DESALINATION
·
2022
·
IF 11.211
Weilong Song,Shuyue Liu,Ming Xie,Pin Zhao,Xinhua Wang
Using seawater desalination concentrate (SC) as DS of FO for simultaneous wastewater pre-concentration and disposal of waste SC has presented good application potential. Nevertheless, knowledge of membrane fouling mechanisms in FO process using SC as DS, especially the influence of SC on membrane fouling, is still inadequate, mostly due to the limited operation time in previous studies. Hence, present study focused on membrane fouling behaviors in FO with SC as DS, with particular focus on impact of SC in long-term operation. The results indicated that using SC as DS induced noticeable aggravation of membrane fouling on both active layer (AL) and support layer (SL) sides of FO membrane in long-term operation, which was not observed in short-term operation. On AL side, accumulation of Ca 2+ and Mg 2+ via back-diffusion from SC became significant during long-term operation, thereby substantially altered fouling behavior on AL side, resulting in more refractory membrane fouling. On SL side, calcium-based scaling was formed both in and within the porous matrix of SL during long-term operation. Accordingly, a combined membrane cleaning strategy (NaClO for AL + HCl and EDTA for SL) was developed. The results could facilitate the application of SC as an economical and feasible DS source.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Lei Xu,Zhenzhen Xu,Simon Kelly,Xiaojun Liao
Untargeted metabolomics was used to investigate the differences between orange juices from concentrate or not. Although no distinctive separation could be observed from principal component analysis for all samples, student’s t -test, fold change, orthogonal projection to latent structures discriminant and detection rate analyses were conducted to find the latent potential markers. Subsequently, 91 and 42 potential markers were defined in positive/negative mode. Thirteen of them, l -glutamine, carvone, erucamide, lysoPE (16:0/0:0), oleic acid, α-linolenic acid and 7 tripeptides (reported for the first time in orange juice) were identified with standards. A partial least squares discriminant analysis model, based on the potential markers in positive mode by direct analysis in real time mass spectrometry-quadrupole time of flight (DART-QTOF) with 9 s acquisition time, was constructed and validated with 97% and 95% accuracy for training and test. The model was applied to commercial samples successfully, and an NFC brand was found highly suspicious.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Membranes
·
2025
·Vol. 15
·期 5
·129
·
IF 3.6
Shichang Xu,Long Zhang,Zhen Zhang,Lixin Xie,Wen Zhang
In this study, the integrated process of reverse osmosis (RO) and electrodialysis (ED) is developed to concentrate the dilute solution of acetic acid (HAc). The key parameters, such as RO pressure, ED voltage, and ED volume ratio, were systematically evaluated and the operation conditions of the processes were optimized. Under an operating pressure of 5 MPa, RO can enrich low-concentration HAc from 1.5 wt.% to 6.5% wt.% and the energy consumption is 0.37 kW·h·kg−1. Next, RO-concentrated water was used as the ED feed and the first ED with a volume ratio of the concentrated to dilute chamber of 1:4 was carried out under the conditions of a flow rate of 30 L/h and an operating voltage of 12 V; the HAc concentration reached 12.50 wt.%. The second ED with a volume ratio of 1:5 made the final HAc concentration reach 19.02 wt.%. This study shows that using RO-concentrated water instead of initial water for the ED process can reduce water energy consumption and cost markedly, and the RO–ED integrated process can efficiently pre-enrich low-concentration HAc aqueous solution, and the enriched HAc concentration meets the requirements for the further distillation of HAc.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Membranes
·
2020
·Vol. 10
·期 7
·142
·
IF 3.094
Qian Liu,Lixin Xie,Hanxiao Du,Shichang Xu,Yawei Du
In the production of acrylic acid, the concentration of acrylic acid solution from the adsorption tower was low, which would lead to significant energy consumption in the distillation process to purify acrylic acid, along with the production of a large amount of wastewater. Reverse osmosis (RO) was proposed to concentrate the acrylic acid aqueous solution taken from a specific tray in the absorption tower. The effects of operating conditions on the permeate flux and acid retention were studied with two commercial RO membranes (SWC5 and SWC6). When the operating pressure was 4 MPa and the temperature was 25 °C, the permeate fluxes of two membranes were about 20 L·m−2·h−1. The acrylic acid and acetic acid retentions were about 80% and 78%, respectively. After being immersed in the acid solutions for several months, the characteristics of the two membranes were tested to evaluate their acid resistance. After six months of exposure to the acid solution containing 2.5% acrylic acid and 2.5% acetic acid, the retentions of acrylic acid and acetic acid were decreased by 5.7% and 4.1% for SWC5 and 4.9% and 2.2% for SWC6, respectively. The changes of membrane surface morphology and chemical composition showed the hydrolysis of some amide bonds.Keywords:reverse osmosis (RO);concentration;acrylic acid;acetic acid;membrane stability
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2023
·
IF 13.2
Zhigao Zhu,Xiangyang Xue,Minjie Song,Junwen Qi,Yujun Zhou,Yue Yang,Jiansheng Li
Membrane distillation (MD) is a critical technique for achieving near-zero discharge of hypersaline wastewater. However, it often faces challenges due to frequent mineral scale accumulation on the membrane surface and within its pores, particularly during the later stages of concentration, which compromises the membrane's lifespan and sustainability. This study explores the effects of implementing scaling control using micro–nano structured superhydrophobic nanofibrous membranes for concentrating reverse osmosis seawater concentrate and simultaneously aims to identify the membrane concentrating critical point (MCCP), a vital threshold that precedes irreversible scaling, to enhance sustainable desalination . Our findings show that the micro-nanostructures on the superhydrophobic membrane surface significantly reduce salt nucleation on the membrane surface and within the membrane pores, effectively extended the membrane MCCP for stable membrane flux, water recovery and reusability. Moreover, the membrane service life can be substantially extended by halting the concentration process before salt crystals embed into the membrane pores. This research highlights the critical role of these two control factors in augmenting membrane service life, offering valuable theoretical and practical insights for MD applications in hypersaline wastewater treatment.
研究领域:
环境工程
·
水处理
·
海水淡化技术
·
膜科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Ya Dan Li,Hui Hui Chai,Shu Jie Zhang,Zhi Song Lu,Chang Ming Li,Ling Yu
A sensitive and portable on-thread pre-concentration and colorimetric detection method of copper ions was proposed. Commercial cotton thread was proposed as a solid sorbent for effectively extracting copper ions (Cu 2+ ) from solution. The adsorbed Cu 2+ was converted to Cu + by ascorbic acid . The Cu + on the threads was visualized by horseradish-peroxidase-catalyzed color changes of a chromogenic oxidized tetramethylbenzidine substrate. The adsorption of Cu 2+ on the plasma- and Na 2 CO 3 -treated thread was verified by scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and zeta potential characterization. The Cu + -induced dysfunction of HRP on the thread was verified by X-ray photoelectron spectroscopy. With optimized reaction conditions, the concentration-dependent colorimetric response plot was characterized, where the linear detection range was 2–400 nM and the detection limit was about 0.15 nM. Measurements of a group of possible interfering ions and spiked real-water samples demonstrated the good selectivity of the proposed method. The proposed on-thread pre-concentration and colorimetric detection offers a low-cost and effective alternative for detecting of copper ions in real applications.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2023
·Vol. 12
·期 4
·786
·
IF 5.2
Shuaishuai Duan,Fengjuan Liu,Qiaomei Qin,Qinlan Jia,Xiaoqian Cao,Zhenyu Hua,Yingying Fan,Cheng Wang
Patulin (PAT) is a toxic secondary metabolite produced byAspergillussp. andPenicilliumsp., which acts as a contaminant of most apples and their products. The internationally recognized HACCP system is selected as the theoretical basis to more effectively reduce the PAT in apple juice concentrate (AJC). Through field investigation of apple juice concentrate (AJC) production enterprises, we collected 117 samples from 13 steps of AJC production, including whole apple, apple pulp, and apple juice. PAT contents were analyzed via high-performance liquid chromatography (HPLC) and compared with samples from the different production processes. The result demonstrated that the PAT content was significantly (p< 0.05) influenced by five processes, receipt of raw apples, sorting of raw apples, adsorption step, pasteurization, and aseptic filling. These processes were determined as the CCPs. Monitoring systems for maintaining CCPs within acceptable limits were established, and corrective actions were proposed in case a CCP was surpassed. Based on the above-identified CCPs, critical limits, and control methods (corrective actions), a HACCP plan related to the production process of AJC was established. This study provided important guidance for juice manufacturers wishing to effectively control the PAT content in their products.Keywords:apple juice concentrate;HACCP;patulin;critical control points
研究领域:
食品科学
·
食品安全
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yun-Peng An,Chang Liu,Jing Yang,Bian-Bian Guo,Zhi-Kang Xu
Ionic liquids (ILs) show a wide range of applications as “green” solvents in the new era and the recovery of water-soluble ILs has become an urgent issue. Herein, for the first time, osmotic distillation is applied to concentrate and recover water-soluble ILs with a series of hydrophobic membranes. Poly(vinylidene fluoride) membrane with vertically oriented pores and stainless steel mesh were hydrophobically modified and then compared with commercial membranes to demonstrate the influence of different pore structures on the osmotic distillation concentration process . With the vapor pressure difference between two sides of the membrane being the driving force, the dilute aqueous solutions of ILs can be concentrated to about 84 wt % after 24 h with a water flux of 7.8 kg m −2 h −1 . It is also able to achieve ultra-high rejections to ILs and MgCl 2 (>99.99%) by this osmotic distillation process. Although there exists a limitation for dewatering the ILs solutions with very high concentrations and thus the final ILs purity cannot reach 100%, this method is promising for practical applications benefiting from its high rejection to ions, easy operability at ambient temperature and remarkable universality in terms of hydrophobic membranes used.
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
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Miaolu He,Leihao Feng,Jin Wang,Yunlong Gao,Weiting Zhang,Lujie Nie,Jiajin Hao,Jiaqi Wang,Rui Miao,Lei Wang
Recently, low-energy forward osmosis (FO) technology has been employed in the lithium concentration stage during the extraction of lithium from brine sources. The interlayer FO membrane is renowned for its exceptional structural characteristics; however, challenges remain in selecting suitable interlayer materials and exploring their control mechanisms on amine monomers. As interlayer materials, traditional 3D nanomaterials are prone to detachment, while traditional 2D materials without micropores can increase the transmission resistance of water molecules. This study introduces a novel FO membrane utilizing Zr-BTB nanosheets with 5.4 Å micropores as the interlayer material. Based on detection and simulation calculations, it was found that the increase in steric hindrance and interaction forces jointly slowed the diffusion of amine monomers in the presence of the Zr-BTB interlayer. This results in a thinner separation layer, facilitating water transport. The interlayer also plays crucial roles in preventing defective pore formation in the separation layer and assisting in intercepting salt ions. The Zr-BTB interlayer membrane exhibited a water flux of 29.14 L m −2 h −1 and a reverse salt flux of 0.16 g m −2 h −1 , which are superior to those of many FO membranes reported in the field. The prepared membrane also has excellent performance in lithium concentration applications, and its separation mechanism was explored by MD simulations.
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
DESALINATION
·
2024
·
IF 8.3
Zhenzhen Cui,Baoying Wang,Ruirui Li,Zihao Wang,Weicheng Fu,Junying Yan,Liang Wu,Yaoming Wang,Tongwen Xu
Rapid and highly effective enrichment of nuclides containing liquid effluent is crucial for online monitoring of radioactive trace elements from nuclear power plants (NPPs). In this study, auxiliary electrodialysis (AED) was proposed for high enrichment of trace ions in the liquid effluents of NPPs. The effects of the auxiliary ion type and concentration and the operating voltage on the AED concentration performance were investigated. When the volume ratio of the solution was 140: 1 with 0.03 mol/L HNO 3 as the auxiliary electrolyte, most of the nuclide ions were concentrated more than 50 times after the two-stage electrodialysis experiment. In the first-stage electrodialysis, the concentration of most ions, with the exception of the higher valence ions (Ru 3+ and Zr 4+ ), tends to increase with increasing operating voltage. The diluate stream volume could be minimized to 98.8% with a total energy consumption of 9.5 kWh/m 3 . By considering the impact of boron in the liquid effluents, more than 52 times concentrations could still be achieved by extending the running time of the first-stage ED (increasing the ion removal rate). The transmembrane fluxes of various cations decreased in the order of Cs + > Sr 2+ > Zn 2+ > Co 2+ ≈ Ni 2+ ≈ Mn 2+ > Fe 3+ > Cr 3+ > Ru 3+ > Zr 4+ , which is attributed to the experimental operating parameters and ionic properties. This research provided a viable technique for rapid and highly effective enrichment of nuclides containing liquid effluents for both radioactive element monitoring and wastewater volume reduction.
研究领域:
环境科学
·
核技术应用
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Chu Chu,Linmin Lian,Wei Gao,Yaping Zang,Yanfang Zou,Yangbin Lv,Chenyue Li,Shengqiang Tong,Jizhong Yan,Suhong Chen
An efficient off-line and on-line synergistic preconcentration strategy which involves combining micro matrix solid-phase dispersion (MSPD) with electrokinetic supercharging (EKS) in capillary zone electrophoresis (CZE) has been developed for the determination of two alkaloids, lycorine and galanthamine, in complicated matrix samples. This method was comprehensively optimized in terms of the buffer condition, the leading electrolyte (LE), terminating electrolyte (TE), the sample injection in EKS preconcentration, as well as the dispersing sorbent, the sample/dispersing sorbent mass ratio, grinding time, eluting solvent in MSPD procedure. Under the optimum conditions, lycorine and galanthamine, achieved about 1500- and 1200-fold sensitivity improvement respectively when compared to the ordinary injection. A satisfactory correlation coefficient (R 2 > 0.9982) was obtained in the range of 10–500 ng/mL. The limits of detection (LODs) for lycorine and galanthamine were 6.0 ng/mL and 8.0 ng/mL, respectively. Moreover, the proposed method was successfully applied in two real samples, rat fecal samples and Bulbus Lycoridis Radiatae, to demonstrate its feasibility. Recoveries in spiked fecal and plant samples were 89.51% to 107.4%. The result showed that the new developed method possessed the great potential in analyzing trace alkaloids in complicated samples matrix.
研究领域:
分析化学
·
药理学
✓ 已验证
DOI
高影响因子
Energies
·
2013
·Vol. 6
·期 7
·3466-3480
·
IF 1.844
Haibo Tan,Shengping Wang,Du Tao,Zhigao Yang
A novel technique to prepare carbon/sulfur composites as cathode materials for Li/S batteries is proposed, which we call the ‘solution evaporation concentration crystallization’ method. Three composites with different S loadings were prepared, subject to two different solvent evaporation rates from acetylene black (AB)/sulfur in carbon disulfide solutions. X-ray diffraction, environmental scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller measurements all show that the porous AB structure is well-filled with S. Composites prepared at a lower solvent evaporation rate with 50 wt % S content, had good electrochemical properties, with 1609.67 mAh g−1in the initial cycle and 1115.69 mAh g−1after 100 cycles. Composites with better dispersibility at a low solvent evaporation rate can effectively prevent polysulfide from dissolving in the electrolyte, and serve to stabilize the structure of the S cathode during the charge-discharge process.Keywords:sulfur/carbon composites;solution evaporation concentration crystallization method;lithium sulfur batteries
研究领域:
材料科学
·
电化学
✓ 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）