CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 97
·期 3
·709-716
·
IF 1.265
Wei Wang,Dapeng Hu,Yanqiu Pan,Hengle Li,Guohua Chen
Initially unsaturated material frozen with prefabricated porosity was prepared to experimentally investigate its effect on freeze-drying of liquid material. Ceftriaxone sodium, a kind of commonly used antibiotic, was selected as the primary solute in an aqueous solution. The liquid nitrogen ice cream-making method was employed to prepare frozen materials with different initial porosities. Results showed that freeze-drying was significantly enhanced with the initially unsaturated frozen material and substantial drying time was saved compared with conventional freeze-drying. Drying time for the unsaturated sample (0.3 of saturation or 0.67 of initial porosity) was more than 20 % shorter than that required for the saturated one (1.0 of saturation without initial porosity). SEM images displayed that the dried products of the unsaturated frozen material had a pierced solid skeleton and uniform pore space with a fine and tenuous structure compared with those of the saturated one. The freezing rate exhibited little influence on the freeze-drying process. Annealing can be moderately beneficial to shortening the drying time and further improving the energy utilization. An appropriate increase in operating temperature was able to enhance the freeze-drying rate while changes in chamber pressure had a negligible effect on the process.
研究领域:
制药工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2013
·
IF 1.419
Xiaofeng Wu,Wenxiang Tang,Kejia Jiao,Yunfa Chen
Hollow ordered porous carbon spheres (HOPCS) with a hierarchical structure were prepared by templating with hollow ordered mesoporous silica spheres (HOMSS). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that HOPCS exhibited a spherical hollow morphology. High-resolution TEM, small angle X-ray diffraction (SAXRD) and N 2 sorption measurements confirmed that HOPCS inversely replicated the unconnected hexagonal-stacked pore structure of HOMSS, and possessed ordered porosity. HOPCS exhibited a higher storage capacity for Li + ion battery (LIB) of 527.6 mA h/g, and good cycling performance. A large capacity loss during the first discharge–charge cycle was found attributed to the high content of micropores. The cycling performance was derived from the hierarchical structure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xiumin Zhang,Wenjie Yang,Qingyi Wang,Fei Huang,Congjie Gao,Lixin Xue
Divalent metal nitrates were pre-loaded on polysulfone support to modulate the interfacial polymerization between piperazine (PIP) and trimesoyl chloride (TMC). It is found that the nano-porosity and nano-morphology of thus formed thin film composite polyamide (TFC-PA) nano-filtration (NF) membranes as well as their filtration performance could be effectively tuned by the type and concentration of the divalent metal salts, especially the divalent cations used. Main group cations, such as Mg (II) and Ca (II), increased the water flux of the NF membranes by increasing their surface nano-scale nodular arrays without altering the pore sizes and rejections of the membranes, while transitional metal cations such as Zn (II), Cu (II) and Co (II) increased the water flux of the NF membranes not only by the formation of high surface area nano-scale Turing type crisscrossed ridge networks, but also by the increase of their nano-pore sizes due to their coordination with the >NH groups of the PIP. The prepared NF membranes pore sizes adjustable from 0.54 Å to 0.90 Å could be developed to have varied selectivity and rejections among inorganic salts and organic dyes.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2015
·
IF 3.313
Yang Fan,Peifang Liu,Bing Zhu,Shufang Chen,Kaili Yao,Ran Han
The tree biomass acacia gum was used as a natural precursor to synthesize microporous carbon for energy storage application . The microporous carbons were synthesized by hydrothermal carbonization of acacia gum at 180 °C, and subsequent activation by KOH at temperatures in the range of 700−900 °C. The carbon materials possess high surface area and well-controlled pore size distribution . Moreover, the porosity can be finely tuned by modifying the activation temperatures. The influence of the porosity of the carbon materials on their capacitive performance was investigated. The superior charge storage capability with specific capacitance up to 272 F g −1 at current density of 1 A g −1 in 6 M KOH was achieved by the as-prepared microporous carbons.
研究领域:
材料科学
·
能量存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2025
·
IF 9.4
Xianwu Tan,Sheng Qiu,Ao Xia,Kai Lin,Yun Huang,Xianqing Zhu,Kaiyong Cai,Zidong Wei,Xun Zhu,Qiang Liao
To solve the energy crisis and environmental pollution caused by fossil fuels, the simultaneous pretreatment of wheat straw with laccase and ball-milling was proposed for the first time to achieve efficient conversion of lignocellulose, inspired by the digestive system of termites in nature. FTIR and XRD analysis showed that simultaneous pretreatment could degrade more lignin, reduce the crystallinity of cellulose, and increase the porosity by 26.3%∼80.1% compared with the control, which promoted the subsequent enzymatic hydrolysis. Under the optimal control parameters (ball milling speed of 500 rpm, ball milling time of 12 h, and slurry concentration of 5 wt%), the conversion ratios of cellulose and hemicellulose reached 99.2% and 75.3% in 72 h, representing a 2.5-fold and 4.1-fold increase compared to the control. The exergy efficiencies of pretreatment and enzymatic hydrolysis were 52.7% and 91.3%, respectively, and the overall exergy efficiency of simultaneous pretreatment was 56.6% with standardized exergy loss of 3.0 kJ/kJ monosaccharide. Overall, a new simultaneous pretreatment strategy was proposed in this study to improve the saccharification rate of wheat straw and systematically evaluated the energy efficiency of the process with exergy indexes.
研究领域:
生物能源
·
生物技术
·
化学工程
·
可再生能源
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xinglin Luo,Congwei Wang,Kun Zhang,Rongyu Li,Gang Li
The widely applicable gel polymer electrolytes (GPEs) hold significant promise for the commercialization of low-temperature flexible quasi-solid-state supercapacitors (FQSCs). However, their flexibility and electrochemical performance are compromised under extreme cold conditions, severely limiting their practical applications. Inspired by the novel effects of “pore-form agents (PFA)”in hydrogel-controlled drug release & delivery, polyvinyl alcohol (PVA) hydrogel electrolytes with optimized internal porosity (polymeric structure) were prepared by introducing PFA as pore-regulator and in-situ leaching process, hereby enhancing the hydrogel's electrical conductivity and low-temperature performance. Furthermore, in order to further enhance its low-temperature tolerance, the composition of the electrolyte was adjusted via binary solvent replacement method. FQSCs composed of PVA-PFA30-EG exhibited significantly improved high specific capacitances of 131.72 F g −1 at 25 °C and 72.90 F g −1 at −40 °C when tested at 1 A g −1 , with only a 6.36 % capacitance decay after 10,000 cycles at −40 °C. This performance surpasses that of most previously reported low-temperature FQSCs. The novel approach proposed in this paper provides a new avenue for flexible energy storage devices in extremely cold conditions.
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Gang Li,Chunyan Cao,Minkun Cai,Lingyu Zhao,Bingang Xu
Accumulating stockpiles of unutilized coal fly ash (FA) presents a major challenge due to its vast production and limited reuse. Converting FA into soil-like media offers a promising valorization pathway, yet its non-cohesive nature impedes direct utilization. Conventional strategies often rely on the incorporation of organic matter to promote aggregation, but such indirect approaches are inefficient and difficult to control. This work introduces a rapid and controllable approach using a synthetic polymer adhesive to directly form water-stable FA aggregates, overcoming the inefficiencies of traditional organic matter-based aggregation methods. First, an FA–PVA composite is prepared through mixing and drying, after which strong hydrogen bonding between PVA and FA ensures the composite’s high water stability. The bulk composite is then granulated into aggregates with controllable size and assembled into soil. This process converts non-cohesive FA—which otherwise forms dense, waterlogged structures with critically low aeration porosity (<3 %)—into a well-structured soil with balanced hydration and aeration properties (66 % water-holding capacity and 21 % air-filled porosity) with one week. Agricultural validation confirmed successful seed germination and 70 % of the eggplant yield relative to that in natural soil. This work demonstrates a rapid and scalable pathway to convert industrial solid waste into well-structured soil, offering new opportunities for landfill reclamation and the reuse of FA.
研究领域:
环境工程
·
土壤科学
·
材料科学
·
农业工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Jinqiang Sun,Jing Zhang,Xiaoqian Peng,Xu Zhang,Zhipeng Yuan,Xiaochan Liu,Sijia Liu,Xinfu Zhao,Shimo Yu,Xibin Yi
Biomass aerogel is attractive in various applications due to their renewable, biodegradable and eco-friendly advantages. Herein, a novel beta molecular sieve/carboxymethyl cellulose/polyvinyl alcohol composite aerogel (beta/CP) is prepared by direct mixing and directional freeze-drying as an efficient gas adsorbent with hierarchical porosity. The beta molecular sieve is uniformly dispersed in the three-dimensional skeleton of the aerogel. By adjusting the loading mass of the beta molecular sieve to constitute a reasonable porosity and pore size distribution , the synergistic effect between pore structures of different scales improves the adsorption performance. The experiment results of beta/CP-4 show that the CH 4 adsorption capacity can reach 60.33 cm 3 /g at 298 K and 100 bar, which is almost the same as that of the pure beta molecular sieve (62.09 cm 3 /g). The strong interaction between the aerogel and it prevents the molecular sieve agglomeration, improves the pore utilization, and also reduces the cost of using molecular sieve adsorbent. The above results indicate that the composite has good potential for application in the field of CH 4 storage.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2020
·
IF 6.513
Xu Li,Chunsheng Pu,Xin Chen,Feifei Huang,Heng Zheng
Water flooding is one of widely used technique to improve oil recovery from conventional reservoirs, but its performance in low-permeability reservoirs is barely satisfactory. Besides adding chemical agents, ultrasonic wave is an effective and environmental-friendly strategy to assist in water flooding for enhanced oil recovery (EOR) in unconventional reservoirs. The acoustic frequency plays a dominating role in the EOR performance of ultrasonic wave and is usually optimized through a series of time-consuming laboratory experiments. Hence, this study proposes an unsupervised learning method to group low-permeability cores in terms of permeability, porosity and wettability. This grouping algorithm succeeds to classify the 100 natural cores adopted in this study into five categories and the water flooding experiment certificates the accuracy and reliability of the clustering results. It is proved that ultrasonic waves can further improve the oil recovery yielded by water-flooding, especially in the oil-wet and weakly water-wet low-permeability cores. Furthermore, we investigated the EOR mechanism of ultrasonic waves in the low-permeability reservoir via scanning electron microscope observation, infrared characterization, interfacial tension and oil viscosity measurement. Although ultrasonic waves cannot ameliorate the components of light oil as dramatically as those of heavy oil, such compound changes still contribute to the oil viscosity and oil-water interfacial tension reductions. More importantly, ultrasonic waves may modify the micromorphology of low-permeability cores and improve the pore connectivity.
研究领域:
石油工程
·
地球物理
·
材料科学
·
机器学习
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chen Yan,Dandan Liang,Dahong Chen,Yanling Yu,Zhaohan Zhang,Jiajie Zhou,Yujie Feng
The remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil has attracted global attention. Soil microbial fuel cells (SMFC) can induce inherent electric fields to enhance pollutant removal, thereby shedding light on the remediation of PAHs contaminated soil. However, the remediation efficiency is hindered by the high internal resistance within the soil environment. This study proposed the integration of biochar granular (BCG) with SMFC to mitigate internal resistance and enhance PAHs removal efficiencies. The results illustrated that compared to SMFC, 2 % BCG-SMFC increased the removal efficiencies of phenanthrene (PHE) and pyrene (PYR) to 67.4 ± 1.5 % and 58.6 ± 1.9 %. The accompanying power density reached 44.1 mW m −2 , and this was 4.0-fold that of SMFC (11.0 mW m −2 ). Additional investigations demonstrated that adding BCG increased soil porosity and permeability. The porosity rose from 40.7 ± 3.8 % (raw soil) to 48.2 ± 0.5 % (1 % BCG soil) and 52.0 ± 0.3 % (2 % BCG soil), while permeability coefficients for 1 % BCG and 2 % BCG soils were approximately 1.27- and 1.38-fold that of raw soil (0.26 ± 0.01 mm/min). Thus, the ohmic resistance (R ohm ), charge transfer resistance (R ct ), and diffusion resistance (R d ) of the SMFCs with BCG (BCG-SMFCs) were significantly reduced, and this was beneficial for the power output and PAHs removal. Through the analysis of microbial communities, adding BCG increased the enrichment of PAHs-degrading bacteria such as Pseudomonas sp ., Lysobacter sp., Chitinophaga sp., Ralstonia sp., and Phenylobacterium sp . in BCG-SMFCs. Enzymes responsible for PAHs degradation were also highly expressed in BCG-SMFCs. This study suggested a novel approach for enhancing soil porosity and permeability by introducing BCG into SMFC, thereby improving the in situ bioremediation efficiency of PAHs contaminated soil.
研究领域:
环境科学
·
生物技术
·
土壤学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yue Wei,Gang Li,Jiaxu Liu,Yanhui Yi,Hongchen Guo
The sluggish interfacial mass transfer usually hinders the achievement of high-efficiency catalytic transformation of biomass, especially for solvent-free immiscible reagent systems. Herein, amphiphilic hybrid Ti-containing catalysts in situ incorporated with organic groups (Cn-Ti-HMS) were developed for boosting biphasic solvent-free epoxidation of methyl oleate (MO) with H 2 O 2 . Benefiting from the mutual effect between organic/inorganic precursors, the resulting low-defect catalysts exhibit well-mediated surface hydrophilic/hydrophobic balance and porosity by incorporating alkyl groups. Such mediation effect exhibits two superiorities: i) accelerated adsorption of reactants by amphiphilicity; ii) boosted substrate or product diffusion by porosity property. As such, remarkably promoted catalytic properties were achieved when compared with conventional Ti-HMS. Typically, methyl-functionalized C1–Ti-HMS-50 displays the optimal catalytic performance with a 95% conversion of MO. Further mechanism study recognizes the dominant role of surface wettability and Si–OH defects content in influencing MO conversion and epoxidized MO selectivity.
研究领域:
催化
·
材料科学
·
化学工程
·
环境化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）