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Metastable Phase Equilibrium in the Reciprocal Quaternary System LiCl＋MgCl2＋Li2SO4＋MgSO4＋H2O at 348.15 K and 0.1 MPa

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Chemical Research in Chinese Universities 2018年第5期34卷 798-802页

作者： YU Xiaoping WANG Qin GUO Yafei deng tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials Science Tianjin University of Science and Technology Tianjin 300457 P. R. China College of Chemistry and A laterials Science Northwest University Xi 'an 710127 P. R. China

The metastable solubilities and the physicochemical properties including density and pH of the reciprocal quaternary system（LiCl＋MgCl2＋Li2SO4＋MgSO4＋H2O） at 348.15 K and 0.1 MPa were determined using the isother- mal evaporation method. The dry-salt diagram and water-phase diagram were plotted based on the experimental data. There are five invariant points, eleven tmivariant curves, and seven crystallization zones corresponding to hexahy- drite, tetrahydrite, kieserite, bischofite, lithium sulfate monohydrate, lithium chloride monohydrate and lithium car- nallite. Comparison between the stable and metastable diagrams at 348.15 K indicates that the metastable phenome- non of magnesium sulfate is obvious, and the crystallization regions of hexahydrite and tetrahydrite disappear in the stable phase diagram. A comparison of the metastable dry-salt phase diagrams at 308.15, 323.15 and 348.15 K shows that with the increasing of temperatttre the epsomite crystallization zone disappears from the dry-salt phase diagranl of 303.15 K, and a new kieserite crystallization zone is presented at 348.15 K. The density and pH in the metastable equilibrium solution present regular change with the increasing of Janecke index J（2Li＋）, and the calculated densities using the empirical equation agree well with the experimental values.

关键词： Phase equilibrium Phase diagram Solubility Quaternary system Lithium salt

Solid and Liquid Metastable Phase Equilibria in the Aqueous Quaternary System Li＋, Mg2＋//SO42-, Borate-H2O at 273.15 K

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Chemical Research in Chinese Universities 2017年第4期33卷 655-659页

作者： MENG Lingzong GUO Yafei LI Dan deng tianlong Tianfin Key Laboratory of Marine Resou~es and Chemistry College of Chemical Engineering and Material Sciences Tianjin University of Science and Technology Tianjin 300457 P. R. China School of Chemistry and Chemical Engineering Linyi University Linyi 276005 P. R. China CAS Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Aeademy of Sciences Xining 810008 P. R. China

The metastable phase equilibria of the Li＋, Mg2＋//SO42-, borate-H2O system at 273.15 K were studied using isothermal evaporation method. The dry-salt phase diagram, water-phase diagram and the physicochemical property diagrams of the system were plotted with the metastable solubility values and physicochemical properties corresponding to density, refractive index, pH value and conductivity. The dry-salt diagram was composed of four crys- tallizing zones[lithium sulfate hydrate（Li2SO4·H2O）, epsomite（MgSO4·7H2O）, lithium metaborate octahy- drate（LiBO2.8H2O）, and hungchaoite（MgB4O7·9H2O）], five univariant curves and two invariant points （Li2SO4·H2O＋MgSO4·7H2O＋MgB4O7·9H2O and Li2SO4·H2O＋LiBO2-8H2O＋MgB4O7·9H20）. Li2B4O7 converted in- to LiBO2 in solution. Comparing the metastable phase diagram at 273.15 K and stable phase diagram at 298.15 K for the system, the crystallized area of Li2SO4·H2O and MgSO4·7H2O became large, whereas, the other phase regions became small. The J（H2O） changes regularly with increasing J（SO42-）, and the physicochemical properties change regularly with the concentration of B4O72- increasing.

关键词： Metastable phase equilibrium Phase diagram Solubility Lithium metaborate octahydrate Hungchaoite

Constructing porous ZnFC-PA/PSF composite spheres for highly efficient Cs^(+) removal

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Journal of Environmental Sciences 2024年第9期143卷 126-137页

作者： Senjian Han Chao Gao Wenfeng Yan Yafei Guo Shiqiang Wang tianlong deng College of Marine and Environmental Sciences Tianjin University of Science and TechnologyTianjin 300457China Key Laboratory of Marine Resource Chemistry and Food Technology Ministry of EducationTianjin 300457China

Radioisotope leaking from nuclear waste has become an intractable problem due to its gamma radiation and strong water *** this work,a novel porous ZnFC-PA/PSF composite sphere was fabricated by immobilization of ferrocyanides modified zinc phytate into polysulfone(PSF)substrate for the treatment of Cs-contaminated *** maximum adsorption capacity of ZnFC-PA/PSF was 305.38 mg/g,and the removal efficiency of Cs+was reached 94.27%within 2 *** ZnFC-PA/PSF presented favorable stability with negligible dissolution loss of Zn^(2+)and Fe^(2+)(<2%).The ZnFC-PA/PSF achieved high-selectivity towards Cs+(K_(d)=2.24×10^(4)mL/g)even in actual geothermal *** adsorption mechanism was inferred to be the ion-exchange between Cs^(+)and K^(+).What’s more,ZnFC-PA/PSF worked well in the fixed-bed adsorption(E=91.92%),indicating the application potential for the hazardous Cs^(+)removal from wastewater.

关键词： Adsorption Cesium Metal ferrocyanide Composite adsorbent

Thermal Characteristics of Room Temperature Inorganic Phase Change System Containing Calcium Chloride

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Chemical Research in Chinese Universities 2015年第3期31卷 452-456页

作者： GAO Daolin GUO Yafei YU Xiaoping WANG Shiqiang deng tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and EngineeringTianjin University of Science and Technology Tianjin 300457 P.R.China

A novel inorganic calcium-based phase change material（PCM-Ca） consisted of 47.1%（mass fraction） water, 47.7% calcium chloride, 2% potassium nitrate, 2% potassium bromide and 1.2% strontium chloride with a solid-liquid phase change temperature of 21.4 ℃ was investigated systematically. Among the components of PCM-Ca, calcium chloride and water act as the latent heat storage materials, and potassium nitrate, potassium bromide and strontium chloride work as the modifier, thickener and nucleating agent, respectively. Thermochemical properties including melting point, latent heat, density and thermal conductivity of the PCM-Ca were measured experimentally. The experimental results indicate that the melting latent heat, thermal conductivity at the melting point and density at room temperature for the PCM-Ca are 203.3 kJ/kg, 1.3637 W·m-1·K-l and 1.55×103 kg/m3, respectively. Moreover, a thirty-run-cycling test showed that the PCM-Ca has a good thermal characteristic with no phase segregation or supercooling, and the maximum deviations of latent heat and phase change temperature are only 0.2% and 1.6%, respectively.

关键词： Phase change material Calcium chloride Latent heat Thermal conductivity

The science of saline lakes:the need for a multidisciplinary approach

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Journal of Oceanology and Limnology 2023年第4期41卷 1221-1225页

作者： Egor ZADEREEV Katia HUESO-KORTEKAAS tianlong deng Mianping ZHENG Institute of Biophysics Krasnoyarsk Research CenterSiberian Branch of Russian Academy of SciencesAkademgorodokKrasnoyarsk 660036Russia Siberian Federal University Krasnoyarsk 660041Russia Department of Mechanical Engineering ICAIUniversidad Pontificia ComillasAlberto Aguilera 25Madrid 28015Spain Key Laboratory of Marine Resource Chemistry and Food Technology(TUST) Ministry of EducationCollege of Marine and Environmental SciencesTianjin University of Science and TechnologyTianjin 300457China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China

Saline lakes are widespread on all *** 1979,an informal international association of salt lake researchers from a variety of disciplines has sponsored a series of triennial conferences to foster scientific exchange and our understanding of saline *** Society for Salt Lake Research(ISSLR,***)was founded in 1994 to establish effective liaison between persons interested in any aspect of inland saline waters,to encourage these interests,and to educate the public in the scientific use,management,and conservation of salt *** conferences are held *** conferences are usually hosted by a local University or research institution and provide an excellent opportunity for networking among globally dispe rsed researchers.

关键词： globally inland widespread

Antimony speciation at the sediment-water interface of the Poyang Lake: response to seasonal variation

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Journal of Oceanology and Limnology 2018年第6期36卷 1941-1949页

作者： YU Xiaoping GUO Yafei deng tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Science and Technology College of Chemistry and Materials Science Northwest University

In order to identify the effects of seasonal variation on the migration and transformation of antimony species at the sediment-water interface of the Poyang Lake, the largest fresh lake in China, a simulation study was carried out in the laboratory. Antimony species including antimonite Sb(III), antimonate Sb(V) and the fraction of organic forms(Sb-org) in overlying water at different temperatures were regularly measured during the simulation period. Different bound antimony forms in sediments were also determined along with the different antimony species in porewaters after the simulation terminated. The results indicated that temperature change during seasonal alternation plays an important role in the migration and transformation behavior of antimony at the sediment-water interface of the Poyang Lake. Antimony species both in porewaters and overlying water were sensitive to the variation of temperature, especially the Sb-org species. Antimony migrates from porewaters to the overlying water when the temperature decreases, and meanwhile the equilibrium between Sb(III) and Sb(V) in porewaters shifts toward Sb(V) when the temperature increases during seasonal alternation. Although temperature had less influence on the antimony species in sediments than in porewaters or in the overlying water, the average content of each antimony species in sediments increased with the decrease of temperature, suggesting that the decrease of temperature causes enrichment of antimony in the sediment.

关键词： geochemistry antimony species seasonal variation Poyang Lake

Silver-catalyzed bioleaching for raw low-grade copper sulphide ores

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Frontiers of Chemical Science and Engineering 2009年第3期3卷 250-254页

作者： tianlong deng Yafei GUO Mengxia LIAO Dongchan LI College of Materials Chemistry and Chemical EngineeringChengdu University of TechnologyChengdu 610059China Qinghai Institute of Salt Lakes Chinese Academy of SciencesXining 810008China

This research was conducted to investigate the biooxidation and copper dissolution from raw low-grade refractory copper sulphide ores located in the Xinjiang Autonomous Region of China using adapted Thiobacillus ferrooxidans *** order to accelerate the bioleach-ing rate,the adapted mixed bacteria and silver ion catalyst were tested in the leach columns at laboratory *** overall acid consumption was 4.3kg sulphuric acid per kg of dissolved copper and was linearly related to the percent copper *** calculated copper dissolution rates obey the Shrinking Core *** relative activation energy of the whole biooxidative leaching stages was calculated to be 48.58kJ/mol.

关键词： green process biohydrometallurgy bioleach-ing reaction kinetics sulphide ores

Simulation studies on metastable phase equilibria in the aqueous ternary systems (NaCl-MgCl_(2)-H_(2)O) and (KCl-MgCl_(2)-H_(2)O) at 308.15K

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Frontiers of Chemical Science and Engineering 2009年第2期3卷 172-175页

作者： tianlong deng Baojun ZHANG Dongchan LI Yafei GUO Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China College of Materials Chemistry and Chemical EngineeringChengdu University of TechnologyChengdu 610059China

The solubilities and densities of the aqueous metastable ternary systems(NaCl-MgCl_(2)-H_(2)O)and(KCl-MgCl_(2)-H_(2)O)at 308.15 K were determined by the isothermal evaporation *** the basis of the experimental results,the phase diagrams for those systems were *** was found that the former system belongs to the hydrate-I type with one invariant point of(NaCl+MgCl_(2)·6H_(2)O),two univariant curves,and two crystal-lization regions corresponding to halite(NaCl)and bischofite(MgCl_(2)·6H_(2)O);and the latter system belongs to the type of incongruent-double salts with two invariant points of(KCl+KCl·MgCl_(2)·6H_(2)O)and(MgCl_(2)·6H_(2)O+KCl·MgCl_(2)·6H_(2)O),three univariant curves,and three crystallization regions corresponding to potassium chlor-ide(KCl),carnallite(KCl·MgCl_(2)·6H_(2)O)and bischofite(MgCl_(2)·6H_(2).No solid solutions were found in both systems.

关键词： green chemistry solar pond technique simu-lation metastable phase equilibrium solubility

Seasonal variations of phosphorus species in the Tuohe River, China. Part Ⅰ. Sediments

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Journal of Oceanology and Limnology 2018年第6期36卷 1950-1961页

作者： XU Qing YU Xiaoping GUO Yafei deng tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Sciences and EngineeringTianjin 300457China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China Department of Chemistry and Biochemistry Laurentian UniversitySudburyOntarioP3E 2C6Canada

Sediment cores were collected at an upstream site(Jintang) and a downstream site(Neijiang) in summer and winter in the Tuohe River, which is one of the five largest tributaries of the Changjiang(Yangtze) River in China. A sequential leaching procedure was applied to determine the concentrations of the different forms of solid phosphorus, including exchangeable phosphorus(Exc-P) as well as phosphorus associated with iron oxides(Fe-P), with aluminum oxides(Al-P), with apatite(Ca-P) and with the residual fraction(Res-P), as correlated with water content and total organic carbon. The seasonal variations and the vertical distributions of phosphorus species in sediments at both sampling sites demonstrated that: 1) total phosphorus(TP) in summer and winter were ranged between 1 313–2 330, 1 491–2 228 mg/kg in Jintang and 543–2 128, 603–1 175 mg/kg in Neijiang, respectively. It can predicated the pollution of TP in Jintang is serious than that in Neijiang both in summer and winter; 2) total inorganic phosphorus(TIP) was the dominant form of TP; 3) Ca-P was the main chemical forms of TIP in the sediments. Based on the profiles in sediments and bio-available phosphorus data, it revealed that bio-available phosphorus(BAP) represented only a minor portion(0.61%–3.59%) of TP, and the vertical distribution of soluble reactive phosphorus(SRP) in corresponding porewaters was more abundant in the upper layer of the sediment, which suggests that BAP may be converted to non-bioavailable phosphorus in deeper layer of the sediment of this dynamic system.

关键词： phosphorus species vertical distribution seasonal variation Tuohe River