检索结果-南通市图书馆

Bio-leaching effects of Leptospirillum ferriphilum on the surface chemical properties of pyrite

2011国际粉体技术与应用论坛

作者： Qiang Li Wanzhong Yin Mingbao Liu Yingqiang Ma Ximei Luo Institute of Mining Technology Liaoning Technical University College of Resources and Civil Engineering Northeastern University

Lizardite was as the research mineral in the paper,and the surface properties of lizardite and magnesium in the surface properties of the solution and the the natural flotability of lizardite were *** surface of lizardite easily produced unsaturated groups,and lizardite in the slurry can be generated in the Mg,MgOH,HSiO,HSiO,HSiO ions and acid molecules and Mg（OH） precipitation,that result in the high PZC of lizardite,and the natural flotability of lizardite was poor in sodium oleate and DDA flotation system.

关键词： Lizardite Crystal chemistryre surface properties Flotation

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

Mining Science and Technology 2010年第2期20卷 286-291页

作者： GU, Guohua SU, Lijun CHEN, Minglian SUN, Xiaojun ZHOU, Hongbo school of mineral processing and bioengineering central south universitychangsha 410083china

Leptospirillum ferriphilum cultured using different energy sources(either soluble ferrous ion or pyrite) changed the surface properties of *** adsorption,zeta-potential,hydrophobicty,FT-IR spectra and surface morphology were *** of bacterial cells to the pyrite surface is a fast ***,the adsorption of cells grown in pyrite is greater than of cells grown in soluble ferrous *** Iso-Electric Point(IEP) of pyrite treated with *** approaches that of the cells *** contact angle of the pyrite surface was observed to decrease due to the surface formation of some hydrophilic substances during *** in pyrite surface properties after bacterial treatment support the idea that ferric ion plays an important role and that indirect bio-oxidation is the principal mechanism of pyrite bio-leaching.

关键词： Leptospirillum ferriphilum pyrite adsorption bio-leaching surface properties

Approaches to Improving Selectivity During Photoelectrochemical Transformation of Small Molecules

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2024年第2期30卷 167-177页

作者： Sipeng Yang Jie Yang Mengyu Duan Shirong Kang Shaohua He Chuncheng Chen Key Laboratory of Photochemistry CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100190China

Photoelectrochemical (PEC) small-molecule oxidation can selectively transform substrates into high-value-added fine chemicals and increase the rate of cathode hydrogen evolution. Nevertheless, achieving high-selectivity PEC oxidation of small molecules to produce specific products is a very challenging task. In general, selectivity can be improved by changing the surface catalyticsites of the photoanode and modulating the interfacial environments of the reactions. Herein, recent advances in approaches to improving selective PEC oxidation of small molecules are introduced. We first briefly discuss the basic concept and fundamentals of small-molecule PEC oxidation. The reported approaches to improving the performance of selective PEC oxidation of small molecules are highlighted from two aspects: (1) changing the surface properties of photoanodes by selecting suitable materials or modifying the photoanodes and (2) mediating the oxidation reactions using redox mediators. The PEC oxidation mechanism of these studies is emphasized. We also discuss the challenges in this research direction and offer a perspective on the further development of selective PEC-based small-molecule transformation.

关键词： Photoelectrocatalytic Small-molecule oxidation Improving selectivity surface properties Mediating

surface modification of wollastonite by the mechano-activated method and its properties

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 83-88页

作者： Hao Ding Shou-ci Lu Gao-xiang Du School of Materials Science and Technology China University of Geosciences Beijing 100083 China School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

surface modification of wollastonite particles using titanate as a modification agent incorporated by simultaneous wet ultra-fine grinding in a laboratory stirred mill was *** physical,physic-chemical and application properties of the modified wollastonite were measured and *** results showed that grinding intensity markedly influences the modification effect because of the mechano chemical *** hydrophilic surface of wollastonite was turned into a hydrophobic one after *** interaction between titanate and wollastonite under wet grinding circumstances was *** was suggested that physical adsorption and chemical adsorption of titanate coexisted on the wollastonite *** mechanical properties of polyethylene（PE） filled with the modified wollastonite powder were markedly improved.

关键词： silicate minerals modification surface properties ball milling fillers

A review of flotation and selective separation of pyrrhotite:A perspective from crystal structures

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2022年第4期32卷 847-863页

作者： Xiaoqin Tang Ye Chen School of Chemistry&Chemical Engineering Guangxi UniversityNanning 530004China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials Guangxi UniversityNanning 530004China

Pyrrhotite is an associated mineral that exists widely in sulfide ore. The presence of pyrrhotite will affect the recovery of platinum group minerals. Therefore, researchers have paid increasing attention to the flotation separation of pyrrhotite. Pyrrhotite superstructures owning different Fe/S ratios results in various crystal structures, corresponding to different physical, chemical and electronic properties, and consequently different flotation behavior. In the present paper, a comprehensive review is conducted to discuss the influence of crystal structures on the natural floatability, mineral-reagent interaction, surface oxidation and flotation electrochemistry of pyrrhotite. The selective flotation process of pyrrhotite from its associated minerals is also reviewed in this paper. It is hoped that this review can summarize the newly published research results combined with some representative results from the past, to provide a theoretical basis for the study of the flotation mechanism of pyrrhotite and provide a new direction for future research on pyrrhotite.

关键词： Pyrrhotite Flotation Crystal structures surface properties

Evaluation of activated sludge properties’changes in industrial-wastewater pre-treatment:role of residual aluminum hydrolyzed species with different polymerization degree

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第6期17卷 141-151页

作者： Ziqi Zhao Meng Li Wansong Huang Nuowei Guo Qian Zhang School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China Hubei Jianke International Construction Ltd.Co Wuhan 430070China Wuhan Hanyang Municipal Construction Group Co.Ltd. Wuhan 430000China Shenzhen Research Institute of Wuhan University of Technology Shenzhen 518000China

With the widespread introduction of pre-coagulation prior to the biological unit in various industrial wastewater treatments,it is noteworthy that long-term accumulation of residual coagulants has certains effect on both micro and macro characteristics of activated sludge(AS).In this study,the morphology distributions of residual aluminum salts(RAS)and their effects on the removal efficiency of AS were investigated under different PAC *** results showed that the dominance of medium polymeric RAS,formed under an appropriate PAC dose of 20 mg/L enhanced the hydrophobicity,flocculation,and sedimentation performances of AS,as well as the enzymatic activity in cells in the sludge system,improving the main pollutants removal efficiency of the treatment *** the species composition with monomer and dimer/high polymer RAS as the overwhelming parts under an over-dosed PAC concentration of 55 mg/L resulted in excessive secretion of EPS with loose flocs structure and conspicuous inhibition of cellular activity,leading to the deterioration of physico-chemical and biological properties of *** on these findings,this study can shed light on the role of the RAS hydrolyzed species distributions,closely relevant to Al dosage,in affecting the comprehensive properties of AS and provide a theoretical reference for coagulants dosage precise control in the pretreatment of industrial wastewater.

关键词： Coagulation/flocculation Hydroxyl-aluminum Hydrolysis reaction Reactor performance Activated sludge property surface properties

Au/TS-1 catalyst for propylene epoxidation with H_(2)and O_(2):Effect of surface property and morphology of TS-1 zeolite

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 6278-6289页

作者： Jialun Xu Zhihua Zhang Daiyi Yu Wei Du Nan Song Xuezhi Duan Xinggui Zhou State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

The catalytic performances over propylene epoxidation with H_(2)and O_(2)(HOPO process)are significantly affected by the properties(e.g.,surface properties,Ti coordination,morphology)of titanosilicate *** urea into zeolite synthesis is a simple and convenient method to modify these properties of titanosilicate *** pore-blocked titanium silicalite-1(TS-1,i.e.,TS-1-B)with the lower urea dosage possesses more defective structure and unsaturated coordinated Ti sites verified by 29Si nuclear magnetic resonance(NMR)and X-ray photoelectron spectroscopy(XPS)analysis,which results in a high initial activity and hydrogen efficiency;while the high surface acidity generated by these Ti species leads to a continuous decrease in the activity and the propylene oxide(PO)selectivity during the *** the amount of urea gradually increases,the TS-1-B samples present the reduced surface defects and defective and unsaturated Ti ***,TS-1-B-0.30U presents the weaker PO adsorption on PO-diffusion reflectance infrared Fourier transform spectra(DRIFTS),thus results in the high stable PO formation rate and selectivity over its Au ***,a flat-plate-like shape with a shorter thickness of 100 nm along the b-axis direction is observed on the urea-modified *** with the conventional ellipsoidal TS-1 with crystal sizes of 200 and 500 nm,the flat-plate-like TS-1-0.30U displays the less surface defects,unsaturated Ti species,the weaker Lewis acid,which is favorable for the desorption and intracrystalline diffusion of PO,thus reduces the occurrence of side reactions for the improved selectivity and *** work may provide a reference for developing titanium-containing materials with high activity and stability over HOPO reaction.

关键词： propylene epoxidation titanium silicalite-1(TS-1) surface properties Ti species morphological regulation diffusion

Engineering sulfur vacancies for boosting electrocatalytic reactions

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

中国化学快报:英文版 2023年第9期34卷 34-44页

作者： Xianxu Chu Yueyu Liao Lu Wang Junru Li Hui Xu Henan Key Laboratory of Biomolecular Recognition and Sensing College of Chemistry and Chemical EngineeringShangqiu Normal UniversityShangqiu 476000China Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation CenterChangzhou UniversityChangzhou 213164China

Transition metal sulfides are demonstrated to play an increasingly important role in boosting the deployment of ecofriendly electrocatalytic energy conversion *** is also widely recognized that the introduction of vacancies is now becoming an important and valid approach to promote the electrocatalytic *** this review,the significance of sulfur vacancies on the enhancement of catalytic performance via four main functionalities,including tuning the electronic structure,tailoring the active sites,improving the electrical conductivity,and regulating surface reconstruction,is comprehensively *** effective strategies for the sulfur vacancy engineering,such as plasma treatment,heteroatom doping,and chemical reduction are also comprehensively ***,recent achievements in sulfur vacancy fabrication on various hotspot electrocatalytic reactions are also systematically ***,a summary of the recent progress and challenges of this interesting field are organized,which hopes to guide the future development of more efficient metal sulfide electrocatalysts.

关键词： Sulfur vacancy Electrocatalytic reactions Functionalities surface properties Energy conversion

Response of MG63 Osteoblast Cells to surface Modification of Ti-6Al-4V Implant Alloy by Laser Interference Lithography

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2017年第3期14卷 448-458页

作者： Qi Liu Wenjun Li Liang Cao Jiajia Wang Yingmin Qu Xinyue Wang Rongxian Qiu Xu Di Zuobin Wang Bojian Liang International Research Centre for Nano Handling and Manufacturing of China Changchun University of Science and Technology Changchun 130022 China Department of Orthopaedic Surgery China-Japan Union Hospital of Jilin University Changchun 130033 China

The response of human osteoblast-like osteosarcoma cells （MG63） to surface modification of Ti-6Al-4V implant alloy was investigated by Laser Interference Lithography （LIL）. In this work, laser interference lithography was employed to fabricate the microstructures of grooves, dots and dimples onto the surfaces of Ti-6Al-4V samples. Two and three beam LIL systems were developed to carry out the experiments. The laser treatment resulted in the increases of the roughness and the contact angle of water on the implant alloy surfaces. The proliferation of osteoblasts was analyzed by MTT （3-（4,5-dirnethyl- 2-thiazolyl）-2,5-diphenyl-2-H-tetrazolium bromide） assay for the time periods of 4 hours, 2 days, 3 days, and 6 days. The MTT test results demonstrated that the laser treatment surfaces had a positive impact on the proliferation of os- teoblast cells after 24 hours. The alloy surface morphology and the morphological changes of MG63 cells cultured on the laser textured Ti-6Al-4V surface were observed by Scanning Electron Microscope （SEM）. The SEM results indicated that the os- teoblast cells were aligned on grooved surfaces and they were prolonged with the structures. Enzymatic detachment results showed that the 20 μm grooved structures provided the better cell adhesion to the textured Ti-6Al-4V surfaces.

关键词： Ti-6Al-4V implant alloy laser interference lithography surface modification surface properties cell-substrate interaction