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Effect of precipitation pH and coexisting magnesium ion on phosphate adsorption onto hydrous zirconium oxide

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Journal of Environmental Sciences 2019年第2期31卷 167-187页

作者： Jianwei Lin xingxing wang Yanhui Zhan College of Marine Ecology and Environment Shanghai Ocean University

To understand the effect of precipitation pH and coexisting Mg^(2+) on phosphate adsorption onto zirconium oxide(ZrO_2), ZrO_2 particles precipitated at pH 5.3, 7.1 and 10.5, i.e., ZrO_2(5.3), ZrO_2(7.1)and ZrO_2(10.5), respectively were prepared and characterized, then their adsorption performance and mechanism in the absence and presence of Mg^(2+) were comparatively investigated in this study. The results showed that the Elovich, pseudo-second-order and Langmuir isotherm models correlated with the experimental data well. The adsorption mechanism involved the complexation between phosphate and zirconium. Coexisting Mg^(2+) slightly inhibited the adsorption of phosphate on ZrO_2(5.3), including the adsorption capacity and rate, but coexisting Mg^(2+) greatly increased the adsorption capacity and rate for ZrO_2(7.1)and ZrO_2(10.5). The enhanced adsorption of phosphate on ZrO_2(7.1) and ZrO_2(10.5) in the presence of Mg^(2+) was mainly due to the formation of Mg^(2+)-HPO_4^(2-) ion pair(MgHPO_4~0) in the solution and then the adsorption of MgHPO_4~0 on the adsorbent surface, forming the phosphatebridged ternary complex Zr(OPO_3H)Mg. In the absence of Mg^(2+) , the maximum phosphate adsorption capacity at pH 7 calculated from the Langmuir isotherm model decreased in the order of ZrO 2(7.1)(67.3 mg/g) > ZrO_2(5.3)(53.6 mg/g) ≈ ZrO_2(10.5)(53.1 mg/g), but it followed the order of Zr O2(7.1)(97.0 mg/g) > ZrO_2(10.5)(79.7 mg/g) > ZrO_2(5.3)(51.3 mg/g) in the presence of Mg^(2+) . The results of this work suggest that ZrO_2(7.1) is more suitable for use as an adsorbent for the effective removal of phosphate from municipal wastewater than ZrO_2(5.3) and ZrO_2(10.5),because Mg^(2+) is generally present in this wastewater.

关键词： Hydrous zirconium oxide Different precipitation pH values Adsorption Phosphate Magnesium ion Effect

Some logarithmic Minkowski inequalities for nonsymmetric convex bodies

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Science China Mathematics 2017年第10期60卷 1857-1872页

作者： wang xingxing XU WenXue ZHOU JiaZu School of Mathematics and Statistics Southwest UniversityChongqing 400715China Southwest Guizhou Vocational College of Technology for Nationalities Kaili 556000China

We prove some analogs inequalities of the logarithmic Minkowski inequality for general nonsymmetric convex bodies. As applications of one of those inequalities, the p-affine isoperimetric inequality and some other ine... 详细信息

关键词： log-Minkowski inequality Minkowski inequality p-affine isoperimetric inequality dual log-Minkowski inequality

Untypical Electrochemical Corrosion Behavior of High-Nitrogen Austenitic Stainless Steel: Non-Pitting in Transpassivation

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Acta Metallurgica Sinica(English Letters) 2024年第10期37卷 1785-1792页

作者： Qisi wang Qingchuan wang xingxing wang Fan Liu Ke Yang Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Henan International Joint Laboratory of High-Efficiency Special Green Welding North China University of Water Resources and Electric PowerZhengzhou450045China

The transpassivation and pitting corrosion behavior of a high-nitrogen stainless steel(HNS),Fe18Cr15Mn3Mo0.92N,were systematically investigated by electrochemical analysis,morphology observation,and X-ray photoelectron spectroscopy surface *** was surprisingly found that no pitting corrosion occurred in the transpassivation region of *** electrochemical corrosion behavior is untypical for stainless steels,i.e.,the traditional critical pitting potential method was invalid for *** N and Cr enrichments in the transpassivation film on HNS were found extremely higher than those in the passivation *** N existed in the form of[CrN]complex,which could stabilize the above both ***,the corrosion product of N was detected as NH_(3) that exhibited an effective corrosion inhibition *** this basis,although the transition of Cr from 3-valent to 6-valent was confirmed,the transpassivation film on HNS still maintained it high stability and no pitting was found to ***,the real pitting resistance of HNS should be higher than the expected *** the stable transpassivation film played an important role in its untypical pitting corrosion resistance.

关键词： High nitrogen Stainless steel Passivation Transpassivation Pitting corrosion

Fast algorithm for viscous Cahn-Hilliard equation

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Frontiers of Mathematics in China 2022年第4期17卷 689-713页

作者： Danxia wang Yaqian LI xingxing wang Hongen JIA College of Mathematics Taiyuan University of TechnologyTaiyuan030024China

The main purpose of this paper is to solve the viscous Cahn-Hilliard equation via a fast algorithm based on the two time-mesh(TT-M)finite element(FE)method to ease the problem caused by strong *** TT-M FE algorithm includes the following main computing ***,a nonlinear FE method is applied on a coarse time-meshτ_(c).Here,the FE method is used for spatial discretization and the implicit second-orderθscheme(containing both implicit Crank-Nicolson and second-order backward difference)is used for temporal ***,based on the chosen initial iterative value,a linearized FE system on time fine mesh is solved,where some useful coarse numerical solutions are found by Lagrange’s interpolation *** analysis for both stability and a priori error estimates is made in *** examples are given to demonstrate the validity of the proposed *** algorithm is compared with the traditional Galerkin FE method and it is evident that our fast algorithm can save computational time.

关键词： Fast algorithm two time-mesh(TT-M)finite element(FE)method viscous Cahn-Hilliard equation stability CPU time

Opportunities for ionic liquid-based electrolytes in rechargeable lithium batteries

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Science China Chemistry 2023年第12期66卷 3443-3466页

作者： xingxing wang Letao Jin Wenfang Feng Zhibin Zhou Heng Zhang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education) School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Ionic liquids(ILs)have been deemed as promising electrolyte materials for building safer and highly-performing rechargeable lithium batteries,owing to their negligible volatility,low-flammability,and high thermal stability,*** profound structural designability of IL cations and anions allows relatively facile regulations of their key physical(e.g.,viscosities,and ionic conductivities)and electrochemical(e.g.,anodic,and cathodic stabilities)properties,and therefore fulfills the critical requirements stipulated by various battery *** this review,a historical overview on the development of ILs for nonaqueous electrolytes is provided,and the correlations between chemical structures and the basic properties of ILs are ***,the key achievements in the field of IL-based electrolytes are scrutinized,including liquid electrolytes,polymer electrolytes,and composite polymer *** on literature reports and our previous work in this field,possible strategies to improve the performance of IL-based electrolytes and their rechargeable batteries are *** present work not only provides the status quo in the development of IL-based electrolytes but also inspires the structural design of ILs for other kinds of rechargeable batteries(e.g.,sodium,potassium,zinc batteries).

关键词： lithium batteries ionic liquids liquid electrolytes polymer electrolytes composite polymer electrolytes

ON BONNESEN-STYLE SYMMETRIC MIXED ISOHOMOTHETIC INEQUALITY IN R^2

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Acta Mathematica Scientia 2019年第5期39卷 1319-1329页

作者： Yuanyuan wang xingxing wang Chunna ZENG College of Science Wuhan University of Science and Technology Wuhan 430081 China School of Mathematics and Statistics Shanghai Lixin University of Accounting and Finance Shanghai 201620 China School of Mathematical Sciences Chongqing Normal University Chongqing 401331 China

In this paper,we investigate the translative containment measure for a convex domain K_i to contain,or to be contained in the homothetic copy of another convex domain tK_j(t≥0).Via the formulas of translative Blaschke and Poincare in integral formula,we obtain a Bonnesen-style symmetric mixed isohomothetic *** Bonnesen-style symmetric mixed isohomothetic inequality obtained is known as Bonnesen-style inequality if one of the domains is a *** a direct consequence,we attain an inequality which strengthen the result proved by Bonnesen,Blaschke and ***,by the containment measure and Blaschke’s rolling theorem,we obtain the reverse Bonnesen-style symmetric mixed isohomothetic *** inequalities are the analogues of the known Bottema’s result in 1933.

关键词： translative containment measure isoperimetric inequality Bonnesen-style inequality Bonnesen-style symmetric mixed isohomothetic inequality reverse Bonessen-style symmetric mixed isohomothetic inequality

Selective immobilization of Pb(Ⅱ)by biogenic whewellite and its mechanism

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Journal of Environmental Sciences 2024年第3期137卷 664-676页

作者： xingxing wang Kaiyan Ren Kairui Jiao Wenjun Nie Xiaochi An Bin Lian College of Life Sciences College of Marine Science and EngineeringNanjing Normal UniversityNanjing 210023China

The development of bio-adsorbents with highly selective immobilization properties for specific heavy metals is a great challenge,but has important application *** whewellite(BW)with high selectivity for Pb(Ⅱ)was synthesized by mineral microbial *** selective immobilization properties and mechanism of BW for Pb(Ⅱ)were analyzed by combining mineral characterization technology and batch adsorption research *** results indicated that BW can efficiently and selectively immobilize Pb(Ⅱ)in single or composite heavy metal adsorption solutions,and the immobilized Pb(Ⅱ)is difficult to *** undergoes monolayer adsorption on Pb(Ⅱ),Qmax≈1073.17 mg/*** immobilization of Pb(Ⅱ)by BW is a physico-chemical adsorption process with spontaneous heat absorption and an accompanying increase in *** addition,the sequestration of Pb(Ⅱ)by BW remains around 756.99 mg/g even at p H=*** excellent selective immobilization properties of BW for Pb(Ⅱ)are closely related to its smaller Ksp,electrostatic repulsion effect,organic-inorganic composite structure,acid resistance and the formation of Pb(Ⅱ)*** study provides beneficial information about the recycling of lead in acidic lead-containing wastewater and composite heavy metal contaminated water bodies.

关键词： Aspergillus niger Biogenic whewellite Pb(Ⅱ) Selective adsorption Immobilization mechanism

Glycerol carbonate synthesis from glycerol and dimethyl carbonate using guanidine ionic liquids

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1182-1186页

作者： xingxing wang Peng Zhang Penglei Cui Weiguo Cheng Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

A large number of surplus glycerol from the biodiesel production can be used as renewable feedstock to produce glycerol carbonate. In this paper, a series of guanidine-based ionic liquids were synthesized to catalyze the transesterification of glycerol and dimethyl carbonate. The tunable basicity and the anion–cation cooperative effect were responsible for the obtained results. The [TMG][TFE] showed the best activity turnover frequency(TOF)of 1754.0 h^(-1), glycerol(GL) conversion of 91.8%, glycerol carbonate(GC) selectivity of 95.5%) at 80 °C with 0.1 mol% catalyst for 30 min. The reaction mechanism of the transesterification was also proposed.

关键词： Guanidine-based ionic liquids Glycerol carbonate Transesterification

N,N-Dimethyl fluorosulfonamide for suppressed aluminum corrosion in lithium bis(trifluoromethanesulfonyl)imide-based electrolytes

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Nano Research 2023年第6期16卷 8269-8280页

作者： Hao Wu Ziyu Song xingxing wang Wenfang Feng Zhibin Zhou Heng Zhang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education) School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Effective passivation of aluminum(Al)current collector at high potentials(>4.0 V ***/Li^(+))is of essence for the long-term operation of lithium-based ***,the non-aqueous liquid electrolytes comprising lithium bis(trifluoromethanesulfonyl)imide(LiTFSI)and organic carbonates are corrosive toward Al current collector at high potentials(>4.0 V ***/Li^(+)),despite their intriguing features(e.g.,good chemical stability and high ionic conductivity).Herein,we propose the utilization of N,N-dimethyl fluorosulfonamide(DMFSA)as electrolyte solvent for suppressing Al corrosion in the LiTFSI-based *** has been demonstrated that the electrolyte of 1.0 M LiTFSI-DMFSA shows decent ionic conductivities(1.76 mS·cm^(−1)at 25℃)with good fluidities(2.44 cP at 25℃).In particular,the replacement of organic carbonates(e.g.,ethylene carbonate and ethyl methyl carbonate)with DMFSA leads to significant suppressed Al *** and compositional characterizations utilizing scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS)reveal that DMFSA favors the formation of insoluble species(i.e.,aluminum fluoride(AlF_(3)))on the surface of Al electrode,which effectively inhibits continuous exposure of fresh Al surface to electrolyte during *** work provides not only a deeper understanding on the Al corrosion in LiTFSI-based electrolyte but also an elegant path to stabilize the Al current collector at high potentials(>4.0 V ***/Li^(+)),which may give an impetus into the development of lithium-based batteries.

关键词： aluminum current collector corrosion inhibition lithium bis(trifluoromethanesulfonyl)imide lithium-based batteries