Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121939
·
IF 7.5
Yu Liu,Jinhai Xu,Shusu Shen,Xiaoji Zhou,Dapeng Liu,Ganwei Zhang
The development of photocatalytic self-cleaning membranes represents a promising strategy for addressing membrane fouling in dye wastewater treatment. NH 2 -MIL-88B(Fe) (NM88B) possesses excellent chemical stability, hydrophilicity and inherent photocatalytic activity, its practical application is limited by the low carrier mobility and the rapid recombination of photogenerated electron-hole pairs. In this experiment, NM88B@TiO 2 was synthesized by in-situ growth method, and was constructed to enhance charge separation and photocatalytic efficiency, and then NM88B@TiO 2 /polyvinylidene fluoride (PVDF) mixed matrix membranes (MMMs) were fabricated using the non-solvent induced phase separation (NIPS) method. The loading capacity of NM88B@TiO 2 could reach up to 2 %. The optimal membrane has a porosity of 86.02 %, which is 63 % higher than that of the original PVDF (52.78 %). The pure water permeability of the optimal membrane is 52.87 L·m −2 ·h −1 ·bar −1 , 2.5 times that of the original membrane. The water contact angle decreased from 85.6° to 40.4°, making the membrane highly hydrophilic. In the anti-BSA fouling experiment, the flux recovery rate (FRR) of the optimal membrane still maintained above 75 % even after 6 cycles, demonstrating excellent antifouling ability and also reusability. Moreover, the membrane showed a good rejection rate for various dyes. Additionally, this membrane exhibited excellent photocatalytic self-cleaning ability. After 7 photocatalytic self-cleaning cycles, the membrane permeability basically returned to its initial state, and the membrane maintained a good CR rejection rate (>90 %). During the continuous 72-hour CR filtration process, the permeability and rejection rate remained unchanged. These results highlight the potential of the NM88B@TiO 2 modified PVDF membrane as a photocatalytic self-cleaning membrane for treating wastewater containing dyes.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121235
·
IF 7.2
Na-won Baek,Shin-hee Lee
This study presents a novel enzyme-assisted coagulation (EAC) system as a low-carbon, energy-free strategy for the efficient treatment of azo dyes in textile wastewater. The EAC system integrates enzymatic oxidation with natural polymer-based coagulation and operates effectively under mild conditions without external energy input. Using horseradish peroxidase (HRP) and chitosan as model components, the system was applied to three representative azo dyes—Allura Red, Eriochrome Black, and Sunset Yellow—achieving decolorization efficiencies exceeding 98 %. Analytical techniques, including UV–Vis spectroscopy, FTIR, HPLC, and GC–MS, confirmed effective dye degradation and the stable aggregation of byproducts. The EAC mechanism involves the dual functionality of chitosan, which initially acts as an adsorbent and flocculant to enhance enzyme accessibility and subsequently serves as a stabilizing matrix that immobilizes and facilitates the removal of degradation products. This synergistic interaction between HRP and chitosan offers an efficient, biodegradable, and environmentally friendly approach for sustainable dye wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Ye-Heng Su,Rui Han,Zhen-Liang Xu,Sen Wang,Jian-Xiong Xu,Zi-Qi Sun,Sun-Jie Xu
Ionic covalent organic frameworks (iCOFs) are promising materials for nanofiltration (NF) due to their ordered nanochannels and permanently charged pore surfaces. However, the introduction of ionic groups may affect the crystallization behavior and membrane assembly, which can make the construction of continuous iCOF membranes more demanding. In this work, Chitosan-assisted interfacial diffusion (ID) strategy was developed to fabricate continuous TpPa-SO₃H iCOF membranes on porous nylon substrates. The pre-deposited chitosan establishes a stabilized interfacial environment and facilitates the formation of a continuous selective layer with reduced defects. Structural characterizations confirm that chitosan effectively improves membrane continuity and suppresses interfacial defects. The optimized membrane achieves a high pure water permeance of 223 L·m −2 ·h −1 ·bar −1 with a Congo red (CR) rejection of 98.6% and low salt rejection (<10%), demonstrating excellent dye-salt separation performance.
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DESALINATION
·
2026
·
IF 9.9
Nian Zhang,Jing-Feng Chen,Chen Peng,Dong Yu,Chen-Jie Wei,Li-Fen Liu
A novel Tröger's base-based diamine monomer-4,4′-(6H,12H-5,11-methanodibenzo[b,f][1,5]diazocine-2,8-diyl)dianiline (DAPTB) was designed and prepared. • The novel DAPTB decorated polyamide thin film composite nanofiltration (TFC NF) membrane was fabricated. • The M DAPTB-TMC NF membrane showed a water flux that was 4.54 times higher than that of the M PIP-TMC membrane, and precise dye/salt selectivity. • The M DAPTB-TMC NF membrane showed excellent durability under strong acidic environments. • The rejection for EBT still remained over 99% after 63 days of static soaking in 20 wt% H 2 SO 4 solution. For efficient dye/salt separation, particularly under strongly acidic conditions, the limited acid stability of traditional polypiperazine-amide thin film composite nanofiltration membrane (M PIP-TMC TFC NF) poses a significant challenge, as the piperazine-amide bonds are susceptible to hydrolysis, resulting in pronounced performance deterioration. Optimizing the chemical composition of loose NF membranes offers a promising strategy to overcome this limitation by simultaneously enhancing selectivity and permeance. In this study, a novel kind of wholly Tröger's base-based diamine monomer was developed and a Tröger's base-based polyamide TFC NF membrane was successfully fabricated through sequential non-solvent induced phase separation (NIPs) method and in situ interfacial polymerization (IP) reaction. Compared with the conventional M PIP-TMC NF membrane, the novel diamine monomer 4,4′-( 6H,12H -5,11-methanodibenzo[b,f][1,5]diazocine-2,8-diyl)dianiline (DAPTB) which decorated with linear, rigid, and twisted structure endowed the obtained M DAPTB-TMC NF membrane with a more loosely packed separation layer. Meanwhile, the M DAPTB-TMC NF membrane showed high water permeability of 26.15 L·m −2 ·h −1 ·bar −1 , which was 4.54 times higher than M PIP-TMC membrane. Furthermore, the membrane achieved exceptional rejections including 99.8% for eriochrome black T (EBT), and 99.2% for congo red (CR), accompanied by low Na₂SO₄ rejections of approximately 7.17% and 1.01%, respectively. Especially, the M DAPTB-TMC membrane demonstrated outstanding acid resistance, maintaining a high EBT rejection of 99.5% and a stable permeance even after 60 days of immersion in 20 wt% H₂SO₄, demonstrating the great potential for NF separation applications in the strong acidic conditions in the future. Download: Download high-res image (335KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Qian Liu,Tengfei He,Cheng Yi,Chunhong Zhang,Lijia Liu,Chao Wang
Covalent organic framework (COF) membranes with high porosity and ordered channels possess significant potential for the removal of organic micropollutants from wastewater, offering ultrafast water permeance. This study developed a novel COF-based composite membrane to improve the selectivity of dye/salt separation. The COF layer was initially fabricated via interfacial polymerization using 1,3,5-triformylbenzene and m -phenylenediamine on the hydrolyzed polyacrylonitrile (HPAN) substrate. Subsequently, an in situ grown metal-phenolic network (MPN) layer was formed on the COF layer through the complexation reaction between epigallocatechin gallate (EGCG) and Cu 2+ . The combination of the Cu-EGCG-based MPN layer and the COF layer enhanced the compactness, charge properties, and wettability of the selective layer, thereby improving dye rejection while maintaining relatively low salt rejection. The resulting membrane exhibited rejections of 98.8% for Congo red (CR) and 11.6% for NaCl, with a water permeance of 50.6 L m −2 h −1 bar −1 . In addition, the fabricated membrane exhibited separation stability in the long-term filtration process and demonstrated satisfactory regeneration performance after repeated filtration and cleaning with aqueous ethanol. This work demonstrates an effective post-modification approach for tuning the separation performance of COF membranes.
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INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Ronghan Jiang,Tiancun Liu,Yaling Ji,Xueqin Zhang,Song Lu,Anyi Lyu,Xusheng Wang,Jiaqi Fan,Min Guo,Jiadi Ying,Qi Shen,Yeqing Wang,Yong Wang,Zhixin Yu
Aqueous zinc-ion batteries (AZIBs) face challenges such as dendrite growth and byproduct accumulation in practical applications. Herein, an innovative strategy of alkali corrosion is utilized to tune crystal facets of a Zn electrode, selectively weakening the active (101) plane and highlighting the (002) plane. Furthermore, a protective interface composed of coordination polymers and inorganic zinc compounds has been synchronously fabricated, exhibiting remarkable mechanical robustness. The engineered multifunctional protective layer (MPL) also possesses abundant zincophilic sites that can significantly promote the uniform Zn ion distribution on the interface and demonstrates remarkable efficacy in improving corrosion resistance, inhibiting dendrite formation, promoting uniform zinc deposition, and significantly enhancing the cycling performance of AZIBs. Therefore, the symmetric cell with Zn@MPL exhibits superior cycling stability over 5000 h at 0.5 mA cm–2 and excellent rate performance at 10 mA cm–2. When cycled for 2300 cycles, a full cell using Zn@MPL and MnO2 can still deliver a capacity retention rate of 51.4% at 5 A g–1, which is 24 times longer than the cycling lifespan of the bare Zn-based cell decaying to the same capacity. The successful preparation and application of a unique MPL provide some new insights for exploring safe and stable AZIBs.
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高影响因子
DESALINATION
·
2025
·
IF 9.8
Liu-Yang Gong,Nian Zhang,Jun-Yan Yu,Yan-Nan Wu,Chen-Jie Wei,He-Lin Zhu,Xue-Li Cao,Li-Fen Liu
The conventional polypiperazinamide thin film composite (TFC) nanofiltration (NF) membrane is easy to lose its separation performance under strong acidic conditions due to the hydrolysis of piperazine-amide bonds. In order to break through the bottleneck, in this study, a novel methane-free Tröger's base diamine monomer was proposed for fabricating high-performance polyamide thin-film composite nanofiltration (TFC NF) membranes. Firstly, the novel 3,3′-diamine-Tröger's base (DATB) monomer was synthesized and added into the polyethersulfone solution to fabricate the polyamide TFC NF membrane via non-solvent induced phase inversion (NIPs) followed by interfacial polymerization (IP). Thereinto, the DATB based NF membrane prepared with 1.0 wt% DATB and 0.075 w/v% TMC exhibited favorable rejection to Na 2 SO 4 (98.1 %) under neutral conditions, as well as high rejection to heavy metal ions at pH 1 (99.6 % of Fe 3+ , 97.3 % of Ni 2+ and 96.7 % of Cr 3+ ) and good selective separation factors (68.6 of Fe 3+ /H + , 31.8 of Ni 2+ /H + and 25.8 of Cr 3+ /H + ). Meanwhile, this membrane showed high rejection to dyes at pH 1 such as 99.1 % for crystal violet (CV), 99.5 % for rhodamine B (RDB), 96.4 % for eriochrome Black T (EBT), and 99.3 % for congo red (CR), respectively. Especially, the DATB based NF membrane had excellent acid resistance, and its rejection of Na 2 SO 4 only decreased by 8.8 % and remained >89.3 % after soaking in 20 wt% H 2 SO 4 solution for 30 days. Interestingly, this NF membrane also showed good antifouling property, and its water flux always did not decrease during the recovery of FeCl 3 at pH 1. Obviously, the distinct V-shaped rigid TB configuration concurrently provided the DATB-derived nanofiltration membrane with excellent resistance to acids, enhanced selectivity, and antifouling performance. This study offers a promising strategy for manufacturing TFC NF membranes with enhanced acid stability and performance.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Huacun Li,Mingbo Xie,Zhenghao Wang,Jinkang Liu,Jun Xie,Xu Yan,Qingwei Wang,Meiqing Shi,Liyuan Chai,Liyuan Zhang
Graphene oxide membranes hold promising application potential in molecular nanofiltration, but the traditional selectivity-permeability trade-off is still a challenge. Here, an interfacial redox reaction strategy based on poly(m-phenylenediamine)-graphene oxide (PmPD-GO) interaction was successfully designed to achieve the fabrication of an ultrathin graphene oxide membrane (∼28 nm) with a reasonable reduction state (C/O ratio of 11.2) and adequate interlayer spacing stabilized at 8 ± 0.5 Å, which supplies not only a favorable microenvironment for fast water transport but also a suitable interlayer distance for molecules gating. The resultant membrane exhibits a high permeance of 72 LMH/bar and an exceptional dye rejection rate exceeding 98%. Moreover, the gentle gradient-reduced graphene oxide membrane has significantly improved stability under long-term immersion, pH tolerance, and ultrasonic treatment tests. This research provided a simple and effective strategy for fabricating two-dimensional lamellar membranes with promising prospects for practical nanofiltration applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Jiahui Li,Zhongrui Chen,Jianhua Zhang,Ziping Song,Hongjin Yan,Haoyu Zhan,Qijia Han,Yunbo Zheng,Xiaojia Zheng,Hao Zhang,Quan Kang,Chunrui Wu
Exploring novel aqueous monomers to construct loose nanofiltration (LNF) membranes with excellent permeability and dye/salt selectivity is still needed for recovering resources in textile wastewater. In this study, a novel strategy for exploiting the differential N-site reactivities in 4-aminobenzoylhydrazine (4ABH) was proposed to precisely modulate the structure of the polyamide (PA) layer, thereby fabricating unique LNF membranes. The nucleophilic reactivities of 4ABH monomer and their effect on the PA layer formation were studied via density functional theory (DFT) and molecular dynamics simulation (MDS), which provided theoretical guidance for understanding the formation mechanism of LNF membranes. Based on the differential nucleophilic reactivities of N-sites in 4ABH (-NH₂ > -NH 2 of -NH-NH₂ > -NH- of -NH-NH₂), the proportion of large cavities within the PA cross-linked networks increased, and then the compact cross-linked structure emerged as the monomer concentration increased. The experimental result demonstrated that the optimized 4ABH/TMC LNF membrane exhibited a high water permeability of 45.03 L·m -2 ·h -1 ·bar -1 , while maintaining excellent rejection for methyl blue (MB) (95.18%), eriochrome black T (EBT) (99.24%) and congo red (CR) (99.64%) with a low salt rejection for Na₂SO₄ (24.37%), MgSO 4 (7.03%), NaCl (6.79%), and MgCl 2 (3.29%). Moreover, the membrane achieved a selectivity factor of 239.00 for CR/NaCl in dye/salt mixture solutions and showed robust stability and fouling resistance in continuous filtration tests. The strategy explored in this work provided a new insight into selecting suitable aqueous monomers for preparing the unique LNF membranes with excellent permeability and dye/salt selectivity.
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 1
·1-14
·
IF 2.5
Wang Chuanfeng,Chen Yingbo,Wang Meng,Guo Renhao
A dual-layer (DL) PVDF loose nanofiltration (NF) hollow fiber membrane (HFM) was designed via optimized phase inversion process using a continuous online-coating device. Subsequently, the loose DL PVDF HFM was cross-linked through a one-pot amine-based reaction to improve the solvent stability. Changes in chemical structure were characterized using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscope (XPS). The solvent stability in DMF of the membranes with different cross-linking time was investigated through measuring swelling ratio of the membranes. In addition, thermogravimetric analysis (TGA) and mechanical property were also conducted to study physico-chemical changes of the cross-linked DL PVDF hollow fiber membranes. The results showed that this cross-linking process significantly improved the stability in polar solvent, accompanied by a decrease in thermal stability and mechanical properties. A cross-linking time of 8 h was found to produce DL PVDF HFMs with most balanced properties. The performance of cross-linked membranes was evaluated via filtering various solutes in ethanol solution and typical solvents containing Rose bengal (RB). The cross-linked DL HFMs showed rejection of RB more than 99% in solvent with methanol, ethanol, isopropanol, and acetone and permeance of 9.3, 7.6, 5.2, and 8.7 L/(m 2 ·h·bar), respectively. Besides, the prepared membranes also presented exceptional performance stability for treatment of RB/ethanol solution. Thus, they have great potential for real organic solvent nanofiltration applications.
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Nanoscale
·
2022
·Vol. 14
·期 47
·17670-17680
·
IF 8.307
Guitu Wang,Jingyu Lu,Chuanjie Fang,Wenzhang Fang,Xinsheng Peng,Hongbo Zeng,Liping Zhu
Metal–organic framework (MOF) nanosheets have significant potential applications including separation, catalysis, and sensors. However, the on-demand design with tunable thickness and morphology remains a great challenge, leading to difficulties in modulating their hierarchical assembly for the preparation of macroscopic films. Herein, we report the successful synthesis of smooth and ultrathin MOF (Cu-TCPP (TCPP = 4,4,4,4-(porphine-5,10,15,20-tetrayl)tetrakis(benzoic acid))) nanosheets used in lamellar nanofilms for the rejection of organic molecules from water. Dopamine hydrochloride (DA-HCl) is used as an adjuvant in the synthesis. Facilitated by a HCl acid environment and DA competitive coordination, the normal and lateral growths of Cu-TCPP nanosheets are modulated to achieve the desired thickness and morphology. DA-HCl can be also easily removed from the nanosheets without affecting their physicochemical properties. The as-synthesized nanosheets are utilized as nanofilm building blocks in which they are stacked into ordered bricks. The obtained membrane displays an ultrahigh water permeance of 2540 L m−2 h−1 bar−1, which is two orders of magnitude higher than the currently reported polymer membranes, while it does not sacrifice the solute rejection as completely determined by the intrinsic pore size of the nanosheets (i.e., 98.8% for molecules larger than 1.3 nm). This work provides a novel and facile strategy to tailor the morphology of the MOF nanosheets for maximizing their functionalities and structure superiority in many engineering applications.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 4
·1829-1840
·
IF 14.511
Yan-Li Ji,Kai Zhang,Jin-Lin Wang,Zhuang-Zhuang Liu,Xin Wen,Cong-Jie Gao
Porous organic polymer (POP) membranes show great promise for the precise separation of organic molecules and salt ions due to their high porosity, tunable pore aperture, and robust porous structure. However, their application is hindered by the poor processability of POPs and complicated and uncontrollable membrane preparation. Herein, we report a nanoparticle-polymer reticulation (NPR) strategy by bridging POP nanoparticles for the fabrication of POP nanochannel membranes with a relatively large area (>700 cm2). A new type of water dispersible and processible triazine porous organic polymer (TPOP) nanoparticles was synthesized via the facile and straightforward Debus–Radziszewski reaction. Chitosan (CS) macromolecules as the bridge tied the self-assembled TPOP nanoparticles into a thin film via in situ chemical cross-linking on a polymeric porous substrate, wherein the resultant film thickness, pore size and separation performance could be conveniently tuned. The NPR strategy enabled the construction of an ultrathin and continuous nanochannel TPOP-CSM membrane, presenting both a high water permeance of ∼130 L m−2 h−1 bar−1 and dye/salt selectivity of ∼35, which is one order of magnitude higher than that of conventional polymeric nanofiltration membranes. Meanwhile, the membrane exhibited good fouling resistance and antibacterial properties in an aqueous environment. Our strategy may provide a paradigm shift in engineering POP nanomaterials and constructing next-generation advanced separation membranes.
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