °C was found to produce delaminated MgA l–LDH nanosheets with a thickness of ~2.6 nm and an aspect ratio of ~105. It is proposed that the high pressure solvothermal process promotes the insertion of ethanol molecules into the LDH interlayer space, thereby facilitating delamination. This new post-synthesis treatment provides the opportunity for a facile, large scale route to highly delaminated high aspect ratio LDHs, which might be of interest towards novel nanomaterials for energy conversion and storage.

关键词： Layered double hydroxide Hydrophobicity Aspect ratio Solvothermal treatment Delamination

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：