APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Gankai Huang,Yubao Wang,Yan Du,Qunhua Long,Kungang Chai
Adsorption-based separation of 2-phenylethanol (2-PE) and 1-phenylethanol (1-PE) is crucial yet challenging in the petrochemical industry. In this study, we report that an ultra-micropore aluminum-based metal–organic framework (Al-MOF) (i.e., CAU-23) exhibits higher 2-PE/1-PE selectivity (6.12) and 2-PE adsorption capacity (2.52 mmol g −1 ) in liquid phase compared to its pseudo-isostructural analogue of Al-MOFs, MIL-160 and MOF-303 at 293 K. The micropore diffusion model was employed to give the best fit to the adsorption kinetics of the CAU-23 with a rate achieved higher than MIL-160 and MOF-303. Computational analysis confirmed that 2-PE preferential adsorption stems from CAU-23′s well-matched pore geometry which enables efficient molecular confinement. In combination of inspecting the static adsorption properties of 2-PE and 1-PE onto CAU-23, we found that the superior affinity of CAU-23 toward 2-PE over 1-PE originates from entropy and enthalpy effect. The remarkable 2-PE/1-PE separation capability of CAU-23 was confirmed through breakthrough curve analysis (separation factor ≈ 4). As the first Al-MOF developed for 2-PE/1-PE separation, CAU-23 offers valuable insights into the design of advanced 2-PE-selective adsorbents.
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Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Zhiwei Shi,Xinyu Jia,Hao Chen,Yagang Zhang,Xinfu He,Anning Zhou,Mingyi Wang
Aromatics and hydrogenated aromatics constitute the primary constituents of the recycled solvent utilized in coal liquefaction. However, the presence of hydrogenated aromatics complicates the assessment of the effects of aromatic compounds during the coal liquefaction process. To eliminate the effect of hydrogenated aromatics, solvent-free experiments and experiments with specific polycyclic aromatic compounds (pyrene, fluoranthene, phenanthrene, and naphthalene) were conducted, along with utilizing density functional theory calculations. Results show that the shuttle role of naphthalene is influenced by catalyst activity. In the presence of a low-active catalyst, naphthalene acts as a shuttle agent facilitating indirect hydrogen transfer. However, with a high-active catalyst, direct transfer of hydrogen from H 2 to pyrolysis radicals occurs without involving naphthalene as an intermediary. Polycyclic aromatic compounds exhibit higher hydrogen shuttle ability (pyrene > fluoranthene > phenanthrene > naphthalene). The high hydrogen shuttle ability can be attributed to the higher reactivity in hydrogenation and lower energy barriers for hydrogen transfer. A nonradical hydrogen transfer pathway has been proposed, promoting cleavage of strong covalent bonds and enhancing the yield of asphaltene and preasphaltene. Additionally, π–π inter actions between polycyclic aromatic compounds and pyrolysis radicals have been evaluated. The interactions contribute positively to radical stability. Substances characterized by a greater number of aromatic rings display a more pronounced stabilizing effect on free radicals.
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FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Haoxin Cui,Yazhou Ji,Yawei Chang,Zhenting Yu,Fan Wei,Bowei Zhang,Yingshuang Lu,Yan Zhang,Ruican Wang,Shuo Wang
Protein is the second most abundant component in chestnut dry matters. In this study, chestnut proteins were extracted with three different methods, i.e., alkaline extraction-isoelectric precipitation (AE-IP, pH 8.0, 9.0, and 10.0), alkaline extraction-ammonium sulfate (AS) precipitation (AE-ASP, AS saturation rate 30%, 65%, and 100%), and salt extraction (SE, NaCl concentration 0.5 M, 1.0 M, and 1.5 M), to understand how extraction conditions affect the yield and properties of chestnut protein preparations. Physicochemical (composition, color, particle size, surface hydrophobicity) and functional properties (solubility, water/oil holding, emulsifying, foaming capacities), along with the in vitro digestibility of samples exhibited significant variation across the extraction methods. For AE-IP and SE methods, protein yields ranged from 35.1% to 43.5%, while the AE-ASP method yielded between 13.2% and 49.8%, largely depending on the (NH 4 ) 2 SO 4 concentration. Purity of protein preparations varied between 82.4 and 93.3%, with the samples extracted with the SE method associated with higher levels of phenolic impurities. Ultra-centrifugal analysis revealed that for the native chestnut proteins extracted with all AE-IP and SE conditions as well as with 100% (NH 4 ) 2 SO 4 , the fraction of 11S was the dominant component, which was barely obtained with lower (NH 4 ) 2 SO 4 concentrations. In terms of functional properties, proteins from AE-IP method exhibited relatively higher water/oil holding and emulsifying capacities, while SE contributed to higher protein solubility but lower in vitro digestibility. Proteins extracted with 100% saturated (NH 4 ) 2 SO 4 concentration showed comparable functional properties to AE-IP proteins. This work provides theoretical insights into the potential use of chestnut protein as a novel plant-based protein ingredient.
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LIQUID CRYSTALS
·
2025
·
IF 2.2
Mi-Yi Yu,Wen Xin,Di Ke,Ji-Feng Gao,Shuai-Yin Ma,Xiao-Zhi He
Fluorescent liquid crystal polymers (PFL1-PFL10) with temperature dependent of selective reflectance and fluorescence properties were obtained by graft copolymerisation of naphthalimide fluorescent monomers (FA and FB) containing different halogen atoms with cholesterol monomer (MA) and monomer containing cyanide (MB) onto polysiloxane chains. Among them, PFL2-PFL7 are polymers containing FA and FB fluorescent monomers, while PFL1 and PFL8-PFL10 are polymers containing only FA or FB fluorescent monomer; detailed comparative analysis was conducted on their liquid crystal and fluorescence performance. The structures of monomers and polymers were characterised using infrared spectroscopy and nuclear magnetic resonance, and the synthesised monomers and polymers conform to molecular design. By analysing the liquid crystal and thermal properties of the polymer through POM, DSC, XRD and TGA, it was demonstrated that the polymers are cholesteric liquid crystal polymer with excellent performance. The fluorescence properties of the polymer were analysed by fluorescence spectroscopy, and it was found that fluorescence quenching only occurs when the total content of FA and FB exceeds 20%. Simultaneously, the relationship between fluorescence performance and temperature was studied, and beneficial conclusions were drawn.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Min Xue,Junjie Fu,Furui Shang,Gang Wang,Lei Zhang,Hongjuan Lv
Two acylhydrazone derivatives with long-chain alkyl groups, DHS (salicylaldehyde-based) and DHN (naphthaldehyde-based), were designed and synthesized. Both compounds exhibited supramolecular gelation abilities, and DHN was a supergelator for benzene. The single-crystal X-ray diffraction analysis revealed that DHS forms dimers via intermolecular hydrogen bonding. The powder X-ray diffraction (PXRD) studies showed that DHS adopts different repeating units in benzene and propanol gels. Based on the results obtained from single-crystal structure, PXRD, and mass spectrometry measurements, a plausible self-assembly evolution of gelator molecules was proposed. This work demonstrated that the single-crystal structures could provide critical insights into the molecular packing of the gel state. The fluorescence spectra and in situ monitoring of the gelation process confirmed that both DHS and DHN possess typical aggregation-induced emission (AIE). Notably, DHS functions as a highly sensitive optical chemosensor for Al3+, achieving quantitative detection with a remarkable minimum detection limit of 4.79 nM.
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MOLECULES
·
2024
·Vol. 29
·期 11
·2708
·
IF 4.2
Yunteng Chen,Chunxian Hong,Qiang Xu,Haihong Zheng,Chao Wang,Hongshun Lu,Shuai Zhang,Mingming Du,Ganning Zeng
In this study, carbon-quantum-dot (CQD)-decorated TiO2was prepared using an ultrasonic doping method and applied in the photocatalytic degradation of naphthalene under sunlight irradiation. The CQDs were synthesized from a typical macroalgae via diluted sulfuric acid pretreatment and hydrothermal synthesis using an optimal design, i.e., 3 wt% and 200 °C, respectively. The CQD/TiO2composite remarkably enhanced the photocatalytic activity. The degradation of naphthalene under a visible light environment indicated that there is a synergistic mechanism between the CQDs and TiO2, in which the generation of reactive oxygen species is significantly triggered; in addition, the N that originated from the macroalgae accelerated the photocatalytic efficiency. Kinetic analysis showed that the photocatalytic behavior of the CQD/TiO2composite followed a pseudo-first-order equation. Consequently, our combined experimental approach not only provides a facile pretreatment process for bio-CQDs synthesis, but also delivers a suitable TiO2photocatalyst for the visible environment along with critical insights into the development of harmful macroalgae resources.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Han Gao,Shang Gao,Lei Wang,Zhen Song,Xiaolei Qu,Minli Wang,Tao Long,Jinzhong Wan
Thermal treatment is a commonly applied soil remediation technique that can also change the properties of soil. However, few studies looked into the transformation and mechanism of soil organic matter (SOM) at the molecular level when contaminated soil undergoes thermal remediation. Herein, FT-ICR MS, pyrolysis gas chromatography mass spectrometry (Py-GC–MS), and size exclusion chromatography-diode array detector-fluorescence detector-organic carbon detector (SEC-DAD-FLD-OCD) were used to unveil the molecular transformation mechanism of SOM under 100 °C and 400 °C treatments. The macromolecules transformed to humic and fulvic components after 400 °C treatment, while few transformations occurred after 100 °C treatment. The molecules decreased with the increase in temperature. After 400 °C treatment, over 99 % of the molecules were newly produced, which were mainly aromatic (66 %) and lignin-like (19 %) components. After 100 °C treatment, most of the molecules (73.6 %) were reserved. The unsaturation and aromatic structures of SOM increased significantly after the 400 °C treatment, while the changes were relatively minor after the 100 °C treatment. The fracture of the carbon skeleton, cyclization, and H abstraction reactions were the main mechanisms for the molecular transformation of SOM during 400 °C treatment, while volatilization was the main transformation scheme during 100 °C. Statistical results of pyrolysates show the increase of aromatic components, and the molecular markers reflected the increase of condensed organic carbon and the decrease of phenols, alkene components during 400 °C treatment. The sorption of PAHs for soil decreased after treatment, owing to the loss and transformation of SOM. This study advances the mechanistic understanding of transformation in SOM molecular signatures during thermal treatment.
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TALANTA
·
2014
·
IF 3.511
Man Wang,Shihai Cui,Xiaodi Yang,Wentao Bi
An easy preparation of g-C 3 N 4 /Fe 3 O 4 nanocomposites by chemical co-precipitation has been demonstrated. The as-prepared materials were characterized by X-ray diffraction, transmission electron microscopy , Fourier transform infrared spectroscopy and thermogravimetric analysis . The high affinity of g-C 3 N 4 toward polycyclic aromatic hydrocarbons and the magnetic behavior of Fe 3 O 4 were combined to provide an efficient and simple magnetic solid phase extraction (MSPE). The adsorption and desorption of polycyclic aromatic hydrocarbons on g-C 3 N 4 /Fe 3 O 4 were examined. Different factors affecting the magnetic solid phase extraction of polycyclic aromatic hydrocarbons were assessed in terms of adsorption, desorption, and recovery. Under the optimized conditions, the proposed method showed good limits of detection (LOD, S/N=3) in the range of 0.05–0.1 ng mL −1 and precision in the range of 1.8–5.3% (RSDs, n =3). This method was also successfully applied to the analysis of real water samples; good spiked recoveries over the range of 80.0–99.8% were obtained.
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Food & Function
·
2020
·Vol. 12
·期 4
·1626-1638
·
IF 4.171
Xu-Hui Huang,Yu-Ying Zhang,Ming Zhu,Da-Yong Zhou,Ming Du,Bei-Wei Zhu,Xiu-Ping Dong,Ian Fisk,Lei Qin
Clam is a kind of nutritious, delicious and economical aquatic food around the world and is famous for its unique aroma. Instrumental analysis, sensory analysis, and comprehensive statistical analysis were performed to explain the relationship between aroma and odorants in clam soup. Six extraction methods combined with GC-MS and sniffing were utilized to obtain the aroma fingerprints of clam soup and to analyze the correlation with aroma perception. Solvent extraction methods were more effective than headspace extraction methods for the volatiles of clam soup. SAFE was the best method to obtain the most comprehensive information of volatiles of clam soup. The sequence of a combination of different extraction methods and SAFE would also affect the results of volatiles extracted from clam soup. Volatiles extracted via SDE, P&T, and SPME would add further information to the result of SAFE. A total of 119 volatile compounds were identified from clam soup by summarising the results of different extraction methods. The significant effect of 14 key odorants in clam soup on aroma perception was verified by aroma recombination and odorant omission tests. A neural network diagram of the aroma profile was designed to visualize the information of odor perception. Furthermore, the results would be beneficial for aroma research studies of aquatic food and the processing of clam products.
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TALANTA
·
2020
·
IF 5.339
Xin-Qiao He,Yuan-Yuan Cui,Cheng-Xiong Yang
Development of efficient adsorbents for the enrichment of trace contaminants from complex matrix still remains great challenge and interest. Here we report the decoration of amino microporous organic network on zeolitic imidazolate framework (ZIF)-67 derived nitrogen-doped carbon (Co@NC-MON-2NH 2 ) for efficient magnetic solid phase extraction (MSPE) of plant growth regulators (PGRs) from vegetables. The ZIF-67 was calcined to produce Co and N co-doped porous carbon (Co@NC), serving as the magnetic separation module and the core for in-situ growth of MON-2NH 2 shell. The Co@NC-MON-2NH 2 owned large surface area, good magnetic property and stability, giving high affinity to PGRs via multiple extraction mechanisms such as hydrogen bonding , π-π and hydrophobic interactions. Under optimal conditions, the Co@NC-MON-2NH 2 based MSPE-HPLC-UV method gave wide linear range, good precisions, large enrichment factors, less adsorbent consumption and low limit of detections for the studied PGRs. The proposed MSPE-HPLC-UV method was also successfully applied to monitor the trace PGRs in diverse vegetables. These results not only revealed the promise of Co@NC-MON-2NH 2 in extraction and adsorption of environmental contaminants from complex matrix, but also provided a new way to fabricate magnetic functionalized MONs in environmental science.
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MARINE POLLUTION BULLETIN
·
2025
·
IF 4.9
Ruicong Gao,Jiaqi Lu,Zhixuan Wei,Hao Xu,Siyuan Jing,Minghuo Wu
PAHs, a group of persistent organic pollutants with significant carcinogenic and mutagenic effects, are widely distributed in the environment and can accumulate in sediments, posing potential threats to mangrove ecosystems and human health. This study is one of the most recent studies that presents an analysis of the vertical contamination characteristics of PAHs in mangrove sediments down to a depth of 80 cm, utilizing a combination of solid-phase extraction and gas chromatography–mass spectrometry. The results showed that the mean value of PAHs was 258.82 ng/g (range from 226.41 to 320.07 ng/g) in the studied mangrove areas (Beihai City, Guangxi). The results indicated a decline in PAH concentrations with increasing sediment depth, with values of 259.3 ng/g in surface sediments (0–10 cm), 240.9 ng/g in intermediate sediments (30–40 cm), and 241.1 ng/g in deeper sediments (60–70 cm). This suggests that PAHs not only remain in the surface layer of the sediment, as in previous studies, but also migrate vertically within the sediment. Based on the results, the potential ecological risks of PAHs were also evaluated by the ERL/ERM model. After environmental risk assessment, it was found that among the six PAHs studied, the contents of all except acenaphthene were lower than the ERL, indicating a low ecological risk. This study elucidates the vertical distribution of PAHs in mangrove sediments, offering crucial data for ecological risk assessment and establishing a foundation for future research on PAH transport mechanisms and their ecological impacts, thereby informing environmental management strategies.
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Fuels
·
2025
·Vol. 6
·期 4
·89
·
IF 2.8
Zhibing Shen,Ruiyuan Tang,Shengrong Liang,Juntao Zhang,Leyuan Li,Shangli Zhang
The conversion of polycyclic aromatic hydrocarbons (PAHs) to monocyclic aromatic hydrocarbons holds significant importance in the petrochemical and coal chemical industries, as it enables the production of high-value-added chemicals. In this study, we investigated the methane-assisted hydroconversion of PAHs to monocyclic aromatic hydrocarbons with methyl side chains over Zn-based catalysts from Hβ zeolites treated with citric acid (CA) at different concentrations. The CA-modified Hβ catalysts were characterized using X-ray diffraction (XRD), N2adsorption–desorption, pyridine–Fourier transform infrared spectroscopy (Py-FTIR), and ammonia temperature-programmed desorption (NH3-TPD). The results show that low CA concentrations facilitate the removal of amorphous aluminum from the zeolite framework, thereby increasing the specific surface area, pore volume, and pore diameter of the Zn/Hβ catalyst, as well as improving its Lewis/Brønsted (L/B) acid ratio. In contrast, excessive CA treatment causes the undesirable removal of framework aluminum and leads to structural collapse in the mesoporous regions formed at the interfaces between certain crystal aggregates. This, in turn, has a negative impact on the catalyst’s specific surface area, pore volume, pore size distribution, total acidity, and L/B ratio. Experimental data further indicate that the optimal Zn/Hβ catalyst, prepared using Hβ treated with 0.08 M CA, achieves a naphthalene conversion rate of up to 99% and a benzene–toluene–xylene (BTX) selectivity of 60% in the liquid product over a 10 h reaction period. These findings confirm that CA treatment not only enhances the catalytic activity of Zn/Hβ but also significantly improves its operational stability. This work provides new insights into the rational design of catalysts for the efficient conversion of PAHs to monocyclic aromatic hydrocarbons and the utilization of methane resources.
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