CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiguang Huang,Haiping Chen,Tian Zhou,Run Qi,Heng Zhang
Coal fly ash (CFA) is a promising substitute material in ceramic membrane fabrication to address the high membrane cost issue. However, supports prepared with CFA usually have wide pore size distributions , leading to difficulties in fabricating separation layers. This study focused on overcoming the selectivity-permeability trade-off of membranes based on the CFA support. Five different sizes of alumina powders were adopted to optimize the particle size for separation layer preparation. The membrane prepared using the powder with mean particle size of 1.11 μm under 1150 °C sintering had the best comprehensive performance. The mean pore size was 161 nm and the permeability was 879.71 L/(m 2 ∙h∙bar). Membranes with smaller coating particles had defects because of the particle penetration while membranes with larger particles showed little pore size difference with the support. This work offers opportunities to broaden the application of low-cost CFA membranes.
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
RSC Advances
·
2017
·Vol. 7
·期 89
·56183-56193
·
IF 3.108
Yong Zhang,Bin Yang,Kuiling Li,Deyin Hou,Changwei Zhao,Jun Wang
A novel terpolymer (abbreviated as THV), which is a copolymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride, that possesses advantages of excellent hydrophobicity, mechanical properties, and chemical resistance is an ideal material for membrane distillation. In this study, THV hydrophobic membranes were fabricated by the electrospinning method. Morphology and properties (pore size distribution, liquid entry pressure, porosity, and contact angle) of the THV electrospun membranes with various fabrication conditions (solvent composition, THV concentration, and applied voltage) were systematically studied. Under the optimized condition, the membrane exhibited a good structure, wetting resistance, and surface hydrophobicity. The mean pore size, liquid entry pressure of water (LEPw), and contact angle were 0.79 μm, 118.0 kPa, and 130.7°, respectively. Owing to the advantages of the raw material and fabrication method, the membrane showed excellent mechanical properties and desalination performance. The tensile strength was 5.41 MPa, and the elongation at break was 247.9%, which were 2.47 and 5.61 times higher than those of the poly(vinylidene fluoride) (PVDF) membrane, respectively. Additionally, the membrane distillation flux was 4.42 kg m−2 h−1, which was 1.93 times higher than that of the PVDF counterpart obtained under the same test condition via sweeping gas membrane distillation, and the salt rejection rate was higher than 99.8%.
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
ENERGY
·
2025
·
IF 9.4
Tian Zhou,Kaili Xue,Heng Zhang,Haiping Chen,Zhaohao Li
Ceramic membrane has been widely used in many fields. The pore size has an important effect on the separation effect of the membrane. Particle sintering is a mature method for preparing ceramic microfiltration membranes and has the advantages of convenient operation and strong controllability. In this study, the composite ceramic membranes with different pore size distributions were prepared. During the experiment, the influence of preparation conditions on the membrane was investigated, and the influence of inner coating and outer coating on the modification of the pore size was analyzed from the theoretical level. The carbon capture performance of the composite ceramic membrane was also tested. The experimental results show that the content of ZrO 2 has an effect on the structure of the film. When the solid content of the coating liquid is higher than 5 wt% and less than 20 wt%, and the sintering temperature is higher than 900 °C and less than 1300 °C, the formed film is complete without defects. Compared with the outer coating, the inner coating of the composite ceramic membrane has better applicability. In the carbon capture test, the CO 2 absorption efficiency can reach more than 90 %.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fan Ye,He Yang,Chuhang Hong,Xiaopei Wu,Honglian Dai
In bone repair, scaffold structural design is essential for optimizing mechanical performance and osteogenic potential. Gradient structural scaffolds are engineered to balance mechanical qualities and permeability which can improve the material transport capacity of scaffolds. This study designed and fabricated gradient structural scaffolds with spatially distributed pore size, and investigated their mechanical and fluid dynamics properties, coupled with in vitro osteogenic experiments to understand the impact of pore size distribution. The results indicated that, compared to traditional uniform pore scaffolds, gradient scaffolds exhibited a significant increase in mechanical strength, fluid permeability, and in vitro osteogenic activity. To sum up, the gradient scaffolds demonstrated better comprehensive performance and potential for use in the structural design of bone repair scaffolds, offering an important reference value for the three-dimensional structural design of scaffolds.
研究领域:
生物医学工程
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF STORED PRODUCTS RESEARCH
·
2023
·
IF 2.7
Xinfeng Cheng,Pan Ling,Muhammad Shahid Iqbal,Fangfang Liu,Jingyan Xu,Xiaoran Wang
Moisture adsorption isotherms and thermodynamic properties of dried Chlorella pyrenoidesa and Spirulina platensis powders were investigated by using a static gravimetric at temperatures of 20, 30, and 40 °C and within a w range of 0.112–0.976. Structural characteristics involving morphology, functional group, surface element composition, pore size distribution, and surface area were analyzed to explore the water adsorption mechanism. FTIR and XPS analysis indicated that spirulina powder had a higher proportion of hydrophilic sites to bind water molecules in comparison with chlorella powder. BET surface area for chlorella and spirulina powders were 25.10 and 25.19 m 2 /g, respectively. Water adsorption data were adjusted using a variety of sorption models, and the GAB equation was the most appropriate for representing the experimental data in the studied a w and temperature range. The monolayer moisture content ( X m ) values at 20, 30 and 40 °C were 0.0526, 0.0483, and 0.0456 g/g dry basis for chlorella powders , and 0.0581, 0.0553, and 0.0420 g/g dry basis for spirulina powders, respectively. The net isosteric heat ( Q st ) and differential entropy (δ S dif ) for both microalgae powders decreased with an increase in water content. Using the compensation theory, we determined that the processes were governed by the enthalpy and that they were non-spontaneous (δ G >0) for the samples. Both microalgae powers were classified as micro and mesoporous materials, and the pore radius ( R p ) varied from 1.481 to 23.694 nm for chlorella powders and from 1.193 to 39.392 nm for spirulina powders, respectively.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Lina Ma,Daikun Li,Xing Chen,Hua Xu,Yu Tian
In this work, a sustainable 3D carbon aerogel (AO-WPC) is prepared from waste paper (WP), and used for efficient antibiotics removal from water. The AO-WPC aerogel shows good mechanical property and can recover after 100th of 30 % compression strain. The specific surface area of AO-WPC aerogel is up to 654.58 m 2 /g. More importantly, this aerogel reveals proper pore size distribution , including micro sized macropores between carbon fibers and intrinsic nano scale mesopores (11.86 nm), which is conducive to remove antibiotics from water. Taking tetracycline (Tc) as an example, the maximum adsorption capacity and adsorption rate of AO-WPC for Tc are as high as 384.6 mg/g and 0.510 g/(mg‧min), respectively, which exhibits significant advantages over most of the recent absorbents, and the adsorption toward Tc reveals good resistance to various environmental factors, including pH, various ions, and dissolved organic matter (DOM). Moreover, good thermal stability enables the AO-WPC aerogel to be regenerated through simple burning, and the adsorption capacity of Tc only decreases by 10.4 % after 10 cycles. Mechanism research shows that hydrogen bonding and π-π electron-donor-acceptor (EDA) interaction play the important role in the adsorption. The excellent mechanical property and adsorption performance imply good practical prospect of the AO-WPC aerogel.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yong Liu,Xudong Liu,Shangli Dong,Xuefeng Zhang,Yidan Wei,Lu Lv,Sirui He
The closely restacked MXene nanosheets obstruct electrolyte ion transfer in electrodes, limmiting the electrochemical performance at a high charging-discharging rate. Although various 3D porous structures have been constructed, size effect of porous MXenes electrodes has been rarely studied. Herein, the classical metal ion-assisted method was used to fabricate 3D porous MXene films. The pore size distribution was changed by adjusting the cation valency. Noteworthy, when the mesoporous pore size distribution is in the range of 5 ∼ 10 nm, the porous structure can significantly improve the electrochemical performance and the presence of micropores can increase the proportion of surface capacitance. As a result, the porous Ti 3 C 2 T x film treated by Mg 2+ showed outstanding electrochemical performance, with both high capacity (420F/g at 2 mV/s) and good cyclic stability (94.4% retention after 5000 cycles). This work presents a study on how pore size distribution of porous MXene film effects the electrochemical performance and provides a reference for the design of 3D porous MXene electrodes.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Weida Shi,Zhihao Jin,Juanjuan Wen,Xianfu Chen,Kaiyun Fu,Xiaowei Da,Minghui Qiu,Yiqun Fan
The development of tight ceramic ultrafiltration membranes for water purification facilitates is challenging because of high fabrication costs and low permeate flux . In this study, a low-energy rapid thermal process (RTP) was comprehensively investigated for fabricating of high-precision, permeable α-alumina tight ultrafiltration membranes. Compared to the conventional thermal process (CTP), RTP offers an ultra-fast heating rate and shorter holding time, effectively mitigating grain growth and pore aggregation. Moreover, the decomposition of organic matter is delayed during RTP, providing a lower interfacial energy that enables direct formation of α-alumina at a low temperature of 750 °C. During a secondary subsequent RTP, the residual phase is fully converted to α-alumina by the in-situ seeding effect. By utilizing RTP, we successfully prepared α-alumina ultrafiltration membranes within 30 min by calcination , with an average pore size of approximately 6 nm, a narrow pore distribution coefficient of 1.12, and high permeance of 219 L −1 ·m −2 ·h −1 ·bar −1 .
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2017
·
IF 1.174
Kailiang Zeng,Jie Zhou,Zhaoliang Cui,Yue Zhou,Chuan Shi,Xiaozu Wang,Liyue Zhou,Xiaobin Ding,Zhaohui Wang,Enrico Drioli
Membrane fouling is the key problem that occurs in membrane process for water treatment. However, how membrane microstructure influences the fouling behavior is still not clear. In this study, fouling behavior caused by dextran was deeply and systematically investigated by employing four poly(vinylidene fluoride) (PVDF) membranes with different pore sizes, ranging from 24 to 94 nm. The extent of fouling by dextran was accurately characterized by pore reduction, flux decline, and the change of critical flux. The result shows that membrane with the smallest pore size of 24 nm experienced the smallest fouling rate and the lowest fouling extent. As the membrane pore size increased, the critical flux ranges were 105–114, 63–73, 38–44 and 34–43 L·m − 2 ·h − 1 , respectively. The critical flux and fouling resistances indicated that the fouling propensity increases with the increase of membrane pore size. Two pilot membrane modules with mean pore size of 25 nm and 60 nm were applied in membrane filtration of surface water treatment. The results showed that serious irreversible membrane fouling occurred on the membrane with pore size of 60 nm at the permeate flux of 40.5 L·m − 2 ·h − 1 . On the other hand, membrane with pore size of 25 nm exhibited much better anti-fouling performance when permeate flux was set to 40.5, 48 and 60 L·m − 2 ·h − 1 .
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
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Fan-xin Kong,Lian You,Jia-mei Cao,Qian Liu,Ping Xia,Jin-fu Chen
Holey graphene oxide (HGO) and reduced HGO membranes (rHGO) can overcome high tortuosity and poor stability of GO-based membranes, respectively. In this study, HGO and rHGO membranes were fabricated to try to quantitatively elucidate the etching and reduction time on structure, stability and rejection performance for slat and pharmaceuticals. Water flux of HGO membrane linearly increased ( J v =2.07 t + 1.02, R 2 =0.9931) and Na 2 SO 4 rejection linearly decreased ( R Na2SO4 =−4.37 t + 88.26, R 2 =0.9511), while the membranes stability substantially increased with etching time from 1 to 5 h (water flux variation from 22% to 5% and rejection ratio variation from 17% to 7%) under long-term vibration . Subsequently, water flux of rHGO membranes exponentially decreased ( J v = exp (2.89–0.12 t + 0.0039 t 2 ), R 2 = 0.9996) with reduction time, while slightly improved salt rejection ( R Na2SO4 = exp (2.89–0.12 t + 0.0039 t 2 ), R 2 = 0.9971) were observed. Effective length of actual pathways for GO, HGO 4 and rHGO 4–5 membranes calculated by the mass transfer-based model was 7.37 ± 0.47, 4.48 ± 0.68 and 7.23 ± 1.29 µm, respectively, which were much higher than that geometric thickness of the GO membranes. These results indicated that d -spacing, tortuosity and porosity should be comprehensively considered for membrane design and fabrication. With a series of saccharides as probes, average pore size slightly decreased for HGO 4 ( r p =0.36 nm, S p =0.34) and rHGO 4–5 ( r p =0.33 nm, S p =0.28) membrane compared with GO membranes ( r p =0.38 nm, S p =0.3), demonstrating that etching and following reduction marginally affected the pore size distribution. H 2 O 2 etching increased both water permeability ( A) and its selectivity ( A/B ) for three pharmaceuticals, while the thermal reduction substantially decreased the water flux. Moderate and low rejection ratios for the three pharmaceuticals also demonstrated the importance of trade-off between etching and reduction time and the urgent need for narrowing pore-size distribution for GO-based membranes for water purification .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Yifan Wang,Weisen Yang,Chunmei Zhang,Xiaoshuai Han,Jingquan Han,Shuijian He,Jiapeng Hu,Shaohua Jiang
Herein, balsa wood, poplar wood, and birch wood were selected to systematically study precursors on the structure and Li-storage properties of wood-based hard carbon thick electrodes (WHCTEs). After carbonization, the densities of balsa, poplar, and birch carbon (Bal-W, Pop-W, and Bir-W) reach 99.29, 279.13, and 608.14 mg cm⁻ 3 , respectively. The specific surface areas of Bal-W, Pop-W, and Bir-W are 798, 729, and 609 m 2 g⁻ 1 , respectively. Bal-W is rich in mesopores at 2–4 nm; Pop-W also has a certain amount of mesopores; while Bir-W has almost no mesopores but large numbers of micropores concentrated at 1.2 and 1.6 nm. In the battery test, due to the highest mass loading, Bir-W retained the largest remaining capacity among the three samples after 200 cycles at 1 mA cm⁻ 2 . The remaining capacities of Bal-W, Pop-W, and Bir-W are 12.27, 34.15, and 41.03 Ah L⁻ 1 , respectively. It is found that mass loading, specific surface area, and pore size distribution have a greater influence on the electrode capacity performance. In addition, the kinetic features of the Li-ion storage of WHCTEs were studied. This work may provide an important reference for the field of WHCTEs for alkali metal ion batteries and can promote its practical application.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xianjie Wang,Jingdong Gou,Louwei Cui,Jinhui He,Xue Ma,Yaning Zhao,Liuyi Pan,Huiyong Chen,Zhe Jin,Hongyan Wang,Yonghong Zhu,Dong Li
The separation of ethylcyclohexane (ECH) from coal-based C8 naphthenic oil mixtures poses significant industrial challenges due to their similar physicochemical properties. Herein, we investigate the separation performance of carbon molecular sieves with varying pore sizes and oxygen content through dynamic breakthrough experiments and pulse testing with real industrial feedstocks. The results demonstrate that CMS-100 exhibits superior separation efficiency for ECH with an adsorption selectivity of 1.9 (ECH/ trans -1, 2-dimethylcyclohexane) as well as ECH uptake of 49 mg/g, achieving a separation factor of 0.48, attributed to its optimal microporous structure (0.64–0.86 nm). In contrast, CMS-75, characterized by a larger mesopore volume (2–20 nm), facilitates faster desorption rates, aiding in molecular transport. Grand canonical Monte Carlo (GCMC) simulations confirm that variations in substituent arrangement influence the diffusion rates of C8 cycloalkanes within the pore channels, while oxygen-containing functional groups enhance the interaction energies between C8 cycloalkanes and the adsorbent, particularly for ECH, whose larger ethyl group and electronic effects result in stronger adsorption affinity compared to DCH isomers. However, the presence of oxygen functionalities negatively impacts overall adsorption capacity by introducing steric hindrance. These findings underscore the importance of precisely optimizing both pore size distribution and surface chemistry for efficient hydrocarbon separation. This work provides a solid foundation for developing next-generation adsorbents aimed at industrial-scale separation of naphthenic oils.
研究领域:
化学工程
·
材料科学
✓ 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）