Processes
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2021
·Vol. 9
·期 2
·391
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IF 2.847
Zhansheng Wu,Pengyun Liu,Zhilin Wu,Giancarlo Cravotto
This study aimed to improve the adsorption capacity of activated carbon (AC) towards naphthalene (NAP) in aqueous solutions. Starch-based AC (SAC) and pulverized coal-based AC (PCAC) were prepared in a one-pot procedure by activation with oleic acid and KOH under microwave heating. Brunauer–Emmett–Teller (BET) specific surface areas reached 725.0 and 912.9 m2/g for in situ modified SAC (O-SAC1) and PCAC (O-PCAC1), respectively. π–π bond, H-bond, and hydrophobic effects were directly involved in the NAP adsorption process. Batch adsorption data were well fitted by pseudo-second order kinetics and the Freundlich isotherm model. As compared to ACs prepared with only KOH activation, NAP adsorption capacities of PCAC and SAC prepared by the one-pot method increased by 16.9% and 13.7%, respectively. Influences of varying factors were investigated in column adsorption of NAP using O-SAC1 and O-PCAC1. Based on breakthrough curves analysis, the larger column height (H), lower flow rate (Q0), and lower initial concentration (C0) resulted in the longer breakthrough and exhaustion times in both cases. Specifically, we concluded that O-PCAC1 exhibits better adsorption capacity than O-SAC1 in the given conditions. The optimized operating parameters were 1 cm (H), 1 mL/min (Q0) and 30 mg/L (C0). Finally, column adsorption data could be well fitted by the Thomas model.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Lu Ye,Yangcheng Lu
With the depletion of rich fluorite ore, flotation process suitable for fine-grained fluorite is of great necessity. In this study, such method was preliminarily developed with a combination of in-situ surface modification and gas-liquid microdispersion. By introducing additives into ball-milling, the interaction between reagents and particles was improved. Through exploitation of selective sedimentation of undesired minerals via pH adjustment, the flotation of fine-grained fluorite was achieved with little or even no depressant in this study. Using a well-designed membrane dispersion device, effective interaction between the particles and bubbles was achieved, with massive expansion of the surface area in a limited space, enabling continuous flotation in a miniaturized device. Satisfactory product grade and recovery were obtained while reducing the use of additives, along with significantly decreased costs related to energy consumption, wastewater and flue gas treatment, and facility investments. The mechanism of this flotation separation strategy was summarized on the basis of empirical data. The strategy was effectively and flexibly applied to fluorite ores with different particle sizes and surface properties.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yena Liu,Qiuping Ran,Jiaqi Guo,Wenyuan Zhu,Rani Bushra,Xuguo Duan,Yang Huang,Zhengbing Jiang,Mohammad Rizwan Khan,Yongcan Jin,Huining Xiao,Junlong Song
Cellulose materials have poor wet strength and are susceptible to acidic or basic environments. Herein, we developed a facile strategy to modify bacterial cellulose (BC) with a genetically engineered Family 3 Carbohydrate-Binding Module (CBM3). To assess the effect of BC films, water adsorption rate (WAR), water holding capacity (WHC), water contact angle (WCA), and mechanical and barrier properties were determined. The results showed that CBM3-modified BC film exhibited significant strength and ductility improvement, reflecting improved mechanical properties of the film. The excellent wet strength (both in the acidic and basic environment), bursting strength, and folding endurance of CBM3-BC films were due to the strong interaction between CBM3 and fiber. The toughness of CBM3-BC films reached 7.9, 28.0, 13.3, and 13.6 MJ/m 3 , which were 6.1, 1.3, 1.4, and 3.0 folds over the control for conditions of dry, wet, acidic, and basic, respectively. In addition, its gas permeability was reduced by 74.3 %, and folding times increased by 56.8 % compared with the control. The synthesized CBM3-BC films may hold promise for future applications in food packaging, paper straw, battery separator, and other fields. Finally, the in situ modification strategy used to BC can be successfully applied in other functional modifications for BC materials.
研究领域:
材料科学
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生物技术
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化学工程
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Bo Jiang,Taoying Kong,Zehua Cai,Weichen Zhu,Rengui Xiao
Low conductivity severely limits the application of polymer materials in dual-ion batteries (DIBs), which results in high voltage drop and capacity degradation. In this paper, a strategy of in-situ modification is proposed, which utilize the adsorption of Na + by polyimide (PI) anode to destroy the symmetric conjugation effect, thus the cycle performance is greatly improved. In this dual-ion battery (PI/NaCl-DIB), polyimide material mixed with trace amounts of NaCI (PI/NaCl), natural graphite (NG) and 1-ethyl-3-methylimidazolium bis(trimethylmethane sulfonyl)imide salt (EMImTFSI) pure ionic liquid are used as anode, cathode and electrolyte, respectively. Due to the addition of NaCI in electrochemical process, the storage mechanism of cations on polyimide anode is changed, and capacity performance is also improved. PI/NaCl-DIB has a maximum capacity of 79 mAh g − 1 at 1 C and still discharges 45 mAh g − 1 at a large rate of 5 C after 300 cycles, with a capacity retention of 96%, while the battery with pure polyimide (PI-DIB) only has 25.0 mAh g − 1 at 1 C. The mechanism of NaCI in the polyimide anode materials is investigated by SEM, XRD, XPS, and CV, and the in-situ modification model is constructed for PI/NaCI anode in DIB.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yongshuang Huang,Jie Li,Meizhou Qi,Guifu Si,Chen Tan
Functionalization and reinforcement of polymers by introducing dynamic sacrificial bonds have attracted increasing attention. In this contribution, the in situ modification of isoprene rubber by the formation of sacrificial bonds during vulcanization has been investigated. The sacrificial bonds were formed by in situ introduction of hydrogen bonds and metal–ligand motifs, which became part of the vulcanized isoprene rubber network by reaction of the former with the vulcanizing agent. The introduction of three-component modifiers (nadic anhydride (NA), 2-aminopyrimidine (AP), and ZnCl2) and the molar ratio of these components can greatly affect the tensile strength and modulus of the vulcanized rubber. Under the external load, the sacrificial bonds preferentially rupture prior to the covalent network and facilitate rubber chain orientation, resulting in high fracture energy. In addition, the dynamic behavior of the sacrificial bonds and the hysteresis behavior of the vulcanized rubbers were studied.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 60
·期 21
·3054-3063
·
IF 3.046
Xinqiang You,Jiaqi Chen,Lin Teng,Jiuyang Lin,Xiaocheng Lin
Diffusion dialysis (DD) for acid recovery is significantly restricted by the poor acid dialysis coefficient ( U H + ) of anion exchange membranes (AEMs). To overcome such problem, porous AEMs with extremely high free space volume have been fabricated herein based on porous membrane substrate, drawing inspiration from the dissolution-diffusion concept. Specifically, chloromethylated polyethersulfone (CMPES) has been used as the starting material to create the porous substrate via non-solvent phase inversion, then in-situ crosslinked and quaternized using ethylenediamine (EDA) and N-methylimidazole (NMI), respectively. In this study, the degrees of modification of EDA and NMI are controlled to adjust the microstructure and DD performance of the produced porous AEMs. The ideal AEM's U H + and acid/salt separation factor ( S ) are 4.3 and 2.6 times greater, respectively, than those of the commercial DF-120 membrane at the same condition. Additionally, it shows strong organic solvent resistance and thermal stability, and therefore demonstrate the potential for widespread use. Graphical
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hao Wang,Renting Huang,Wei Mao,Hao Xu,Chutong Ling,Junru Zhao,Fan Yi,Yongxin Zhou,Jinghong Zhou
Iron-based metal-organic frameworks (MOFs) represent a potentially important tool for controlling organic pollutants . However, the structural stability of most iron-based MOFs in the aqueous environment is limited. Therefore, this study sought to improve the aqueous stability and photocatalytic activity of MIL-101(Fe) using an in-situ modification strategy. A novel and highly water-stable MIL-101(Fe)@IPA 4 was prepared using ligand regulation. Owing to the in-situ modification effect, MIL-101(Fe)@IPA 4 exhibited remarkable hydrophobicity with a water contact angle at 102.4° while maintaining minimal leaching of iron ions (0.46 mg/L), even after five cycles of photocatalysis . Under MIL-101(Fe)@IPA 4 /UV/H 2 O 2 conditions, the removal rates of ciprofloxacin and total organic carbon reached 100% and 49.16%, respectively, within 60 min. These researches suggest that introducing IPA improves the light absorption properties of MIL-101(Fe)@IPA 4 and facilitates electron-hole separation, thereby promoting the generation of active species. The ecotoxicity assessment of major degradation intermediates of ciprofloxacin was conducted using the ECOSAR system. Our findings provide novel insights for enhancing the water stability of iron-based MOFs through an in-situ modification strategy, which is crucial for pollution control efforts.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qingdi Mu,Lujie Sheng,Shuhui Chen,Yuanfa Liu,Maicun Deng,Jizhong Ren
Defect engineering of metal organic frameworks (MOFs) is an emerging effective approach for manipulating their microporosity structure. They are very promising but challenging to achieve significant gas separation performance improvements for mixed matrix membranes (MMMs) fabrication. Herein, we propose a novel thermal induced in-situ defect engineering strategy of ZIF-8 in MMMs by carefully post controlled annealing (above polyimide matrix T g and below ZIF-8 T d ). Attractively, the thermal-triggered polyimide matrix (P84 HT) crosslinking repairs interfacial voids between ZIF-8 and P84 HT. The resulting advanced MMMs exhibit more gas sorption sites and diffusion pathways owing to the missing Zn-N bond of ZIF-8, while exciting enhancement of H 2 /CH 4 and H 2 /N 2 separation performance is obtained compared with the pristine P84 HT membrane. Furthermore, after in-situ defect engineering at 400 °C, the H 2 permeability of the advanced MMMs with 20 wt% ZIF-8 loading is 123.8 Barrer, 19.4 times higher than the pristine P84 HT membrane (6.4 Barrer), while the H 2 /CH 4 and H 2 /N 2 selectivity almost remains essentially unchanged. More importantly, this facile but very effective method demonstrates a new direction to regulate structure of polyimide/MOFs based MMMs for gas separation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2018
·
IF 2.795
Meihong Liu,Chuang Yu,Yiyang Wu,Zhenhua Lü,Sanchuan Yu,Congjie Gao
In situ improvement of fouling resistance of the state-of-the-art polyamide reverse osmosis membrane module on the basis of the fouling characteristic of the fluid to be treated is of great practical significance. In this work, in situ modification was performed with the spiral wound polyamide reverse osmosis membrane module for improved fouling resistance to specific foulant. Small molecular monomers of amidosulfonic acid (ASA), diethanolamine (DEA) and piperazine (PIP) were grafted onto the surface of the flat-sheet polyamide-based thin-film composite membrane within the module separately through 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC)-activated amidation of carboxyl groups. The results of fouling experiments indicated that the fouling resistance of the polyamide reverse osmosis membrane module to the model foulants of bovine serum protein (BSA), sodium alginate (SA) and dodecyl trimethyl ammonium bromide (DTAB) could be effectively improved through grafting monomers ASA, DEA and PIP, respectively, showing significant reduction in declines of membrane flux to aqueous BSA, SA and DTAB solutions by 47.2%, 41.3% and 34.4%. The changes of membrane surface hydrophilicity and negative charge were in charge of the improved antifouling property. The in-situ modification was also found to slightly enhance membrane salt rejection and have nearly no influence on membrane water flux.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 15
·5599
·
IF 3.252
Siyuan Chen,Fanghui Liu,Yang Zhou,Xiuping Lan,Shouzhen Li,Lulu Wang,Quan Xu,Yeqing Li,Yan Jin
Proppant is an essential material in hydraulic fracturing, and it can support artificial fractures for a long time. However, few people have applied proppant and conductive materials in the in-situ modification of shale oil. Here, we developed a graphene and resin coated (GRC) proppant with electrically conductive properties. The electrical conductivity of the GRC proppant improved by four orders of magnitude. The GRC proppant has a 54.58% improvement in suspension and 22.75% increase in settlement time at 0.25 wt% concentration compared with uncoated proppant. The GRC proppant’s adhesion reached 68.34 nN under 1 μN load force, increasing by 63.13% compared to uncoated proppant. This new electrically conductive proppant can be used as a conductive carrier to improve the efficiency of electric heating in in-situ modification technology of shale oil.Keywords:shale oil;proppants;electrical conductivity;in-situ modification
研究领域:
材料科学
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石油工程
·
化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Feng-Ping Wang,Bo Li,Mei-Yan Sun,Fazli Wahid,Hong-Mei Zhang,Shu-Jun Wang,Yan-Yan Xie,Shi-Ru Jia,Cheng Zhong
Bacterial cellulose (BC) is a promising biopolymer, but its three-dimensional structure needs to be controllable to be used in multiple fields. BC has some advantages over other types of cellulose, not only in terms of purity and properties but also in terms of modification (in situ modification) during the synthesis process. Here, starches from different sources or with amylose/amylopectin content were added to the growth medium to regulate the structural properties of BC in-situ. The obtained BC membranes were further modified by superhydrophobic treatment for oil-water separation. Starches alter the viscosity of the medium, thus affecting bacterial motility and cellulose synthesis, and adhere to the microfibers, limiting their further polymerization and ultimately altering the membrane porosity, pore size, and mechanical properties perpendicular to the BC fibril layer direction. The average pore diameter of the BC/PS membrane increased by 1.94 times compared to the initial BC membrane. The chemically modified BC/PS membrane exhibited super-hydrophobicity (water contact angle 167°), high oil-water separation flux (dichloromethane, 23,205 Lm −2 h −1 MPa −1 ), high separation efficiency (>97%). The study provides a foundation for developing methods to regulate the network structure of BC and broaden its application.
研究领域:
生物技术
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材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Haotian Hu,Zijian Qi,Cong Chen,Zhongbo Zhou,Liang Shen
Polyamide (PA) nanofiltration (NF) membranes inherently struggle with the permeability-selectivity trade-off and membrane fouling. This study deploys antibiotics, specifically aminoglycoside (gentamicin, streptomycin, amikacin, kanamycin) and quinolone (ciprofloxacin), to construct PA NF membranes through in-situ or surface modification strategy. For the first time, we systematically investigated the influences of antibiotic molecular structures and modification pathways on membrane properties and performances. By correlating antibiotic chemical structures with modification efficacy, we disclose that aminoglycosides, owing to their high reactivity and multiple reactive sites, outperform quinolones in tailoring membrane properties and performance. In-situ modification regulates amine monomer diffusion kinetics and alters polymerization reaction mechanism, yielding thinner, more permeable PA layers with tailored bulk properties. In contrast, surface modification enables higher antibiotic loading and primarily adjusts surface characteristics, endowing the membrane with superior antifouling performance. NF membranes engineered by both approaches significantly surpass the pristine NF membrane in separation performance and fouling resistance: in-situ modified membranes achieve an exceptional water flux (224 % increasement), while surface-modified membranes exhibit superior antibiotic/NaCl selectivity (162) for pharmaceutical wastewater treatment coupled with outstanding fouling resistance against both organic and microbial foulants. This work establishes antibiotic-mediated membrane engineering, offering a scalable solution to address permeability-selectivity-fouling trilemma and advancing sustainable water purification technologies.
研究领域:
膜科学
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水净化
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高分子化学
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环境工程
·
抗生素应用
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）