JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Wenyi Ma,Jian Pan,Wanzheng Ren,Long Chen,Lilan Huang,Shanshan Xu,Zhaohui Jiang
Despite membrane separation technology has been extensively implemented in various field, the fouling caused by bacterial and organic dye seriously impair the performance and lifespan of the membrane, the anti-fouling modification of the membrane is still a challenging. In this work, the antibacterial and self-cleaning poly (vinylidene fluoride-chlorotrifluoroethylene) (PVDF-CTFE) mixed matrix membranes were prepared by non-solvent induced phase separation method using self-made graphite carbon nitride nanosheet wrapped copper phosphide (Cu x [email protected] 3 N 4 ) as modification additive. The sequel of the incorporated Cu x [email protected] 3 N 4 nanosheet content on the morphology, pore structure and physicochemical structure of membranes was investigated in terms of pure water flux, anti-fouling and antibacterial properties. The results showed that the addition of Cu x [email protected] 3 N 4 nanosheets not only improved the hydrophilicity and mechanical property of the membranes, but also enabled PVDF-CTFE membrane with the ability of inactivation bacteria and self-cleaning, which significantly enhanced the anti-fouling performance of PVDF-CTFE membrane in complex environment. When the amount of Cu x [email protected] 3 N 4 reached 2 wt%, the mixed matrix membrane possessed outstanding comprehensive performance with the pure water flux of 641.1 L m −2 h −1 , antibacterial rate over 99% and self-cleaning under simulated sunlight, making the mixed matrix membrane a potential choice for wastewater treatment . In conclusion, this study enlightened the fabrication strategy of multifunctional mixed matrix membranes.
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高影响因子
Membranes
·
2022
·Vol. 12
·期 9
·824
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IF 4.562
Kai Liu,Jinwen Guo,Yingdong Li,Jinguang Chen,Pingli Li
Artificial water channels (AWCs) have been well investigated, and the imidazole-quartet water channel is one of the representative channels. In this work, covalent organic frameworks (COFs) composite membranes were fabricated through assembling COF layers and imidazole-quartet water channel. The membranes were synthesized by interfacial polymerization and self-assembly process, using polyacrylonitrile (PAN) ultrafiltration substrates with artificial water channels (HC6H) as modifiers. Effective combination of COF layers and imidazole-quartet water channels provide the membrane with excellent performance. The as-prepared membrane exhibits a water permeance above 271.7 L·m−2·h−1·bar−1, and high rejection rate (>99.5%) for CR. The results indicated that the composite structure based on AWCs and COFs may provide a new idea for the development of high-performance membranes for dye separation.Keywords:high-flux membranes;artificial water channels;COFs;composite structure
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Lin Han,Tingting Wang,Jianchao Gong,Xin Li,Yaxiong Ji,Shifeng Wang
To address the competitive adsorption of complex wastewater components on organo-vermiculites (organo-Vts), multi-hydroxy containing gemini surfactants varying in alkyl chain length (G 12 , G 14 and G 16 ) are designed and applied for modifying Na-vermiculite (Na-Vt) targeted to the removal of co-existing MB and Pb(II). Organo-Vts exhibit enhanced hydrophobicity and enlarged interlayer spacing compared with Na-Vt, with the saturated modifier dosage reaching as low as 0.4 CEC of Na-Vt. Shorter alkyl chain induces suitable packing density and interlayer environment, endowing G 12 -Vt the highest adsorption capacity towards MB/Pb(II) compared with G 14 -Vt and G 16 -Vt (178.3/63.0 mg/g compared with 143.7/38.1 and 88.6/36.6 mg/g, respectively). Freundlich isotherm and PSO kinetic model are agreeable (the values of R 2 are higher than 0.98) with the endothermic adsorption processes . Notably, a simultaneous effect in binary-component system is obtained, and the maximum adsorption capacities of G 12 -Vt towards MB/Pb(II) reaching 349.9 and 124.5 mg/g, which are 1.96 and 1.95 times higher than single-component system, respectively. Combination of theoretical fitting and molecular simulation co-reveals the adsorption mechanism: the simultaneous effect is due to the providing of additional active sites by the adsorbed MB, which is stronger than that between Pb(II) and the modifier. Existence of π-ion interaction enhances the retention of Pb(II) for a further step. This work broadens a new research perspective for complex wastewater treatment and provides a deep understanding of the stimulative adsorption mechanism between dyes and metal ions .
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JOURNAL OF POLYMER RESEARCH
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2022
·Vol. 29
·期 7
·1-8
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IF 3.061
Liu Yuhao,Wang Jieqi,Chen Liping,He Yong
In order to enhance the adsorption and photocatalytic property of polyphenylene sulfide (PPS) melt-blown film, PPS melt-blown film was modified by loading ZIF-8 nanomaterial on the surface of the film via a simple solvothermal water method, the PPS melt-blown film was impregnated in advance. Film performance was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), X-ray diffraction (XRD). Results from FTIR and XRD showed that ZIF-8 was introduced into the modified PPS film successfully. The modified PPS film was endowed with excellent adsorption and photocatalytic compared with the original PPS by the result of enhanced dye removal. The removal rate of methyl blue (MB) by PPS/ZIF-8 film within the range of pH = 3–11 of the environmental solution were more than 80%, up to 99.1%. The dye removal rate still remained 80% after 5 repeat cycles, showed that the modified film has good stability.
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高影响因子
MOLECULES
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2022
·Vol. 27
·期 6
·2035
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IF 4.927
Jiao Jia,Hao Wu,Le Xu,Fengchun Dong,Yongtang Jia,Xi Liu
A nanofiber metal–organic framework filter, a polyacrylonitrile (PAN) nanofiber membrane composite with an iron/2-amino-terephthalic acid-based metal–organic framework (MIL101(Fe)-NH2), was prepared by one-step electrospinning. MIL101(Fe)-NH2was combined into the polymer nanofibers in situ. PAN-MIL101(Fe)-NH2composite nanofiber membranes (NFMs) were prepared from a homogeneous spinning stock containing MIL101(Fe)-NH2prebody fluid and PAN. Crystallization of MIL101(Fe)-NH2and solidification of the polymer occurred simultaneously during electrospinning. The PAN-MIL101(Fe)-NH2composite NFM showed that MIL101(Fe)-NH2was uniformly distributed throughout the nanofiber and was used to adsorb and separate acidic organic ionic dyes from the aqueous solution. The results of Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analysis showed that MIL101(Fe)-NH2crystals were effectively bonded in the PAN nanofiber matrix, and the crystallinity of MIL101(Fe)-NH2crystals remained good, while the distribution was uniform. Owing to the synergistic effect of PAN and the MIL101(Fe)-NH2crystal, the PAN-MIL101(Fe)-NH2composite NFM showed a fast adsorption rate for acidic ionic dyes. This study provides a reference for the rapid separation and purification of organic ionic dyes from wastewater.Keywords:electrospinning;MIL101(Fe)-NH2;functional nanofibers;water treatment membrane
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高影响因子
JOURNAL OF MATERIALS RESEARCH
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2022
·Vol. 37
·期 8
·1475-1485
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IF 2.909
Xu Jiaopeng,Chen Yingbo,Cao Ming,Wang Chuanfeng,Guo Pengfei
Solar steam generation (SSG) system greatly improves the efficiency of water evaporation through heat localization, which has broad application prospects at seawater desalination and wastewater treatment. In this paper, polyamide 6-graphene oxide (PA6-GO) membrane was fabricated by nonsolvent-induced phase separation of a solution with GO-modified PA6 in formic acid. Furthermore, the PA6-GO membrane was modified by vacuum filtration of self-assembly gold nanoparticles on its surface for solar stem generation. The composite membrane obtained a light absorption rate of nearly 99.8%. Under the irradiation of 1 kW m −2 , the evaporation rate of 1.1 kg m −2 h −1 was obtained and the evaporation efficiency also reached to 75.6%. The evaporation system has the characteristics of low cost, high stability, strong acid, and alkali corrosion resistance, suggesting great potentials in seawater desalination and sewage treatment. Graphical abstract
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CHEMOSPHERE
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2022
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IF 8.943
Xin Rong,Xiaoxin Chen,Pan Li,Chenyang Zhao,Shan Peng,Haiyun Ma,Hongqiang Qu
Microplastics (MPs) pollution evolves into a global environmental problem to be solved urgently. Although many studies are exploring ways to remove MPs from water environment, most of them are lack of selectivity and low efficiency. Herein, considering the fascinating absorption selectivity of superwetting materials, a robust magnetic-responsive superhydrophobic and superoleophilic sponge was firstly used to quickly eliminate MPs from water with very high efficiency. The functional sponge was fabricated by a non-fluorinated coating technique that consisted of polydimethylsiloxane (PDMS) grafted Fe 3 O 4 particle, PDMS grafted halloysite nanotubes , and PDMS binder. The coated sponge achieved excellent mechanically durable and chemically stable superhydrophobicity that resisted a series of severe treatments. It was unquestionable to show very fast oil absorption. What's more, it especially showed very high adsorption capacity (24.3–48.2 mg/g) and could quickly adsorb almost 100% MPs (polypropylene, polyvinyl chloride , and polyethylene) from aqueous suspensions. Moreover, the removal rates remained almost 100% for these MPs after 50 cycles. Besides, the coated sponge had excellent salt tolerance and antibacterial activity to Escherichia coli ( E. coli ) (99.91%) and Staphylococcus aureus ( S. aureus ) (90.46%). The adsorption mechanism of the coating was discussed from the perspectives of molecular structure, electronic effect, steric hindrance, and size-scale effect. The absorption driving force mainly derived from the intra-particle diffusion under capillary attraction, whilst slight electrostatic interaction, hydrogen bond interaction, and σ-p (or p-p) conjugation between PDMS and MPs. This functional sponge was destined to be a new strategy in the removal of MPs and other solid pollutants, especially in the high-salinity and rich-microorganism water environment.
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高影响因子
FOOD CHEMISTRY
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2022
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IF 9.231
Shuangshou Wang,Lu Zhang,Qiwen Jin,Zhongqiu Xu,Jiayi Zhao,Yuwen Ding,Wenzhi Li,Peng Lin,Jing Gu,Qi Zhang,Yang Chen,Hongmei Chen,Tingxuan Yan
A filter paper-based colorimetric strategy for instrument-independent visual detection of artificial food colorants (FCs) was developed in this study. Indicator papers were prepared via the one-step polycondensation of silane coupling agents onto glass microfiber filter papers, and colorimetric cards with a fine one-to-one correspondence between their colors and FCs concentrations were straightforward obtained by the extraction of FCs with indicator papers by virtue of electrostatic interaction and hydrophobic effect. Filter papers post-modified via such a simple way were proved to be of improved binding class selectivity and colorimetric sensitivity, allowing for in-situ colorimetric assay of FCs in an unprecedently wide range of applicable pH (1.0–12.0) with high reliability and fine versatility. Finally, the semiquantitative naked-eye determination of FCs (Allura red, brilliant blue and sunset yellow) in real-world drink samples was experimentally confirmed to be feasible by comparison with the findings of UV–vis absorption spectra, HPLC and mass spectra.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Xuyou Yang,Junhui Huang,Fan Yang,Wenguang Wang,Caihong Xue,Wanji Zhou,Yadong Wu,Lu Shao,Yanqiu Zhang
Phytate as a natural strongly charged organophosphate has recently attracted much attention in diverse fields including membrane separations towards water-energy-food nexus. However, the ideal phytate-based nanofiltration membrane with defect-free and ultrathin selective layer for highly-efficient water treatment is still much challengeable due to the typical aggregation of metal ions and uncontrolled reaction between metal ion and organophosphate via conventional coating method. Herein, metal-organophosphate biphasic interfacial coordination reaction is proposed to construct ultrathin (13.4 nm) selective layer of phytate-based nanofiltration membranes with high permeance and excellent stability by controllable coordination assembly. Iron acetylacetonate (Fe(acac) 3 ) as an organic phase monomer with powerful electron-gaining ability is exploited to avoid the aggregation of traditional Fe(III) in aqueous phase, which can also coordinate with phytic acid (PA) to ensure a defect-free ultra-thin selective layer. The architecture of the phytate-based selective layer can be well regulated by optimizing the coordination metal source, the concentration of PA and Fe(acac) 3 , reaction time, so as to achieve the ultrahigh permeation flux of 190 L m −2 h −1 with excellent dye rejection (99.6%). Most interestingly, our phytate-based nanofiltration membranes with plenty of hydrophilic phosphate groups on the surface and high binding energy of P–O–Fe bond (−315.1 kJ mol −1 ) exhibited the long-term separation stability, excellent acid-resistance and anti-pollution ability, realizing the stable membrane separation process under harsh conditions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yucheng Li,Xiangyu Wang,Zhengyin Duan,Dehai Yu,Qiang Wang,Dandan Ji,Wenxia Liu
Treating dye-contaminated wastewater using the visible light–driven photo-Fenton reaction is beneficial to environmental remediation. This paper reports the synthesis of a novel, highly effective photo-Fenton catalyst, the Zn/Co-ZIFs@MIL-101(Fe) composite, by a facile internal-growth method. The composite, which had an MOF-in-MOF structure, activated H 2 O 2 to decompose RhB, a polluting-dye model, under visible-light illumination. The transfer of the electron–hole pair was synergistically accelerated by the reaction centers of the composite (the MIL-101(Fe) shell and Zn/Co-ZIFs core), which enhanced H 2 O 2 activation. The generated OH, O 2 − , and 1 O 2 effectively decomposed RhB. The composite’s catalytic performance was significantly enhanced by the electronic hybridization of its Fe 3+ , Co 2+ , and Zn 2+ metal centers. Thus, the composite demonstrated a remarkable capability to remove RhB. The composite polymetallic MOFs loaded with 3% Zn/Co-ZIFs prepared by us showed good reusability and water stability, and their morphology and structure did not change significantly after four runs, depending on the iron, cobalt, and zinc metal leaching concentrations 0.134 mg/L, 0.06 mg/L and 0.054 mg/L respectively. This study provides a novel method to construct an Zn/Co-ZIFs@MIL-101(Fe) catalyst with dual reaction centers that enhance the transfer of electron–hole pairs. Our findings inspire the application of MOF-based photo-Fenton catalysts to wastewater treatment and environmental remediation.
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DESALINATION
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2022
·
IF 11.211
Yi-Xin Wang,Cheng-Ye Zhu,Jingliang Huang,Hao-Cheng Yang,Zhi-Kang Xu
Thin-film composite (TFC) membranes can find broad uses in desalination and wastewater treatment . However, industrialized interfacial polymerization involves many organic solvents and toxic monomers . An aqueous fabrication process can meet the standards of green and sustainable production, but fabricating defect-free thin films in a homogenous phase remains challenging. Herein, we fabricate a series of TFC nanofiltration membranes through a contra-diffusion process based on the cross-linking of metal ions and alginate . The film formation is confined at the ultrafiltration substrate surface due to the competition between reaction and restricted diffusion. Among a series of metal ion/alginate composites, the Cu 2+ /alginate composite membrane displays superior nanofiltration performance because of the strong affinity between Cu 2+ and alginate. The highly negatively charged membrane performs a high rejection to divalent anions and anionic dyes based on the Donnan effect . The effects of alginate concentration and diffusion time on membrane performance were investigated to achieve optimal fabrication conditions. The as-prepared membrane shows a rejection of 96.2% to Na 2 SO 4 with permeation flux around 50.2 L·m −2 ·h −1 under 0.6 MPa, and 99.5% to several dye molecules. Moreover, the membrane performs outstanding anti-fouling and anti-bacterial properties because of its excellent hydrophilicity and the existence of Cu 2+ .
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