INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Feng Chen,Songlin Dong,Zhi Wang,Jiayou Xu,Rui Xu,Jixiao Wang
The incompatibility between nanofillers and polymer, caused by the agglomeration of nanoparticles and their weak interaction with each other, is still a challenge to develop mixed matrix composite membrane . Herein, we introduced the ZIF-8-TA nanoparticles synthesized by in situ hydrophilic modification into the hydrophilic poly(vinylamine) (PVAm) matrix to prepare composite membranes for H 2 purification. The dispersion of ZIF-8 in water was improved by tannic acid modification, and the compatibility between ZIF-8 particles and PVAm matrix was enhanced by chemical crosslinking between the quinone groups in oxidized tannic acid (TA) and the amino groups in PVAm. Moreover, the compatibility between hydrophobic polydimethylsiloxane (PDMS) gutter layer and hydrophilic separation layer was achieved by the adhesion of TA-Fe 3+ complex to the surface of PDMS layer during membrane preparation. The interlayer hydrophilic modification and the formation of separation layer were accomplished in one step, which simplified the preparation process. The experimental results indicated that when the TA addition used for modification was 0.5 g and the ZIF-8-TA 0.5 content in membrane was 12 wt%, the prepared membrane showed the best separation performance with the CO 2 permeance of 987 GPU and the CO 2 /H 2 selectivity of 31, under the feed gas pressure of 0.12 MPa.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Jingjing Yang,Sailong Chen,Guangxiang Liu
To solve the challenges of dyeing wastewater pollution and the shortage of reactive green dyes with a single structure, the development of recoverable and recyclable green dye for cotton is urgent and crucial. In this work, a series of novel eco-friendly dual-chromophore functionalized polyvinylamine derivatives (GCPDs) were prepared by grafting yellow and blue chromophores onto polyvinylamine. The grafted polyvinylamine was used as pH-sensitive macromolecular colorants for clean and sustainable coloration of cotton fabric. The pH sensitivity, zeta potential , and dissociation behavior of the GCPDs were studied. The results revealed that GCPDs were sensible to pH, with an isoelectric point ranging from 8.5 to 10.0. When the pH of their solution was below 10, they formed aggregates due to strong electrostatic interactions . Compared with ordinary polyampholytes, the aggregation of GCPDs still occurred when the pH value of their solution deviated from the isoelectric point due to the presence of aromatic rings in their structure. The inner part of the cotton yarns colored with GCPDs was fixed with green color, indicating that GCPDs can be uniformly distributed in cotton fabric. Compared with conventional single-structure reactive green dyes, the color shade of the cotton dyed with GCPDs can be controlled by varying the types and molar ratios of the blue and yellow chromophores in their structure. CIELab values showed that a* value of the dyed cotton ranged from −26.065 to −12.548, while b* value shifted from 2.092 to 20.178. The fixation efficiency of the GCPDs on cotton was greater than 97% when a cross-linking agent was used. GCPDs can be recovered from dying residue, with a recovery rate of >98%. The cotton dyed with GCPDs exhibited rubbing and wash fastness grades of 3–4 and 5, respectively. The dyeing properties of recycled GCPDs were identical to those of the original GCPDs. Therefore, this study provides insight into the development of recyclable and reusable dyes for a clean and sustainable coloration of cotton fabric.
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Shenyi Tang,Junjie Yang,Biao Wu,Jing Zhang,Jianxin Li,Benqiao He,Hong Wang,Zhenyu Cui
In this work, the organic-inorganic hybrid separation layer containing BaSO 4 or CaC 2 O 4 was fabricated on the membrane outer surface through the combination of polyvinylamine (PVAM)-tannic acid (TA)-metal ion co-deposition, dual cross-linking and biomineralization . Based on the synergistic coordination effect between TA and PVAM, metal ions were anchored within the separation layer. The strong interaction ability between functional groups of organics and metal ions enhanced the attaching stability of mineralized substances. Characterizing the chemical composition, hydrophilicity, microstructure, and potential of the NF membrane's outer surface allowed for a thorough investigation and comparison of the impact of mineralized substances on the separation performance of NF membrane. The results indicated that the introduction of mineralized substances provided the permeance path for water molecule and reduced the water transmission resistance, which not only increased the permeability (53.4 L m −2 h −1 bar −1 ) by 2.7 times, but also remained ultrahigh removal capacity for both Mg 2+ and Ca 2+ (>99%). Furthermore, the NF membrane also exhibited satisfactory acid resistance, anti-fouling capacity and favorable operation stability. This work demonstrated excellent potential in wastewater recovery and rapid desalination, serving as a reference for the development of high-performance NF membrane with positively charged surface.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jian Dong,Yi Wang,Liangliang Dong,Tatsuo Kaneko,Weifu Dong,Dongjian Shi,Mingqing Chen
Nanofiltration (NF) membrane technology holds unique application potential in the metal ion separation due to its high efficiency and low cost. However, the present NF membranes are facing the contradictory challenge of high water permeance and efficient separation for metal ions. In this study, we reported a NF membrane fabricated by amine-rich polymer polyethyleneamine (PVAm) with sodium lauryl sulphate (SDS) as the aqueous phase additive via reversed interfacial polymerization (IP). Based on the polymerization strategy and the role of amine groups and SDS, the fabricated membranes showed thinner and denser selection layer with positively-charged surface. Moreover, the membrane exhibited high water permeance (14.7 L m -2 h −1 bar −1 ), as well as excellent rejection performance towards divalent metal ions, including significant Li + /Mg 2+ separation (selective factor of 12.1) and high rejection rates for metal ions (Co 2+ 96.5 % and Sr 2+ 93.4 %), which are higher than most reported NF membranes. We believe this research provides valuable insights for the application of NF membrane in the field of salt-lakes lithium extraction and nuclide management.
研究领域:
膜技术
·
水处理
·
分离科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xinru Zhang,Xiaofeng Ren,Yonghong Wang,Jinping Li
Mixed matrix composite membranes (MMCMs) for CO 2 capture have great potential in carbon neutral goal. However, simultaneous enhancement in permeance and selectivity is very difficult, since mismatching pore and chemical structures of filler with polymer matrix are the stumbling block. Herein, novel core–shell MOFs@COFs hybrids were prepared by growing hierarchical pore covalent organic frameworks (COFs, nitrogen-enriched nanoporous polytriazine (NENP)) on the surface of metal organic framework (MOFs, zeolite imidazolate framework-8 (ZIF-8)), where ethylenediamine were impregnated into NENP pore to adjust the chemistry environment of the shell. Subsequently, a porous polysulfone (PSf) membrane-supported MMCMs were developed by a coating method using a mixed dispersion of ZIF-8@NENP-NH 2 and polyvinylamine (PVAm), which was used to efficiently separate CO 2 from N 2 . The rough COFs layer (NENP-NH 2 ) was closely wrapped on the smooth surface of ZIF-8 as identified by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and N 2 adsorption. Even-distributed ZIF-8@NENP-NH 2 had well miscibility with the PVAm matrix from hydrogen bonding as evidenced by SEM, attenuated total reflectance-FTIR and differential scanning calorimetry. The CO 2 permeance as high as 301 GPU accompanied with a selectivity of 91 was obtained for MMCMs loaded with 7 wt% ZIF-8@NENP-NH 2 , which were enhanced by 296.1% and 89.6%, respectively, when compared with the pristine PVAm membrane, transcending 2019 upper bound. We assume that the surface chemistry environment in hierarchical pore of the shell and molecular sieving pore in the core in the short-range order facilitate CO 2 permeation. Furthermore, this membrane maintained an average CO 2 permeance of 369 GPU and a CO 2 /N 2 selectivity of 97.3 for over 360 h using CO 2 /N 2 mixed gas as feed gas.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Jiayou Liao,Zhi Wang,Ming Wang,Chengyun Gao,Song Zhao,Jixiao Wang,Shichang Wang
An ion-exchange material – Poly(diallyldimethylammonium carbonate) (PDDACA) containing mobile carbonate has been prepared and it has been blended in a fixed carrier membrane material – polyvinylamine (PVAm) containing abundant amine-group to adjust the carrier microenvironment of the fixed carrier membrane. It makes the mobile carrier cruise around the fixed carrier. On one hand, the CO 2 can be transported continuously in the swing area of fixed carrier through the mobile carriers, the passivity of fixed carrier can be overcome and the utilization efficiency of fixed carrier can be enhanced. On the other hand, a loose and low crystalline system will be obtained by blending two polymers, the number of effective mobile carrier will be increased with mobile carriers unlocking from the crystalline area, and the loose and low crystalline system will provide a good environment for the movement of mobile carriers. These are conducive to enhance the performance of blend membrane in comparision with single polymer membrane. The CO 2 permeance and CO 2 /N 2 selectivity of PVAm-PDDACA membrane, which concurrently contains fixed amine carriers and movable carbonate carriers, can reach 909 GPU and 102 at 0.11 MPa, respectively. The performance of PVAm-PDDACA membrane is enhanced obviously in comparision with PVAm membrane and PDDACA membrane.
研究领域:
膜科学与技术
·
气体分离
·
高分子材料
·
化学工程
·
环境化工
·
能源材料
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Rui Xu,Zhi Wang,Ming Wang,Zhihua Qiao,Jixiao Wang
Under high nanoparticles loadings, the gas separation performance mixed matrix membranes (MMMs) could be limited by the inferior compatibility between polymer and nanoparticles. Herein, we utilized a “bridging-crosslinking” method to connect the polymer and nanoparticles via macromolecule. Specially, the poly(vinylamine) (PVAm) and UIO-66-NH 2 nanoparticles were bridging-crosslinked by using poly(ethylene glycol) diglycidyl ether (PEGDE) to achieve high nanoparticles loadings. By this way, even though the nanoparticles loadings attained 28.5 wt%, the incorporated nanoparticles still showed good dispersion in coating solution without sedimentation for one week. According to the gas permeation test, the fabricated MMMs with amounts of functional groups via “bridging-crosslinking” method displayed excellent gas separation performance and good long-term stability under the simulated flue gas . For CO 2 /N 2 (15/85) mixed gas, the MMMs can achieve a high CO 2 permeance of 1295 GPU and CO 2 / N 2 selectivity of 91 at 0.3 MPa. For CO 2 /CH 4 (10/90) mixed gas and CO 2 /H 2 (40/60) mixed gas, the gas separation performance of MMMs was investigated.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Shizhen Jia,Hui Cao,Xiangchao Liang,Shuang Wu,Rong Zeng,Mei Tu
Medical sponges are widely used in wound management, however the adhesion of bacterial or wound tissue to them may cause infection or secondary damage to patients. In this work, anti-bioadhesive polyvinyl alcohol-formaldehyde sponges with zwitterionic coating were prepared by the dip-coating process using the reactive zwitterionic phosphorylcholineated polyvinylamine (PVAm-PC) and commercial silane coupling agent KH560 at different mass ratios, and their structure, physicochemical, biocompatible and anti-bioadhesive properties were investigated. As compared to pristine sponges, the PVAm-PC-KH560 (PPK) modified sponges with the interconnected pore structure had almost unchanged water vapor transmission rate but decreased swelling degree to a certain extent possibly due to the formation of rigid Si– O –Si networks in the sponges. In vitro biological evaluation confirmed that PVAm-PC-KH560 modified sponges were not cytotoxic and had good resistance to bacteria adhesion with only ∼16% and ∼11% relative bacterial adhesion rate for E. coli and S. aureus respectively. And the optimized PPK-2 sponge showed the best comprehensive bacterial adhesion inhibition properties. Further adhesion assay of L929 fibroblasts showed that PPK-2 sponge could significantly reduce the adhesion of L929 fibroblasts. The results strongly suggested that dip-coating with zwitterionic PVAm-PC and KH560 may provide a promising and facile method to construct an anti-bioadhesive surface for biomedical applications.
研究领域:
生物医学工程
·
材料科学
·
生物材料
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）