INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Shahid Hussain,Haifeng Dong,Yanqiang Zhang,Guoxiong Zhan,Shaojuan Zeng,Huifang Duan,Xiangping Zhang
The efficient capture of carbon dioxide (CO2) has industrial, economic, and environmental significance. Here, CO2 capture performance in terms of CO2/CH4 selectivity for the zeolitic imidazolate framework (ZIF-8) is enhanced by impregnation of 1-n-butyl-3-methylimidazolium dicyanide [BMIM][DCA]. The preparation of ionic liquids (ILs)/ZIF-8 composites, their comprehensive characterization, and the impact of IL impregnation are all investigated. The crystal structure and morphology of ZIF-8 remained intact even after the impregnation of ILs, according to X-ray diffraction and scanning electron microscopy studies. The infrared spectroscopy known as Fourier transform infrared spectroscopy determines the interaction between ILs and ZIF-8 in the composite. The isotherm fitting was also performed by dual site Langmuir models, which showed good agreement with the experimental results. The CO2/CH4 selectivity results demonstrated that the ideal selectivity for the IL-impregnated ZIF-8 composite has five times higher selectivity than pristine ZIF-8 at 0.05 bar which is the highest reported selectivity. The normalized selectivity of this type of IL/ZIF-8 composite is also higher. This study suggested that the IL/MOF composite with a tunable structure have a strong potential for enhanced acid gas separation performance to meet the environmental challenges.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Hao Wang,Nianzu Zhang,Xiaopo Wang
Densities and viscosities for the binary mixtures of n-nonane/1-heptanol, n-nonane/1-octanol, n-nonane/1-nonanol, and n-nonane/1-decanol were presented in this work. The measurements were carried out using an Anton Paar digital vibrating U-tube densimeter and an Ubbelohde capillary viscometer, and the entire composition range was investigated from 303.15 to 333.15 K at atmospheric pressure. In addition, the excess molar volumes and viscosity deviations of the mixtures were calculated and discussed. The Redlich–Kister equation was used to correlate the two derived properties. Furthermore, the viscosities of the studied mixtures were fitted to Eyring-type models.
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INSTRUMENTATION SCIENCE & TECHNOLOGY
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2021
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IF 1.584
Zhao-chan Liu,Li Yang,Rong-rong Xing,Xuan Chen,Xiao-hong Bai,Shuang Hu
This work describes three phase dispersive liquid-liquid microextraction based on reverse micelles for the determination of Q-markers of cinnamic acids (caffeic acid, p-hydroxycinnamic acid, ferulic acid, and cinnamic acid) in traditional Chinese medicine followed by high performance liquid chromatography (HPLC) analysis. The variables influencing the procedure were optimized separately. Enrichment factors from 110 to 189, linearities from 1.2 to 960 ng mL−1 with r2 exceeding 0.9943, detection limits from 0.1 to 0.6 ng mL−1, excellent precision with relative standard deviations below 5.6%, and good relative recoveries from 80.0% to 113.3% were achieved. In addition, the mechanism of the procedure was explored by comparison with conventional dispersive liquid-liquid microextraction at the optimum conditions. The results showed that the developed microextraction procedure improved the sensitivity and consumed less organic solvent and is a greener approach.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Zhihui Liao,Ning Pan,Jiale Liu,Chunyan Ma,Xue Xia,Jianju Deng,Guohui Yang,Xiaoan Li,Zhengguo Chen,Wencai Cheng,Wei Zhang,Xiaoqin Nie,Faqin Dong
The conventional decay cell technology faces challenges in addressing the growing demand for medical isotopes and the increasing volume of radioactive wastewater . To overcome this, a kind of strongly alkaline anion-exchange fiber (N-AF) was employed in this study for the treatment of radioactive wastewater containing iodine, specifically from nuclear medicine applications in hospitals. A series of adsorption experiments were conducted to assess the potential of N-AF as an adsorbent for removing iodide ions. The static and dynamic adsorption capacities of N-AF for iodide ions were determined to be 347.0 and 288.4 mg g −1 , respectively. Characterization techniques such as SEM/EDS, FT-IR, and XPS confirmed the successful capture of iodide ions by N-AF. Furthermore, N-AF demonstrated effective purification of radioactive wastewater containing iodine from actual nuclear medical treatment, reducing the gross-activity from 563.50 to 0.29 Bq L −1 . This achievement enables the total activity of radioactive wastewater to comply with the water pollutant discharge standard for medical institutions (GB18466–2005). This outcome holds significant importance in mitigating the risk of radioactive contamination and enhancing treatment rate.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2026
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IF 4.1
Qi Junfeng,Liu Junhe,Hu Chanjuan,Wang Qingqing,Guo Yanhong,Zhang Mengdie,Hu Li,Lin Bin,Li Wansen
Excessive addition of ethyl maltol (EMA) to foods poses potential health risks, highlighting the need for reliable monitoring. Herein, an integrated Fe(III)-driven liquid-phase microextraction (LPME)–spectrophotometry system was developed for selective and high-throughput EMA determination. Fe(III) in the acceptor phase served dual roles: as a chemical trap achieving >90% extraction efficiency and as an in situ chromogenic probe enabling direct detection. This unique design combines membrane-mediated matrix exclusion with coordination-assisted extraction, resulting in enhanced sensitivity and improved resistance to matrix interference. Density functional theory calculations revealed that Fe(III) facilitated the forward extraction by reducing the transmembrane transfer free energy barrier while suppressing back-extraction via weakening EMA–membrane solvent interactions. Under the evaluated conditions, the system offered a broad linear range (7.8–1500 μM, R 2 > 0.999), low detection limit (0.67 μM), and satisfactory selectivity toward structural analogues. Validation in diverse food matrices yielded recoveries of 88–107% with good agreement with HPLC–UV ( R 2 > 0.99). The minimal solvent consumption, high throughput, and favorable greenness further highlight its practical utility. More than an EMA detection method, this work provides a proof-of-concept for the coordination-driven LPME strategy that intrinsically integrates sample preparation with in situ signal generation, offering new insights into the design of a mechanism-driven microextraction system. Graphical abstract
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COMPOSITES SCIENCE AND TECHNOLOGY
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2023
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IF 9.1
Weihao Yuan,Ziyang Zhang,Yueshan Li,Yudong Huang,Zhengxiang Zhong,Zhen Hu
To increase the service life of composite materials, self-healing, and damage detection are essential. Although a lot of research has been done on self-healing and damage-reporting materials, it is still difficult to combine self-healing with in-situ and real-time damage detection in bulk resin and composites. By integrating extrinsic self-healing based on microcapsules and internal self-healing based on coordination interaction, the simultaneous self-healing of matrix and interface damage of fiber-reinforced composites was achieved in this study. Specifically, two-component microcapsules filled with epoxy/mercaptan repair agent were inserted into the matrix and Ag nanoparticles (AgNPs) were introduced into the surface of carbon fiber by electroless plating . Upon the rupture of microcapsules, matrix self-healing was used to reach a desirable level of synchronous healing efficiency. In the meantime, the excess sulfhydryl reacted with AgNPs on the fibers to establish a coordination bond for interface self-healing. More intriguingly, the high exothermic action of epoxy resin and mercaptan repair agent in the self-healing process was observed when using infrared thermal imaging technology for in-situ and real-time damage detection.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 6
·e54927
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IF 3
Kang Yang,Yongping Niu,Xiaowei Wang,Sanming Du,Yongzhen Zhang,Junkai Zhang,Junqing Cai
Cured epoxy resins have poor abrasion resistance, which shortens the service life of the material. This work aims to improve the tribological properties of epoxy resins by coupling self-lubrication and auto-healing. In this study, linseed oil microcapsules with an average particle size of 38.57 μm and good thermal stability were successfully prepared by in situ polymerization. The effects of microcapsule content on the tribological, mechanical, and self-healing properties of the composite coatings were studied. It was demonstrated that the composite coating has outstanding self-lubricating properties. The coefficient of friction reduced from 0.634 (pure epoxy resin) to 0.0459 (epoxy resin with 10 wt.% linseed oil microcapsules). Wear rate reduced from 7.16 × 10 −4 mm 3 /(N m) to 1.74 × 10 −5 mm 3 /(N m). The self-lubricating mechanism of the coating was investigated by SEM and EDS, which indicated that the formation of uniform and continuous lubricating film on the surface of the friction pairs was the key to improving the wear resistance of the material. In addition, the linseed oil released after the microcapsules rupture can repair the abrasion marks by reacting with oxygen during the friction process. The dual-functional effect of linseed oil microcapsules prolongs the life of epoxy resin coating and expands its application range.
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GREEN CHEMISTRY
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2023
·Vol. 25
·期 23
·10020-10032
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IF 9.8
Qiyuan Zheng,Li Zeng,Zuoying Cao,Shengxi Wu,Qinggang Li,Mingyu Wang,Wenjuan Guan,Guiqing Zhang
As the production of electric vehicles and lithium-ion batteries continues to rise, concerns over resource scarcity and supply shortages of critical metals, including Cu, Ni, Co, Mn, and Li, have become increasingly urgent. To address these concerns and promote environmental protection, there is a growing demand for the recycling of hazardous waste containing these critical metals as secondary resources. Therefore, this paper proposes a novel synergistic solvent extraction system of D2EHPA-NNPA, which fills a gap in the lack of a suitable extraction system for the hydrometallurgical industry of secondary resources containing Cu, Ni, Co, Mn, and Li. With the specific extraction sequence of D2EHPA-NNPA, a novel process has been designed and proposed for the stepwise extraction of Cu, Ni, Co, Mn, and Li from secondary resources, which significantly simplifies process flows while avoiding cross-contamination of the extractants and the production of industrial wastewater. Furthermore, the proposed “extraction-scrubbing-stripping” process has been investigated from both macroscopic and microscopic perspectives, demonstrating that the novel synergistic solvent extraction system of D2EHPA-NNPA is a viable option for industrial applications to promote a circular economy and achieve sustainability objectives.
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Particuology
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2023
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IF 3.5
Rui Han,Ningning Zhang,Anning Zhou,Zhen Li,Jinzhou Qu,Hong Wang
Coal gasification fine slag (CGFS) is a solid waste containing residual carbon and ash generated during the coal gasification process, and the separation of the two components is the essential way to realize its environmental pollution reduction and resource value increase. Froth flotation is the preferred method for separating CGFS, but there is a barrier of low carbon recovery in this process due to the extensive adsorption of collector by the well-developed pores on residual carbon. In this study, a sufficiently simple yet innovative collector, a mixture of hydrophobic powder and diesel, was proposed in an attempt to break the bottleneck. Flotation experiments with common diesel and this novel collector were performed respectively, and FTIR , XPS , and SEM-EDX were employed to analyze the collector action mechanism. Flotation results revealed that the novel collector could significantly improve the residual carbon recovery; test results demonstrated that the novel collector could increase the hydrophobic functional group content on the fine slag surface, and the hydrophobic powders in this novel collector mainly appeared at the pore openings of the flotation concentrate. The essence of the mechanism is that the hydrophobic powders play a dual role of blocking pores and providing adsorption sites, thus facilitating the spreading of diesel on the carbon surface and promoting its floatability. The study can provide creative ideas for the efficient disposal of coal gasification waste.
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APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Zhitao Yuan,Yuankai Xu,Qingyou Meng,Yanbin Tang,Li Yu
The structure–activity relationship of alcohol in the synergism between benzohydroxamic acid (BHA) and alcohol as mixed collectors was investigated. Microflotation results showed that an appropriate molecular structure of alcohol was advantageous for ilmenite flotation with BHA/alcohol collectors. In the optimal BHA/1-octanol (1-OCT) and BHA/2-octanol (2-OCT) systems, the recoveries of ilmenite were 63.81% and 66.37%, while those of titanaugite were only 12.19% and 13.01%, respectively. The positive synergism was observed in BHA/alcohol systems at the gas–liquid intersurface and liquid phase. Mixed micelles were formed through hydrogen bonding and van der Waals interactions between BHA and three octanol molecules. At the solid–liquid intersurface, BHA/1-OCT contributed to a significant difference in the surface hydrophobicity between ilmenite and titanaugite. Ilmenite exhibited the strongest surface hydrophobicity in BHA/2-OCT system. As detected by X-ray photoelectron spectroscopy (XPS) measurements and molecular dynamic (MD) simulation, BHA could selectively react with Fe and Pb active sites of ilmenite surfaces through chemisorptions, then 2-OCT co-adsorbed onto the ilmenite surface through hydrogen bonding and van der Waals interactions, increasing the hydrophobicity layer. However, BHA/2-OCT weakly adsorbed onto titanaugite surfaces. The synergism of BHA/alcohol at the gas–liquid-solid intersurface of ilmenite enlarged its hydrophobicity, resulting in the floatability difference between ilmenite and titanaugite.
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FUEL
·
2023
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IF 7.4
Jianqiang Yin,Hongzheng Zhu,Liang Yuan,Bingyou Jiang,Gaochao Pan,Wenliang Zhu,Qinghui Shi
Using the high-speed motion acquisition system, we studied the adhesion ability and wetting ability of coal dust under the effect of four octanol solutions. The adhesion ability followed the order: 2-Octanol > 4-Octanol > 1-Octanol > 3-Octanol. The wrap angle of coal dust on the octanol surface exhibited an increasing trend with the rise in coal proportion of dust. The observed behavior was substantiated by the interaction force, ascertained through molecular dynamic simulations. The interaction force between coal dust and 3-Octanol was the smallest leading to the weakest adhesion ability by the 3-Octanol solution. The contact angle of octanol solution droplet at the coal dust surface under the same octanol concentration was investigated to follow the order: 2-Octanol > 4-Octanol > 1-Octanol > 3-Octanol. The wetting velocity decreased as the coal proportion of dust increased. The wetting ability followed the order: 2-Octanol < 4-Octanol < 1-Octanol < 3-Octanol. The surface energy of dust increased as the coal proportion decreased. The dedusting efficient under the effect of octanols depended on the difference in surface energy between the coal dust and the octanol solution. The greater the Δ γ (difference between the surface energy of the dust and solution), the weaker the adhesion ability, and the stronger the wetting ability. The findings of our study can offer valuable insights for the development of dedusting reagent design.
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POLYMER COMPOSITES
·
2023
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IF 5.2
Xudong Li,Junwei Wang,Xiaoyun Li,Qifeng Li,Maoqing Kang
Microcapsules with polydopamine composite shell layer were successfully synthesized by functionalizing silica-modified microcapsules containing isophorone diisocyanate. The components and micromorphology of silica-modified microcapsules at different reaction periods were studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy. The structure of different microcapsules was characterized by FTIR, 1 H nuclear magnetic resonance and x-ray photoelectron spectroscopy. The mechanical performances of different microcapsules were analyzed by nanoindentation technique. The compatibility and self-healing efficiency of different microcapsules with the substrate were also investigated by the tensile tests. The results showed that the density of the silica-modified microcapsule shell gradually increased and the mechanical performances were enhanced with the silica source. The hardness and elastic modulus of silica-modified microcapsules in suitable core fraction (76.5 wt%) were 139.9 MPa and 2.2 GPa, which are 2.3 times and 4.8 times higher than those of untreated microcapsules, respectively. The functionalized modified microcapsules had excellent compatibility with the elastomeric substrate (PU-PPG2000). At the same time, the self-healing efficiency of the functionalized modified microcapsules in PU-PPG2000 was 69.8%, which was 48.9% higher than that of the untreated microcapsules prepared under the same conditions. Silicon modification improved the density of microcapsules, enhancing their mechanical strength. At the same time, functionalization modification improved the interfacial bonding strength of microcapsules, further improving the compatibility with the polymer matrix. Highlights Microcapsules with different silicon sources are characterized. Microcapsules are functionalized with polydopamine. Individual microcapsules are tested for mechanical strength by nanoindentation. The compatibility of the functionalized microcapsules is excellent. The self-healing efficiency of modified microcapsules is greater than 70%.
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