Journal of Cleaner Production
·
2023
·
IF 11.1
Kang Li,Junjie Xie,Zhuonan Shi,Changli Min,Zichen Yin,Ruixin Ma,Shina Li
Rubidium and cesium are highly-priced and important rare alkali elements but they always co-exist with large amount of sodium and potassium in a complex system resulting very difficult and expensive to recover. Hexacyanoferrates (MHCFs) is one of the most efficient methods to separate Rb + and Cs + if we don't consider certain drawbacks such as too small particle size and too viscous liquids to be precipitated. In this study, a new kind of hexacyanoferrate, magnesium (II) hexacyanoferrate (RbCs–MgHCF) has been fabricated at room temperature and applied for the first time to recover Rb + and Cs + from high-salty solutions. Compared with traditional divalent transition elements, such as CuHCFs, ZnHCFs, NiHCFs, CoHCFs or FeHCFs, RbCs–MgHCF had excellent precipitation property and large particle size of about 300 nm. The structure, morphology and composition were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), Inductively coupled plasma (ICP), and Energy dispersive spectroscopy (EDS). The effects of various factors (divalent metal cations, surfactant, Mg 2+ /(Rb + +Cs + ) mole ratio, pH value and titration rate) on the recovery of Rb + and Cs + were explored in 50 mL batch experiments. Scale-up experiment were conducted in 6 and 18 L. Results identified that deposition ratio for Cs + and Rb + were 99% and 95% among pH ranges of 4.0–11.0. The composition of RbCs–MgHCF was confirmed to be Rb 0.61 Cs 1.20 K 0.17 Mg 1.01 Fe(CN) 6 by ICP and EDS and the synthesis mechanism of RbCs–MgHCF is proposed.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 8
·e202406007
·
IF 2
Chenxi Li,Kang Li,Shina Li,Ruixin Ma
Graphical In this study, copper hexacyanoferrate (CsRb–CuHCF) was used as a precipitant. Results demonstrated that CsRb–CuHCF can efficiently separate Rb + and Cs + from the high-salty solutions. The enrichment factor was up to 384 before and after precipitation. The precipitant reacts first with Cs + and then gradually with Rb + and can be used for the separation of Cs + and Rb + from each other. Cesium (Cs) and rubidium (Rb) are important rare alkali metal elements that are scarce and dispersed in nature. They often coexist with high amounts of Na + and K + . In this study, copper hexacyanoferrate (CuHCF) was used as a co-precipitant to enrich Cs + and Rb + in a high-salt solution. The effect of parameters, such as type and dose of divalent metal ions, solution pH, material dropping speed, reaction time, and temperature, was investigated for the recovery rate of Cs + and Rb + . Results showed that the recovery rates of Cs + and Rb + were 99.78% and 88.84% at the optimal Cu 2+ /(Cs + +Rb + ) molar ratio of 0.5, respectively. The reaction could be completed within 10 min in pH 3–8. The detailed characterization of the Cs + and Rb + containing co-precipitants, CsRb–CuHCF, confirm a general formula of Cs 1.09 Rb 0.81 K 0.16 Cu 0.97 Fe(CN) 6 . The (Cs + +Rb + )/(Na + +K + ) increased significantly from 0.074 to 28.47 before and after precipitation, which realized the effective enrichment of Cs + and Rb + . Studies of the precipitation reaction mechanism showed that the precipitant reacted first with Cs + and then with Rb + . This process offers a promising avenue for the enrichment and separation of Cs + and Rb + from high-salty solutions.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Huaiyin Chen,Zhonghe Wang,Jun Li,Xiaolin Liu,Congxiang Li,Yongzhao Li,Weihe Yu,Longmin Liu,Yi Zhang,Yuekun Lai,Weilong Cai
ZIF-8 is considered as a promising functional material in anti-corrosion coating applications. However, ZIF-8 hydrolyzes easily, especially in acidic and salty media, due to its unstable Zn–N coordination bonding and hydrophilic crystal surface, which reduces anti-corrosion durability of the coatings. In this study, highly hydrophobic modification of ZIF-8 particles was performed through simple surface ligand exchange with 5,6-dimethylbenzimidazole (DMBIM). The as-prepared ZIF-8/DMBIM particles showed high water-repellency and enhanced chemical stability in acidic, neutral, and alkaline media, and excellent compatibility and barrier function in epoxy coatings. As a consequence, ZIF-8/DMBIM modified epoxy coatings showed significantly enhanced corrosion resistances in acid, alkali and salt aqueous solutions with pH 3.0–11.0. Electrochemical impedance spectroscopy tests demonstrated that, after 20 days of immersion in 3.5 wt% NaCl solution at all the studied pH, the |Z| 0.01 Hz values of ZIF-8/DMBIM modified epoxy coatings were approximately two orders of magnitude higher than of the original epoxy coatings. This work provides an idea for the development and application of ZIF materials in more fields, and innovative anti-corrosion coatings based on functional modification of materials.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Shunyan Ning,Shichang Zhang,Wei Zhang,Jie Zhou,Siyi Wang,Xinpeng Wang,Yuezhou Wei
The separation of fission products Ru, Rh, and Pd will benefit both the nuclear fuel cycle and enlarge the platinum group metals source. A silica-based iso Bu-BTP/SiO 2 -P adsorbent was used to separate Ru, Rh, and Pd from nitrate solution. It exhibited good adsorption towards Ru, Rh, and Pd with the uptake rates over 95% at 55 °C in 0.1 M HNO 3 –3 M NaNO 3 solution and no adsorption towards 238 U(VI). The adsorption towards Ru, Rh, and Pd matched well with pseudo-second-order model with the equilibrium obtained within 24 h, 24 h and 0.5 h and Langmuir adsorption isotherm model with the saturation adsorption amounts as high as 0.37 mmol/g, 0.34 mmol/g and 0.71 mmol/g respectively. The adsorbed Pd, Rh, and Ru can be desorbed by 0.1 M HNO 3 –0.1 M thiourea , 2 M HCl and NaClO solution (CP) which is expected to realize their mutual separation in desorption stage using the above-mentioned eluents successively. Both FT-IR and XPS revealed that C N C played key role during adsorption and the adsorption needed the participation of NO 3 − to keep charge balance. In a word, iso Bu-BTP/SiO 2 -P is a promising adsorbent for separation and recovery Ru, Rh, and Pd, especially in the case of separating them from other fission products and actinides from high level liquid waste .
研究领域:
核化学
·
材料科学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 3
·351
·
IF 2.67
Wendi Yu,Lu Yang,Jing Zhao,Hongjie Luo
The transport and crystallization processes of chromogenic 5.0% CuSO4solution in the supporting body and coarse plaster of simulated wall painting samples were observed. A scanning electron microscope a and self-designed double-layer surface contact internal pressure method were used to test, respectively, the micro-morphologies of salt crystals in different regions and the micro-forces on the contact surfaces during the spread and crystallization of water and salt solution. The results demonstrate that the salt crystals formed by the CuSO4solution on the surface of the simulated wall painting showed two different shapes: a salt belt formed by clustered crystals, and a layer of salt crust. The difference was speculated to be related to the crystals’ growth conditions. The destructive effect of salt solution and salt crystals on wall paintings manifested itself by weakening the connectivity between different materials, and changing the volume and morphology of the wall paintings. Using the double-layer surface contact internal pressure method, the forces generated by the salt solution and salt crystals on the simulated wall paintings were demonstrated to be adsorption force, expansion force generated by the crystals’ precipitation and growth, and suction force resulting from water loss and the shrinkage of crystals. The expansion force and suction force were not in a stable state, resulting in the contact surfaces continuously bending and stretching. Compared with pure water, salt solution can aggravate damage to the stability of wall paintings. This analysis of the transport, crystallization and micro-forces of a chromogenic salt solution in simulated wall painting samples can provide a scientific basis for studying the general patterns of damage caused by soluble salt to wall paintings during its transport and crystallization, and provide insight that can further the protection of cultural relics.Keywords:chromogenic salt solution;simulated wall painting;transport and crystallization;micro-force
研究领域:
文物保护
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Extreme Manufacturing
·
2025
·
IF 21.3
Guofeng Liu,Pengcheng Xia,Weicheng Kong,Tianhong Qiao,Yuan Sun,Wenjie Ren,Yong He
3D printing of soft/tough hydrogels has been widely used in flexible electronics, regenerative medicine, and other fields. However, due to their loose crosslinking, strong hydration and plasticizing effect of solvent (typically water) and susceptibility to swelling, the printed hydrogels always suffer from bearing compressive stress and shear stress. Here we report a 3D photo-printable hard/soft switchable hydrogel composites which enabled by the phase transition (liquid/solid transition) of supercooled hydrated salt solution (solvents) within hydrogel. In hard status, it achieved a hardness of 86.5 Shore D (comparable to hard plastics), a compression strength of 81.7 MPa and Young's modulus of 1.2 GPa. These mechanical property parameters far exceed those of any currently 3D printed hydrogels. The most interesting thing is that the soft/hard states are easily switchable and this process can be repeated for many times. In supercooled state, the random arrangement of liquid solvent molecular within hydrogels makes it as soft as conventional hydrogels. Upon artificially seeding of crystal nucleus, the solvent in hydrogel undergoes rapid crystallization, resulting in the in-situ formation of numerous rigid, ordered rod-like nanoscale crystals uniformly embedded within the hydrogel matrix. This hierarchical structure remarkably enhances the Young's modulus from kPa to GPa. Furthermore, the softness of hydrogel can be restored by heating and then cooling down to recover the supercooled state of solvent. Taking the advantage of soft/hard status switching, the hydrogel can conform to complex surface morphologies in their soft and then frozen that shape through crystallization, enabling rapid mold fabrication. Moreover, a shape fixation and recyclable smart hydrogel medical plaster bandage was developed also, capable of conforming the limb shapes and providing adequate support for the bone fracture patients after 10 minutes of crystallization. Our work suggests a bright future for direct use of the hard hydrogel as a robust industrial material.
研究领域:
生物材料学
·
医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yongmei Xuan,Bosheng Duan,Kaile Fang,Yaqi Ding,Neng Gao,Guangming Chen
The vapor pressure properties of ionic liquids (ILs) 1-ethyl-3-methylmidazolium iodide ([Emim]I) and 1,3-dimethylimidazolium iodide ([Dmim]I) as absorbent species in lithium chloride aqueous solution (LiCl/H2O) are experimentally investigated. The vapor pressure data of ternary IL mixtures, LiCl + [Emim]I + H2O (mass ratio LiCl/[Emim]I = 3) from a temperature of 338.26–419.83 K at three mass fractions of the absorbent (0.3, 0.4, and 0.5) and LiCl + [Dmim]I + H2O (mass ratio LiCl/[Dmim]I = 3) from a temperature of 354.54–427.23 K at four mass fractions of the absorbent (0.3, 0.4, 0.5, and 0.54), were measured and reported using the boiling point method. The Antoine-type equation was used to fit the experimental data. The average absolute relative deviation (AARD%) values of the experimental data and the calculation results were 0.416 and 0.515%, respectively. By comparing the measured vapor pressure data with a binary mixture (LiCl + H2O), the ternary system of lithium bromide aqueous solution and the same IL (LiBr + ILs + H2O), and ternary mixtures of lithium chloride and ILs of the same organic cation (LiCl + ILs + H2O), it was found that, under experimental conditions, the order of vapor pressures of the proposed ternary systems is LiCl + [Dmim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + H2O, LiCl + [Emim]I + H2O < LiBr + [Emim]I + H2O, LiCl + [Dmim]I + H2O < LiBr + [Dmim]I + H2O, LiCl + [Emim]I + H2O < LiCl + [Emim]Cl + H2O < LiCl + [Emim]Br + H2O, and LiCl + [Dmim]I + H2O < LiCl + [Dmim]DMP + H2O < LiCl + [Dmim]Cl + H2O < LiCl + [Dmim]BF4 + H2O.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Hengxin Fang,Zhixu Tang,Xinjuan Liu,Yongli Huang,Chang Q. Sun
It has been a long pursuit to discriminate the ionic roles of mono- and di-valent salt solutions in modulating the hydrogen bonding network and solution properties. We attended this issue by examining the effect of concentrated YX 2 (Y Mg, Ca, Sr; X Cl, Br) solvation on O:H O bonds transition from the mode of ordinary water to hydration in terms of the number fraction f YX2 ( C ) and the segmental O:H O bond phonon stiffness shift Δω(C) with C being the solute concentration. The invariant df Y ( C ) / dC at C ≤ <0.05 suggests that the small Y 2+ forms a constantly-sized hydration droplet with weak responding to interference of other ions because its hydrating H 2 O dipoles screen mostly its electric field. However, the number inadequacy of the highly-ordered hydrating H 2 O dipoles partially screens the large X − . The X − ↔ X − electrostatic repulsion weakens its electric field. The concentration-trend consistency of the f YX2 ( C ), the solution conductivity σ YX2 ( C ), and surface stress (contact angle) θ YX2 ( C ) for YX 2 solutions clarifies their common origin of ionic polarization. However, the Jones–Dale notion disobedience of the viscosity η YX2 ( C ) suggests the dominance of the inter-ion repulsion.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Xinqian Li,Bo Li,Yaping Dong,Zhengrong Niu,Dandan Gao,Haitao Feng,Wu Li
How to effectively and environmentally purify chromate solutions containing impurities such as silicon and vanadium, and avoid the generation of Cr(VI)-containing residues are important issues to be solved urgently. Herein, a novel Cr 2 O 3 ∙2.7H 2 O adsorbent with stable three-dimensional nanoflower structure was fabricated using the hydrothermal method , which was successfully implemented in the removal of Si(IV) and V(V) from dichromate system. Batch adsorption experiments revealed that the saturated adsorption capacity of Si(IV) was 140.06 mg/g at pH 9 and 132.98 mg/g V(V) at pH 2. Furthermore, density functional theory (DFT) calculations revealed that V(V) anionic species exhibited high adsorption energies (−990.70 kJ/mol, −697.10 kJ/mol) and small adsorption distances from the β-CrOOH(012) (≈1.89 Å, 1.98 Å), verifying the selective adsorption of Cr 2 O 3 ∙2.7H 2 O on V(V) in Cr(VI)–Si(IV)–V(V) ternary systems . The integrated mechanisms of electrostatic interaction, coordination, polymerization and precipitation for the removal behaviors were proposed via FT-IR, XPS and DFT calculations. In the real Na 2 Cr 2 O 7 complex solutions, the simultaneous removal rates of 88.48% Si(IV) and 80% V(V) were achieved, with optimal adsorption conditions at a pH of 8 and a temperature of 333 K. Furthermore, the desorbed Cr 2 O 3 ∙2.7H 2 O can be effectively converted into high-value nano Cr 2 O 3 , indicating the potential of this new green adsorbent. Therefore, this study not only imparts theoretical and practical insights into the purification of chromate solutions but also contributes to the advancement of cleaner chromium compound production by facilitating the high-value conversion of the adsorbent.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2017
·Vol. 9
·期 7
·296
·
IF 3.364
Caili Dai,Zhongliang Xu,Yining Wu,Chenwei Zou,Xuepeng Wu,Tao Wang,Xu Guo,Mingwei Zhao
Water-soluble polymers are widely used in oilfields. The rheological behaviors of these polymers in high-salinity solution are very important for stimulation of high-salinity reservoirs. In this work, a novel thermal-resistant and shear-stable amphoteric polyacrylamide (PASD), prepared from acrylamide (AM), sodium styrene sulfonate (SSS), and acryloxyethyl trimethylammonium chloride (DAC) monomers, was prepared by free-radical polymerization in high-salinity solution. The amphoteric polyacrylamide was characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance spectroscopy (1H NMR), elemental analysis, thermogravimetric analysis (TG), and scanning electron microscopy (SEM). The amphoteric polyacrylamide exhibited excellent salinity tolerance. The slow increase in apparent viscosity of the polymer with increase in salinity was interesting. The amphoteric polyacrylamide showed perfect temperature resistance in high-salinity solution. The viscosity retention reached 38.9% at 120 °C and was restored to 87.8% of its initial viscosity when temperature was decreased to room temperature. The retention ratio of apparent viscosity reached 49.7% at 170 s−1and could still retain it at 25.8% at 1000 s−1. All these results demonstrated that PASD had excellent thermal-resistance and shear-stability in high-salinity solution. We expect that this work could provide a new strategy to design polymers with excellent salinity-tolerance, thermal-resistance, and shear-stability performances.Keywords:amphoteric polyacrylamide;high-salinity solution;thermal-resistance;shear-stability
研究领域:
化学工程
·
石油工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
SuSu Liu,Zheng Lian,Mingjia Zhang,Shule Zhang,Qin Zhong
A novel strategy was proposed to scrub NO x pollutant originated from sintering flue gases by oxidation combined with wet flue gas denitrification technology. CuCl 2 that could be adopted repeatedly was introduced as an additive into the sulfite solution to enhance NO 2 removal. Comparing with the sulfite solution (0.05 mol/L), the absorption efficiency improved from 75% to 100%, and the stabilization period extended from 10 to 40 min notably with the addition of CuCl 2 . The intensification by CuCl 2 addition was related to the formation of CuCl during the reaction of CuCl 2 and SO 3 2− , which was found to be more effective in removing NO 2 . Afterwards, CuCl transformed to Cu 2+ substance again and this mutual transformation between CuCl and Cu 2+ substance indicated a cyclic use of CuCl 2 additive. Moreover, the feasible reaction pathway was further proved by DFT calculations. Additionally, the investigation on NO 2 absorption at various operating parameters provided theoretical support for the practical application of CuCl 2 in denitrification.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Tao Xu,Jincheng Mao,Yang Zhang,Xiaojiang Yang,Chong Lin,Anqi Du,Heng Zhang
In this study, a viscoelastic surfactant (VES), named VES-Q, with erucyl amide tails and cyclodextrin was successfully synthesized, and the phase behavior of aqueous VES solutions at different salt concentrations was observed. In addition, the size of the molecules under different salt types was measured using dynamic light scattering . The viscosity of VES-Q in salt solution corresponds to the molecular size of the surfactant was found. Due to the high salinity tolerance of VES-Q to common formation salts, we used formation water from West Sichuan and seawater the Gulf of Mexico to allocate VES-Q to two clean fracturing fluids , namely, fluid 1 and fluid 2, with a concentration of 2%. Rheological properties under high-temperature reservoir conditions were simulated. The clean fracturing fluid was prepared by the VES-Q method, and its performance met the requirements of hydraulic fracturing operations.
研究领域:
化学工程
·
石油工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）