Journal of Materials Chemistry A
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2022
·Vol. 11
·期 4
·1829-1840
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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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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
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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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PubMed
高影响因子
Current Research in Food Science
·
2022
·
IF 6.269
Fei Hu,Peng-Ren Zou,Fan Zhang,Kiran Thakur,Mohammad Rizwan Khan,Rosa Busquets,Jian-Guo Zhang,Zhao-Jun Wei
Poor solubility of wheat gluten proteins (WG) has negative impact on functional attributes such as gelation and emulsification, which limits it use in the food industry. In this study, WG underwent different degrees of phosphorylation using sodium tripolyphosphate (STP). Phosphoric acid groups were successfully incorporated in the WG via covalent bonding (C–N–P and C–O–P) involving hydroxyl and primary amino groups from WG. The introduction of phosphoric acid groups increased the negative charge of phosphorylation-WG, which caused the enhancement of electrostatic repulsion between proteins and reduced the droplet size in emulsions, thereby allowing proteins to be more efficiently dispersed in the solution system. The change of structure induced with phosphorylation improved hydration of protein, making the WG with higher solubility, thereby resulting in the improvement of its emulsification, foaming, thermal stability, and rheological properties. Therefore, WG can be modified by phosphorylation which caused an overall improvement of functional properties, thus facilitating the expansion of WG applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Rui Li,Shaochong Cao,Xiaoquan Feng,Jiayu Don,Xiaoxi Guo,Huixian Wang,Yatao Zhang
Loose nanofiltration membranes with high water permeance are desirable for the separation of dyes and salts; however, most membranes tend to be unstable when in contact with sodium hypochlorite solution, which has a significant influence on their properties. In this study, an innovative polymer membrane was fabricated on porous polyacrylonitrile substrates via interfacial polymerization, and a novel hydroxyl-containing guanidinium monomer (SaTG Cl ) were employed as an aqueous monomer. The fabricated polyester (PE) membranes exhibited high water permeance (97.2 L m −2 h −1 bar −1 ), high dye retention (99.4 %), and low salt retention (<15.8 %). Furthermore, the PE membranes exhibited exceptional molecular sieving for dye/salts or dye/dye mixtures. The SaTG Cl -based PE membranes displayed prominent chlorine resistance when soaked in aqueous NaClO. The PE membranes also exhibited distinct antifouling properties. Hence, the newly developed guanidinium-based PE membranes have enormous application prospects in dye purification. This work lays the foundation for the use of hydroxyl monomers in constructing thin-film composite membranes for various separations.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Jingxian Zheng,Rui Wang,Qisheng Ye,Baoliang Chen,Xiaoying Zhu
Precise interlayer spacing control and stability improvement had been two main challenges for preparation of high performance multilayered graphene based membrane (MGM). In this study, UV irradiation was adopted to precisely regulate and stabilize the interlayer spacing of a nanofiltration MGM. The UV irradiation on the GO suspension would homogenously and precisely tune the content of the oxygen containing groups on the rGO nanosheets , which should be responsible for uniformly formed interlayer spacing of MGM after assembly. The actual pore size of MGM was estimated through the probability density function model, which was highly uniform and logarithmically decreasing with the increasing UV reduction time. Owing to the uniformly and precisely (in sub-nanometer scale) controlled pore size of MGM, two molecules with a very low molecular weight difference at about 130 Da were completely separated by the MGM prepared from rGO reduced by UV for 8 h. The in-situ AFM nanoindentation as well as the long-term filtration test proved the stability of MGM was dramatically enhanced through the UV reduction and could ensure the practical applications of MGM. This study proposed a facial and scalable protocol to prepare high separation resolution multilayered graphene based NF membrane, which indicated great potential for separation of molecules with very close molecular weights in practical.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yanqing Xu,Guibing Peng,Wenfei Li,Yuying Zhu,Zhaohuan Mai,Natalie Mamrol,Junbin Liao,Jiangnan Shen,Yan Zhao
Kevlar aramid nanofibers (KANF) are formed by the nanoscale structure of poly (paraphenylene terephthalamide) chains and are the emerging candidate for organic solvent permeation. However, the KANF membranes have a highly ordered and compact structure with few nanofluidic channels, resulting in low-efficiency solvent transport and undesirable membrane filtration. Here, the aligned composite membranes were fabricated by assembling the amino-polystyrene nanospheres (APN) into the KANF matrix and finally obtained a series of the APN@KANF membranes. These APN disrupted the KANF chain packing and increased the fractional free volume (from 27.7 to 35.6%). The ethanol permeance of the APN@KANF membrane was six times higher than the KANF membrane and maintained its rejection performance. Experiments and molecular simulations indicated that these APN increased the pore interconnectivity, which enhanced solvent permeability and molecular sieving. In addition, these highly stable and rigid resulting APN@KANF composite membranes could be used in extreme polar aprotic and nonpolar environmental conditions. This work highlights a promising application of the APN@KANF membranes in organic solvent nanofiltration .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Zhiyuan Zha,Song Zhao,Guangqing Ma,Aaron S Pittman,Zhi Wang,Jixiao Wang
An amine-rich covalent organic framework (COF) membrane was firstly designed and fabricated through the interfacial polymerization (IP) of 3,3′-diaminobenzidine (DAB) and 1,3,5-triformylphloroglucinol (Tp) reactive monomers on polysulfone (PSf) substrate. The as-prepared TpDAB/PSf membrane displayed an ultra-high water permeability of ∼ 61 L⋅m −2 ⋅h −1 ⋅bar −1 and excellent dye/salt separation performance with 97.7% rejection of congo red and no rejection of MgCl 2 or Na 2 SO 4 . And then, small molecules with acyl chloride groups including sebacyl-chloride (SBC) or 1,3,5-trimellityl-chloride (TMC) were introduced to reconstruct the nanoporous structure of COF through intra-pore reaction with amine groups of the TpDAB separation layer. Although the TpDAB-SBC/PSf and TpDAB-TMC/PSf membranes exhibited reduced water permeability of ∼ 15 L⋅m −2 ⋅h −1 ⋅bar −1 , both showed high rejection or desalination performance toward small molecules, such as ≥ 95% dye rejection (Mw > 461.4 Da), ∼10% Na 2 SO 4 rejection and nearly no rejection of MgCl 2 . Therefore, a facile and rapid intra-pore reaction was feasible for reconstructing the nanoporous structure of amine-rich COF membranes to achieve tunable performance for the removal, purification and desalination of small molecules.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Kai Mi,Xingpei Ji,Sen Xiong,Yong Wang
Conjugated microporous polymers (CMPs) have great potential in membrane separation for their intrinsic microporosity and outstanding stability. Unfortunately, most CMPs are insoluble and infusible, thus it is very challenging to prepare CMPs membranes through conventional strategies. Herein, we report the molecular layer deposition (MLD) strategy to synthesize CMP thin films and their outstanding molecular sieving performances as nanofiltration membranes. Thanks to the gas-phase self-limiting reactions between volatile monomers during MLD, defect-free and large-area CMP thin films are deposited on porous substrates. The thickness of the CMP films is precisely tuned by the repeating MLD cycle numbers, and 100 MLD cycles result in a CMP thin film with the thickness of ∼ 70 nm. The as-prepared composite membranes with the deposited MLD thin films as the selective layers exhibit superior molecular sieving properties with a permeance up to 134 L m -2 h −1 bar −1 , outperforming other CMP membranes. In addition, the perm-selectivity of CMP membranes can be easily tuned by changing MLD cycle numbers. We further demonstrate that, by optimizing the deposition process including selecting proper precursors, CMP thin films can be successfully MLD-deposited onto temperature-sensitive polymeric substrates with the size as large as 10 cm × 10 cm. This work shows the feasibility and great potential of MLD synthesis of CMP thin films, which opens new avenues not only for the synthesis of CMPs with highly controllable thickness, but also for the preparation of advanced membranes for diverse applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Sihui Tang,Yuhao Chen,Hongbin Zhang,Tengfang Zhang,Peijian Wang,Haixiang Sun
Dye effluent is regarded as one of the most hazardous industrial effluents. Although loose nanofiltration (NF) membranes have been considered as an effective alternative technique for treating dye effluent, their development is still constrained by subpar permeance, separation efficiency and anti-fouling performance. In this work, a novel loose polyamide (PA) NF membrane was designed employing a conventional interfacial polymerization process using piperazine-2-carboxylic acid (PIP-COOH) and trimesoyl chloride as aqueous and organic phase monomers, respectively. The presence of unique electron-absorbing carboxyl groups on the PIP-COOH monomer not only provided abundant negative charge on the membrane surface, but also greatly reduced the reactivity, diffusion rate and solubility in n-hexane of the aqueous monomer, allowing for the formation of a more relaxed and smoother active layer. The balanced combination of pore size screening and Donnan effect achieved precise separations with high permeability. Moreover, the interaction of the carboxyl groups with the backbone structure increased the free volume of the PA layer and improved permeability significantly. The PIP-COOH/TMC membrane prepared under the optimal conditions exhibited high water permeance of 598.1 L·m −2 ·h −1 ·MPa −1 , high reactive red rejection (99.3%) and low NaCl rejection (5.4%). Furthermore, the membrane possessed exceptional anti-fouling performance thanks to the ultra-smooth surface with crucial antifouling index flux recovery ratio as high as about 99%, which showed unexpected application possibilities. In conclusion, this study offers a potential novel membrane material for the development and application of loose NF membranes in the treatment of colored effluent.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yue Zhang,Kongyin Zhao,Zhenhao Yang,Zhijian Zhang,Zhilong Guo,Rongrong Chu,Wei Zhang,Wenxiong Shi,Jiacheng Li,Ziyi Li,Haiyi Liu,Anhou Xu,Xi Chen
Calcium alginate (CaAlg) hydrogel has good anti-pollution performance. However, the self-supporting CaAlg hydrogel filtration membrane is difficult to be batch prepared due to its poor mechanical properties. In this paper, polyester (PET) non-woven fabric, polypropylene (PP) non-woven fabric and polyhydroxybutyrate (PHB) nanofibers were used as support layer to prepare CaAlg composite membranes. A series of studies proved that CaAlg-PET membrane showed higher stability and flux, which revealed that PET non-woven fabric was the best carrier among the three fiber carriers to enhance the various properties of hydrogel. Methyl blue (MB) and sodium chloride (NaCl) were used as the representatives of molecules and ions, respectively. The effects of concentration, operating pressure and temperature on the separation performance of MB/NaCl by CaAlg-PET membrane were investigated. The flux of CaAlg-PET membrane was 19.3 L·m −2 ·h −1 ·bar −1 , and the membrane showed a high selectivity of 183.4 to MB/NaCl mixture (99.5% rejection of MB and 8.3% rejection of NaCl). Moreover, Barium ion was used to cross-link sodium alginate to prepare barium alginate (BaAlg) hydrogel coated composite membrane (BaAlg-PET) using PET fiber as the carrier. The BaAlg-PET membrane exhibited higher strength, stability, flux and better separation performance than CaAlg-PET membrane. BaAlg-PET membrane exhibited a high flux of above 35.5 L·m −2 ·h −1 ·bar −1 , and the molecular ion selectivity was 306.3 (99.7% rejection of MB and 8.1% rejection of NaCl). Membrane pore structure and pore size distribution of BaAlg hydrogel membrane were generated by molecular dynamic (MD) simulations. In sum, this work provided a green, economical and expandable new idea and membrane material for the separation of molecules and ions.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xiaojuan Zhang,Edouard Asselin,Zhibao Li
The precipitation of CaCO3 and its kinetics for the CaCl2–CO2–Mg(OH)2–H2O system were systematically studied to develop a novel process for eliminating solid and liquid waste from the Solvay soda process. The effects of operating conditions including temperature, CaCl2 concentration, flow rate of CO2, and stirring speed on the reaction kinetics were experimentally determined. The results revealed that low temperature, high CO2 flow rate, and fast stirring speed can accelerate the reaction rate, and the mass transfer of CO2 is the controlling step. An MSMPR crystallizer was used to obtain the experimental crystal size distribution (CSD). A simplified population balance equation (PBE) was used to correlate the parameters on the basis of supersaturation. The soda solid and liquid wastes discharged from the Solvay industry were used as raw material to test the new process and validate the methodology. The precipitated CaCO3 consists of calcite or aragonite with high purity and uniform CSD. A double-effect evaporative-cooling crystallization process to recover MgCl2·6H2O and NaCl was simulated with help of Aspen plus and the electrolyte-NRTL (ELENRTL) model, suggesting economic benefits.
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危险品化学品经营许可证（带存储）