Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Zhonghua Xue,Yali Feng,Haoran Li
To achieve the efficient flotation desilication of magnesite tailings (MT), this research systematically investigated the selective adsorption behavior of dodecylamine (DDA) and its compound collectors formed by mixing with Polysorbate surfactants and DDA. The investigation integrated experimental and simulation approaches. The results of the flotation experiment showed that the compound collector improved the MgO grade of the concentrate by 0.20% compared to DDA alone. Additionally, the SiO 2 content was reduced by 1.04%, and the concentrate achieved a MgO grade of 41.95%. Molecular simulations provided new insights into the enhanced flotation mechanism with compound collectors, focusing on the size effect of collectors at the solid/liquid interface and bubble modification of collectors at the gas/liquid interface. The analysis indicates that small-size compound collectors can optimally utilise the collecting performance of individual DDA molecules, thereby effectively reducing reagent consumption per unit. Correlation tests indicate a notable enhancement in the hydrophobicity of the quartz surface subsequent to the application of the compound collector, suggesting that the compound collector exhibits a more solidophilic characteristic than DDA. The collectors of the compound facilitate the movement of water molecules on the bubble surface. This leads to a significant increase in the hydrophobicity of the bubble surface, which in turn increases the likelihood of bubble-particle contact collision and adhesion. Compared to DDA, the low dosage of compound collector has the potential to reduce costs and lay the foundation for industrial-grade MT flotation purification.
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Journal of Cleaner Production
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2024
·
IF 9.7
Shuai Han,Zhe Wang,Junjian Yu,Fei Wang,Xiangwei Li
Low-silica SOD zeolites are among the most promising inorganic materials for mixed matrix membranes (MMMs). However, the gas separation performance is severely hindered by the non-selective voids formed by both the zeolite and polymer membranes, as well as the rigid layer. In this work, SOD-liquid-M2070 PL type I porous liquid was synthesized and subsequently filled into an Amidoxime-functionalized polymer of intrinsic microporosity (AO-PIM) to prepare MMMs. The fillers and MMMs were characterized using FTIR, SEM, TGA, XRD, and gas permeation techniques. SOD-liquid-M2070 PL facilitates the rapid diffusion of CO 2 and H 2 gas molecules for efficient gas separation. The liquid-like fluidity of SOD-liquid-M2070 PL improves the formation of non-selective pores in the SOD and polymer matrix membranes to enhance gas permeability and selectivity. The CO 2 , H 2 permeability and CO 2 /N 2 , H 2 /N 2 selectivity of MMMs composed of 5 wt% SOD-liquid-M2070 PL with optimal filling ratio were increased by 248%, 246%, and 173%, 222%, respectively, compared with pure membranes. It exceeds the 2008 Robeson limit for H 2 /N 2 and approaches much closer to the 2019 Robeson limit for CO 2 /N 2 . The field of green environment presents a promising development prospect for low silica SOD zeolite, which exhibits high separation efficiency.
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MACROMOLECULES
·
2024
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IF 5.1
Yikai Sun,Chengfeng Zhang,Shu Wang,Zhenghai Tang,Xinrang Li,Xianming Zhang,Baochun Guo
High gas barrier rubber composites are crucial for the applications requiring the combination of high resilience and gas impermeability. Layered fillers are commonly used to enhance the gas barrier performance by reducing free volume and creating tortuous gas diffusion paths. However, it remains challenging to strengthen interfacial interactions and manipulate filler distribution, which significantly affect free volume and gas diffusion paths. Herein, we present a facile strategy to build a segregated structure in modified rubber composites with dynamic interfacial cross-linking toward mechanically robust, high gas barrier elastomer composites. Concretely, boehmite (BM) nanoplatelets modified with biobased phytic acid (PA) are utilized to cross-link epoxidized natural rubber (ENR), forming dynamic β-hydroxy phosphate ester cross-links for strong interfacial interaction. This system allows a segregated structure to be readily established by hot pressing the compounds containing ENR gum, PA-modified BM, precross-linked ENR granules and zinc acetate. The volume exclusion effect of ENR granules drives the selective dispersion of BM, generating a two-phase segregated structure with the bridged interfaces across phases formed via bond exchange of dynamic cross-links. This results in excellent gas barrier performance along with distinctly improved mechanical properties. Notably, the N2 permeability of the segregated composites is reduced by 90% to 4.23 × 10–19 m3·m/(m2·s·Pa) compared to neat ENR. Additionally, improved fire safety is achieved benefiting from the combined effects of PA, BM, and the segregated structure. This work offers a promising and scalable approach for fabricating high-performance elastomer composites that combine outstanding gas barrier properties, mechanical durability and flame retardance, making them suitable for a wide range of demanding applications.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shengyan Liu,Wensheng Lin,Ao Wang,Wei Chen,Liangying Yu,Chong Tian
The mass discharge of mercury from coal-fired power plant has caused great harm, abating mercury emissions is of preoccupation for protecting public environmental safety and human health. Metal oxides are often used for Hg 0 removal in the flue gas. In this paper, a hollow tubular MnO x (MnCot) was successfully prepared by rapid flame annealing using cotton fiber as a sacrificial template. The MnCot were then well characterized and tested for its capability for Hg 0 removal in flue gas. The results indicate that the flame assisted synthesis method for rapidly prototyping metal oxides with typical structures is achievable. The hollow tubular structure of the cotton fiber is well reprinted with good crystallization of Mn 3 O 4 . The inner diameter of the hollow tubular MnCot is about 10 μm, and the thickness of the tube is about 1 μm. The Hg 0 removal efficiency on MnCot can be maintained as high as 90 % under simulated flue gas atmosphere below 240°C. O 2 and NO have a positive effect on the Hg 0 removal, which can act as the fresh active sits thus enhancing its capability for Hg 0 removal. However, the presence of SO 2 will result in the surface sulfation on MnCot, thus deteriorating its capability for Hg 0 removal. Further, the competitive adsorption between SO 2 and Hg 0 on the material will also weaken its capability for Hg 0 removal. The hollow tubular MnO x rapidly prepared by one-step flame annealing has a good industrial application potential for Hg 0 removal in coal-fired flue gas.
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Journal of Analysis and Testing
·
2024
·
IF 5.5
Tao Haijuan,Liu Jiale,Guo Weikang,Shuai Qin,Huang Lijin
Covalent organic frameworks (COFs) have been widely used to prepare solid-phase microextraction (SPME) coatings due to their large specific surface area and adjustable pore size. However, the weak inherent hydrophilicity of COFs restricts their extraction performance for polar phenolic compounds. In this work, COFs were combined with chitosan (CS) via Schiff base reaction to prepare novel SPME coating materials. The incorporation of CS, which contains abundant hydrophilic functional groups, effectively enhanced the hydrophilicity of the CS/COF composite, thus boosting its interaction affinity towards polar phenols. In combination with gas chromatography—mass spectrometry (GC–MS), an efficient and sensitive analytical method was established. Under optimal conditions, the developed method demonstrated a broad linear range (5.0–1.0 × 10 4 ng/L, R 2 > 0.9972), low detection limits (0.78–1.3 ng/L), good reproducibility (relative standard deviations (RSDs) < 8.8%), and excellent enrichment factors (5993–41,441). Moreover, the established method was successfully applied to quantify phenolic compounds in grapes, and the recoveries ranged from 92.2% to 111% with RSDs of 2.3%–7.8%, meeting practical application requirements. This study provides valuable insights into the efficient analysis and determination of trace polar contaminants in real samples.
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Journal of Energy Storage
·
2024
·
IF 8.9
Yongqi Wang,Rongwei Huang,Jiyue Hou,Ao Li,Wenchang Han,Wengxiang Ai,Chunman Yang,Qian Wang,Yiyong Zhang,Xue Li
s Gas generation in Li-ion batteries has a negative impact on their electrochemical performance and safety characteristics, the accumulation of flammable gases may result in explosion and combustion. In this work, we investigated the electrochemical performance and gas behavior of LiFePO 4 // Li 4 Ti 5 O 12 lithium-ion full batteries with varying negative/positive(N/P) ratios. Firstly, studied their initial capacity, initial efficiency, multiplicity, and cycling performance. Additionally, we employed in situ differential electrochemical mass spectrometry (DEMS) to analyze the gas precipitation behavior of the full cell during charging and discharging at varying N/P ratios. Electrochemistry data indicate that excessively high or low N/P ratios impact the capacity performance, cycle stability, and gas behavior of the materials. DEMS monitoring revealed that as the N/P ratio increases, so do the production rates of H 2 , CO 2 , and CO. However, the production rate of C 2 H 4 increases as the N/P ratio decreases. The continuous accumulation of gases can adversely affect battery performance. The optimal N/P ratio for achieving maximum performance with minimal gas production is found to be 0.95. This suggests that the N/P design is crucial in optimizing the electrochemical performance of the complete battery, particularly its safety performance.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Xifeng Zhu,Yuan Liu,Xingliang Ji,Zhaoyang Zhu,Yi Xiao,Tao Wang,Jiawei Wang,Wei-Ping Pan
Emissions from coal-fired or biomass power plants are often released under conditions of high-humidity, posing significant challenges to the effectiveness and durability of adsorbents and catalysts. In industrial settings, adsorbents and catalysts are often deactivated due to water presence, which can block active sites and reduce their effectiveness. Traditional hydrophobic modification methods often cover these adsorption sites, thus reducing a material’s adsorption capacity for volatile organic compounds (VOCs). In this study, we propose a mild physical blending method, incorporating hydrophobic polymer poly(divinylbenzene) (PDVB) with zeolite-templated carbon (ZTC), to regulate the local environment of ZTC for capturing VOCs under humid conditions without damaging the chemical structure of ZTC. Numerous characterization results confirm that incorporating PDVB does not affect the structure of ZTC. The hydrophobic modification increased the adsorption capacity of ZTC by 205% at 15% water content, while the water contact angle increased from 48 to 138°. Vinyl and phenyl groups in PDVB facilitated the rapid repulsion of water molecules from the surface. Molecular dynamics simulations indicated that the hydrophobic channels promoted the desorption of water molecules, and the number of escaped water molecules increased by 286%. Additionally, we propose an industrial application model for large-scale gas emissions with low-concentration VOCs under humid conditions, which enables simultaneous adsorption and desorption, thereby enhancing operational efficiency.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xiaochun Zheng,Weiwei Kang,Yarong Jin,Xin Zhang,Wenxuan Wang,Dongsheng Li,Shutong Wu,Lin Chen,Shichao Meng,Rong Dai,Ziliang Zheng,Ruiping Zhang
Rheumatoid arthritis (RA) is currently one of the most common systemic autoimmune disorders, with no clinically effective theranostics. Therapeutic manipulation of the gasotransmitter hydrogen sulfide (H 2 S) has exhibited promising potential as an innovative strategy in RA, whereas limited with non-targeting, low solubility, and systemic toxicity. In this work, based on the physicochemical and structural advantages of stimulus-responsive nanotechnology, we develop multifunctional glutathione (GSH)-responsive H 2 S nanogenerators (BDMA NGs), achieving activatable precise second near-infrared fluorescence (NIR-II FL)/photoacoustic (PA) bimodal imaging-guided gas/chemotherapy synergistic therapy. Contributed to the suitable size and excellent biocompatibility, the BDMA NGs accumulate passively in the RA region and then feature a responsive deformation reaction with GSH to release functional small molecules: H 2 S and methotrexate (MTX). The H 2 S undergoes a mineralization process with Ag + ions in situ, resulting in the rapid formation of Ag 2 S to “turn on” the NIR-II FL/PA signals. Remarkably, the effective generation of H 2 S downregulates hypoxia-inducible factor-1 α (HIF-1 α ) and promotes nuclear factor erythroid 2-related factor 2 (Nrf2) nuclear translocation, thereby restoring homeostasis in the RA microenvironment and facilitating the reprogramming of pro-inflammatory macrophages (M1) into anti-inflammatory phenotype (M2). Moreover, the controlled release of MTX, clinically approved drug for RA, synergistically promotes repolarization to further suppress local inflammation. Overall, the H 2 S-based nanogenerators BDMA NGs present a sophisticated and versatile strategy for implementing stimuli-responsive imaging and M1-to-M2 repolarization, demonstrating significant potential in the theranostics of RA and clinical transformation.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
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IF 11.2
Tian Yuan,Yong Wang,Yiming Zhou,Aijia Zhang,Jie Meng,Ling Li,Wenming Zhang
Highly sensitive sensors with extensive applications are extremely desired in the next-generation wearable electronics for human motion monitoring, human-machine interface and intelligent robotics, while single-functional pressure sensors cannot fulfill the growing demands of modern technological advances. Herein, an all-fabric and multilayered piezoresistive sensor based on conductive metal-organic framework/layered double hydroxide (cMOF/LDH) hetero-nanoforest is demonstrated to achieve multiple applications including pulse detection, joint motion detection, sound detection and information transmission. Benefiting from the synergism of cMOF/LDH hetero-nanoforest and multilayered structure, the sensor exhibits a high sensitivity (1.61×10 9 kPa −1 ) over a broad pressure range (0-100 kPa), a fast response/recovery time (71 ms/71 ms) and a low detection limit (18 Pa), as well as reliable dynamic stability (8000 cycles). It is gratifying to note that the introduction of cMOFs endows the sensor with the potential to detect the concentration of NH 3 (1-100 ppm) and sunlight intensity (10-100 mW cm −2 ). This work shows great potential in multifunctional sensing, which enlightens a strategy for advancing the development process of highly sensitive intelligent wearable devices.
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ANALYTICAL CHEMISTRY
·
2024
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IF 6.7
Shengrui Xu,Huimin Li,Li Xiao,Suling Feng,Jing Fan,Janusz Pawliszyn
A simple, sustainable, and sensitive monitoring approach of micro/nanoplastics (MNPs) in aqueous samples is crucial since it helps in assessing the extent of contamination and understanding the potential risks associated with their presence without causing additional stress to the environment. In this study, a novel strategy for qualitative and quantitative determination of MNPs in water by direct solid-phase microextraction (SPME) coupled with gas chromatography–mass spectrometry (GC-MS) was proposed for the first time. Spherical poly(methyl methacrylate) (PMMA) and irregularly shaped polyvinyl dichloride (PVDC) were used to evaluate the feasibility and performance of the proposed method. The results demonstrated that both PMMA and PVDC MNPs were efficiently extracted by the homemade SPME coating of nitrogen-doped porous carbons (N-SPCs) and exhibited sufficient thermal decomposition in the GC-MS injection port. Excellent extraction performances of N-SPCs coating for MNPs are attributed to hydrophobic cross-linking, electrostatic forcing, hydrogen bonding, and pore trapping. Methyl methacrylate was identified as the marker for PMMA, while 1,3-dichlorobenzene and 1,3,5-trichlorobenzene were the indicators for PVDC. Under the optimal extraction and decomposition conditions, the proposed method exhibited ultrahigh sensitivity, with a limit of detection of 0.0041 μg/L for PMMA and 0.0054 μg/L for PVDC. Notably, a programmed temperature strategy for the GC-MS injector was developed to discriminate and eliminate the potential interferences of intrinsic indicator compounds. Owing to the integration of sampling, extraction, injection, and decomposition into one step by SPME, the proposed method demonstrates exceptional sensitivity, eliminating the necessity for complex sample pretreatment procedures and the use of organic solvents. Finally, the proposed method was successfully applied in the determination of PMMA and PVDC MNPs in real aqueous samples.
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PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2017
·Vol. 41
·期 6
·1385-1394
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IF 2.557
Jun-Hui Zhang,Sheng-Ming Xie,Bang-Jin Wang,Pin-Gang He,Li-Ming Yuan
Porous organic cages composed of discrete cage molecules have attracted considerable recent attention as gas adsorption materials and separation media. In this study, we report a homochiral porous organic cage CC5 with a large cavity and pore windows as a novel stationary phase for high-resolution gas chromatographic separations. The capillary column was prepared by a static coating method. A large number of racemic compounds have been resolved on the coated capillary column, including derivatized amino acids, alcohols, alcohol amines, esters, ethers, ketones, and epoxides. It is interesting that the CC5-coated capillary column exhibits significant chiral recognition complementarity to a commercial β-DEX 120 column and a previously reported homochiral porous organic cage CC3-R-coated column, which could expand the range of the analytes amenable to separation on porous organic cage-based capillary columns. Moreover, the fabricated column also shows excellent selectivity for the separation of positional isomers, including the challenging ethylbenzene and xylene isomers. Experimental results demonstrate an excellent separation performance and stability of the CC5-coated column, making it promising for gas chromatography applications.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Shuna Zhao,Hao Liu,Mi Li,Lin Jiang
5-Aminotetrazole/strontium nitrate (5AT/Sr(NO 3 ) 2 ) propellant is widely utilized as green gas generating agent in fire extinguishers. To enhance the combustion rate and modify the gas production performance of 5AT/Sr(NO 3 ) 2 propellant, this study investigated the catalytic effects of adding different metal oxides (Bi 2 O 3 , PbO, TiO 2 , and CoO) on its pyrolysis and combustion process. The pyrolysis behavior, pyrolysis mechanism and combustion performance of 5AT/Sr(NO 3 ) 2 propellants were studied by using thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning caborimetry (DSC), mass spectrometry (MS), fourier transform infrared spectroscopy (FTIR) analysis and closed bomb vessel tests. Experimental results indicated that Bi 2 O 3 and PbO predominantly facilitated the thermal decomposition process of 5AT, while TiO 2 and CoO primarily catalyzed the thermal decomposition of Sr(NO 3 ) 2 . Certainly, the addition of metal oxides as catalysts to 5AT/Sr(NO 3 ) 2 propellant holds significant potential for improving the application as a gas generating agents in fire extinguishers.
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