DESALINATION
·
2024
·
IF 8.3
Wenting Li,Mengdi Chen,Ganwei Zhang,Weicai Chen,Lei Zhang,Shusu Shen,Dapeng Liu,Xiaoji Zhou,Yaoliang Hong
The DCMD technology for wastewater treatment is very promising. However, it is easily suffered by membrane fouling and wetting. In this study, a Janus membrane was fabricated by coating polyvinylamine (PVAM) and gallic acid (GA) onto one side of a PVDF composite membrane, which another side is covered with POTS-SiO 2 . The PVAM and GA side could bind water to form a hydration layer, thus repel the contaminants. The POTS-SiO 2 side was superhydrophobicity and prevented the membrane wetting. Finally, The Janus membrane presented exceptional performance in separating salt containing emulsified oil by DCMD. It kept a stable flux of 17.0 ± 0.2 Kg·m −2 ·h −1 and a low level conductivity of 0.60 ± 0.02 μS/cm in the cold side during the 36 h DCMD procedure, compared with the pristine PVDF membrane and the PVDF/POTS-SiO 2 membrane. The results presented simultaneously antifouling and antiwetting properties of the Janus membrane. While the Janus membrane can be well used in desalination of emulsified oil containing salt, it has a great potential for application to treat other complex wastewater.
研究领域:
环境工程
·
膜科学
·
水处理
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产品关联
DOI
高影响因子
LUMINESCENCE
·
2017
·Vol. 32
·期 6
·970-977
·
IF 1.509
Shujuan Yu,Kuan Chen,Feng Wang,Yongfei Zhu,Xuehong Zhang
A simple microwave-assisted solvothermal method was used to prepare fluorescent nitrogen-doped carbon dots (N-CDs) with high fluorescence quantum yield (79.63%) using citric acid and N -(2-hydroxyethyl)ethylenediamine as starting materials. The PVAm-g-N-CDs grafted products were synthesized by amide bond formation between the carboxylic groups of N-CDs and amine groups of polyvinylamine (PVAm). Fluorescent hydrogel films (PVAm-g-N-CDs/PAM) were synthesized by interpenetration polymer network polymerization of PVAm-g-N-CDs and acrylamide (AM). When used for ion detection, we found that the fluorescence of the hydrogel films was clearly quenched by addition of Hg 2+ . Repeatability tests on using the hydrogel films for Hg 2+ detection showed that they could be applied at least three times. The PVAm-g-N-CDs/PAM could serve as an effective fluorescent sensing platform for sensitive detection of Hg 2+ ions with a detection limit of 0.089 μmol/L. This work may offer a new approach for developing recoverable and sensitive N-CDs-based sensors for biological and environmental applications.
研究领域:
材料科学
·
环境科学
·
分析化学
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DOI
高影响因子
AICHE JOURNAL
·
2012
·Vol. 59
·期 1
·215-228
·
IF 2.261
Zhihua Qiao,Zhi Wang,Chenxin Zhang,Shuangjie Yuan,Yaqun Zhu,Jixiao Wang,Shichang Wang
Polyvinylamine (PVAm) was modified using a cross-linking agent containing carriers piperazine (PIP). Attenuated total reflectance fourier transform infrared, elemental analyzer, and X-ray diffraction were used to characterize the PIP-modified PVAm. The PVAm–PIP/polysulfone (PS) composite membrane was developed by coating PVAm–PIP mixed solutions with different mass ratios of PIP/PVAm (m PIP /m PVAm ) on the PS ultrafiltration membrane. The effects of m PIP /m PVAm (from 0.715 to 2.860) in the coating solutions and wet coating thickness on the gas performance of the PVAm–PIP/PS composite membrane were investigated. The PVAm–PIP/PS composite membrane prepared showed higher performance than other membranes reported in the literature due to the large increase of the introducing carrier concentration and low crystallinity. Moreover, the separation performance stability of the PVAm–PIP/PS composite membrane was investigated and no deterioration in the membrane permselectivity was observed. Finally, the economic evaluation of the membrane with the highest performance prepared was carried out. © 2012 American Institute of Chemical Engineers AIChE J, 59: 215–228, 2013
研究领域:
材料科学
·
化学工程
·
气体分离膜
·
高分子化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Zhihua Qiao,Zhi Wang,Shuangjie Yuan,Jixiao Wang,Shichang Wang
Small molecular amines (SMAs) (ethanediamine (EDA), piperazine (PIP), monoethanolamine (MEA) and diethanol amine (DEA)) were separately used to modify the polyvinylamine (PVAm). ATR-FTIR, elemental analyzer, XRD and SEM were employed to characterize the SMA interacted PVAm. The PVAm–SMA/polysulfone (PS) membranes were developed by coating PVAm–SMA mixed solutions on the PS ultrafiltration membrane. CO 2 permeance and CO 2 /H 2 selectivity of the PVAm–SMA/PS membranes were investigated. Among different PVAm–SMA/PS membranes, the PVAm–MEA/PS membrane shows the highest CO 2 /H 2 separation performance. Moreover, the effect of the selective layer thickness on the CO 2 /H 2 separation performance of the PVAm–MEA/PS membrane was studied. With increasing the PVAm–MEA selective layer thickness, the CO 2 /H 2 separation performance of the membrane apparently decreases. Finally, the CO 2 /H 2 separation performance stability of the PVAm–MEA/PS membranes was investigated and no deterioration in the membrane permselectivity was observed.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yonghong Wang,Xue Bai,Xinru Zhang,Jinping Li
Mixed matrix composite membranes (MMCMs) integrate the merits of inorganic and organic materials, but the tortuous transport passageways bring about large transfer mass resistance for gas transport. Herein, we prepared polyethylenimine-functionalized halloysite nanotubes (PEI-HNTs) by the electrostatic self-assembly of positively charged polyethylenimine and negatively charged halloysite nanotubes . Blending as-obtained PEI-HNTs with polyvinylamine (PVAm), MMCMs were prepared by casting above mixed solution on the top of ultrafiltration polysulfone (PSf) support. PEI-HNTs had good miscibility with PVAm due to hydrogen bonding . MMCMs (1 wt% PEI-HNTs loading) exhibited exceptional separation performance (CO 2 permeance: 179 GPU ; CO 2 /N 2 selectivity: 127.9), respectively, which were 1.4 and 2.3 times that of MMCMs embedding with 1 wt% HNTs. Noticeably, its value was beyond those of MMCMs incorporating with reported hollow tubular filler as well as other shape filler. This is due to the fact that PEI on the surfaces of HNTs provides a lot of amine carriers, which facilitate CO 2 transport. More importantly, the transport passageways are continuous, thus presumably reducing the CO 2 transfer resistance compared to other shape inorganic material filled-MMMs. Besides, resultant MMCMs revealed desirable stability for over 360 h, with a CO 2 /N 2 mixture as feed gas. Remarkably, it maintained superior gas separation performance (CO 2 permeance of 126 GPU; CO 2 /N 2 selectivity of 88.6) under the acidic conditions.
研究领域:
膜科学与技术
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气体分离
·
材料化学
·
高分子材料
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化学工程
·
纳米复合材料
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环境催化
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 32
·16746-16761
·
IF 7.443
Jiayou Liao,Zhi Wang,Chengyun Gao,Ming Wang,Kai Yan,Xianmei Xie,Song Zhao,Jixiao Wang,Shichang Wang
A PVAm–HT membrane is fabricated by establishing a hydrotalcite (HT) channel in a polyvinylamine (PVAm) fixed carrier membrane. The flexible PVAm fixed carrier membrane material as a matrix membrane is beneficial to get high permeance. Simultaneously, the HT channels can be used as high-speed facilitated transport channels, in which the movable carbonate can actively meet CO2 and help to increase the CO2/N2 selectivity of membranes as in liquid membranes or in ion exchange membranes. Moreover, the unobstructed HT channels are conducive to transport CO2 rapidly and they can increase the chain spacing of polymers; these are beneficial to further enhance the permeance of membranes. In addition, the charged layers of HT provide necessary stability for movable carriers due to the electrostatic attraction. Thus, the PVAm–HT membrane obtains high permeance and high selectivity, as well as good stability. The CO2 permeance of the PVAm–HT membrane reaches 3187 GPU and the CO2/N2 selectivity of the PVAm–HT membrane reaches 296 at 0.11 MPa.
研究领域:
材料科学
·
环境工程
·
化学工程
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产品关联
DOI
高影响因子
Journal of Natural Gas Science and Engineering
·
2021
·
IF 4.965
Xiangyu Cai,Ye Yuan,Menglong Sheng,Jixiao Wang,Zhi Wang
The polyvinylamine (PVAm) was respectively modified by the MOFs (IRMOF-3 and ZIF-8) with amine groups that were characterized by TEM, SEM and XRD . The PVAm-MOFs/polysulfone (mPSf) mixed matrix membranes (MMMs) were fabricated by coating different PVAm-MOFs mixtures on mPSf ultrafiltration membranes. The performance of the PVAm-MOFs/mPSf and PVAm/mPSf membranes for CO 2 /CH 4 separation was investigated. Compared with the PVAm/mPSf virgin membrane, PVAm-MOFs/mPSf MMMs display higher CO 2 separation performance due to the decreased membrane effective thickness and incorporation of amine-rich nanochannels. Furthermore, compared with PVAm-ZIF-8/mPSf MMM, the PVAm-IRMOF-3/mPSf MMM possesses higher CO 2 /CH 4 separation performance. Then the CO 2 /CH 4 separation performance of the PVAm-IRMOF-3/mPSf MMMs with different IRMOF-3 loadings was studied. Compared with other reported membranes, the PVAm-IRMOF-3/mPSf MMM loaded 25 wt% IRMOF-3 shows higher CO 2 /CH 4 separation performance at both low and high feed pressure.
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
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Yang Li,Zhuonan Chen,Hongwei Yuan,Liu Chen,Dario R. Dekel,Xuezhong He
Facilitated transport membranes based on poly(vinylamine) (PVAm) exhibit high CO 2 selectivity but suffer from limited stability and performance trade-offs under humid conditions. Herein, we report an ionic liquid (IL) incorporation strategy coupled with covalent organic framework (COF) regulation to spatially tailor transport pathways in PVAm membranes. The incorporation of COF-JLU2 contributes to CO 2 separation through its high adsorption affinity and its role in modulating gas transport pathways, while the IL enhances carrier-mediated CO 2 transport. This structural integration promotes CO 2 sorption and transport while suppressing non-selective gas permeation. As a result, the hybrid membrane achieves a CO 2 /N 2 selectivity exceeding 170 with improved permeance under humid conditions, outperforming conventional PVAm-based systems. The performance enhancement is attributed to the combined effects of COF incorporation and PVAm-IL interactions, although the individual contributions of different transport mechanisms are not quantitatively decoupled in this study. Process simulation further indicates the potential of the developed membranes for post-combustion CO 2 capture based on a preliminary techno-economic assessment. However, further validation with more detailed process models, as well as long-term stability and pilot-scale testing, will be necessary to fully evaluate industrial applicability.
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.1
Zhu Danhong,Wu Wanhui,Zhang Lejing,Liu Zixin,Zhao Huan,Zheng Zhongkai,Lin Mei
The development of fluorescent probes with high stability and selectivity for ferric ion (Fe³⁺) detection remains crucial for environmental monitoring. Herein, we report a one-pot hydrothermal synthesis of nitrogen and sulfur co-doped carbon dots grafted with polyvinylamine (CDs-PVAm) using citric acid and L-cysteine as sustainable precursors. The obtained CDs-PVAm exhibited strong blue fluorescence with a high quantum yield of 49% and an average fluorescence lifetime of 9.75 ns, attributed to the synergistic effect of N, S co-doping and PVAm passivation which effectively suppresses non-radiative recombination. The material demonstrates excellent environmental stability over a wide pH range (3–9), under thermal stress (25–45 °C), and prolonged irradiation. As a fluorescent probe, CDs-PVAm shows high selectivity toward Fe³⁺ among various metal ions, with a linear response range of 0–200 µM and a detection limit of 11.40 µM. Practical application in natural water samples achieved satisfactory recoveries (100.46–101.45%) with low relative standard deviations (0.71–1.43%), confirming its reliability for Fe³⁺ detection in complex aqueous matrices. This work presents a robust nanoplatform for environmental sensing with significant application potential.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zhiyuan Huang,Ye Yuan,Weifan Wang,Hao Zheng,Zhi Wang
Mixed matrix membranes (MMMs) have demonstrated remarkable advantages in gas separation applications through the synergistic integration of polymeric matrices and nanostructured reinforcements. While these advanced composite thin-film materials exhibit substantial potential for CO 2 separation, their industrial-scale implementation confronts threefold challenges: elevated manufacturing costs, interfacial compatibility optimization between nanofillers and polymer matrices, and performance enhancement requirements for achieving superior separation efficiency. In this study, the green and economical nanofiller UIO-66-(COOH) 2 (denoted as UC) was strategically selected. A novel strategy involving synergistic modification using Zn 2+ and polyvinylamine (PVAm) was developed to address the critical challenge of severe particle agglomeration and sedimentation. This phenomenon, caused by intense electrostatic interactions between the strongly negatively charged UC and the cationic polymer PVAm during surface modification, was effectively mitigated through the proposed cooperative modification mechanism, resulting in the successful synthesis of P@UC-Zn exhibiting exceptional dispersibility and enhanced compatibility with the polymeric matrix. The fabricated P@UC-Zn-PVAm/mPSf MMMs containing 35 wt% filler exhibited remarkable CO 2 permeance (3250 GPU) and selectivity (166) under feed gas conditions (CO 2 /N 2 = 15/85 vol%, feed pressure: 2 bar). Furthermore, the optimized MMMs demonstrated robust operational stability in simulated flue gas tests and showed potential for applications in carbon dioxide-methane and carbon dioxide-hydrogen separations.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）