Membranes
·
2021
·Vol. 11
·期 3
·200
·
IF 4.106
Ming Cai,Chunfang Xie,Huazhao Zhong,Baoming Tian,Kai Yang
Organic fouling in the nanofiltration (NF) process, which is a non-thermal technology to recover active components, is a critical problem limiting its applications. This study seeks to identify the anthocyanins on the NF membrane and explore their fouling mechanisms during concentration of blueberry extracts. Seven kinds of monomeric anthocyanins in foulants—delphinidin-3-O-galactoside, delphinidin-3-O-glucoside, delphinidin-3-O-arabinoside, cyanidin-3-O-galactoside, petunidin-3-O-galactoside, peonidin-3-O-glucoside, and malvidin-3-O-glucoside—were identified. Moreover, chalcone, myricetin derivative, and an unknown substance with [M+H]+at m/z 261.1309, which is the fragment ion corresponding to the break of glycoside bond of anthocyanins, were obtained. Interactions between anthocyanins and membrane made from polyamide were principally governed by the CH-π and π-π stacking of aromatic rings, the establishment of hydrogen bonds, and electrostatic interaction. This study will be helpful to further control fouling and choice of cleaning agents in concentration of anthocyanins-rich extracts.Keywords:anthocyanins;nanofiltration;fouling mechanisms;interactions;membrane
研究领域:
食品科学
·
生物化学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 2
·655-665
·
IF 3.119
Qin-Mei Xiong,Jian Liu,Miao Liu,Cai-Hong Shen,Xue-Chun Yu,Chong-De Wu,Jun Huang,Rong-Qing Zhou,Yao Jin
Sterilization and clarification are essential to produce wine of high quality and stability, microfiltration is a serious candidate for both purposes. In this work, microfiltration of fermented mulberry wine was evaluated for the first time. Four different commercial membranes, of two different materials (PES, PVDF) and two different nominal pore sizes (0.22 μm and 0.45 μm) were employed. Pore blocking model was used to identify the fouling mechanism, foulant constituents were revealed by FT-IR spectra. The effect of microfiltration on permeate quality of mulberry wine was also involved. The results indicated that cake formation was the dominant mechanism during steady-state of mulberry wine microfiltration, independently on the membrane property. The fouling layer was mainly composed of protein and polysaccharides, which induced basically reversible overall filtration resistance. Microfiltration delivered a superior clarity, highly polydisperse and light-color mulberry wine with a satisfactory sterilization stability. It preserved the main basic properties and organic acid contents of mulberry wine while resulted in certain loss of volatile compounds, especially esters and alcohols. This work has provided a scientific reference for producing mulberry wine, a modern functional beverage.
研究领域:
食品科学
·
生物化学
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DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 6
·2928-2940
·
IF 3.049
Hao Guo,Jun Huang,Rongqing Zhou,Chongde Wu,Yao Jin
Refinement to remove fermented mash residue is essential for obtaining clarified, stable and high-quality soy sauce. In this study, raw soy sauce microfiltration was investigated. Four widely-used microfiltration membranes were employed: ceramic, polyethersulfone (PES), polyvinylidene fluoride (PVDF) and mixed cellulose ester (MCE). Membrane fouling mechanisms were identified based on the blocking filtration model, indicating that the dominant fouling mechanism during soy sauce microfiltration was cake formation on the membrane surface. Microfiltration delivered highly dispersed soy sauce having superior clarity and a light color, with satisfactory sterilization quality, and preserved well the NaCl, reducing sugar, total acid and amino nitrogen content, leading to a product having a longer shelf life as compared to pasteurization. The loss of volatile compounds after refinement (microfiltration and pasteurization) was not neglected, particularly the ester groups (total loss of 76.3% to 96.4%), which affected the aroma profile of the soy sauce; all the samples from microfiltration seemed to lack the floral aroma. Ceramic membrane filtration and pasteurization exhibited relatively good preservation of the aroma of soy sauce, which then obtained the best scores in sensory analysis.
研究领域:
食品科学
·
生物工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yantao Song,Meng Yan,Zixuan Xu,Benqiao He,Biao Wu,Jianxin Li,Zhenyu Cui
In this study, the 3-Aminopropyltriethoxysilane (APTES) was first grafted onto TiO 2 nanoparticles (APTES-TiO 2 nanoparticles), which were then introduced the membrane surface by reacting with anhydride on the membrane surface and Schiff base reaction with the PEI-TA. There are two types of hollow fiber hybrid membranes with varying nanoparticle distributions were constructed. The influence of hybrid mode on the ability of anti-oil fouling was researched. The results indicated that the PVDF@TiO 2 hybrid membrane has a flux recovery rate of 96.68 % and a total flux decline rate of 15.52 %, indicating a good anti-emulsified oil fouling performance. By characterizing the anti-oil droplets adhesion, water-binding capacity, surface charge of membrane and concentrate system coacervate size, the coalescence ability of the hybrid membrane to the oil droplets and the spreading behavior of oil droplets on the surface were uncovered. Ultimately, the anti-fouling mechanism “hydration layer &rigid layer obstruction-electrostatic coalescence” was proposed, which can reasonably explain the weakness of the interplay between the membrane surface and oil droplets, thus slowing down the attaching and spreading of emulsified oil droplets. This study laid the foundation for developing hybrid membranes with high resistance to emulsified oil fouling ability. The proposed anti-fouling mechanism can provide new ideas for the efficient purification of oily wastewater.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Zhang,Weicheng Fu,Zihao Wang,Shuang Wu,Zhipeng Wang,Yaoming Wang
In this study, organic solutions (30–120 mg/L HA, BSA or SA) and composite solutions (5.93–10.15 wt% inorganic salts with 75 mg/L HA, BSA or SA) were used to investigate the membrane fouling behavior in the vacuum membrane distillation (VMD) system. The different permeate flux attenuation and fouled membrane morphology implied distinct membrane fouling mechanisms during VMD process. Furthermore, we employed the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory as an effective approach to analyze membrane fouling mechanisms. The results showed that the total interaction energy was negative (attraction) within the separation distance of 1–2 nm by applying the XDLVO approach, indicating that a pristine membrane was more prone to fouling. Finally, we elucidated distinct membrane fouling mechanisms in the VMD system. The inorganic feed solution readily induced inorganic fouling on the membrane surface and pore wetting, while organic feed solution and combined feed solution did not cause membrane wetting, conversely, only organic fouling and combined fouling were identified on the membrane surface. This study was expected to facilitate understanding of membrane fouling mechanisms in the VMD process.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 27
·16268-16274
·
IF 3.361
Qin Jiang,Zi-Yu Liu,Wei Guo,Zengping Su,Wangjing Ma,Lu Zhang,Sui Zhao
Membrane fouling has always been a tough issue that is urgent to solve. Electrolytes which are prevalent in wastewater have a major influence on membrane fouling. Therefore, it is of great significance to understand the role and fouling mechanism of electrolytes in the membrane fouling process. In this work, the zwitterionic membrane is used to process hydrolyzed poly(acrylamide) (HPAM) with the addition of electrolytes (CaCl2, NaCl). Meanwhile, the effect of different electrolytes on the zwitterionic membrane fouling process by hydrolyzed poly(acrylamide) (HPAM) is systematically investigated. It was found that the flux recovery ratio (FRR) of the zwitterionic membrane is nearly 100% after treating HPAM with the addition of electrolytes. Therefore, molecular dynamics (MD) simulations were applied to illustrate the impact of electrolytes on the change of foulant structures and confirm the consequent effect of electrolytes on membrane fouling. According to the experiment and MD simulation results, it is found that the positive ion layer which exists between the HPAM and zwitterionic surface results in the excellent fouling resistance performance of the zwitterionic membrane. The zwitterionic membrane fouling mechanism is analyzed, which is helpful to the understanding of zwitterionic membrane fouling in high salinity wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Kang Gao,Yanlei Su,Linjie Zhou,Mingrui He,Runnan Zhang,Yanan Liu,Zhongyi Jiang
Antifouling mechanisms are critical to membrane structure-property relationship. Currently, most researches focus on either passive fouling-resistant, fouling-release mechanisms or active antibacterial mechanism, the integration of active and passive antifouling mechanisms is much less explored. In this study, a novel modifier bearing three functional segments was designed and utilized for antifouling and antibacterial membrane surface construction. In detail, a block-like copolymer comprising low surface energy poly(hexafluorobutyl methacrylate) (PHFBM), hydrophilic poly(poly(ethylene glycol) methyl ether methacrylate) (PEGMA) and antibacterial poly[2-(methacryloyoxy)ethyl trimethylammonium chloride] (PMTAC) quaternary ammonium salt segments was prepared via free radical polymerization . The copolymer was employed for fabricating PVDF membranes by non-solvent induced phase separation method. The surface enrichment of copolymer was confirmed by XPS analysis . The PHFBM and PEGMA segments created passive fouling-release, fouling-resistant mechanisms whereas the PMTAC segments created active antibacterial mechanism on PVDF membrane surfaces. When utilized for oil/water emulsion filtration, the total flux decline ratio of PVDF/PHFBM-PEGMA-PMTAC membrane was as low as 6.3% and the flux recovery ratio reached nearly 100%. Besides, the antibacterial activity against E. coli and S. aureus was higher than 99%. Hopefully, the strategy of active-passive integrated mechanisms in this study can be applicable to construct diverse antifouling surfaces for water treatment related applications.
研究领域:
材料科学
·
环境工程
·
生物医学
✓ 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
DESALINATION
·
2020
·
IF 7.098
Yu Xia,Zegang Wang,Li-Ye Chen,Si-Wei Xiong,Pan Zhang,Pei-Gen Fu,Jing-Gang Gai
The anti-fouling polyamide (PA) reverse osmosis (RO) membranes modified by hydrophilic polymer are trapped in the problems of declined flux, single anti-fouling mechanism, high cost or complex fabrication. Here the nano-sized sodium alginate/Cu 2+ hydrogel prepared with the layer-by-layer (LBL) method was firstly applied for PA RO membrane modification to solve these contradictions. The combination of passive and active antifouling capabilities can be imparted by the polyelectrolyte hydrogel cross-linked with metal ions . In addition, remarkable transport properties can be achieved by brilliant hydrophilicity of hydrogel layer and LBL method which can control the thickness of the modified layer at nanometer level to minimize the transmembrane resistance of water molecules. The modified membrane possesses a water flux of 71.40 LMH up to 192.97% of the unmodified membrane without sacrificing salt rejection at 25 °C, 1.6 MPa. In the BSA and DTAB fouling tests, the flux recovery rate of the modified membrane was 26.44% and 29.14% greater than that of the unmodified membrane, respectively. Moreover, the modified PA membrane exhibited great bactericidal potential to S. aureus and E. coli . Besides prominent comprehensive performance, this strategy is low cost and simple in operation, shining a light on preparing new generation of high-performance RO membrane.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Ying Wan,Pengchao Xie,Zongping Wang,Jingwen Wang,Jiaqi Ding,Raf Dewil,Bart Van der Bruggen
In this study, the effects of UV/chlorine pretreatment on ultrafiltration (UF) membrane fouling derived from different fractions of natural organic matter (NOM) were studied and compared. Three model organic compounds including humic acid (HA), sodium alginate (SA) and bovine serum albumin (BSA) were employed to represent different NOM fractions in natural surface water. The results suggest that membrane fouling induced from HA, SA and HA-SA-BSA mixture could be effectively mitigated by UV/chlorine pretreatment, which could be further improved by increasing the chlorine dose. Although UV irradiation alone severely aggravated BSA fouling, the addition of chlorine (0.0625 mM) to the pretreatment process could effectively avoid the fouling. The alleviation of membrane fouling is primarily ascribed to the reduction of molecular weight (MW) of organic compounds, and the decomposition of unsaturated organic species, thereby reducing the accumulation of organics on the membrane surface and pores. This is confirmed by the reduction of UV 254 and fluorescent components in the feed solution and the increase of DOC in the permeate after UV/chlorine pretreatment. Membrane fouling during the filtration of untreated HA, SA, and HA-SA-BSA mixture was occupied by cake filtration and intermediate pore blocking, while UV/chlorine pretreatment led to the exacerbation of pore blocking at the initial filtration stage. The initial fouling mechanism of untreated BSA was mainly governed by complete blocking, which shifted to intermediate pore blocking after UV/chlorine pretreatment.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zi-Yu Liu,Qin Jiang,Zhiqiang Jin,Zhenyu Sun,Wangjing Ma,Yanlei Wang
The antifouling process of the membrane is very vital for the highly efficient treatment of industrial wastewater, especially high salinity wastewater containing oil and other pollutants. In the present work, the dynamical antifouling mechanism is explored via molecular dynamics simulations, while the corresponding experiments about surface properties of the zwitterionic monomer-grafted polyvinylidene difluoride membrane are designed to verify the simulated mechanism. Water can form a stable hydration layer at the grafted membrane surface, where all the simulated radial distribution function of water/membrane, hydrogen bond number, water diffusivity, and experimental oil contact angles are stable. However, the water flux across the membrane will increase first and then decrease as the grafting ratio increases, which not only depends on the reduced pore size of the zwitterionic monomer-grafted membrane but also results from water diffusion. Furthermore, the dynamical fouling processes of pollutants (taking sodium alginate as an example) on the grafted membrane in water and brine solution are investigated, where both the high grafting ratio and electrolyte CaCl2 can enhance the fouling energy barrier of the pollutant. The results show that both the enhanced hydrophilic property and the electrostatic repulsion can affect the antifouling capability of the grafted membrane. Finally, the ternary synergistic antifouling mechanisms among the zwitterionic membrane, electrolyte, and pollutant sodium alginates are discussed, which could be helpful for the rational design and preparation of new and highly efficient zwitterionic antifouling membranes.
研究领域:
材料科学
·
环境工程
·
计算生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Sushuang Li,Jianquan Luo,Xiaofeng Hang,Shiguang Zhao,Yinhua Wan
Polycyclic aromatic hydrocarbons (PAHs), as a group of micropollutants with high toxicity, are commonly detected in the environment and difficult to remove. In this work, five commercial polyamide (PA) nanofiltration (NF) membranes were used to treat three PAHs in the synthetic solution or coking wastewater and their removal mechanisms were discussed. By comparing water permeability and PAHs rejections of the NF membranes before and after PAHs adsorption, we found that the PAHs adsorption into the membrane was the dominant rejection mechanism at the initial filtration stage. Due to the limited adsorption capacity and increasing diffusion of PAHs in the membrane, the PAHs rejections would drop rapidly and then reach steady. Size exclusion mechanism was also important to PAHs removal by NF, especially for PAHs with weaker polarity and higher molecular weight. Although the polysulfone intermediate layer could adsorb substantial PAHs resulting in an increase of filtration resistance, the pore blocking and narrowing effects on the PA separation layer were still the main reasons for the permeability loss of NF membranes. However, the glucose rejection did not change obviously after the PAHs adsorption in the membrane. Through analyzing porosity and pore size distribution of the NF membranes before and after PAHs adsorption, we found that for the NF membrane with small pore size and narrow pore size distribution (e.g. NF270), PAHs adsorption produced indiscriminate pore blocking effect, and thus the average pore size and its distribution as well as glucose rejection did not change obviously after fouling formation; while for the NF membrane with large pore size and wide pore size distribution (e.g. NF10), PAHs adsorption occurred more seriously in the larger pores leading to a pore narrowing effect, but the reduced pore size was still too large to affect glucose rejections. The outcomes of this work suggested that the PAHs adsorption in both separation and intermediate layers of NF membranes should be avoided, and the NF membrane with narrow pore size distribution was preferred for PAHs removal.
研究领域:
环境工程
·
水处理
·
膜技术
·
污染物去除
✓ 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）