ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 24
·2214661
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IF 19
Jing Yang,Ligang Lin,Fengling Tang,Zixu Zhang,Zitian Liu,Meina Xu,Xu Yang,Qiying Wang,Aishan He,Qi Cheng,Chunhong Wang
The development of low-pressure or pressureless self-driven membranes is important for saving energy and overcoming the critical trade-off effect in membrane separation processes. However, conventional self-driven membranes rely on gravity, which is effective in the separation of large-sized materials but is still ineffective in the fine separation of small molecules. Herein, inspired by the capillary effect that exists in nature, a capillary force-induced membrane-driving strategy for fine separation at ultra-low pressures is demonstrated. Hydrophilic nanoparticles are prepared by a cross-linking reaction between tannic acid and 3-aminopropyltriethoxysilane and then introduce them into membrane pores to simulate sand accumulation with an aim to generate the capillary force. The membrane is then used in ultra-low pressure membrane separation. Interestingly, it is found that the membrane has excellent performance in the separation of dye/salt mixtures (dye rejection > 99%, salt rejection < 10%) and a high permeate flux (160 L m −2 h −1 ) under near “zero pressure” conditions. Moreover, the structural stability of the membrane is verified. Introducing capillary forces into membranes as an autonomous driving force can be a promising universal approach that can be added up to the toolbox for the efficient preparation of separation membranes.
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DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Zitian Liu,Xuesong Deng,Ligang Lin,Rongrong Qiang,Qiying Wang,Qi Cheng,Jing Yang,Xu Yang,Wensong Ma,Xinyang Li,Meina Xu,Chunhong Wang,Qingping Xin,Kongyin Zhao
Efficient separation of dyes and salts from textile wastewater is still a great difficulty. Herein, a tris(hydroxymethyl) aminomethane (Tris)-modified polyimide (PI) membrane was developed, which was effective, easy-to-fabricate, and versatile with high-separation-selective performance. With the introduction of Tris, the roughness, hydrophilicity and negative zeta potential of the membranes were increased, and the pore size was reduced. At 3 bar, the representative membrane exhibited high permeate flux (176–206 L·m −2 ·h −1 ) and high rejection (>97 %) to four common dyes and excellent solvent resistance to seven organic solvents, indicating that PI/Tris membrane had potential for application in dye wastewater containing complex organic solvents. Furthermore, the PI/Tris-modified membrane could selectively separate dyes and salts, and presented high dye rejection (>99 %) and low salt rejection (≈7 %) as well as high selectivity (separation factor = 103) for Direct Black 38/NaCl mixture. In particular, the PI/Tris-modified membranes outperformed many contemporary separation membranes in terms of separation efficiency of dye/salt mixtures. In summary, this PI/Tris membrane developed in this study has a promising future in the field of industrial dye wastewater treatment .
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Lijing Xu,Kongyin Zhao,Junping Miao,Zhenhao Yang,Zhiwei Li,Lei Zhao,Hongxian Su,Ligang Lin,Yunxia Hu
In order to solve the problems of poor mechanical property, non-antibacterial and low flux of calcium alginate (CaAlg) membrane, silver nanoparticles (AgNPs) were synthesized with bovine serum albumin (BSA) and carboxymethyl chitosan (CMCS) for improving CaAlg membrane in this paper. Meanwhile, the dispersion property of silver nanoparticles and the mechanical property, thermal stability , antibacterial property and filtration efficiency of the composite membrane were explored. The results illustrated CMCS observably strengthened the mechanical property and thermal stability of the composite membrane, and AgNPs endowed the composite membrane with excellent antibacterial property . The flux of the BSA/CMCS/AgNPs/CaAlg composite membrane was raised compared to CaAlg membrane. Finally, the viscose fiber/polyethylene terephthalate fiber (VF-PET) nonwoven fabric was introduced as the support layer to further improve the filtration flux and mechanical property of the composite membrane. VF-PET/BSA/CMCS/AgNPs/CaAlg membrane had a rejection rate of over 99.0 % for dye molecules and <9.0 % for salt ions, while the flux maintained 38.5 L·m −2 ·h −1 . Furthermore, VF-PET/BSA/CMCS/AgNPs/CaAlg membrane also had excellent separation effect on actual dye wastewater. The separation of dye and salt by the membrane mainly depended on the screening mechanism of membrane pore size, rather than adsorption. The composite membrane had an outstanding performance on the separation of dye molecules and inorganic salt ions.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Ming Qian,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
Generally, electrospun membranes have high mechanical strength , high porosity and low permeation resistance. Although covalent organic frameworks (COFs) have attracted great interest as advanced membrane materials, few works disclosed that the COFs composite membranes were synthesized on electrospun substrates. In this work, the electrospun polyvinylidene fluoride (PVDF) membranes were used as substrates for the preparation of COF composite membranes with graphene oxide and oxidized carbon nanotubes (GO-OCNTs) as an intermediate layer. The COF/GO-OCNTs/PVDF composite membranes were prepared by suction filtering the GO-OCNTs intermediate layer on the electrospun substrate, and then interfacial polymerization of COF layer. After adding the intermediate layer, the water permeance and dye retention rate of the composite COF membrane are both improved. By exploring the reaction parameters in the interfacial polymerization process, the optimized membrane shows that the rejection rate of Coomassle brilliant blue G250 (BBG-250) is about 97.1%, and the water permeability achieves 96.7 L m −2 h −1 bar −1 . In addition, the COF/GO-OCNTs/PVDF composite membrane exhibits excellent chemical and mechanical stability. The long-term filtration experiment of the composite membrane shows good water permeation stability. This work provides a method to prepare dense and defect-free COF films on electrospun substrates.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ningning Gao,Wenbin Xie,Lijing Xu,Qingping Xin,Junkui Gao,Junjun Shi,Jin Zhong,Wenxiong Shi,Huiguo Wang,Kongyin Zhao,Ligang Lin
The development of membranes for protein purification has stringent requirement of disinfection resistance, low protein adsorption and anti-fouling, without changing protein structure. In this study, hydrophilic titanium dioxide (TiO 2 )/calcium alginate (TiO 2 /CaAlg) hydrogel membranes were prepared by a simple ionic cross-linking method. The effects of the porogenic agent polyethylene glycol (PEG) concentration, the molecular weight of PEG, and the concentration of TiO 2 on the filtration properties were systematically investigated. The TiO 2 /CaAlg membrane exhibited excellent bovine serum albumin (BSA) rejection and anti-fouling properties. The mechanical properties and surface energy of the TiO 2 /CaAlg membrane were significantly improved. The chemical bonding mechanism of TiO 2 and NaAlg was investigated by molecular dynamic simulation. The TiO 2 /CaAlg membrane had good chlorine resistance and could be disinfected or cleaned with sodium hypochlorite. The TiO 2 /CaAlg hydrogel membrane loaded with polyhydroxybutyrate (PHB) nanofibers maintained high flux (136.7 L/m 2 h) and high BSA rejection (98.0 %) at 0.1 MPa. The results of circular dichroism and synchronous fluorescence indicated that the secondary structure of BSA was maintained after membrane separation. This study provides one method for the preparation of green and environmentally friendly membrane for protein purification.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiao-lei Wang,Shu-qian Dong,Wei Qin,Ya-xian Xue,Qi Wang,Jun Zhang,Hong-yu Liu,Huan Zhang,Wan Wang,Jun-fu Wei
A loose nanofiltration (NF) membrane for dye desalination was prepared by ionic crosslinking assisted layer-by-layer self-assembly method. The natural chitosan (CS) and sodium alginate (NaAlg) were used as the cationic and anionic polyelectrolytes, respectively. CaCl 2 was used as the ionic crosslinker based on the chelating ability of NaAlg and CS to Ca 2+ ions. The structures, morphologies and surface charge properties of the assembly layers were characterized. In addition, the effects of self-assembly conditions and operation conditions on the filtration performances of composite membranes were evaluated systematically. The results indicate that the dye rejection of assembled membrane increases due to the crosslinking of Ca 2+ ions. The resultant HPAN-(CS/NaAlg) 3 membrane shows high rejections to dyes (98.8% for Congo red, 98.9% for Coomassie brilliant blue G-250, 98.5% for Direct black 38) and low rejections to inorganic salts. Moreover, HPAN-(CS/NaAlg) 3 membrane exhibits high permeate flux (54.8 L·m −2 ·h −1 ·bar −1 ), good stability in continuous filtration and antifouling property.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xu Yang,Ligang Lin,Zitian Liu,Jing Yang,Qi Cheng,Wensong Ma,Meina Xu,Fengling Tang,Qiying Wang,Xinyang Li,Aishan He,Chunhong Wang,Xiaolan Zhang
It is extremely difficult to separate salts and dyes from high-salinity printing and dyeing wastewater. In this study, modified montmorillonite (EPTAC-CD-MMT) was obtained by intercalation of 2,3-epoxypropyltrimethylammonium chloride (EPTAC) modified cyclodextrin (CD). PI/EPTAC-CD-MMT membrane was prepared by blending EPTAC-CD-MMT with polyimide (PI). The addition of EPTAC-CD-MMT could inhibit the motion of PI molecular chains and increase the solvent resistance of the membrane. Additionally, EPTAC-CD-MMT exhibited spontaneous “internal drive” during the phase transition and segregated to the membrane surface. The pore structure of the membrane was adjusted to a well-developed “side pore” structure. Thus, solvent-resistant membranes for dye/salt separation with high flux were finally obtained. The successful modification of MMT was demonstrated by FTIR, XRD, TGA and XPS. EDX and SEM were used to characterize the surface segregation phenomena and well-developed pore structures of the membranes. When EPTAC-CD-MMT was added at 3 wt%, the membranes showed a significant increase in pure water flux (138.0 L·m −2 ·h −1 ·bar −1 ), high dye rejection (>98.5 %), low salt rejection (<10.0 %), and good solvent resistance in six organic solvents. This demonstrated the potential of PI/EPTAC-CD-MMT separation membranes for the treatment of dye wastewater containing sophisticated organic solvents.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jing Yang,Zixu Zhang,Ligang Lin,Fengling Tang,Meina Xu,Zitian Liu,Xu Yang,Qiying Wang,Wensong Ma,Qi Cheng,Aishan He
Accurate separation of dyes/salts is a crucial step in the treatment of dye-containing wastewater. Therefore, separation membranes with high permeability and high dye/salt selectivity are urgently required. In this study, an ultrathin gel layer of carboxymethyl cellulose was constructed on a poly(vinylidene fluoride) membrane surface. This gel layer contains a backbone support structure and provides the bionic-inspired capillary effect, which endows the membrane with the capability to realize the efficient separation of dyes and salts. The introduction of silver nanoparticles (Ag NPs) into the gel layer provides a skeleton support structure, which prevents the collapse of the gel layer, reduces the actual separation layer thickness, and decreases the mass transfer resistance. Moreover, the formation of capillaries between the numerous Ag NPs facilitates the rapid penetration of water molecules. Interestingly, this membrane exhibited excellent selectivity for dye/salt separation (dye removal >99.5 %, salt removal <10 %) while maintaining an exceptionally high water permeate flux (244.5 L/m 2 h). Moreover, the membrane exhibited excellent stability. This study demonstrates that the construction of organic/inorganic three-dimensional structures with capillary and skeletal support effects show promise potential for modification of dye/salt separation membranes.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yuefei Song,Yueke Sun,Nan Zhang,Chen Li,Mengxiang Hou,Kexin Chen,Tiemei Li
The complete fractionating synthetic and real dye/salt mixtures through loose nanofiltration membranes are of great significance for the textile wastewater recycling and reuse. Therefore, in this paper, a custom-tailoring loose nanocomposite membrane was fabricated to validate the feasibility of high-efficient dye/salt fractionation in the real pretreated hairwork dyeing effluent (HDE). It was observed that after partial alternative doping of 4,4′-bipiperidine and continuous incorporating of graphene quantum dots, the resultant membrane skin-layer features including smoothness, hydrophilicity and surface charge as well as nominal pore size were improved synergistically. Consequently, the optimal TFN-0.2 membrane showed outstanding fractionation and antifouling performance for synthetic dye/salt mixtures and real pretreated HDE. Specifically, for the former, the as-prepared TFN-0.2 membrane displayed the highest water permeance of 56.0 L·m −2 ·h −1 ·bar −1 , retention for all selected dyes (≥99.8%) and salt permeability (≥91.2%). Besides, the antifouling indexes in terms of reversible and irreversible fouling ratios of TFN-0.2 membrane against HDE solution reduced from 13.3% and 20.7% of pristine one to 8.32% and 1.34%, respectively. While flux recovery ratio markedly enhanced from 79.1% to 98.5% in the meantime. Overall, this work provides a facile method to fabricate high-efficient loose nanofiltration membranes for sustainably and precisely fractionating dye/salt mixtures from textile wastewater.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Qingquan Lin,Yongcong Liu,Guangyong Zeng,Xiaoke Li,Bin Wang,Xiaojie Cheng,Arijit Sengupta,Xiaojun Yang,Zhenhua Feng
Membrane separation technology has been widely used in the field of industrial dye wastewater treatment . In this work, a series of new composite membranes were fabricated by modifying MXene two-dimensional (2D) materials with polydopamine (PDA) from the mussel biological inspiration via vacuum filtration on cellulose acetate (CA) support. Scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), X-ray diffraction technique (XRD), energy spectrum analysis (EDS), have been utilized to evident the successful synthesis of MXene and the modification of MXene by PDA. The resultant PDA@MXene/CA membrane was found to have good hydrophilicity, and the pure water flux reached up to 271.2 L·m −2 ·h −1 , which was 277% more than the unmodified membrane. An improvement in dye separation capability has also been noticed using PDA@MXene/CA membranes. The rejection ratio of direct red 28 reached 88.9%, and that of direct black 38 reached 88.6%. Moreover, a strong anti-fouling characteristic with good antibacterial ability of resultant membrane was demonstrated. Therefore, the new modified membrane showed the potential for good application prospects in the field of small molecule separation.
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高影响因子
DESALINATION
·
2020
·
IF 7.098
Yue Zhang,Kongyin Zhao,Zhijian Zhang,Huike Xie,Ziyi Li,Ze Lin,Chen Mo,Wendong Yang,Xiaolei Wang,Junfu Wei
Calcium alginate hydrogel is an eco-friendly material, but its wide application as a self-supporting filtration membrane is severely limited by the weak mechanical properties, which makes it difficult for the large scale preparation and the fixation of the membrane in filtration equipment. In this work, a fiber-reinforced calcium alginate membrane (CaAlg-PP) was prepared by coating calcium alginate (CaAlg) hydrogel on the polypropylene (PP) non-woven fabric treated with ethanol/water (v:v = 1:1) solution. The CaAlg-PP filtration membrane was characterized and used for dye/salt separation under a series of operating conditions. The membrane exhibited the co-operativity of the porous support layer and the CaAlg hydrogel in the compositing process, and also exhibited good pressure resistance, pollution resistance and low anionic dye adsorption efficiency. The optimized CaAlg-PP membrane had a high permeance (e.g. 20.3 L·m −2 ·h −1 for methyl blue at 0.1 MPa) and high dye rejection (e.g. methyl blue 99.5%), while low salt rejection (e.g. NaCl 7.5%), and the selectivity of methyl blue/NaCl was up to 185. The CaAlg-PP membranes made with simple processes and low-cost materials may provide new strategies for environmentally-friendly and economical low salts-containing wastewater treatment and dye recycling.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
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
危险品化学品经营许可证（带存储）