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Chinese Journal of Chemical Engineering 2020年第8期28卷 2137-2141页

作者： Ruizhi Cui key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China

Using isothermal dissolution method,the phase equilibrium relationship in quaternary system LiCl+NaCl+KCl+H2O and the ternary subsystem LiCl+NaCl+H2O at 288.15 K were *** phase diagram of two systems was *** phase diagram of LiCl+NaCl+H2O system contains two solid phase regions of crystallization LiCl·2H2O and *** the phase diagram of LiCl+NaCl+KCl+H2O system,there are three crystallization regions:LiCl·2H2O,NaCl and KCl *** this paper,the solubilities of phase equilibria in two systems were calculated by Pitzer's model at 288.15 *** predicted phase diagrams generally agree with the experimental phase diagrams.

关键词： Underground brine Phase diagram Pitzer model Solubility prediction Lithium chloride

Selective recovery of lithium from simulated brine using different organic synergist

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Chinese Journal of Chemical Engineering 2019年第2期27卷 335-340页

作者： Huifang Li Lijuan Li Xiaowu Peng Lianmin Ji Wu Li key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences key laboratory of salt lake resources Chemistry of Qinghai Province University of Chinese Academy of Sciences Qinghai University

The organic synergists, including Octanol, ethyl acetate(EA), butyl acetate(BA), methyl isobutyl ketone(MIBK),diisobutyl ketone(DIBK), N,N-bis(2-ethylhexyl) acetamide(N523) and 8-hydroxylquiolate, were added to the TBP–FeCl_3 extraction system to extract lithium from brine. The effects of concentration of organic synergist and total organic extractant, molar ratio of Fe/Li, phase ratio, counter-current extraction and the acidity of stripping agent on lithium extraction were investigated to optimize the extraction conditions. Under the optimize conditions, the results of counter-current extraction showed the mixed extraction system was the preponderance on the lithium extraction. Especially the separation of lithium in organic phase and aqueous phase and the separation mass ratio of Mg/Li increased greatly. An extraction mechanism was proposed based on the analysis of FT-IR spectra and Raman spectra.

关键词： Organic synergist Lithium extraction Mixed extraction system Mechanism

Crystallization,Mechanical,Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker

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Chinese Journal of Polymer Science 2017年第5期35卷 659-671页

作者： Li Dang Xue-ying Nai Xin Liu Dong-hai Zhu Ya-ping Dong 李武 key laboratory of salt lake resources Chemistry Qinghai Institute of Salt LakesChinese Academy of Sciences key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences University of Chinese Academy of Sciences

Polypropylene （PP） composites containing magnesium oxysulfate whisker （MOSw） or lauric acid （LA） modified MOSw （LAMOSw） were prepared via melt mixing in a torque rheometer. The heterogeneous nucleating effect of LAMOSw was clearly observed in polarized light microscopy （PLM） pictures with the presence of an abundance of small spherulites. MOSw exhibited no nucleation effect and formed a few spherulites with large size. Compared with PP/MOSw composites, PP/LAMOSw exhibited better impact strength, tensile strength and nominal strain at break, ascribing to three possible reasons：（i） more β-crystal PP formed, （ii） better dispersity of LAMOSw in PP matrix and （iii） the plasticizing effect of LA. The results of dynamic mechanical thermal analysis （DMTA） indicated that brittleness of the PP matrix at low temperature was improved by the addition of LAMOSw, while the interracial interactions between MOSw and PP matrix were actually weakened by LA, as evidenced by the higher tan8 values over the entire range of test temperatures. In terms of the rheological properties of the composites, both the η＊ and G＇ at low frequencies increase with the addition of MOSw or LAMOSw, indicating that the PP matrix was transformed from liquid-like to solid-like. However, a network of whiskers did not form because no plateau was found in the G＇ at low frequencies. With low filler content, LAMOSw produced a stronger solid-like behavior than MOSw mainly due to the better dispersion of the LAMOSw in PP matrix. However, for highly-filled composites, the η＊ of PP/LAMOSw at low frequencies was smaller than that of PP/MOSw composite, since the particle- particle contact effect played a major role.

关键词： PP/MOSw composites Crystallization Thermal properties Mechanical properties Rheological properties

The process and mechanism for cesium and rubidium extraction with saponified 4-tert-butyl-2-(a-methylbenzyl) phenol

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Chinese Journal of Chemical Engineering 2022年第6期35卷 31-39页

作者： Dengke Pang Zhihong Zhang Yongquan Zhou Zhenhai Fu Quan Li Yongming Zhang Guangguo Wang Zhuanfang Jing key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China University of Chinese Academy of Sciences Beijing 100049China

Cesium(Cs)and rubidium(Rb)separation from brine is an important and application-oriented topic.4-tert-butyl-2-(a-methylbenzyl)phenol(t-BAMBP)has been used for Cs and Rb ***,the traditional extraction technology is base and acid *** the present work,an innovative process for Cs and Rb extraction with t-BAMBP is developed,which consists of saponification,extraction,scrubbing and *** infrared spectrum and electrostatic potential analysis indicate the hydrogen of phenolic hydroxyl is dissociated from t-BAMBP during saponification and the oxygen of phenolic hydroxyl is the binding site for alkali metal *** organic phase shows an excellent extraction effect for Cs^(+)and Rb^(+).The extraction reaches equilibrium in 5 min,with 99.5%Cs^(+)and 46.7%Rb^(+)are loaded into the organic phase in the single-stage *** method indicates the structure of the extraction complex is MOR·3ROH(M=Cs^(+),Rb^(+),K^(+)),where the electrostatic attraction between M^(+)and the oxygen of phenolic hydroxyl is dominant,and the cation–p interaction has a significant effect *** extraction complex of MOR·3ROH dissociates in the acid environment while scrubbing and stripping is *** Cs^(+)and Rb^(+)are separated from the mixture phase,the proton H bonds to the phenolic hydroxyl group,and the extractant is regenerated.

关键词： t-BAMBP Optimization Separation Solvent extraction Cesium Rubidium

Syntheses, Structures, and Luminescent Properties of the ZnⅡ and CdⅡ 1-D Chain Polymers Assembled by Salicylhydroxamic Acid

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Chinese Journal of Structural Chemistry 2015年第9期34卷 1371-1378页

作者：高丹丹高倩陈砚美李亚红李武 key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of Sciences College of Chemistry Chemical Engineering and Materials ScienceSoochow University

TWO complexes of compositions [Zn（H2shi）（CHsCOO）]. （1） and [Cd（H2shih（H20）]. （2）（H3shi = salicylhydroxamic acid） have been prepared under solvothermal conditions. They are characterized by X-ray single-crystal diffraction, IR and elemental analysis. The crystal of 1 belongs to the tetragonal system, space group I41/a with a = 18.972（3）, b = 18.972（3）, c = 10.938（2） A, V= 3937.1（I） A3, C9H9NOsZn, Mr - 276.54, Z = 16, Dc = 1.866 g/cm3,μ = 2.500 mm-1, F（000） = 2240, the final R = 0.0425 and wR = 0.123. The crystal of 2 belongs to the monoclinic system, space group P2/c with a = 16.647（3）, b = 6.4577（I）, c = 6.5623（I） A, V = 702.4（2） A3, C14H4Cd2N2OT, Mr = 434.68, Z = 2, Dc = 2.055 g/cm3,μ = 1.599 mm-1, F（000） = 432, the final R = 0.0211 and wR = 0.0761. They both possess I-D polymeric chain structures. The luminescent properties of complexes I and 2 have been investigated.

关键词： hydroxamic acids zinc complex cadmium complex 1-D polymeric

Boron separation by adsorption and flotation with Mg-Al-LDHs and SDBS from aqueous solution

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Chinese Journal of Chemical Engineering 2023年第9期61卷 192-200页

作者： Chun Bai Huifang Zhang Qinglong Luo Xiushen Ye Haining Liu Quan Li Jun Li Zhijian Wu School of Chemical Engineering Qinghai UniversityXining 810016China key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China key laboratory of salt lake resources Chemistry of Qinghai Province Xining 810008China

Layered double hydroxides(LDHs)have been shown to be effective adsorbents for ***,solid-liquid separation is still a problem when separating boron from industrial radioactive waste *** this research,three types of Mg-Al-LDHs including Mg-Al-LDH(NO_(3)^(-)),Mg-Al-LDH(Cl^(-))and Mg-Al-LDH(SO_(4)^(2-))were applied to adsorb boron,and moreover sodium dodecylbenzenesulfonate(SDBS)was used to float the LDH particles from aqueous solution after boron *** results showed that 60 min was sufficient for the equilibrium adsorption of the three *** boron adsorption capacity of three LDHs was determined as follows:Mg-Al-LDH(NO_(3)^(-))>Mg-Al-LDH(Cl^(-))>Mg-Al-LDH(SO_(4)^(2-)),and was 2.0,0.98 and 0.2 mmol·g^(-1),each ranging from 0 to 80 mmol·L^(-1)with the initial boron *** efficiency of boron removal by Mg-Al-LDH(NO_(3)^(-))and SDBS can reach up to 89.7%.Furthermore,the boron flotation mechanism of SDBS and LDHs has been studied,since SDBS as a flotation agent can react with LDHs and penetrate into the interlayer of LDHs in addition to electrostatic ***,LDHs in solution can be floated onto the foam layer to be separated from the solution,and the clarified solution was *** method is simple and promising for boron removal from aqueous solution.

关键词： Boron Separation Adsorption Flotation Layered double hydroxide Sodium dodecyl benzene sulfonate

Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China

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Geoscience Frontiers 2019年第1期10卷 253-262页

作者： Yongsheng Du Qishun Fan Donglin Gao Haicheng Wei Fashou Shan Binkai Li Xiangru Zhang Qin Yuan Zhanjie Qin Qianhui Ren Xueming Teng key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences key laboratory of salt lake Geology and Environment of Qinghai Province University of Chinese Academy of Sciences Tianjin Center China Geological Survey

In this study, nineteen brine samples from the Qarhan salt lake(QSL) in western China were collected and analyzed for boron(B) and chlorine(Cl) concentrations, total dissolved solids(TDS), pH values and stable B isotopic compositions. The B concentrations and δ^(11) B values of brines in the QSL range from 51.6 mg/L to138.4 mg/L, and from +9.32& to +13.08&, respectively. By comparison of B concentrations and TDS of brines in QSL with evaporation paths of brackish water, we found that B enrichment of brines primarily results from strong evaporation and concentration of Qarhan lake water. Combining with comparisons of B concentrations, TDS, p H values and δ^(11) B values of brines, previously elemental ratios(K/Cl, Mg/Cl, Ca/Cl, B/Cl) and δ^(11) B values of halite from a sediment core(ISL1 A), we observe good correlations between B concentrations and TDS, TDS and pH values, pH and δ^(11) B values of brines, which demonstrate that higher B concentrations and more positive δ^(11) B values of halite indicate higher salinity of the Qarhan paleolake water as well as drier paleoclimatic conditions. Based on this interpretation of the δ^(11) B values of halite in core ISL1 A, higher salinity of the Qarhan paleolake occurred during two intervals, around 46-34 ka and26-9 ka, which are almost coincident with the upper and lower halite-dominated salt layers in core ISL1 A,drier climate phases documented from the δ^(18) O record of carbonate in core ISL1 A and the paleomoisture record in monsoonal central Asia, and a higher solar insolation at 30°N. These results demonstrate that the δ^(11) B values of halite in the arid Qaidam Basin could be regarded as a new proxy for reconstructing the salinity record of paleolake water as well as paleoclimate conditions.

关键词： B isotope compositions Brine Chemical concentrations Qarhan salt lake Western China Salinity of paleolake water

The salt Attack Performance of Magnesium Oxychloride Cement Exposure to Three Kinds of Brines

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 155-166页

作者：黄青 LI Ying CHANG Chenggong WEN Jing DONG Jinmei ZHENG Weixin A Danchun LIU Pan DONG Fei ZHOU Yuan 肖学英 key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXinning 810008China key laboratory of salt lake resources Chemistry of Qinghai Province Xining 810008China University of Chinese Academy of Sciences Beijing 100049China

salt attack performance of magnesium oxychloride cement(MOC) in brine was investigated from the viewpoints of strength development and strength coefficient. Microstructure was studied using quantitative X-ray diffraction(QXRD), thermogravimetry(TG) and scanning electron microscopy(SEM). The results show that MOC mortars have outstanding salt attack performance after aging brine and raw brine immersion. The salt attack coefficients of MOC mortars are higher than 0.8, which is qualified for application in saline soil and salt lake area. The reason is that salt brine solution enters into the voids of MOC and plays a role of toughening and strengthening in the MOC.

关键词： magnesium oxychloride cement salt attack performance saline soil salt lake area

In-situ embedded ultrafine Bi_(12)O_(17)Br_(2)nanotubes in MOF-derived hierarchical porous carbon for enhanced photocatalytic CO_(2)conversion to CO

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Journal of Materials Science & Technology 2024年第4期171卷 47-53页

作者： Xing Sun Mengxia Ji Yi Zhang Qingzeng Xing Zihan Liu Nianhua Liu Emmanuel Nkudede Huaming Li Sheng Yin Jiexiang Xia School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Provincial Key Laboratory of Resources Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 81008China

Increasing the utilization efficiency of photogenerated electrons is highly recognized as one of the ef-ficient approaches to boost the photocatalytic CO_(2)conversion ***,ZIF-67-derived porous carbon(PC)material was employed for the construction of PC@ultrafine Bi_(12)O_(17)Br_(2)nanotubes(PC@BOB NTs)composites through a facile solvothermal synthesis in order to optimize the use of excited elec-trons in the BOB *** characterization results revealed that the introduction of PC material achieved a faster charge separation rate in the PC@BOB composites,ensuring more photogener-ated electrons participate in the CO_(2)adsorption and activation ***,the pore structures of ZIF-67-derived PC material provided abundant confined spaces for the enrichment of CO_(2)***-ter 5 h of Xenon lamp irradiation,PC@BOB composites exhibited obviously increased photocatalytic CO_(2)reduction activity in the pure *** the addition amount of PC was 5 wt%,the PC@BOB-2 com-posite showed the highest CO evolution rate of 359.70μmol/g,which was 2.95 times higher than that of the pure BOB *** work provides some independent insights into the applications of Metal-Organic Framework(MOF)-derived hierarchical porous structures to strengthen the CO_(2)enrichment,as well as the excited charge utilization efficiency,thus achieving a high solar-to-fuel conversion efficiency.

关键词： Bi_(12)O_(17)Br_(2)nanotubes Hierarchical porous structure CO_(2)enrichment Charge separation CO_(2)photoreduction

Preparation of Fe3O4-octadecyltrichlorosilane for Removal of Methyl Orange and Methylene Blue:Influence of p H and Ionic Strength on Competitive Adsorption

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1413-1419页

作者：胡耀强 QUAN Chaoming GUO Min 叶秀深吴志坚 key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChineseAcademy of SciencesXining 810008China College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China key laboratory of salt lake resources Chemistry of Qinghai Province Xining 810008China

Fe3O4-octadecyltrichlorosilane（Fe3O4-OTS）was synthesized and used to remove dyes in a competitive ***3O4-OTS was prepared by slow hydrolysis of OTS in cyclohexane on the surface of Fe3O4obtained through coprecipitation *** electron microscope（SEM）,energy dispersive spectrometer（EDS）,and contact angle analyzer（CA）were used to analyze the properties of *** orange（MO）and methylene blue（MB）were selected as model molecules to study the influence mechanism of p H and ionic strength on competitive *** results of EDS and CA indicated that Fe3O4 was modified successfully with OTS on the *** appeared and carbon content increased obviously on the surface of *** angle of adsorbent increased from 0~o to 107~o after being modified by ***3O4-OTS showed good separation for MO and MB in competitive system,which has potential to separate dyes in *** factor（β~OB）changed from 18.724 to 0.017,when p H changed from 7 to 12,revealing that MO and MB could be separated almost thoroughly by Fe3O4-OTS.p H could change the surface charge of Fe3O4-OTS and structure of dyes,and thus change the interactions of competitive system *** though hydrophobic interaction was enhanced,ionic strength reduced the difference of electrostatic interaction between dyes and *** it is unfavorable to separate dyes with opposite charges when ionic strength *** findings may provide theoretical guidances to separate two-component dye pollutants.

关键词： Fe3O4-Octadecyltrichlorosilane competitive adsorption mechanism pH ionic strength dye