DESALINATION
·
2023
·
IF 9.9
Shiwei Guo,Bo Yuan,Jicheng Wu,Hao Wang,Jianquan Luo,Chungang Yuan
Interfacial polymerization (IP) plays a vital role in the manufacturing process of polyamide (PA) nanofiltration (NF), which is of great value in a wide variety of separation processes. In this study, we proposed a catalytic strategy to mix proton sponge/hexane solution and TMC/hexane solution during the interfacial polymerization reaction, thus achieving a facilitative modulating effect on the interfacial polymerization process. The nanofiltration membranes prepared by the catalytic strategy showed reduced thickness of the separation layer, reduced roughness, and more uniform pore size distribution than the blank membrane. As a result, the modified membranes showed nearly double permeate flux (from 8.0 to 15.9 Lm −2 h −1 bar −1 ) and slightly increased Na 2 SO 4 retention, as well as improved separation selectivity for monovalent/divalent salts and stronger antifouling ability. At the same time, this strategy also improved the uniformity of membrane pore size distribution while loosening the membrane structure. The illustrated strategy based on the catalytic modulation of interfacial polymerization by proton sponge achieved an enhancement of all aspects of nanofiltration membrane performance through such a simple step, showing good prospects for application in the manufacture of membrane for high performance nanofiltration.
研究领域:
材料科学
·
化学工程
·
环境工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.5
Xiaojun Bao,Yu Cao,Lei Gong,Renjiang Li,Dongshun Deng
As an important and free amino acid, taurine (Tau) shows extensive application in pharmaceuticals. The coexistence of inorganic salts during the production process affects the purity and quality of Tau. Present study firstly described a novel method to separate Tau and Na2SO4 by forming deep eutectic solvents (DESs) in situ. Ethanolamine (MEA) was chosen as the optimal hydrogen bond donor to pair with Tau. After removal of Na2SO4, taurine was stripped out from in situ DES using n-propanol as reverse solvent with the yield of 98% and trace impurities (Na2SO4 and NaCl contents less than 13.70 mg•g -1 and 12.93 mg•g -1 , respectively). On the optimized parameters, the Tau purification and separation process were further elucidated using quantum chemical calculations and molecular dynamics simulations together. Results showed the interaction energy of 116.1 kJ/mol between MEA and Tau, confirming the superiority of Tau purification using DES in situ.
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Jixi Chen,Jinqing Jia,Mengyu Zhu
With an optimized dosage, hardening accelerators become a vital means of modifying fly ash-cement system (FAC). This study comprehensively investigated the mechanical properties of FAC modified by Li 2 CO 3 , Na 2 SO 4 , and triethanolamine (TEA) under different dosages, and optimized the dosage of accelerators through the response surface method (RSM). The synergistic effect of accelerators on the hydration of FAC was characterized by thermogravimetric differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results demonstrated that the factors and response value followed a quadratic polynomial model. The regression coefficients R 2 of the model were all greater than 0.9, indicating good agreement with the experimental data. The content of Li 2 CO 3 and Na 2 SO 4 had an extremely significant effect on the compressive strength of 1d and 3d, followed by TEA. The optimal mix ratio predicted by RSM was 0.12 % Li 2 CO 3 , 0.47 % Na 2 SO 4 , and 0.40 % TEA. Early hydration stages revealed that the combined action of these accelerators increased the formation of CH, CaCO 3 , and amorphous C-(A)-S-H gel. Microscopically, the surface of fly ash exhibited alkali-induced corrosion, thereby enhancing its pozzolanic reactivity.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Xiangyang Liu,Zeyang Kang,Jiahao Zhao,Shaoxuan Huang,Ying Zhang,Maogang He
Coupling with supercritical power cycle can improve the thermal efficiency of the concentrated solar system. Design the suitable thermal storage medium is critical to the new coupling system. A new ternary eutectic salt with low cost was developed composed of NaCl , Na 2 CO 3 , and Na 2 SO 4 based on the calculation method of phase diagram , meeting the requirements of solar energy storage over 873 K. The eutectic point and composition of the designed salt were predicted to be 900 K and 50 mol% NaCl-35 mol% Na 2 CO 3 -15 mol% Na 2 SO 4 . The designed salt shows high specific heat capacity and phase-change enthalpy, and low cost, which indicates it has good thermal storage capacity. Composite phase change materials with multi-walled carbon nanotubes and graphene nanosheets which can enhance the thermal conductivity and heat capacity of designed salt were prepared. The effects of preparation methods on the thermophysical properties of the composite phase change materials were analyzed.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 22
·期 1
·e14882
·
IF 1.8
Yifei Dai,Yuxuan Liao,Aoping He,Huan He,Tianquan Liang
The hot corrosion behaviors of the Sc 2 O 3 –Gd 2 O 3 –Y 2 O 3 co-doped ZrO 2 (SGYSZ) ceramics in Na 2 SO 4 + V 2 O 5 molten salts at high temperature were investigated in this work. The results show that the SGYSZ exhibits good hot corrosion resistance to the 50 wt% Na 2 SO 4 + 50 wt% V 2 O 5 molten salts at 1000°C. It is attributed to the doping of small Sc 3+ , which can decrease the M–O bonding length and increase the binding energy, and then reduce the dissolution and loss of the stabilizer as rare-earth cations Gd 3+ and Y 3+ from the SGYSZ. The significant synergistic effects of Sc 3+ , Gd 3+ , and Y 3+ are beneficial to enhance the phase stability and corrosion resistance of the zirconate ceramic due to the different ionic radius and basicity of rare-earth oxides (RE 2 O 3 ). More Gd 3+ in SGYSZ can promote the forming and coarsening of the GdVO 4 during mineralization, which can also decrease the loss of Y 3+ from the SGYSZ. The corrosion mechanism is discussed in detail.
研究领域:
材料科学
·
陶瓷
·
高温腐蚀
·
无机化学
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DOI
高影响因子
ACS ES&T Engineering
·
2026
·
IF 6.3
Haeun Jeon,Daniel Kim,Hyunjin Kim,Minhui Kim,Seonghwan Kim,Nayeong Kim,Choonsoo Kim
Abstract Redox-mediated bipolar-membrane electrodialysis (redox-BMED) is an emerging electrochemical platform for sustainable resource recovery that replaces conventional water-splitting reactions with reversible redox chemistry and employs non-precious, porous carbon electrodes. This approach is particularly promising for valorizing industrial sodium sulfate (Na2SO4) wastewater generated from spent lithium-ion battery recycling. However, practical deployment requires optimization of multi-electrode and channel stack architectures to reduce mass-transport limitations and ohmic losses. Here, we investigate the effects of electrode- and channel-stack configurations on energy efficiency and treatment throughput in redox-BMED. Independent evaluation shows that electrode stacking mainly enhances energy efficiency by lowering polarization losses, whereas channel stacking increases treatment throughput by expanding the number of parallel ion-transport pathways. Optimization of combined architectures identifies a 12 electrode/2 channel configuration as the favorable balance architecture, achieving a ∼42% reduction in specific energy consumption relative to the 1 electrode/1 channel configuration (2.91 to 1.69 kWh kg–1 Na2SO4) while preserving near-quantitative charge efficiency (∼99%). These results indicate that electrode and channel stacks play complementary roles, jointly minimizing energy losses and sustaining efficient ion transport. Overall, this work provides practical design principles for balancing electrode and channel configurations for scalable, energy-efficient redox-BMED-based Na2SO4 valorization.
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2025
·
IF 2.4
Huimin Li,Yucheng Lin,Liutao Hou,Yuli Wang,Huijuan Tian,Shiqiang Zhao,Chun Chang
BACKGROUND 5-Hydroxymethylfurfural (HMF), as an important biomass platform compound, can be transformed into biofuels and numerous high value-added chemicals, and occupies an extremely important position in biorefining. Herein, a novel catalytic system has been developed for the direct conversion of glucose to HMF using inexpensive Na 2 SO 4 /NH 4 HSO 4 as the catalyst. RESULTS The maximum glucose conversion of 90.77% with 45.05% yield of HMF was obtained at 190 °C, catalyst Na 2 SO 4 /NH 4 HSO 4 80 wt%, water and methyl isobutyl ketone volume ratio 1/5, and residence time 20 min. A kinetics model was developed to predict the yield of HMF and glucose conversion, which was consistent with the experimental results. CONCLUSION The continuous production of HMF from glucose can be efficiently performed with Na 2 SO 4 /NH 4 HSO 4 with a mass ratio of 3/2 as the catalyst. This catalytic system for the continuous production of HMF has great practical significance and potential economic value for promoting the industrial production of HMF and its derivatives. © 2025 Society of Chemical Industry.
研究领域:
生物质转化
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催化化学
·
化工工艺
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Minghui Du,Ruohan Wang,Hong Wang,Jianxin Li
Removal of organic pollutants while recovering Na 2 SO 4 is crucial for the dyeing wastewater resourcefulness. In this study, nanofiltration (NF) was used for the treatment of industrial dyeing wastewater (COD=294.2 mg L −1 , the concentration of Na 2 SO 4 = 3.8 g L −1 ). An electrochemical membrane reactor (ECMR) was then constructed with conductive carbon membrane (CM) as cathode and graphite as anode for the organic removal from the NF concentrate with high concentration of Na 2 SO 4 for reuse. Meanwhile, ECMR was also coupled with ozone (O 3 ) to enhance its performance. Electron spin resonance (ESR) was employed to investigate the generation of active species during the ECMR-O 3 system. The organics were analyzed by excitation-emission matrix (EEM). The results show that Na 2 SO 4 concentration of 18.4 g L −1 and purity of 92.4 % were achieved from the NF concentrate. After the NF concentrate was treated by ECMR-O 3 system, the COD reduced to 48.6 mg L −1 with a removal rate of 92.7 %, which was higher than that of O 3 oxidation (57.7 %) and ECMR (13.9 %) alone. It was ascribed to the electrolysis of O 3 flowed through the cathodic CM, leading to more HO∙ produced. Certainly, the high concentration of Na 2 SO 4 in the NF concentrate provided a high conductivity environment for the optimal operating of ECMR and the CM promoted the enhanced mass transfer under the diffusive conditions of O 3 . The NF concentrate treated could be directly reused for dyeing fabrics, making a profit of 0.25 $ m −3 and reducing a carbon emission of 46.81 %. (2.79 kg CO 2 m −3 ). In a word, this study offers a viable approach for dyeing wastewater treatment and Na 2 SO 4 resources recover.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yan Liu,Yue Sun,Zheng Peng
Salicylic acid (SA) is an important chemical raw material, but its production process generates large amounts of phenol-containing hypersaline wastewater . Bipolar membrane electrodialysis (BMED) technology was proposed to remove Na 2 SO 4 from this wastewater and generate NaOH and H 2 SO 4 . The influences of initial pH in feed solution, current density, flow velocity, initial Na 2 SO 4 concentration and volume ratio on the BMED process were investigated. These findings revealed that pH had no significant effect on the desalination rate, but affected the migration of organics including phenol and SA. When the input current density was 40 mA/cm 2 , flow velocity was 4.0 cm/s and the volume ratio was 2:1, the concentrations of H 2 SO 4 and NaOH could reach the maximum at 0.97 mol/L and 1.56 mol/L respectively, with initial Na 2 SO 4 concentration of 80 g/L and corresponding to a desalination rate of 96.3%. The current efficiency of acid was 55.2% and that of base was 50.2%, and energy consumption was 2.89 kWh/kg H 2 SO 4 and 3.98 kWh/kg NaOH. These results confirmed BMED technology could treat simulated SA wastewater effectively and produce H 2 SO 4 and NaOH. It provides a theoretical basis and guidance for the practical treatment of this type of wastewater.
研究领域:
环境工程
·
化学工程
·
废水处理
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产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 8
·3488-3504
·
IF 3.2
Lubing Xiang,Xi Yu,Aimin Xiang,Xiaoying Lu,Meng Zhang,Hongfu Zhou
In this work, porous poly (vinyl alcohol) (PVA) hydrogels with different pore sizes were fabricated using inorganic non-metallic porogens by an environmentally friendly method, providing a potential solution for the field of wastewater treatment. PVA hydrogels have gained much attention in the field of wastewater treatment due to their excellent adsorption performance and porous network structure. However, the employment of inorganic non-metallic salts as porogens for PVA hydrogels has received limited attention so far. In this study, porous PVA hydrogels were prepared by freeze-thawing and freeze-drying with sodium sulfate (Na 2 SO 4 ) and calcium carbonate (CaCO 3 ) as porogens. PVA-Na exhibited denser network structure with the concentration of Na 2 SO 4 solution increased, and the tensile stress was enhanced by about 45 times. Meanwhile, the tensile stress of PVA-Ca was improved significantly from 0.06 to 1.67 MPa, and the network structure became looser after adding CaCO 3 . Moreover, a comprehensive investigation was conducted on the adsorption performance of porous PVA hydrogel for Congo red (CR). Finally, five adsorption models were fitted to investigate the adsorption mechanism of porous PVA hydrogels, in which the maximum adsorption capacity of CR by PVA-Na-0.5 was predicted to be 215 mg/g by the Langmuir isothermal model fitting. Highlights The structure of PVA hydrogels was adjusted by Na 2 SO 4 and CaCO 3 , respectively. The tensile stress of PVA-Na with dense network structure increased 45 times. Compared to PVA-FD, swelling equilibrium time of PVA-Na reduced from 24 to 6 h. Equilibrium swelling rate of PVA-Ca declined by half in comparison to PVA-FD. Langmuir isothermal model predicted q max of 215 mg/g for CR by PVA-Na-0.5.
研究领域:
材料科学
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环境科学
·
废水处理
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产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Huiqiang Liu,Yingbo Chen,Xiaoyu Hu,Kai Zhang,Bowen Cheng,Dongqing Liu,Yufeng Zhang,Sankar Nair
In this work, a titanium oxide/polyvinylidene fluoride (TiO 2 /PVDF) hollow fiber membrane was fabricated to fractionate the dye and Na 2 SO 4 produced in textile wastewater. This hollow fiber membrane offered high retention of Congo red and methylene blue dyes with little rejection of Na 2 SO 4 . More importantly, the membrane was obtained using single orifice spinneret through a simple, rapid, and less expensive procedure. Meanwhile, the membrane exhibited good hydrophilicity, flux recovery ratio, and long-term stability, when appropriate blending of TiO 2 nano-particles was conducted. These results highlight interesting potential applications, and open new directions toward the designing of efficient functional hollow fibers for effective fractionation of dye and Na 2 SO 4 for the treatment of textile wastewater.
研究领域:
环境工程
·
膜科学
·
水处理
·
纳米复合材料
·
分离技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Lan Yang,Xiuxiu Yang,Dan Li,Liwei Zhuang,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and refractive indices in the systems Na 2 SO 4 –NaBO 2 –H 2 O and NaCl–Na 2 SO 4 –NaBO 2 –H 2 O at 323.15 K were studied by the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for Na 2 SO 4 and NaBO 2 ·4H 2 O. A comparison of the diagrams of system Na 2 SO 4 –NaBO 2 –H 2 O from 288.15 K to 323.15 K shows that the crystallization region of NaBO 2 ·4H 2 O changes greatly as the temperature increasing, and the solid phase of mirabilite at 288.15 K and 298.15 K transforms into the nardite at 308.15 K and 323.15 K. The dry-salt diagram of the quaternary system consists of four salt crystallization fields for NaCl , NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and Na 2 SO 4 , five univariant solubility curves and two invariant points. On the basis of the Pitzer model, the lacking Pitzer parameters and dissolution equilibrium constants of the solid phases in this quaternary system were fitted with the solubilities and other thermodynamic properties in this study and literature. The calculated solubilities in the two systems are in good agreement with the experimental data.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）