DESALINATION
·
2024
·
IF 8.3
Xiaolei Chen,Zhongsen Yan,Haiqing Chang,Qiankun Wang,Gongduan Fan,Jinghan Ye,Kaiqin Xu,Heng Liang,Fangshu Qu
Fouling of membranes continues to be a prominent challenge in the membrane distillation (MD) treatment of high salinity organic wastewater (HSOW). Although membrane electrochemical reactor (MER) can effectively inhibit the membrane fouling of MD, the high cost of the proton exchange membrane (PEM) used in MER limits its widespread application. In this study, cost-effective pressure-driven membranes were employed as a substitute for PEM to establish pressure-driven membrane electrochemical reactors for HSOW pre-treatment. By using ultrafiltration membrane (UFM) and reverse osmosis membrane (ROM), UFMER and ROMER were developed, respectively. Due to the superior electrochemical performance of UFM, UFMER saved 43 % of energy compared to PEMER with the highest removal rate of organics (~85 %) in the simulated HSOW treatment. In practical applications, using UFMER significantly reduced the amount and size of complexes in the real nanofiltration concentrate (NC) of landfill leachate. This contributed to the superior specific flux maintenance (97 %) with a salt rejection (>99 %) and the highest recovered specific water flux (99.6 %) in MD cases. UFMER reduced ~27 % of energy compared to PEMER in MER pre-treatment, and saved the most energy (~39.6 %) in MD post-treatment. Hence, this strategy is potential for forthcoming applications, notably in lowering the membrane cost of MER and energy consumption of both MER and MD.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jing Xue,Zhiwei Jiao,Ran Bi,Runnan Zhang,Xinda You,Fei Wang,Linjie Zhou,Yanlei Su,Zhongyi Jiang
The chlorine resistance is recognized as one of the crucial and essential properties of membranes in water treatment field. In this study, β-cyclodextrin (β-CD) with abundant hydrophilic hydroxyl groups as aqueous phase monomer and trimesoyl chloride (TMC) as organic phase monomer were utilized to fabricate the polyester thin film composite (TFC) nanofiltration (NF) membranes by interfacial polymerization (IP) method. The optimized β-CD polyester TFC membrane with 1.8 wt% β-CDs in aqueous phase was immersed in harsh chlorine environment (10000 ppm NaClO aqueous solution) up to 96 h and exhibited the steady water flux and dye rejection, manifesting the outstanding chlorine-resistant performance of β-CD polyester TFC membranes. The sodium hypochlorite cleaning experiments showed that NaClO was effective to remove the deposited and adsorbed foulants onto the β-CD polyester TFC membranes. Therefore, the superior chlorine resistance of β-CD polyester TFC nanofiltration membranes would find promising potential applications in water treatment processes.
研究领域:
材料科学
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水处理工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Xiaoyun Li,Zhen Wang,Xin Jing,Xudong Li,Junwei Wang,Maoqing Kang,Yuhua Zhao,Qifeng Li
Hydrogen bonds, which can be divided into many types along with the deepening of research, exist in many compounds and have certain impact on properties of substances. In this work, effect of intramolecular hydrogen bond on solvent resistance of polymeric membranes was studied from two aspects. On the one hand, the existence of intramolecular hydrogen bond on solvent resistance of polymeric membranes was studied by constructing and shielding special hydroxyl groups in typical polymer polyurethane. On the other hand, content of intramolecular hydrogen bond on solvent resistance was investigated by building different ratios of inter- and intra-molecular hydrogen bonds in polyvinyl alcohols. The structures, solvent resistance and hydrogen bonding interactions were systematically investigated by FT-IR, XRD, Ds and performances before and after immersed in solvents. Permeabilities of the membranes for practical application were also characterized. The results showed that distinct type and ratio of hydrogen bonds played different role on solvent resistance. A good agreement between the swelling performances and content of intramolecular hydrogen bond proved the positive effect of intramolecular hydrogen bond on solvent durability of polymeric membranes. In addition, polyurethane membranes exhibited good impermeability to water vapor, oxygen and chloride ions which showed potential application in many fields.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yaqi Zhang,Linli Tan,Na Han,Shiwei Tian,Wei Li,Wei Wang,Yutong Wu,Zhongshun Sun,Xingxiang Zhang
The separation of oil-in-water and water-in-oil emulsions with high efficiency and environmental friendly remains a challenge in the past decade. This work describes a new method to improve the trade-off of the poly(acrylonitrile- co -methyl acrylate) (P(AN-MA))-based membrane for water/oil separation. P(AN-MA) microfiltration (MF) membrane was fabricated via thermally induced phase separation (TIPS) method in this study. Then, some of the –CN groups and –COOCH 3 groups were converted to –COOH groups via hydrolyzing. Finally, the selected wettability was attained by grafting PEI on one side while ZIF-8 was anchored to the other side via self-assembly and in-situ interfacial reaction methods. The ZIF-8/P(AN-MA) hybrid MF membranes are superoleophobic underwater on the PEI side while super-hydrophobic under oil on the ZIF-8 side, which can efficiently and accurately separate oil-in-water and water-in-oil emulsions at a low pressure (0.01 MPa). The separation fluxes of the PEI side were as high as 3053 L/m 2 h and 1035 L/m 2 h respectively, for the surfactant-free mixtures and surfactant-stabilized emulsions. For water-in-oil emulsions, the fluxes were up to 2316 L/m 2 and 878 L/m 2 h on the ZIF-8 side, respectively. The separation efficiency of all the mixtures and emulsions was higher than 97.5 %. Moreover, the Janus membranes showed excellent anti-oil-fouling and anti-water-fouling properties on the two sides of the membranes, as well as remarkable durability during the 10 cycles in oil/water separation. Hence, Janus ZIF-8/P(AN-MA) hybrid MF membranes show potential application prospects in oil/water separation.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 3
·777-785
·
IF 2.349
Jianqiang Wang,Keying Song,Bing Cao,Li Li,Kai Pan
BACKGROUND Polyimide (PI) solvent-resistant nanofiltration (SRNF) membranes were prepared by a two-step method. The polyamic acid (PAA) precursor was synthesized first, and then PAA membranes were obtained via a non-solvent induced phase separation method. Finally, the PAA membranes were transformed into PI membranes by the thermal imidization method. The effect of molecular weight of precursor on the structure and performance of PI membranes was investigated in detail. In addition, the influence of other processing parameters, such as evaporation time and immersion time in the coagulation bath, on the performance of PI membranes prepared from PAA with different molecular weights was also investigated. RESULTS The results showed that the structure of PI membrane varied with PAA molecular weight. The PI membranes prepared from low molecular weight PAA failed to form a defect-free membrane with enough strength, and resulted in high flux but low rejection. Accordingly, PI membranes processed from PAA with high molecular weight retain rejection higher than 90% of FCF with decreased flux. The results also indicated that the optimized molecular weight of PAA should be between 1.23 × 10 5 g mol −1 and 2.44 × 10 5 g mol −1 to prepare defect-free PI membrane for nanofiltration. The results also showed that the performance of the PI membranes can be controlled by adjusting the evaporation time, immersion time, and also the operating pressure. CONCLUSIONS The PAA molecular weight has a great effect on the morphology and performance of PI membranes. A suitable PAA molecular weight is necessary for preparing defect-free PI nanofiltration membrane. © 2015 Society of Chemical Industry
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Dudu Li,Zibo Yang,Lixia Yang,Chao Ma,Mao Ye,Yuxiu Sun,Zhihua Qiao,Aibing Chen
Metal-organic framework (MOF) glass is a promising candidate material for gas separation. However, MOF glasses have low porosity, which is not conducive to prepare high permeance membranes. Herein, we incorporated porous ZIF-7 into ZIF-62 glass membrane to prepare self-supported flux melted glass membranes for gas separation. The introduction of ZIF-7 not only improved pore continuity but also enhanced the porosity of the resulting glass membranes. In addition, the melting nature of ZIF-62 promotes the co-melting of ZIF-7 and thus effectively improves the interfacial compatibility. In such cases, the typical a g [(ZIF-62) 0.7 (ZIF-7) 0.3 ] membrane exhibits the ideal selectivity of 98.6 for H 2 /CH 4 and 35.3 for CO 2 /CH 4 , with H 2 permeance and CO 2 permeance of 120.3 and 43.1 GPU, respectively, exceeding the corresponding Robenson upper bounds. Besides, the a g [(ZIF-62) 0.7 (ZIF-7) 0.3 ] membrane displays good long-term test stability for 48 h under variable pressure conditions. This work may provide a new design concept and experimental support for the construction of new MOF membranes for gas separation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Lin Yu,Jia-Yue Dai,Zhen-Liang Xu,Yin-Xin Fang,Rui Jia,Yong-Jian Tang
Covalent Organic Frameworks (COFs) composite nanofiltration (NF) membrane has high permeation flux and rejection. However, the reaction rate of COFs is relatively slow. Adding acid catalyst is a common method to shorten reaction time. However, the dissatisfactory synthesis rate will lead to irregular structure of COFs materials. In this work, it is the first time to use organobase as a catalyst to prepare COFs composite membrane. The COFs structure will be optimized and the membrane performance can be enhanced. The prepared TpPa-PIP membrane compared with acid catalyzed TpPa-HAc membrane has better permeability, permeance of 89 L m −2 ·h −1 ·bar −1 and CR rejection of 99.54 %. This improvement is because of the TpPa-PIP intermediate made slower reaction speed that improves the overall regularity and crystallinity of COFs. Therefore, it is better method for broadening the application of organobase-catalyzed in preparing membranes.
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
DESALINATION
·
2025
·
IF 9.8
Congcong Zhou,Zhihao Chen,Jingfen Yuan,Yang Jiao,Hongjun Lin,Yanchao Xu
Nanofiltration (NF) membranes are widely used in water treatment and molecular separations, but conventional thin-film composite (TFC) membranes often face a trade-off between permeability and selectivity. Incorporating nanomaterials has shown potential to overcome this limitation, though challenges remain in achieving effective nanoparticle distribution. In this study, a magnetic-field-assisted strategy was developed to fabricate high-performance thin-film nanocomposite (M-TFN) membranes. Hydrophilic Fe 3 O 4 nanoparticles were introduced into the aqueous piperazine phase, and an external magnetic field was applied during interfacial polymerization to direct nanoparticle migration toward the membrane surface. This approach yielded a wrinkled polyamide layer with enhanced surface roughness, reduced thickness, and improved hydrophilicity. The resulting M-TFN membrane exhibited a 2.7-fold increase in water permeability (15.9 L·m −2 ·h −1 ·bar −1 ) compared to the conventional TFC membrane, while maintaining high Na 2 SO 4 rejection (>98 %). It also demonstrated efficient rejection of various dyes, following a molecular weight-dependent size-exclusion mechanism. This work provides a promising route for the design of next-generation NF membranes with simultaneously enhanced flux and selectivity.
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
DESALINATION
·
2020
·
IF 7.098
Jiayu Tian,Hailin Chang,Shanshan Gao,Ruijun Zhang
The potential toxicity of heavy metals arising from the discharge of industrial wastewater has become a serious public concern. Fabrication of a thin film composite (TFC) NF membrane with desirable rejection of heavy metal ions is an attracting route to solve this problem. Hereon, we proposed a facile strategy for fabricating a TFC NF membrane with excellent heavy metal removal. The ratio of PIP and TMC was greatly enlarged by decreasing the concentration of TMC to an exceptional low extent. Thus a polyamide film with weak electronegativity and small pore size was successfully constructed on an ultrafiltration substrate membrane. Comprehensive characterizations were adopted to reveal the micro-variation of the resulted NF membranes when regulating TMC concentration . The optimized membrane prepared only with PIP and TMC can exhibit a high pure water permeability of 14.6 L m −2 h −1 bar −1 , desirable rejection of over 98% against Ni 2+ , Zn 2+ , Cu 2+ , and >92.7% against Cd 2+ . This performance could go beyond most of the reported candidates which were prepared with other complicated methods. The simplicity, low cost and scaling up feasibility of the current strategy is expected to well meet the requirements of industrial production of TFC NF membrane for heavy metal removal.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Tianyu Wang,Langming Bai,Changyong Zhang,Xuewu Zhu,Jiajian Xing,Yuanqing Guo,Jinlong Wang,Dachao Lin,Guibai Li,Heng Liang
In this study, we investigated the scaling behaviors of Fe in the membrane capacitive deionization (MCDI) systems through batch experiments. By analyzing the migration and transformation of Fe in the MCDI system, it was found that Fe scale was deposited on the ion exchange membrane rather than on the electrode. The characterizations of Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) showed that the FeOOH formed in the solution deposited on the anion exchange membrane , while the iron scale on the cation exchange membrane was mainly Fe 2 O 3 . In the presence of 1 mg/L iron ions , the amount of iron ions adsorbed by the MCDI system was about 25% less than that by the capacitive deionization (CDI). However, at 10 mg/L iron ions, the amount of iron ions absorbed by the MCDI system was almost twice that by the CDI system. This was because that the high concentration of iron ions produced a large number of yellow flocs which were adsorbed by the cation exchange membrane. Ion exchange membrane increased the adsorption capacity of the CDI system, but it did not alleviate the scaling caused by Fe.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Di Xu,Zhigao Zhu,Guangming Tan,Xiangyang Xue,Jiansheng Li
Scaling in membrane distillation (MD) is inevitable in concentrating hypersaline wastewaters. Although adding antiscalants in hypersaline brines can effectively mitigate membrane scaling, the effectiveness and underlying mechanisms in preventing scaling on differently wettable membrane surfaces with different functional-group antiscalants have rarely been reported. Herein, the hydrophobic, superhydrophobic and Janus membranes with ultrathin scale inhibition layer were elaborately designed to elucidate the efficiencies of functional groups of antiscalants in preventing gypsum scaling on differently wettable membrane surfaces. The results show that the superhydrophobic and Janus membranes are the most effective in retardation of membrane scaling in the presence of a single antiscalant with carboxyl or amino functional groups, respectively. Besides, the performance of the superhydrophobic membrane can be further improved while the Janus membrane was continuously declined as amino and carboxyl-functional-group antiscalants were simultaneously added to the feed gypsum solution. A set of characterization analyses revealed that the significant improvement in membrane gypsum scaling resistance is ascribed to the obstruction of scale precursors to nucleation. Meanwhile, the physicochemical characteristics of antiscalants also contribute to reducing the salt deposited on the MD membrane surface in the supersaturated brine. This work provides new insight into the structure design of membrane and antiscalants tailored to MD for concentrating hypersaline brines with high water recovery and robust salts rejection efficiency.
研究领域:
环境工程
·
膜科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Pharmaceutics
·
2023
·Vol. 15
·期 3
·758
·
IF 5.4
Tingfeng Xu,Huijie Li,Yi Xia,Sheng Ding,Qingliang Yang,Gensheng Yang
As an oral mucosal drug delivery system, oral films have been of wide concern in recent years because of their advantages such as rapid absorption, being easy to swallow and avoiding the first-pass effect common for mucoadhesive oral films. However, the currently utilized manufacturing approaches including solvent casting have many limitations, such as solvent residue and difficulties in drying, and are not suitable for personalized customization. To solve these problems, the present study utilizes liquid crystal display (LCD), a photopolymerization-based 3D printing technique, to fabricate mucoadhesive films for oral mucosal drug delivery. The designed printing formulation includes PEGDA as the printing resin, TPO as the photoinitiator, tartrazine as the photoabsorber, PEG 300 as the additive and HPMC as the bioadhesive material. The influence of printing formulation and printing parameters on the printing formability of the oral films were elucidated in depth, and the results suggested that PEG 300 in the formulation not only provided the necessary flexibility of the printed oral films, but also improved drug release rate due to its role as pore former in the produced films. The presence of HPMC could greatly improve the adhesiveness of the 3D-printed oral films, but excessive HPMC increased the viscosity of the printing resin solution, which could strongly hinder the photo-crosslinking reaction and reduce printability. Based on the optimized printing formulation and printing parameters, the bilayer oral films containing a backing layer and an adhesive layer were successfully printed with stable dimensions, adequate mechanical properties, strong adhesion ability, desirable drug release and efficient in vivo therapeutic efficacy. All these results indicated that an LCD-based 3D printing technique is a promising alternative to precisely fabricate oral films for personalized medicine.Keywords:3D printing;oral films;liquid crystal display;bilayer films;oral mucosal drug delivery
研究领域:
药剂学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）