SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiao-lei Wang,Wei Qin,Li-xin Wang,Kong-yin Zhao,Hui-cai Wang,Hong-yu Liu,Jun-fu Wei
In order to recover dyes from textile wastewater, a self-supported carboxylated titanium dioxide/calcium alginate (TiO 2 -COOH/CaAlg) hydrogel nanofiltration membrane was prepared using TiO 2 -COOH as the reinforcing agent. The Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDX) mapping scanning spectra were employed to characterize the distribution of TiO 2 -COOH nanoparticles on the membrane surface. The pore size distribution, zeta potential and mechanical performance of the membrane were evaluated. The rejections for single dye solutions, salt solutions and dye/salt mixture solutions were also examined. The results indicate that the TiO 2 -COOH nanoparticles are dispersed uniformly on the membrane surface. Compared to CaAlg membrane, the tensile strength of 20 wt% TiO 2 -COOH/CaAlg membrane is enhanced by 328%. At the operating pressure of 0.1 MPa, the rejection ratios of 20 wt% TiO 2 -COOH/CaAlg membrane for 100 mg/L Brilliant blue G250, Direct black 38 and Congo red are 98.4%, 96.8% and 95.9% respectively, and the permeate flux is about 14.1 L·m −2 ·h −1 . Meanwhile, this membrane possesses the low rejection ratios for inorganic salts (16.1%, 15.6%, 12.3% and 9.0% for MgSO 4 , Na 2 SO 4 , MgCl 2 and NaCl, respectively), excellent dye anti-fouling property and good stability in the long-term filtration for dye/salt mixture solution.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Yuhan Wang,Yirong Tao,Qian Chen,Zhiqin Dong,Qiang Xiong,Xinfu Li
This study aimed to evaluate the effects of pulsed electric field (PEF) pretreatment on the NaCl content, protein composition, and microstructure of pork during the marination process. The results showed that needle PEF could promote salt penetration into the center of pork pieces. Under optimal PEF conditions (3.0 kV/cm, 200 Hz, and 2400 pulses), the marination time could be reduced by almost 12 h. Protein characterization also revealed that PEF pretreatment changes myofibrillar protein properties by promoting salt penetration toward the center of pork. Furthermore, microstructural analysis demonstrated that the enhanced marination effect could be attributed to the PEF treatment-induced expansion of gaps between muscle bundles. Industrial relevance In this study, a PEF-assisted curing technique significantly (P < 0.05) improved salt penetration into the center of pork. Reducing the differences between internal and external salt concentrations can produce a more homogeneous marinade and reduce the marination time. Our findings suggest that PEF pretreatment is a promising and effective pretreatment technique for curing meat products.
研究领域:
食品科学
·
肉类加工
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Hao Yu,Yi He,Hongjie Li,Zhong Li,Baiyu Ren,Guanyu Chen,Xinyi Hu,Tao Tang,Yinfen Cheng,Jian Zhen Ou
Graphene oxide membranes (GOMs) have great potentials in the high-performance desalination of salty wastewater. However, the low-selectivity and fouling issues are the main obstacles to practical implementation. Although compositing with TiO 2 nanoparticles alleviates such problems by regulating membrane structures and photodegrading surface organic filter cakes, the performance is still limited by the intrinsic aggregation feature and narrow UV response range. Here, we functionalize TiO 2 nanoparticles with polypyrrole (PPy) to improve their dispersibility and visible-light-driven photodegradation properties. The as-formed core-shell heterostructures (PPy@TiO 2 ) with a large dose are intercalated into GOM, resulting in a large water flux (436.93 Lm −2 h −1 bar −1 ) and selective positive dye/negative dye separation with a maximum salt permeation of 97%. Upon the reduction of the dosage, more than 99% of dyes are separated regardless of molecule weights and surface charge polarity although the average water flux is reduced to 5.83 Lm −2 h −1 bar −1 and the salt rejection rate is increased up to 24%. In addition, the composite membrane with low-dosed PPy@TiO 2 photodegrades MB completely within 2 h, while its water permeability and dye rejection performance are maintained after a 5 h filtration process . Our work provides a facile method to develop multi-functional 2D composite membranes with controllable and stable dye desalination performances.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2024
·Vol. 35
·期 4
·045109
·
IF 2.7
Xiaoming Wang,Zhilong Guo,Yifeng Huang,Longbo Xiong,Daojin Yao,Wentao Dong
Strong winds can make a bridge's cable-stayed cables produce violent vibrations, leading to fatigue of the cable-stayed cables and damaging the cable-stayed bridge's structure. Accurately and effectively obtaining data on the wind loads applied to the cable-stayed cables is important for assessing the cable-stayed cables' health. The existing sensing elements for detection include diffusion silicon piezoresistive sensor, strain gauge, and other rigid sensors. However, most of them present such disadvantages as rigidity, difficult to fit the curved surface, high cost and low sensitivity. And it cannot be directly installed on the surface of the cable. In this paper, a conductive hydrogel flexible pressure sensor based on TA/CB@PDMS was developed, using carbon black (CB) as the main conductive medium, with good electrical conductivity, high sensitivity (0.65 kPa−1) and excellent tensile properties (210% tensile breakage). Meanwhile, a salt permeation method (Soak the sensor in LiBr solution) was used to effectively inhibit the sensor's water from being evaporated and frozen. Its substrate incorporates tannic acid to increase the sensor's adhesion so that it adheres well to the diagonal cable's surface. In this paper, the wind speed variation around the diagonal cable and the force distribution on the surface with considering the fluid-structure coupling effect are analyzed by ANSYS WORKBECH finite element simulation. Wind tunnel experiments simulate the sensor's force response when the inclined cable is subjected to different wind speeds, and the detection accuracy reaches 96.17%. The results show the sensor developed in this paper can realize accurate wind pressure detection of the inclined cable. This study provides a new method for wind pressure detection and health inspection of diagonal cables.
研究领域:
土木工程
·
材料科学
·
传感技术
·
结构健康监测
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Yuling Ren,Pengfei Qi,Yinhua Wan,Chulong Chen,Xiangrong Chen,Shichao Feng,Jianquan Luo
A nanofiltration (NF) membrane with high salt permeation and high retention of small organics is appealing for the treatment of high-salinity organic wastewater. However, the conventional negatively charged NF membranes commonly show high retention of divalent anions (e.g., SO42–), and the reported positively charged NF membranes normally suffer super low selectivity for small organics/Na2SO4 and high fouling potential. In this work, we propose a novel “etching–swelling–planting” strategy assisted by interfacial polymerization and mussel-inspired catecholamine chemistry to prepare a mix-charged NF membrane. By X-ray photoelectron spectroscopy depth profiling and pore size distribution analysis, it was found that such a strategy could not only deepen the positive charge distribution but also narrow the pore size. Molecular dynamics confirm that the planted polyethyleneimine chains play an important role to relay SO42– ions to facilitate their transport across the membrane, thus reversing the retention of Na2SO4 and glucose (43 vs 71%). Meanwhile, due to the high surface hydrophilicity and smoothness as well as the preservation of abundant negatively charged groups (−OH and −COOH) inside the separation layer, the obtained membrane exhibited excellent antifouling performance, even for the coking wastewater. This study advances the importance of vertical charge distribution of NF membranes in separation selectivity and antifouling performance.
研究领域:
膜科学
·
水处理
·
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Yuling Ren,Pengfei Qi,Yujie Han,Yinhua Wan,Jiuyang Lin,Ming Xie,Xiangrong Chen,Shichao Feng,Jianquan Luo
The efficient removal of organic contaminants from high-salinity wastewater is crucial for resource recovery and achieving zero discharge. Nanofiltration (NF) membranes are effective in separating organic compounds and monovalent salts, but they typically exhibit an excessive rejection of divalent salts. Modifying the charge characteristics of NF membranes can improve salt permeation; however, the role of charge spatial distribution in governing salt transport behavior is not fully understood. In this study, we developed a mix-charged NF membrane with a horizontal charge distribution by employing interfacial polymerization combined with a polyester template etching and solvent-induced polyamine intercalation strategy. The ratio of positive to negative charge domains in the membrane can be precisely controlled by adjusting the aqueous monomer ratio and polyamine modifier type. X-ray photoelectron spectroscopy (XPS) depth profiling and separation layer thickness analysis confirmed the complete penetration of polyamines into the separation layer, providing direct evidence of the formation of horizontally distributed charge domains. This unique charge distribution results in a high charge density and a near-electroneutral surface, which facilitates the permeation of the divalent salts. The size-dependent “plug-in” modification and covalent cross-linking further reduce pore size, enhancing rejection of small organic molecules. Additionally, the membrane demonstrated exceptional antifouling performance against both negatively and positively charged pollutants, attributed to its unique charge distribution and smooth surface. Molecular dynamics (MD) simulations further revealed that weak electrostatic interactions and a tightly bound hydration layer contribute to the membrane’s superior antifouling properties. This work provides valuable insights into the design of NF membranes with tailored microstructures and charge distributions for improved water treatment performance.
研究领域:
环境工程
·
水处理
·
膜技术
·
材料科学
✓ 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）