JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Die Zou,Yuzhe Zhou,Wentao Yan,Yong Zhou,Congjie Gao
Polyvinyl alcohol (PVA) has the advantages of excellent hydrophilicity, good film-forming properties and competitive prices, thus it is an ideal membrane material. However, rare reports about PVA membrane for monovalent/divalent salt separation, which is widespread in chemical industry can be found. Herein, we developed a novel boric acid (BA)-loosened PVA/glutaraldehyde (GA) membrane with high flux and selectivity for monovalent/divalent salt separation. Our idea is based on the fact that BA and PVA can form a complex due to some special interactions (including chemical bonding and H-bonding). In general, PVA membrane needs to crosslink with GA for obtaining a high salt rejection. However, PVA/GA membrane is usually too compact, leading to a low membrane water flux. The formation of PVA/BA complex reduced PVA/GA membrane crystallinity and increased its pore size, thereby improving the membrane flux obviously (by 16 times). PVA/GA/BA membrane flux is high: under 7.5 bar, its pure water flux was 20.20 L/m 2 ·h. Besides, a high monovalent/divalent salt selectivity (64.21) was also achieved since the rejection of monovalent salt (NaCl) declined sharply and meanwhile the high rejection of divalent salt (Na 2 SO 4 ) was maintained. Moreover, the developed PVA/GA/BA membrane exhibited a good alkali resistance, antifouling performance and stability of permselectivity, which has a bright application prospect. This work may pave a novel avenue to develop high-performance PVA monovalent/divalent salt separation 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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Haohang Fang,Qianqian Yu,Di Xie,Yiyan Cai,Jianping Sun,Boxi Chen,Houkai Huang,Xin Li,Siyang Dai,Shaohong Shi,Yiqiang Wu,Fangchao Cheng
Membrane filtration technology demonstrates excellent continuous processing capability in organic wastewater treated processes, which is usually applied in continuous industrial processes. However, it still faces a contradiction between membrane flux and treatment efficiency. In this study, a flexible wood-based photocatalytic membrane with high membrane flux and exceptional photofenton performance was developed via partial fragment wood components and uniform loading of multi-metal oxide nanocatalysts, which breaks mentioned contradiction. The homogeneous and efficient wood-based dual-function water filtration/photofenton system was established by leveraging the directional porous structure of wood in conjunction with the nanocatalysts while adjusting their ratios, enabling effective purification of highly concentrated mixed organic wastewater. Under one solar intensity and negative pressure filtration (0.03 MPa), the system treated a mixed solution containing Rhodamine B, phenol , and tetracycline at a concentration of 280 mg L −1 with the removal efficiencies of 100 %, 93.4 %, and 90.2 %, respectively, and the membrane flux could up to 315.3 Lm −2 h −1 within one hour. The membrane showed a good recycling performance, and the decay rates were all below 5 % after five cycles. This wood-based dual-function water filtration/photo-Fenton system provides a new approach for the continuous dynamic treatment of high-concentration organic wastewater on an industrial scale.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Hongming Fu,Kaili Xue,Zhaohao Li,Heng Zhang,Dan Gao,Haiping Chen
Excessive CO 2 emissions contribute to global warming, which may cause potential threat to survival of humans and other creatures, and it is necessary to take effective measures to curb CO 2 emissions. Gas-liquid membrane contact CO 2 separation technology is an emerging CO 2 capture technology that combines advantages of membrane separation and chemical absorption . In this paper, differences of CO 2 capture performance between ceramic and polytetrafluoroethylene (PTFE) membranes with pore size of 10 nm and 100 nm are investigated comprehensively. The morphological structure, pore size distribution, wettability and membrane flux of ceramic and PTFE membranes are analyzed by membrane characterization. Moreover, with monoethanolamine (MEA) as absorbent, CO 2 capture performance under different operating parameters (e.g., absorber flow rate and temperature, gas flow rate and pressure) is investigated through experiments based on ceramic and PTFE membrane modules . The CO 2 capture efficiency of ceramic and PTFE membrane is 94.7% and 99.3%, respectively. However, the mass transfer rate of ceramic membrane is much higher than that of PTFE membrane. The results show that ceramic membrane exhibits favorable CO 2 capture performance under appropriate operation parameters. This paper will provide theoretical and technical references for subsequent industrial CO 2 capture applications.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zhangfu Yuan,Lu Mei,Shanshan Xie,Linfei Zhao,Hongxin Zhao,Bingsheng Xu
ABSTRACT Polyethylene porous filter tube membranes were prepared by powder sintering method. The micro-structure of the tubular membrane, the effect of inorganic particles, and emulsified oil on membrane fouling were studied. The membrane flux variation curves were analyzed to further reveal the fluxing mechanisms. The results showed the membrane was composed of particles with the size of 10–60 μm, and there were many irregularly shaped three-dimensional through pores with the size of 20–70 μm in its cross-section. For inorganic particle dispersion filtration, the larger the dispersion concentration was, the greater the membrane flux dropped, and the smaller the irreversible fouling was; the smaller the inorganic particle size and the higher the filtration flow rate were, the greater the membrane flux dropped and the greater the irreversible fouling were; The analysis showed that at the beginning of filtration, the membrane first underwent complete pore blocking, and as the filtration process proceeds, the contamination pattern of the membrane changed, and cake filtration blocking occurred. For emulsified oil filtration, the larger the pH value was, the smaller the zeta potential, and the smaller the emulsified oil was, the greater the decreased in membrane flux and the greater the irreversible fouling was. For the filtration of turbid ring water with inorganic particles and emulsified oil, the membrane flux decreased less than the filtration with emulsified oil only; as the concentration of emulsified oil increased, the irreversible fouling tended to rise.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Haiyang He,Yulei Liu,Lu Wang,Wei Qiu,Dong Li,Zhicen Liu,Jun Ma
Ferrate(VI) pretreatment can effectively alleviate membrane fouling during the ultrafiltration (UF) process, while instability and high expenditure limit its application. This study discovered that the cheap NaClO reagent would improve the performance of ferrate(VI) pretreatment, i.e., establishing Fe(VI)/NaClO (FC) process. 20 μM of Fe(VI) group can increase J / J 0 from 0.323 to 0.391, while the optimization process of 20 μM Fe(VI)/4 μM NaClO [FC (5:1)] increased it to 0.491 at the end of cycle 1 filtration. Meanwhile, the reversible and irreversible membrane fouling resistance decreased by 50% and 56% in FC (5:1). This was attributed to the suppression of ferrate(VI) decomposing and in-situ formation of more dispersed ferric nanoparticles in FC process [730.33 nm in Fe(VI) and 606.80 nm in FC (5:1)] by applied NaClO. The rejection ratio of dissolved organic carbon (DOC) increased from 27.18% of Fe(VI) group to 40.34% of FC (5:1) due to the repulsive interaction amplification of acid-base (AB) interaction energy. That was derived from the hydrophilia promotion of the treated sample and the electrical property evolution of in-situ formed ferric nanoparticles by NaClO. It suggested that AB interaction energy, presenting repulsive interaction in membrane-foulants and foulants-foulants, was a major role in Fe(VI) group and FC process. There was no more side effect induced by FC pretreatment, which was confirmed by the result that FC caused no increase in the disinfection by-products (DBPs) formation potential. The present study provided insight into improving the effect of ferrate(VI) pretreatment without inducing side effect, and reduced the costs of ferrate(VI) pretreatment during the process of UF.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Mingrui He,Runnan Zhang,Yanan Liu,Lin Fan,Qi Zhang,Yanlei Su,Zhongyi Jiang
Persistent high-flux membranes were fabricated via kinetic and thermodynamic synergistic manipulation of surface segregation process. Poly (ether sulfone) (PES) was utilized as the bulk membrane material, poly (N-vinyl pyrrolidone- alt -maleic anhydride)- b -poly(styrene) (P(NVP- alt -MAH)- b -PS) with polyethylene glycol (PEG) was utilized as the precursor of surface segregation modifiers (SSMs). In casting solutions , the SSMs were in-situ synthesized through the alcoholysis reaction between the anhydride groups in P(NVP- alt -MAH)- b -PS and the hydroxyl groups in PEG, and then the membranes were fabricated with the non-solvent induced phase separation of PES and the surface segregation of the SSMs. The high mole ratio of hydrophilic/hydrophobic segments and adjustable crosslinking degree of the SSMs afforded the sufficient surface enrichment of the hydrophilic segments in the SSMs, as a result, the coverage of PEG segments on the membrane surfaces reached as high as 40.0 at%. Meanwhile, the strong interactions between the SSMs and PES and the high molecular weight of the SSMs afforded the durable surface enrichment of the SSMs, as a result, the water contact angle and the O/C ratio of the membrane surfaces were nearly unchanged after scoured by water for 30 days. Moreover, the crosslinked SSMs interfered and delayed the solidification of PES, endowing the membranes with higher porosity and bigger pore sizes. Accordingly, the membranes displayed persistent high-flux of 230 Lm −2 h −1 bar −1 in ternary-circle ultrafiltration experiment.
研究领域:
材料科学
·
膜技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Wentao Yan,Mengqi Shi,Zhi Wang,Yong Zhou,Lifen Liu,Song Zhao,Yanli Ji,Jixiao Wang,Congjie Gao
Hollow porous nanoparticles were proposed to transform the skin layer structure for enhancing the performance of reverse osmosis (RO) membrane in this work. Amino-modified hollow mesoporous silica nanospheres (AHMSS) with a size from 110 to 130 nm were successfully prepared via the hard template method . AHMSS were added in the organic phase and then incorporated into the RO membrane skin layer after the interfacial polymerization process. The hydrophilicity of RO membrane was improved by AHMSS. The performance evaluation results showed that AHMSS improved the RO membrane flux (improved by 41.5%) with rejection decreasing slightly. Amino-modified mesoporous silica nanospheres without hollow cores were also prepared and incorporated into the RO membrane skin layer to investigate the effects of the hollow cores of AHMSS on the membrane performance . The results showed that the hollow cores of AHMSS contributed to the improvement of membrane performance. This work demonstrates that AHMSS have huge potential in preparing RO membranes with both high flux and high rejection.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haoliang Xiao,Ning Zhang,Jiaxiang Li,Min Zhong,Pengchao Xie,Songlin Wang,Jun Ma
Radical-based cleaning technology is regarded as an efficient solution for fouled membranes. Nevertheless, limited studies have investigated the inevitable residual fouling and its effects on membrane filtration under prolonged use of these methods. To explore, the peroxymonosulfate/hydroxylamine/ferrous (PMS/NH 2 OH/Fe(II)) system, known for generating abundant radicals, was employed in this study. With the help of hydroxyl radical (HO · ), PMS/NH 2 OH/Fe(II) effectively restored the flux of membranes fouled by humic acid (HA), bovine serum albumin (BSA), and sodium alginate (SA) in dead-end filtration to 96 %, 97 %, and 103 % of their original values, respectively. Over cyclic radical cleanings, the membrane flux increased to 181 %∼219 % of the original flux. However, the retention performance remained nearly unchanged, suggesting a breakthrough in the selectivity-permeability trade-off. Comprehensive characterization of the membranes indicated that the maintenance of retention performance relied on the reduced porosity due to residual fouling, while the increased flux was attributed to the carboxylation modification of residual fouling. Supported by this mechanism, PMS/NH 2 OH/Fe(II) maintained satisfactory cleaning efficiency during practical cleaning of East Lake-fouled membranes. Overall, this study uncovers how repeated radical-based cleaning affects membrane performance, offering foundational insights for the application of this technology.
研究领域:
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qiming Zhang,Jiajun Hu,Chen Yang,Jixiang Li,Nan Liu,Wenshan Guo,Chaomeng Dai,Liang Wang,Yun Tian,Huu Hao Ngo
In this study, researchers successfully developed a novel Magnetic Molecularly Imprinted Polymer of Boronate Affinity Controllable-Oriented Dextran (MMIP-Dextran) to enhance membrane flux by selectively adsorbing polysaccharide-type substances. The structure and components of the MMIP-Dextran were thoroughly investigated using various techniques such as Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM), Brunauer-Emmett Teller (BET), Fourier Transform Infrared (FT-IR), and Thermogravimetric Analysis (TGA). Batch experiments were conducted to assess the adsorption performance and mechanisms. Results showed that the MMIP-Dextran exhibited a high adsorption capacity of 31.2 mg g −1 and good specific recognition performance (imprinting factor, IF=2.83) for the Dextran template. Furthermore, the MMIP-Dextran had a superior polysaccharide adsorption capacity of 22.10 mg g −1 compared to the Non-Imprinted Polymer (NIP) in soluble microbial products (SMPs) derived from a bioreactor , showing a 2.45-fold improvement. Meanwhile, the Specific Filtration Resistance (SFR) tests indicated that the membrane flux improvement by MMIP-Dextran (15.2 %) is 2.1 times better than NIP (7.2 %). Adsorption kinetics and thermodynamics analyses revealed that the spontaneous adsorption process was predominantly governed by chemically rate-limiting steps. Density Functional Theory (DFT) analysis further revealed that the spatial configuration transformation of the Boric Acid Ligand (BAL) played a crucial role in the adsorption/desorption process. Overall, this study offers a promising approach to promoting the permeate flux of membrane and provides a deeper understanding of the antifouling mechanism using MMIPs.
研究领域:
环境科学
·
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Caiyun Hou,Lei Du,Yao Li,Meiwei Guo,Jiti Zhou,Sen Qiao
With growing demand for freshwater resources, membrane distillation (MD) attracts intensive attention owing to the possibility of reclaiming almost 100% freshwater with superhydrophobic membranes as the pivotal separation units. Current superhydrophobic membrane still suffers relatively complex preparation process and limited membrane flux. Herein, we developed a promising route to fabricate a high-flux superhydrophobic poly(vinylidene fluoride) (PVDF) membrane by a simple solute and solvent co-crystallization (SSCC) method, which endowed the membrane ultra-high porosity and flux. We also found that the pore size of superhydrophobic membrane can be adjusted by controlling the crystallization process of DMSO, which gave rise to membrane higher flexibility. The membrane exhibited the outperforming desalination performance even in multiple harsh environments including different temperature, salty concentration, and pH, with/without humic acid. The membrane also displayed distinguished anti-fouling performance and long-term stability, which is quite significant for practical application.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ling Yu,Kuiling Li,Yong Zhang,Jun Wang,Guoliang Zhang
Development of acid resistant nanofiltration membranes (ARNFMs) with high metal rejection, high flux and low molecule weight cut-off (MWCO) remains a big challenge. The separation performance of polyamine ARNFM is partially limited by the dense structure caused by the high concentration of organic phase solution. Herein, in this work, a novel effective post-treatment of citric acid (CA) was utilized to further improve the separation property of dually charged polyamine ARNFMs with low MWCO. An appropriate CA post-treatment (1.5 mol/L, 30 min, 65 °C) could gently remove off the oligomers and CA molecules would react with the redundant protonated/non-protonated amino, imine and hydroxyl groups of the polyamine NFM. Therefore，after the post-treatment, the membrane flux was enhanced 7.1 times with a high MgCl 2 rejection (97.6%) and a low MWCO around 220 Da. Furthermore, CA post-treatment not only had no significant influence on the acid stability of this membrane, but would also protect the membrane from the drastic effect of HCl (hydrolyze -Cl into –OH) in turn. All the results indicated that CA post-treatment has positive effects on polyamine ARNFMs, and the resulted dually charged polyamine ARNFMs have a good application potential for acidic wastewater treatment .
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2019
·Vol. 6
·期 3
·645-655
·
IF 4.195
Tao Xu,Li Cui,Honghan Li,Peng Zou,Jiyan Liang
Membrane fouling is a challenging issue in terms of ultrafiltration application. However, as a novel water treatment technology, the impact of electrocatalytic oxidation on membrane fouling is still debated. Thus, in this study, to overcome this problem, the application of electrocatalytic oxidation pretreatment was evaluated for mitigating membrane fouling by natural organic matter. The influence of natural organic matter (NOM) fractions on the control efficiency was also investigated using humic acid (HA), bovine serum albumin (BSA), and sodium alginate (SA). The performance was examined through normalized flux decline, fouling resistance analysis, EEM fluorescence spectroscopy and the classical membrane fouling model. The results indicate that the electrocatalytic oxidation pretreatment exhibited a remarkable synergistic effect in the reduction of NOM, with a reduction in the DOC of 53% and 55% for HA and SA, respectively. However, the electrocatalytic oxidation pretreatment exhibited limited influence on BSA. The electrocatalytic oxidation pretreatment efficiently reduced both the reversible and irreversible fouling resistances and increased the membrane flux. The fouling mitigation by electrocatalytic oxidation was attributed to the oxidation of organic matter by ˙OH. The experimental results are expected to provide a feasible strategy for electrocatalytic oxidation to mitigate fouling.
研究领域:
环境工程
·
水处理技术
·
膜科学
✓ 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）