SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Qing Lin,Xiuwu Liu,Xinxin Zhang,Zhiqiu Ye,Jing Fang,Zhensheng Yang,Hao Li
The development of simple and effective strategies for uranium extraction from seawater is crucial to addressing the energy crisis. In this study, we designed and prepared PEI/SA-PAO composite gel spheres with double cross-linking networks, based on a synergistic approach combining polyelectrolyte self-assembly and supramolecular cross-linking. The composite gel spheres utilized sodium alginate (SA) and polyethyleneimine (PEI) as polyelectrolyte substrates, which self-assembled into a primary network through electrostatic interactions. Calcium ions (Ca 2+ ) were then used as a cross-linking agent to construct a supramolecular network. The resulting hierarchical macroporous structure within the gel spheres facilitated the diffusion and mass transfer of uranyl ions. The carboxylate, amino, and amidoxime groups within the material exhibited a high adsorption capacity of 467.56 mg/g in an 8 ppm uranyl solution through a synergistic coordination-chelation effect. After four cycles, the gel material retained an adsorption capacity of 342.54 mg/g. The material also demonstrated excellent selectivity for uranyl ions in natural seawater, achieving uranium adsorption of 5.6 mg/g, underscoring its significant potential for practical application in uranium extraction from seawater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Guijuan Liu,Xiao Xiao,Jie Wang,Yao Liang,Zhenrong Zhou,Weixing Li
The development of ethanol dehydration membranes with superior separation performance and long-term stability is an essential objective for pervaporation. HOF-21 with pore size of 3.6 Å could make way for water transportation while rejecting ethanol molecules. Here, amine-modulated HOF-21 (HOF-21-a) was proposed to dope into the sodium alginate (SA) separation layer on the polyacrylonitrile (PAN) substrate for ethanol dehydration. Molecular simulation results confirmed the superior water permeance of the HOF-21-a membrane. To enhance the interfacial bonding strength, polyethyleneimine (PEI) and catechol (CT) were coated onto the PAN substrate and crosslinked to form a robust network between the top separation layer and the support layer. The novel HOF-21-a@SA/M-PAN membrane, incorporating a hydrogen-bonded organic framework, was designed for efficient ethanol dehydration. Experimental results demonstrated that the prepared composite membrane exhibited excellent separation performance at a PEI/CT mass ratio of 1:1 and a HOF-21-a loading of 1.0 wt%. Specifically, the permeate flux increased significantly from 606 g·m −2 ·h −1 to 2389 g·m −2 ·h −1 with the separation factor improved from 153 to 2267 at 75 °C. Additionally, the composite membrane demonstrated outstanding long-term stability. The newly developed membrane offers a promising solution for organic solvent dehydration.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·
IF 4.7
Liu Peng,Bi Yuanyuan,Gu Yaxin,Li Xiangyu,Mao Junpeng,Shan Xiantong,Cao Ji
In this study, a novel hydrogel nanofiltration (NF) membrane is developed through the coating-crosslinking method by synergistically utilizing multi-walled carbon nanotubes (MWCNTs) and titanium dioxide (TiO 2 ) into the hydrogel coatings of sodium alginate (SA) and polyvinyl alcohol (PVA) on a porous polyvinylidene fluoride (PVDF) matrix membrane. The experimental findings demonstrate that the P-MT@SA-PVA-PVDF hydrogel NF membrane displays outstanding separation performance, hydrophilicity, and antifouling properties. When the ratio of MWCNTs to PVP is kept at 1:4, the pure water flux of the prepared hydrogel NF membrane reaches 226.2 L/(m 2 ˑh). The rejection rates for Coomassie brilliant blue, Congo red, and Methylene blue are 96.3%, 95.8%, and 92.1%, respectively. Moreover, the total fouling rate of the membrane is merely 28.7%, and the flux recovery rate can attain 93.1%. The remarkable hydrophilicity and highly efficient rejection rates for dyes indicate broad application prospects of MWCNTs-modified hydrogel NF membranes in the field of printing and dyeing wastewater treatment.
研究领域:
材料科学
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环境工程
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高影响因子
LANGMUIR
·
2022
·
IF 4.331
Jie Han,Yao Liang,Chengxiu He,Yujia Tong,Weixing Li
A catalytic composite membrane was developed for the enhancement of esterification by lyophilization for the first time. The catalytic composite membrane was composed of a poly(vinyl alcohol) (PVA)-sodium alginate (SA) separation layer and a spongy porous catalytic layer cross-linked by PVA and 4-sulfophthalic acid (SPA). Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) results indicated the successful synthesis of the catalytic composite membrane. The membrane properties were evaluated by ethanol dehydration and esterification. The conversion rate of acetic acid reached 95.9% after 12 h. Compared with batch reactions, the conversion rate increased by 24.4%. After five cycles, the membrane still maintained outstanding catalytic activity. The resistance of mass transfer was analyzed, and the results showed that the porous structure reduced the catalytic layer resistance to total resistance from 70.27 to 32.88%. The composite membrane with a spongy porous catalytic layer exhibited superior dehydration and catalytic performance.
研究领域:
材料科学
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化学工程
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Chenyang Wang,Jihui Wang,Wenbin Hu
ZnO@ZIF-8 films were prepared on Q235 steel surface through solvothermal reaction by pre-electrodepositing ZnO films and modified with stearic acid (SA). The surface morphology , elements content, crystal structure and chemical structure of films were studied by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The wettability of films was measured by water contact angle meter. The corrosion behavior of films was tested by Electrochemical tests. ZnO films show hexagonal nanotubular morphology, having the best compactness and corrosion resistance at deposition current density of 2.3 mA/cm 2 with the protection efficiency of 90.11%. After solvothermal reaction, ZIF-8 grains are formed and clad ZnO nanotubes , forming a contact film to prevent corrosive ions attacking steel efficiently. ZnO@ZIF-8 films have the best compactness and corrosion resistance at Zn 2+ concentration of 0.06 mol/L with the protection efficiency of 99.83%. But the corrosion resistance of ZnO@ZIF-8 film declines quickly for the water molecules can get inside the film and destroy the bond between ZIF-8 grains. Thus, SA was grafted to ZnO@ZIF-8 film to enhance its hydrophobicity . After SA modification, the protection efficiency reaches 99.99% and maintains at 95.29% after 14 days immersion in the solution of 3.5 wt.% NaCl .
研究领域:
材料科学
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腐蚀与防护
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 7
·51627
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IF 3.125
Tingting Wang,Jinqing Wang,Zhangpeng Li,Mingqiang Yue,Xiaoli Qing,Pengxia Zhang,Xiaozhu Liao,Zengjie Fan,Shengrong Yang
Conductive hydrogels with high flexibility, superior formability, good mechanical elasticity, and excellent biocompatibility have emerged as promising materials for broad applications in flexible/wearable electronic devices. In this work, a conductive dual-network PVA/SA/MXene hydrogel (PSM-h) composed of polyvinyl alcohol, sodium alginate, and MXene (Ti 3 C 2 T x ) is constructed by a green method without using chemical crosslinking agents. The resultant hydrogel with dual-network feature shows excellent cytocompatibility (no toxicity for human umbilical cord mesenchymal stem cells), high stretchability (up to 263%), and superior anti-fatigue ability (stretched up to 1000 cycles). More importantly, PSM-h based strain sensor presents good sensing sensitivity with a fast response time (62.5 ms) and a low detection limit even under a very slight strain of 0.2%. In terms of the practical application, the PSM-h based strain sensor can be applied to detect and distinguish various human motions.
研究领域:
材料科学
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生物医学工程
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Frontiers in Materials
·
2022
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IF 3.985
Mao Qiuyi,Zhu Bowen,Zhuang Hai,Bu Shoushan
A new prototype of hybrid silk fibroin and sodium alginate (SF-SA) based osteogenic hydrogel scaffold with a concentration of 2.5% magnesium phosphate (MgP) based gel was prepared with the assistance of an extrusion-based three-dimensional (3D) printing machine in this study. To determine the optimum ratio of MgP-based gel in the hydrogel, a series of physical and biochemical experiments were performed to determine the proper concentration of MgP in two-dimensional hydrogel films, as well as the cell compatibility with these materials in sequence. The SF-SA hydrogel with 2.5wt% magnesium phosphate (SF-SA/MgP) stood out and then was used to fabricate 3D hydrogel scaffolds according to the consequences of the experiments, with SF-SA hydrogel as a control. Then the morphology and osteogenic activity of the scaffolds were further characterized by field emission scanning electron microscope (SEM), calcium mineralization staining, and reverse transcription-polymerase chain reaction (rt-PCR). The SF-SA/MgP hydrogel scaffold promoted the adhesion of rat mesenchymal stem cells with higher degrees of efficiency under dynamic culture conditions. After co-culturing in an osteogenic differentiation medium, cells seeded on SF-SA/MgP hydrogel scaffold were shown to have better performance on osteogenesis in the early stage than the control group. This work illustrates that the 3D structures of hybrid SF-SA/MgP hydrogel are promising headstones for osteogenic tissue engineering.
研究领域:
生物医学工程
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组织工程
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材料科学
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细胞生物学
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高影响因子
ACS Omega
·
2021
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IF 3.512
Ting Liang,Biao Wang,Zhenzhong Fan,Qingwang Liu
CeO2 was synthesized by the co-precipitation method on the Cu mesh substrate and modified the surface of CeO2@Cu mesh by stearic acid (SA). The superhydrophobic behavior was ascribed to the combination of hierarchical micro–nanostructure of CeO2 and the hydrophobic alkyl groups from SA. The SA-CeO2@Cu mesh had antiacid and base stability and excellent durability as well as high separation efficiency. The separation efficiency can be up to 98.0% after separating 30 times.
研究领域:
材料科学
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环境工程
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shuai Liu,Mengmeng Jin,Jiaqiang Sun,Yongji Qin,Sanshuang Gao,Yu Chen,Shusheng Zhang,Jun Luo,Xijun Liu
Electrocatalytic CO 2 reduction reaction (CRR), powered by renewable energy sources, is a promising route to address energy and environmental issues. Herein, we fabricate single atomic Fe sites anchored on B and N co-doped carbon (Fe-SA/BNC), which showed excellent CRR activity, achieving a highest Faradaic efficiency of ∼ 94% at −0.7 V versus reversible hydrogen electrode. The performance is much better than that of the B-free sample. Furthermore, an outstanding current density of ∼ 130 mA cm −2 , as well as ∼ 99% Faradaic efficiency, has been achieved using the membrane electrode assembly (MEA). Details of density functional theory (DFT) calculations revealed that the introduction of B was beneficial for the desorption of *CO. The Zn-CO 2 battery was then assembled, which reached a high peak power density of 1.18 mW cm −2 at a current density of 4 mA cm −2 , as well as showing remarkable stability for CO production.
研究领域:
电化学
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材料科学
·
能源工程
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yulong Hu,Ruqiang Zhang,Xin Wang,Wentong Wu,Nanxing Chen,Yu Zhou,Xichao Liang,Guozhu Chen,Ling Yang,Wenjun Li
The growing demand for sustainable packaging has accentuated the urgent need for high-performance, environmentally friendly coatings. In this study, we proposed a low-cost and industrially applicable one-step dip-coating strategy that integrates poly(vinyl butyral) (PVB) with stearic acid (SA) to construct multifunctional coatings on bamboo fiber paper. PVB established hydrogen bonding with cellulose, forming a dense and continuous film that acted as a robust physical barrier and adhesive matrix. Concurrently, SA molecules interacted with PVB or cellulose through their carboxyl groups, whereas their long alkyl chains self-assembled during curing to generate hierarchical micro/nanostructures, thereby markedly reducing the surface energy. The synergistic interplay between PVB and SA produced a dual-repellent interface, in which PVB ensured film compactness and adhesion, whereas SA imparted pronounced hydrophobic and oleophobic characteristics. As a result, the modified bamboo fiber paper exhibited a high water contact angle of 136.41 ± 1.98°, an oil resistance grade of 12, and a tensile strength of 25.30 MPa─representing a 3.26-fold improvement over the unmodified substrate (7.76 MPa). This strategy demonstrated a facile, economical, and scalable route for producing multifunctional, eco-friendly paper coatings with substantial potential for sustainable food and medical packaging applications.
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Marine Drugs
·
2022
·Vol. 20
·期 8
·533
·
IF 6.085
Juanjuan Wang,Zebin Liu,Xiaowei Pan,Ning Wang,Legong Li,Yuguang Du,Jianjun Li,Mei Li
Fucoidans represent a type of polyanionic fucose-containing sulfated polysaccharides (FCSPs) that are cleaved by fucoidan-degrading enzymes, producing low-molecular-weight fucoidans with multiple biological activities suitable for pharmacological use. Most of the reported fucoidan-degrading enzymes are glycoside hydrolases, which have been well studied for their structures and catalytic mechanisms. Little is known, however, about the rarer fucoidan lyases, primarily due to the lack of structural information. FdlA fromFlavobacteriumsp. SA-0082 is an endo-type fucoidan-degrading enzyme that cleaves the sulfated fuco-glucuronomannan (SFGM) through a lytic mechanism. Here, we report nine crystal structures of the catalytic N-terminal domain of FdlA (FdlA-NTD), in both its wild type (WT) and mutant forms, at resolutions ranging from 1.30 to 2.25 Å. We show that the FdlA-NTD adopts a right-handed parallel β-helix fold, and possesses a substrate binding site composed of a long groove and a unique alkaline pocket. Our structural, biochemical, and enzymological analyses strongly suggest that FdlA-NTD utilizes catalytic residues different from other β-helix polysaccharide lyases, potentially representing a novel polysaccharide lyase family.Keywords:fucoidan lyase;polysaccharides;crystal structure;catalytic mechanism
研究领域:
生物化学
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结构生物学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 2.8
Xiaofang You,Yuxia Hou,Jingwei Wang,Lin Li,Meng He
This study aims to address the challenge of treating Pb 2+ in mining wastewater, a persistent issue in water environment pollution control. The sodium alginate/graphene oxide/polyethylene glycol (SA/GO/PEG) gel beads were designed and prepared with graphene oxide (GO), sodium alginate (SA), and polyethylene glycol (PEG) as raw materials by combining experiments and simulation. Firstly, the simulation system of SA/GO/PEG gel bead was constructed through molecular simulation, and the optimal composition of SA/GO/PEG gel bead was determined. The simulation results indicated that, with a PEG polymerization degree of 4000, the SA/GO/PEG gel bead system exhibited the greatest structural stability and the most effective cross-linked. Based on the understanding of the structure–performance relationship, SA/GO/PEG4000 gel beads were prepared to achieve an adsorbent with both high adsorption capacity and good stability. Characterization results indicated the successful cross-linked of polyethylene glycol with sodium alginate and graphene oxide, which not only introduced additional oxygen-containing functional groups and increased the crystallinity of the gel beads but, more importantly, led to the formation of a dense and complex three-dimensional network. This structure contributed to the improved thermal stability of the composite. Adsorption experiments showed that the adsorption of Pb 2+ onto SA/GO/PEG gel beads followed the Langmuir isotherm model. The calculated maximum adsorption capacities at 25°C, 35°C, and 45°C were 490.20, 497.51, and 526.32 mg/g, respectively. Furthermore, the gel beads exhibited excellent reusability, retaining 92.64% of their initial adsorption capacity after four consecutive adsorption–desorption cycles.
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