SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Jiao Meng,Yan Xie,Yi-Hang Gu,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Novel polyvinylidene fluoride-calcium alginate (PVDF-CaAlg) nanofiltration (NF) membranes were prepared by impregnating electrospun PVDF substrates with sodium alginate solution and crosslinking with CaCl 2 solution. The NF membranes were characterized via field emission scanning electron microscopy (FESEM) equipped with an energy-dispersive spectrometry (EDS), attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The results show that the prepared PVDF-CaAlg NF membranes exhibit dual thin-film-composite (TFC) structure and superior surface hydrophilicity. The highest pure water flux can achieve 63.8 L·m −2 ·h −1 ·bar −1 accompanied with a 98.5% rejection rate for methyl blue (MB), which is superior to many polymeric NF membranes. The prepared PVDF-CaAlg NF membranes exhibit much higher rejections for seven typical dyes, and the rejection slightly rises with the increase of impregnating time. In the long-term filtration process, the permeation flux for dye solution remains stable. PVDF-CaAlg NF membranes show good anti-fouling performance to BSA protein and lactobacillus.
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高影响因子
DESALINATION
·
2020
·
IF 7.098
Kai Zhang,Kang Yang,Yingbo Chen,Yunxia Hu
Ionic and pH responsive thin film composite (TFC) membrane is prepared by interfacial polymerization of lysine and trimesoyl chloride on the out surface of poly ( m -phenylene isophthalamide) hollow fiber membrane . Hydrophilicity and strong negative charge of the TFC membrane are obtained by introducing a large amount of carboxylic groups in the cross-linked polyamide network, endorsing the ionic and pH response of the TFC membrane in terms of flux and rejection. The TFC membrane shows almost 100% rejection for Eriochrome black T, with a flux of 35.8 L/m 2 h (0.2 MPa) at low pH and salt concentration . However, the rejection decreases to 95.8%, and the flux increases more than three times at high pH and salt concentration due to the shift of the interaction in the polyamide network from hydrogen bonding to static-electric repulsion. The responsive TFC membrane also shows great performance in separation of dye-salt mixture and dye mixture.
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JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Yanqing Xu,Suyang Yu,Guibin Peng,Arcadio Sotto,Huimin Ruan,Jiangnan Shen,Congjie Gao
Organic solvent nanofiltration (OSN) membranes have gained increasing attention for their wide applications in organic phase system. However, the fabrication method rather than the swelling behavior receives more attention during the OSN testing. In this work, a thin-film composite membrane with an internal cross-linking network by reacting 4,4-bipyridine with brominated poly (2,6-dimethyl-1, 4-phenylene oxide) (BPPO) has been prepared for organic solvent nanofiltration (OSN). The bipyridine groups substituted on the polyphenylene oxide polymer backbone act as cross-linkers and cationic channels for remarkable chemical stability and high solvent permeability. The permeability of the cross-linked BPPO (CBPPO) thin-film membranes exhibited high related to the viscosity and solubility parameter of solvents. The stability of CBPPO membrane was studied via various organic solvent immersing experiments. The result demonstrated that the composite membrane swelling changed to an extent of no more than 2.01%. It can be attributed to the low conformational flexibility of polymer chains with a high crosslinking degree. The ethanol permeation and dye rejection were compared before and after soaking. The calculation of the MWCO and membrane potential of modified CBPPO membranes showed that the swelling behavior of the CBPPO composite membranes is mainly affected by the membrane charge densities rather than the pore size.
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Journal of Materials Chemistry A
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2020
·Vol. 8
·期 8
·4505-4514
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IF 11.301
Qianqian Yu,Xinda You,Hong Wu,Yanlei Su,Runnan Zhang,Yanan Liu,Chao Yang,Jianliang Shen,Jinqiu Yuan,Zhongyi Jiang
Amphiphobic fluorine materials hold great promise for fabricating self-cleaning membranes. However, the severely impeded water transport in hydrophobic fluorine-based membranes and the weak interaction with the substrate of the low-surface-energy fluorine materials represent two major obstacles for efficient water purification. Herein, we design an ultrathin fluorine-based membrane via coordination-driven metal-bridging assembly. An Fe3+-rich metal–organic layer is constructed on a porous substrate by coordination between polyphosphate ligands and Fe3+ ions, accompanied by the assembly of perfluorosulfonate polymer ligands (Nafion®) via the bridging effect of Fe3+ ions for the metal-bridging fluorine-based membrane (MBFM). By virtue of the flexible modulation of Fe3+ and unique self-assembly of Nafion®, a defect-free 58 nm-thick MBFM featuring an ultrahigh surface fluorine content (47.6 at%) and underwater superoleophobicity (∼160°) is achieved, which displays a superior water permeance of 125.2 L m−2 h−1 bar−1 (2–10 times higher than that of state-of-the-art membranes with dye rejections above 90%) and versatile resistance towards both spreading and non-spreading foulants (flux decline ratios below 8%). This metal-bridging assembly strategy may shed light on advanced membrane fabrication from rationally designed ligands and functional moieties.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Wenbo Liu,Chuanbin Fan,Ziao Zong,Nana Li,Kaixuan Ma,Bin Zhu,Xia Zhang,Yuhua Fan
Two novel Co(Ⅱ)-MOFs synthesized under solvothermal conditions, namely [Co 3 (L) 2 (bimb) 2 (H2O) 2 ] n ( OUC-1 ) and [Co 2 (L)(OH)(H 2 O) 2 ] n ( OUC-2 ) (bimb = 1,4-bis(lmidazol)butane, H 3 L = 3-(3,5-dicarboxylphenoxy)-5-carboxylpyridine), were used to remove Congo Red and Orange Ⅳ from aqueous environment, respectively. The influential parameters of the temperature and pH of solution, initial dye concentration, the structure and charge of dye on the adsorption performance were investigated. It is found that the dye with proper structure (i.e. organic groups favorable for adsorption, such as -NH 2 , -SO 3 H, etc, proper distance between the groups, linear structure and more benzene rings), richer negative charges, smaller molecular weight facilitates faster adsorbed. The intermittent operation experiments were adopted to make the adsorption isotherm and kinetics data of OUC-1 and OUC-2 accurately described by Langmuir isotherm and pseudo second-order kinetics. The intra-particle diffusion model indicates the adsorption process is controlled by the intra-particle diffusion and other adsorption stages. Two adsorbents release azo dyes easily through simple organic solutions and maintain high adsorption capacity after 8 cycles. Moreover, OUC-1 and OUC-2 also exhibit high adsorption performance in artificial seawater. The mechanism of selective adsorption involves pore filling, π-π stacking interaction, hydrogen bond and electrostatic interaction.
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CHEMISTRY OF MATERIALS
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2021
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IF 9.811
Kai Li,Junyong Zhu,Decheng Liu,Yatao Zhang,Bart Van der Bruggen
Conjugated microporous polymers (CMPs) featuring a well-structured microporosity are desirable molecular sieving materials, but most are fabricated under harsh synthesis conditions (e.g., high temperature and pressure) and are insoluble, which is challenging for processing them into continuous membranes. Herein, in situ formation of imine-linked, 31-nm-thick CMP nanofilms supported on porous polymeric substrates via catalysis diffusion-controlled interfacial polymerization (IP) under mild conditions is reported. The diffusion of catalyst acetic acid (AcOH) from the water phase to the interface enables acceleration of the aldehyde-amine condensation from the oil phase and thus the formation of CMP nanofilms within 10 min. The micropore size and thickness of CMP membranes were feasibly regulated by rational utilization of molecular ligands and control of IP parameters. Importantly, introducing hydroxyl groups adjacent to aldehyde enlarges CMP pore apertures from 1.0 to 1.7 nm due to the reduced reactivity induced by steric hindrance and the formed intramolecular hydrogen bonds. The newly synthesized 2,5-dihydroxyterephthaldeyde–m-phenylenediamine membranes display an extraordinarily high water permeance (240.0 L m–2 h–1 bar–1) and an excellent brilliant blue R (825.9 Da) rejection (i.e., 98.3%). In addition, the CMP membranes achieve an unprecedented sieving capability for both dye/dye and dye/divalent salt mixtures. This catalysis diffusion-controlled, interface-confined polymerization means may enable the development of new coherent microporous organic polymer films with potential for water purification, adsorption, and gas purification.
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高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Decheng Liu,Kai Li,Min Li,Zheng Wang,Meixia Shan,Yatao Zhang
Covalent organic frameworks are potential candidates for the preparation of advanced molecular separation membranes due to their porous structure, uniform aperture, and chemical stability. However, the fabrication of continuous COF membranes in a facile and mild manner remains a challenge. Herein, a continuous, defect-free, and flexible azine-linked ACOF-1 membrane was prepared on a hydrolyzed polyacrylonitrile (HPAN) substrate via in situ interfacial polymerization (IP). A moderately crystalline COF ultrathin selective layer enabled ultrafast molecular sieving. The effect of synthesis parameters including precursor concentration, catalyst dosage, and reaction duration on the dye separation performance was investigated. The optimized membrane displayed an ultrahigh water permeance of 142 L m–2 h–1 bar–1 together with favorable rejection (e.g., 99.2% for Congo red and 96.3% for methyl blue). The water permeance is 5–12 times higher than that of reported membranes with similar rejections. In addition, ACOF-1 membranes demonstrate outstanding long-term stability together with organic solvent and extreme pH resistance. Meanwhile, the membrane is suitable for removing dyes from salt solution products owing to their nonselective permeation for hydrated salt ions (<10.6%). The superior performance and the excellent chemical stability render the ACOF-1 membrane a satisfactory system for water purification.
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PubMed
高影响因子
RSC Advances
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2019
·Vol. 9
·期 36
·20715-20727
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IF 3.049
Hong-Li Zhang,Bing-Hua Liu,Mingbo Yang,Pan Zhang,Jing-Gang Gai
A novel sulfaguanidine (SG)-modified polyamide thin-film composite (TFC) nanofiltration (NF) membrane was constructed by the strategy referred to as co-solvent assisted interfacial polymerization (CASIP), which involves the respective interfacial polymerization (IP) of piperazine (PIP) and SG with trimesoyl chloride (TMC) on porous polysulfone (PSf) supports. CASIP enables the formation of a defect-free thin dense active layer and favors higher water permeance up to 79.0 L m−2 h−1 with rejection above 98.3% for Na2SO4. The resulting PA membrane also demonstrates a high flux recovery ratio of nearly 98.9% to bovine serum albumin protein after being cleaned. More importantly, the current membrane shows excellent anti-adhesive and antimicrobial performances against Gram-negative Escherichia coli, Gram-positive Bacillus pumilus LDS.33 and Aspergillus parasiticus JFS. This promises great potential application of the PA membrane for practical water/wastewater treatment. The prospect of using the co-solvent mediated SG-modified layer as a next-generation anti-fouling/antimicrobial membrane is very encouraging.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 30
·18063-18071
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IF 10.733
Jianliang Shen,Runnan Zhang,Yanlei Su,Benbing Shi,Xinda You,Weixiong Guo,Yu Ma,Jinqiu Yuan,Fei Wang,Zhongyi Jiang
Covalent organic frameworks (COFs) are emerging porous crystalline materials with regular and permanent channels for constructing high-performance molecular sieving membranes. However, fabrication of COF membranes on porous supports in a facile manner remains a great challenge. Herein, a polydopamine (PDA)-modulated bottom-up approach was proposed to fabricate an ultrathin sulfonated imine-linked COF layer (SCOF, synthesized by Schiff-base reaction of 1,3,5-triformylphloroglucinol with 2,5-diaminobenzenesulfonic acid) on a polyacrylonitrile (PAN) support. The PDA layer deposited on the support acted as a molecular linker that attracted and bound COF building monomers, thus facilitating SCOF nucleation and growth of a defect-free SCOF layer. An optimized PDA deposition time of 1 hour provides sufficient adsorption sites for COF monomers without introducing additional water transport resistance. The resultant SCOF/PDA/PAN membrane shows an excellent water permeance of up to 1346 L m−2 h−1 MPa−1 with desirable dye rejection (e.g., Eriochrome black T and Congo red, >99.0%), which is nearly 7–12 times higher than that of most membranes with comparable rejection in the literature. This facile and universal PDA-modulated approach can be extended to a broad range of COF membranes and many other kinds of framework-based membranes.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
·
IF 1.911
Meidi Wang,Weixiong Guo,Zhongyi Jiang,Fusheng Pan
Polyamide (PA)-based thin-film composite membranes exhibit enormous potential in water purification , owing to their facile fabrication, decent performance and desirable stability. However, the thick PA active layer with high transport resistance from the conventional interfacial polymerization hampers their applications. The controllable fabrication of a thin PA active layer is essential for high separation efficiency but still challenging. Herein, a covalent organic framework TpPa-1 interlayer was firstly deposited on a polyethersulfone (PES) substrate to reduce the thickness of PA active layer in interfacial polymerization. The abundant pores of TpPa-1 increase the local concentration of amine monomers by adsorbing piperazine molecules, while hydrogen bonds between hydrophilic groups of TpPa-1 and piperazine molecules slow down their diffusion rate. Arising from those synergetic effects, the PA active layer is effectively reduced from 200 nm to 120 nm. By optimizing TpPa-1 interlayer and PA active layer, the water flux of resultant membranes can reach 171.35 L·m −2 ·h −1 ·MPa −1 , which increased by 125.4% compared with PA/PES membranes, while the rejection rates of sodium sulfate and dyes solution remained more than 90% and 99%, respectively. Our strategy may stimulate rational design of ultrathin PA-based nanofiltration membranes with high performances.
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RSC Advances
·
2017
·Vol. 7
·期 58
·36714-36721
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IF 3.108
Shuchen Shi,Yufeng Wu,Yueyan Wang,Jing Yu,Ying Xu
Herein, a novel polyaspartic acid derivative, polyaspartic acid/2-amino-2-methyl-1-propanol graft copolymer (PASP/AMP), was synthesized via a ring-opening reaction using polysuccinimide (PSI) and 2-amino-2-methyl-1-propanol (AMP). The structure of PASP/AMP was characterized via 1H NMR and FTIR. Its scale and corrosion inhibition performances were investigated via static and weight loss tests, respectively. Additionally, its biodegradability was assessed by measuring its chemical oxygen demand. The influence of PASP/AMP on scale deposition was observed via scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). The maximum scale inhibition efficiency of 100% for PASP/AMP against CaCO3, CaSO4, and Ca3(PO4)2 was achieved at the concentrations of 1, 4, and 14 mg L−1, respectively. Its corrosion inhibition efficiency for carbon steel is close to 28% at 24 mg L−1. The degradation rate of PASP/AMP could reach up to 65% within 28 days. According to the SEM images and XRD spectra, the scale deposits become irregular and distorted in shape, which can easily be dispersed by flowing water. This study demonstrates that PASP/AMP as a biodegradable inhibitor exhibits better scale and corrosion inhibition performances as compared to PASP and shows promising prospect for application.
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DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 32
·12745-12755
·
IF 4.177
Jun Liu,Wei Wu,Qingyong Tian,Zhigao Dai,Zhaohui Wu,Xiangheng Xiao,Changzhong Jiang
Coupling two different semiconductors to form composite photocatalysts is the most significant method for environmental remediation. In this regard, tube-like α-Fe2O3/Ag6Si2O7 heterostructures are synthesized via anchoring p-type Ag6Si2O7 nanoparticles (NPs) on the surface of n-type α-Fe2O3 short nanotubes (SNTs) by conventional wet-chemical routes. α-Fe2O3 SNTs are firstly fabricated by a hydrothermal method with the assistance of dihydrogen phosphate and sulphate. Then, Ag6Si2O7 NPs are anchored on α-Fe2O3 SNTs by an in situ deposition method, and the α-Fe2O3/Ag6Si2O7 p–n heterostructures are finally obtained. The morphologies, crystal structure, photocatalytic performance and photocurrent properties of as-synthesized α-Fe2O3/Ag6Si2O7 heterostructures are investigated. Six organic dyes are used for determining the high-efficiency Z-scheme photocatalytic activities of the as-obtained photocatalysts under ultraviolet and visible light (mercury lamp, 300 W). Compared with pure α-Fe2O3 SNTs, the photocurrent intensity of the α-Fe2O3/Ag6Si2O7 heterostructures is improved 62 times. The enhanced significant photocatalytic performance of α-Fe2O3/Ag6Si2O7 heterostructures could be attributed to charge transfer between Ag6Si2O7 NPs and the charge separation between Ag6Si2O7 NPs and α-Fe2O3 SNTs. These composite heterostructures are proposed to be an example for the preparation of other composite silicate photocatalysts for practical application in environmental remediation issues.
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