JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Zeyuan Liu,Zhansheng Li,Shouhai Zhang,Qian Liu,Zhaoqi Wang,Danhui Wang,Peiqi Xu,Shugang Xu,Han Jiang,Xigao Jian
The highly chlorine-resistant polyester-amide thin-film composite (TFC) nanofiltration (NF) membranes (PEA/PPBES) with specific layers incorporating phthalazinone moieties were prepared by interfacial polymerization. With the addition of 4-(4'-hydroxyphenyl)-2,3-phthalazin-1-one (DHPZ) to an aqueous phase of piperazine (PIP), and by using butanone as a co-solvent in the organic phase with trimesoyl chloride (TMC), the chlorine resistance and permeability of the PEA/PPBES membranes were enhanced simultaneously. When the co-solvent butanone was used, a distinctive ring-fold structure on the surface of the selective layer was observed, which could be the reason for the significantly improved the permeability of the PEA/PPBES membranes. With the addition of 3% butanone to the organic phase, the pure water flux (PWF) of the fabricated membrane was 118 L m -2 h -1 (0.5MPa), and the Na 2 SO 4 rejection reached 97.9%, increasing the water permeability by 2.6 times, compared to the control (without butanone). Additionally, the introduction of the phthalazinone moieties improved filtration performance at high temperatures as well as chlorine resistance. At an operation temperature of 95 °C, the water flux and Na 2 SO 4 rejection achieved 148.5 L m -2 h -1 and 96.4%, respectively. After a total NaClO exposure of 60,000 ppm h, the Na 2 SO 4 rejection and water flux changed slightly, demonstrating excellent chlorine resistance. This work offers a novel approach to fabricate TFC NF membranes with excellent chlorine resistance.
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高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Xiaolei Wang,Jingguo Zhang,Jing Feng,Shurui Han,Chan Huang,Zhiyun Kong,Huicai Wang
An organic solvent nanofiltration (OSN) membrane was fabricated through interfacial polymerization (IP) to form a selective layer containing hydrophilic amide (–CONH–) and hydrophobic trifluoromethyl (–CF 3 ) groups on a polyimide (PI) substrate. Piperazine (PIP) and 5-trifluoromethyl-1,3-phenylenediamine (TFMPD) were employed as aqueous phase monomers, reacting with trimesoyl chloride (TMC) in the organic phase. The effects of TFMPD incorporation on the chemical structure, morphology, surface properties, separation performance, and stability of the membranes were systematically investigated. The results revealed that the competitive reaction between TFMPD and PIP led to a thinner selective layer with reduced cross-linking degree, thereby enhancing solvent permeance while maintaining consistent pharmaceutical rejection. Specifically, the introduction of –CF 3 groups improved non-polar solvent transport, achieving a 3.2-fold increase in n-hexane permeance. After 91 days of immersion in N , N -dimethylformamide (DMF), the membrane retained ~94 % rifampicin (RFP) rejection and maintained an ethanol/water permeance of ~4.5 L·m −2 ·h −1 ·bar −1 . This work demonstrates a rational design strategy for developing solvent-resistant OSN membranes with balanced permeability-selectivity-stability for pharmaceutical separation in organic solvents.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Anteng Dai,Xu Chen,Hengyu Li,Zhangfeng Dong,Xiaoyun Chen,Qinghai Long,Bihong Lv,Zuoming Zhou,Guohua Jing
Solid-liquid biphasic solvents(SLBS) are considering as promising absorption for CO 2 chemical capture because of their potential energy-saving potential and easily separation of solid products. Nevertheless most of the SLB systems still with some defects, such as premature phase transition and viscous solid products. This work proposed a novel non-aqueous biphasic absorbent with controllable solid–liquid phase transition, composed of piperazine (PZ), 2-amino-2-methyl-1-propanol (AMP), and N-methylformamide (NMF). When NMF is 90 % by volume as solvent and the volume ratio of PZ and AMP is 3:1, the absorbent maintained a homogeneous phase with CO 2 loading below 0.729 mol/mol, which was about 60.6 % of the saturated loading (1.202 mol/mol). As the loading further increased, the solid products generated and the solution separated into solid–liquid two phases. And the solid product into the saturated solution was only 14 % of the total volume while contained about 93.29 % of total loading. The phase-transition mechanism was investigated by using 13 C NMR analysis and molecular simulations. Due to the higher reactivity of PZ with CO 2 compared to AMP, CO 2 initially reacted with PZ to form PZCOO − and PZH + . The enhanced polarity of the final products, PZ(COO − ) 2 and PZ(H + ) 2 , together with a marked increase in ESP difference, promotes the formation of small-volume, CO 2 -rich solids in the later stages of absorption. During this process, intermediate products (PZCOO − and PZH + ) interact with AMPCOO − and AMPH + , allowing early-stage dissolution of products in the solvent and ultimately producing easily separable solids with high CO 2 enrichment. The regeneration heat duty of the novel SLBS was estimated about 0.76 GJ/ton CO 2 , representing just 20.0 % of the industry standard for MEA (3.80 GJ/ton CO 2 ), which indicated extremely energy-saving advantage of the novel solvent.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Jun Wei,Xinyu Ma,Fengrui Yang,Shuwei Jia,Zhi Wang
Efficient separation of Mg 2+ /Li + is the key to extracting lithium resources from salt lakes. In this work, a symmetrical bis-quaternary ammonium salt (quaternized 1, 4-dimethylpiperazine, QDMPIP) monomer was synthesized and grafted to the surface of a polyamide nanofiltration membrane. By modulating the grafting amount of QDMPIP monomers, the membrane properties—including positive charge density, pore size, and hydrophilicity—were tailored. The surface of optimally QDMPIP-grafted membrane has a strong positive property, which can reduce Mg 2+ /Li + from 50 (feed) to 0.85 (permeate), and the corresponding S Mg2+/Li + reaches 58.5, which is 7.4 times that of the unmodified membrane. Remarkably, the flux remained comparable to the pristine membrane, while achieving a MgCl 2 rejection rate exceeding 93 % at 6000 ppm. In addition, the grafting of QDMPIP also improves the crosslinking degree of the membrane surface, which makes it have stable performance at complex operating pressures. Owing to its exceptional separation efficiency, high stability, and straightforward fabrication process, the QDMPIP-modified membrane demonstrates great industrialization potential in the extraction of lithium resources from salt lakes with a high Mg 2+ /Li + ratio.
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高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2025
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IF 2.3
Chungang Yuan,Zeyu Luo,Chunjiang Liu,Junhou Zhang,Liwei Zheng,Xiaoying Ma,Yujue Wang,Shiwei Guo
Solvent post-treatment is an effective strategy for regulating polyamide nanofiltration membranes. However, the regulatory mechanism behind this process requires further supplementation and improvement. In this study, different polar solvents (polarity order: acetonitrile > methanol > ethanol > acetone > n-butanol > n-hexane) were used for post-treatment of PEI nano-filtration membranes to compare and analyze the influence of solvent post-treatment on the performance of PEI nano-filtration membranes (flux, salt and heavy metal retention). Combined with the comprehensive physicochemical characterization (SEM, FTIR, XPS, contact angle), the regulatory mechanisms of different solvent post-treatments on PEI nanofiltration membranes were analyzed and summarized. The results revealed that the effect of solvent post-treatment on PEI-TMC polyamide is different from that of the MPD and PIP systems, possibly due to the larger molecular weight and acyclic molecular chain structure of PEI. Moreover, the solvent post-treatment mainly modulates the polyamide structure through two mechanisms: the swelling effect and the miscibility-promoted further reaction or hydrolysis. The former is the primary mechanism that determines the changes in separation properties. And the chemical structure of the polyamide surface is primarily influenced by the mutual dissolution promoted reaction or hydrolysis. This study improves the understanding of solvent post-treatment of interfacial polymerization and provides inspiration for performance modulation of positively charged PEI NF membranes.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Yaqi Zhang,Shiwei Tian,Qiankun Sha,Yixuan Wang,Xingxiang Zhang,Xuhuan Yan,Na Han
Nanomaterials have created many opportunities for the exploitation of novel thin-film nanocomposite (TFN) membranes. However, their poor compatibility at the organic-inorganic interface between the nanomaterials and the polyamide layers is still a challenge in hindering the development of TFN membranes. Herein, we firstly prepared a stable suspension of covalent organic frameworks (COFs) nanospheres as aqueous-phase nanofillers. The amino and hydroxyl groups in the COFs nanospheres form a large amount of hydrogen bonds with the piperazine molecules, the diffusion rate of the piperazine into the interface was reduced as a result, leading to the generation of thinner and more wrinkled polyamide layers. Furthermore, the exceptional dispersion characteristics of the COFs nanospheres contribute to reducing the number of defects in the resulting polyamide layer. Moreover, the intrinsic pore size of COFs provides rich channels for lowering the resistance for water molecules to transfer. These properties collectively enhanced the separation performance of the COF-doped TFN membranes, resulting in optimized COF-doped TFN membranes that exhibited a pure water permeance of up to 37.1 L‧m −2 ‧h −1 ‧bar −1 , with 99.0 % and 95.9 % rejection of Na 2 SO 4 and MgSO 4 , respectively. Furthermore, the membrane demonstrated remarkable efficacy in the separation of mono/divalent salts and mono/divalent anions, with S N a C l / N a 2 S O 4 and S C l − / S O 4 2 − values of 92.3 and 105.1, respectively. Additionally, the COF-doped TFN membrane exhibits consistent nanofiltration performance across a range of salt concentrations, a broad operating pressure range, and under prolonged operational conditions. Furthermore, the membrane exhibits excellent resistance to contamination. The outstanding performance of COF-doped TFN membranes paves the way for precise ion sieving in the field of water treatment, particularly in the related areas of seawater softening, brine refining, and salt mixture separation.
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APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Hanbin Wang,Wenshuang Zhang,Shiji Jia,Chongbin Wang,Yuanyuan Feng
Polyamide (PA)-based nanofiltration (NF) membranes often suffer from low water permeability and limited salt/dye separation efficiency due to dense selective layers. This work precisely regulated pore size by grafting azobenzene (Azo) and incorporating β-CD, which captures dyes via molecular recognition, enhancing dye/salt separation. The numerous hydrophilic hydroxyl groups present on the exterior of β-CD cavities improve membrane surface hydrophilicity, thereby optimizing the functionality of membrane surface. The contaminants adhering to membrane surface can be simply eliminated utilizing UV irradiation to disrupt the interactions between β-CD and Azo. More importantly, the membrane could then be reconstructed by re-immersing it in a fresh β-CD solution. The optimized membrane demonstrated a notable flux reaching 32.4 L/m 2 ·h·bar, along with an impressive CR/Na 2 SO 4 selectivity ratio of 220.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Xuan Wang,Tiantian Li,Zehua Li,Minghan Su,Shaofei Zhang,Fu Liu
Highly selective solute-solute separation remains a significant challenge for nanofiltration membranes, with the free-volume microstructure playing a critical role in determining perm-selectivity. This study presents a thin-film composite membrane fabricated through interfacial polymerization between bio-based ε -polylysine ( ε -PL) and triformyl chloride (TMC) for efficient dye/salt separation. ε -PL, with its unique molecular chain structure and steric hindrance, slows diffusion while maintaining adequate reactivity, promoting the formation of a selective layer with an optimal free-volume. In comparison to the small-molecule lysine used as an aqueous monomer, the polyamide membrane prepared with ε -PL exhibits a larger free-volume fraction (from 15.64% to 38.85%), enhanced pore connectivity, and a higher molecular weight cutoff. The optimized membrane demonstrates excellent performance, including high pure water flux (99.1 L·m -2 ·h -1 ), mixed solution permeate flux (58.1 L·m -2 ·h -1 ), and an impressive dye/salt separation factor (up to 597.8 for NaCl/Congo Red). The design strategy outlined here offers valuable insights for developing nanofiltration membranes with tunable pore structures, particularly for dye desalination applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yuan Li,Jixiang Dai,Linmeng Hong,Yan Guo,Danchen Zhu,Lijun Wu,Li-An Hou
Achieving precise and selective separation of ions with simultaneous settlement of the trade-off effect and membrane fouling is crucial but also challenging in membrane applications that involve the treatment of complex compositions. Motivated to tackle this problem, we developed a strategy for charge cascaded heterogeneous nanofiltration (NF) membrane utilizing MXene and glycine (Gly) intervened cetyl trimethyl ammonium bromide (CTAB). X-ray photoelectron spectroscopy (XPS) combined with Zeta potential determined that the stepwise deposition of functionalized materials produced a significant cascade effect on the charge distribution of the membrane active layer. Improved hydrophilicity and roughness, as well as dramatically reduced active layer thickness, enhanced the water permeability of the stacked heterogeneous membrane and harmonized the trade-off effect of the NF membranes. The positive–negative mixed internal channels, and the tuned pore size distribution enhanced ions rejection to 97% for Na 2 SO 4 and provided excellent selectivity for Cl − /SO 4 2− ion pairs, which was quantified at 20.3. Theoretical calculations showed that the free energy of adhesion of polar acid-base ( ΔG AB ) dominated the contribution to membrane fouling, and the functionalized membrane exhibited significant repulsion of foulants. Heterogeneous membrane demonstrate excellent efficiency in the advanced treatment of landfill leachate, achieving an 85% removal rate of chemical oxygen demand (COD) and ensuring compliance with discharge standards. Furthermore, through the synergistic effects of their antibacterial and anti-adhesion properties, the membranes significantly reduce the total biomass by 82.5%. This study adequately integrated the advantages of heterogeneous materials to achieve efficient enhancement of membrane transfer property as well as fouling mitigation in practical application.
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ACS Applied Materials & Interfaces
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2025
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IF 8.2
Qihang Wang,He Ren,Hongyang Ma,Shyam Venkateswaran,Benjamin S. Hsiao
An ultrathin nanofibrous composite nanofiltration (NF) membrane was developed through controlled interfacial copolymerization where an electrospun sulfonated poly(ether sulfone) (SPES) nanofibrous membrane serves as the substrate and 2,5-diaminobenzenesulfonic acid (2,5-DABSA) and piperazine (PIP) serve as aqueous phase monomers. The integration of the electrostatic interaction and hydrogen bonding between SPES nanofibers and PIP/2,5-DABSA triggered the controlled diffusion rate of monomers into the organic phase, resulting in the fabrication of an ultrathin polyamide barrier layer (∼56 nm). Additionally, a polyamide structure was created through the ternary interfacial copolymerization of PIP/2,5-DABSA and trimesoyl chloride (TMC), which offers high permeability to the composite NF membrane. Meanwhile, the −SO3H groups on 2,5-DABSA issued highly negative charges to the polyamide barrier layer, leading to a significant improvement in the rejection ratio against SO42– and fouling resistance against bovine serum albumin. The impact of 2,5-DABSA monomer on the cross-linking degree and pore size distribution of the polyamide barrier layer was investigated by optimizing the proportion of PIP and 2,5-DABSA monomers in the interfacial polymerization (IP) process. The ion selectivity and robustness of the composite NF membrane was determined and compared with conventional and commercial NF membranes comprehensively. Molecular dynamics simulations were conducted to demonstrate the mechanism of the controlled diffusion of monomers; the cross-linking degree and fractional free volume of the polyamide barrier layer were also evaluated. The NF-M(1:1) composite membrane exhibited a significant enhancement in the permeation flux as 137.4 L/m2·h at 0.5 MPa, which was 4 times higher than that of conventional NF membranes, while maintaining excellent divalent salt rejection against Na2SO4 at 99.4%, compared with 98.0% of the conventional NF membrane, effectively breaking through the trade-off effect in the long-term filtration performance.
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PubMed
高影响因子
AICHE JOURNAL
·
2025
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IF 4
Qiangbing Shi,Kaige Jia,Xiangping Zhang,Chuan Wang,Paul Cobden,Anna-Maria Beregi Amnéus,David Muren,Xiaoyan Ji
The development of advanced absorbents for effectively capturing carbon dioxide is crucial in mitigating greenhouse gas emissions. This study introduced a series of deep eutectic solvents (DESs) for CO 2 capture and identified the most promising DESs with the stepwise screening method based on their absorption capacity, absorption rate, thermal stability, desorption efficiency, and apparent activation energy. Consequently, compared to the monoethanolamine (MEA), in the 30 wt% aqueous solutions, [1,2,3-Triazolium chloride][diethylenetriamine] ([TrizCl][DETA]) and [Piperazinium chloride][diethylenetriamine] ([PzCl][DETA]) improved the CO 2 absorption capacities by 31% and 34%, absorption rates by 12% and 30%, and the amounts of CO 2 desorbed by 42% and 23%, as well as reduced the apparent activation energies by 9% and 28%, respectively. Meanwhile, their thermal stabilities (degradation onset temperatures, T onset ) were enhanced by 101% and 32%, respectively. The FTIR and NMR analyses were conducted to provide deeper insights into the chemical absorption mechanism of CO 2 by the DESs.
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FUEL
·
2025
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IF 7.5
Wenqian Song,Yuxin Wen,Guojun Kang,Wenqing Lv,Dekang Li,Haoquan Hu,Lijun Jin,Shijian Lu,Zhong Yan,Pengfei Liu
Amine-based solution absorption as the most promising and commercialized CO 2 capture method, attracted the increasing attention. However, its key lies in improving the CO 2 desorption performance while reducing the energy consumption in desorption. In this paper, HZSM-5 was dealuminated by sulfuric acid, further loaded by Fe 2 O 3 , Co 3 O 4 , NiO and ZnO via impregnation method and used in catalytic desorption of the blended amine solution of N-methyl-diethanolamine and piperazine. Results indicated that sulfuric acid leaching increased the number of acid sites and mesoporous surface area. When sulfuric acid reached 0.8 mol/L, the resultant catalyst (0.8H 2 SO 4 -HZ) improved the amount of the desorbed CO 2 by 10.26% and decreased the heat duty to 2128 kJ/mol CO 2 , with a reduction of 17.01% compared to non-catalytic system. The loading of metal oxides on 0.8H 2 SO 4 -HZ decreased surface area and changed acidity of catalysts. CO 2 desorption amount under catalysis of metal oxide modified M /0.8H 2 SO 4 -HZ followed the order of Fe/0.8H 2 SO 4 -HZ > Zn/0.8H 2 SO 4 -HZ > Ni/0.8H 2 SO 4 -HZ > Co/0.8H 2 SO 4 -HZ, whereas the relative heat duty was in order of Zn/0.8H 2 SO 4 -HZ > Co/0.8H 2 SO 4 -HZ > Ni/0.8H 2 SO 4 -HZ > Fe/0.8H 2 SO 4 -HZ. Fe/0.8H 2 SO 4 -HZ exhibited excellent catalytic performance, along with 12.82% increase in amount of CO 2 desorbed and reduction in heat duty to 2039 kJ/mol CO 2 , with a 20.49% decrease. Meanwhile, Fe/0.8H 2 SO 4 -HZ showed good stability after ten cycles and the addition of Fe/0.8H 2 SO 4 -HZ promoted CO 2 absorption. Suitable pore structure and abundant acid sites of the modified catalyst contributed to proton transfer and decomposition of carbamate. A possible mechanism for catalytic desorption over modified HZSM-5 was proposed. The work indicates that catalytic desorption by modified HZSM-5 catalyst is a promising way to decrease the energy consumption of amine solution regeneration.
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