ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 1
·363-371
·
IF 2.76
Jin Jingnan,Yao Jun,Liu Wenjuan,Zhang Qingye,Liu Jianli
In this study, a gram-positive fluoranthene-degrading bacterial strain was isolated from crude oil in Dagang Oilfield and identified as Microbacterium paraoxydans JPM1 by the analysis of 16S rDNA sequence. After 25 days of incubation, the strain JPM1 could degrade 91.78 % of the initial amount of fluoranthene. Moreover, four metabolites 9-fluorenone-1-carboxylic acid, 9-fluorenone, phthalic acid, and benzoic acid were detected in the culture solution. The gene sequence encoding the aromatic-ring-hydroxylating dioxygenase was amplified in the strain JPM1 by PCR. Based on the translated protein sequence, a homology modeling method was applied to build the crystal structure of dioxygenase. Subsequently, the interaction mechanism between fluoranthene and the active site of dioxygenase was simulated and analyzed by molecular docking. Consequently, a feasible degrading pathway of fluoranthene in the strain JPM1 was proposed based on the metabolites and the interaction analyses. Additionally, the thermodynamic analysis showed that the strain JPM1 had high tolerance for fluoranthene, and the influence of fluoranthene for the bacterial growth activity was negligible under 100 to 400 mg L −1 concentrations. Taken together, this study indicates that the strain JPM1 has high potential for further study in bioremediation of polycyclic aromatic hydrocarbon (PAH)-contaminated sites.
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Polymer Chemistry
·
2017
·Vol. 8
·期 30
·4403-4413
·
IF 5.375
Bo Hu,Luyang Miao,Yang Bai,Changli Lü
A series of fluorenyl-containing polysulfone-based crosslinked anion exchange membranes with high conductivity and excellent stability were fabricated via click chemistry. Azide groups were firstly introduced into the side chains of fluorenyl-containing polysulfone via the quaternization reaction, and then the designed bifunctional crosslinking agents containing alkyne groups with different lengths and polarities (hydrophilicity) were used to construct the crosslinked structure via the click reaction between azides and alkynes. The degree of crosslinking of membranes can be adjusted by controlling the content of the crosslinking agent. The proper crosslinking of AEMs in this work can tighten the internal packing structure of membranes, which could not only enhance the mechanical strength of AEMs but also improve the fuel permeability, alkaline resistance and oxidative stability of membranes. The water uptake and swelling ratio of the crosslinked AEMs were also improved with the increase of polarity and length of crosslinking agents. The hydroxide conductivity of d-CPFSU-1 was not decreased by crosslinking rather it increased to 193.95 mS cm−1 at 80 °C due to the formation of a uniform nano-micro phase separation structure. Our study showed that AEMs with enhanced performance can be achieved by the design of crosslinking within the control of the micro-phase structure.
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Advanced Energy Materials
·
2024
·Vol. 14
·期 26
·2401197
·
IF 24.4
Mingli Xu,Chen Wu,Lang Ye,Yuanteng Zhang,Chenyi Zhang,Jieming Hu,Ran Tan,Dong Gu,Xuanze Wang,Olivier Fontaine,Chun Zhan,Lin Zhuang,Xinping Ai,Jiangfeng Qian
Degraded LiCoO 2 cathode from retired Li-ion batteries is urgently required to be recycled in a greener way for economic and environmental considerations. The coarse metallurgy technologies for Li/Co extraction with massive CO 2 emission and energy consumption cannot satisfy the requirements of carbon neutralization. Herein, it is proposed that direct regeneration of degraded LiCoO 2 cathode could be realized via 9-fluorenone-mediated Li supplementation and follow-up structural restoration. The 9-fluorenone-lithium reagent is elaborately selected to compensate for the missing Li + into lattice with targeted stoichiometry owing to its compatible redox potential of 1.95 V versus Li + /Li, which is located just between the reversible intercalation (3.8 V) and irreversible conversion (1.2 V) potentials of LiCoO 2 electrode. Then, thermal energy-driven structure reorganization enables Li/Co atoms to occupy the right sites, accomplishing desirable structure healing within a short annealing time of 4 h. The regenerated LiCoO 2 cathode exhibits comparable Li-storage capability to commercial LiCoO 2 , benefiting from the non-destructive direct regeneration technology. In addition, the regeneration route is regarded as environmentally (0.13 kg CO 2 kg −1 cell) and economically (10.07 $ kg −1 cell) superior to conventional recycling routes based on life-cycle analysis. The precise surgery on spent LiCoO 2 cathode provides a promising solution for the forthcoming retirement rush of Li-ion batteries.
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JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
En Ning Hu,Chen Xiao Lin,Fang Hua Liu,Xiu Qin Wang,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To resolve the excessive swelling and undesirable alkaline stability of densely functionalized type anion exchange membranes (AEMs) and to obtain high performance AEMs, quaternary ammonium-functionalized poly(arylene ether nitrile) (QPAEN) AEMs with dense flexible ionic side chain are prepared via nucleophilic substitution polycondensation , demethylation reaction and Williamson reaction. The densely pendent flexible long side chains with QA groups at the end provide a high conductivity and the introduced strong polar nitrile groups result in lower water uptake, excellent dimensional stability and strong alkali resistance of the AEMs. The QPAEN membrane with IEC of 1.78 meq g −1 exhibits the highest hydroxide conductivity of 116.0 mS cm −1 at 80 °C. The high conductivity is attributed to the well-developed hydrophilic/hydrophobic phase separated morphology that constructs efficient ion conducting pathways in the membranes. High retention of hydroxide conductivity (80.2%) and ionic exchange capacity (IEC) (86.0%) was observed for the QPAEN-0.4 membrane in the degradation test in a 2 M aqueous KOH solution for 480 h. Moreover, the single cell performance of the as-prepared AEMs was greatly enhanced and a high peak power density of 251.3 mW cm −2 at 60 °C was observed.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Lixia Li,Xiuqi Li,Feiyue Li,Xiang Zhen,Mingdong Dong,Jinxing Long,Xiaobing Wang,Zhiyong Jiang
Harnessing photocatalyzed hydrogen atom transfer (HAT) for the precise activation of C–H/O–H bonds is a pivotal yet challenging strategy to selectively drive oxidative C–C bond scission in renewable lignin, yielding value-added chemicals with exceptional selectivity. Herein, we present a metal-free photochemical strategy that enables selective C–C bond scission in lignin via a unique synergistic HAT pathway driven by triplet-excited 2-ethylanthraquinone (EAQ*) and hydroxyl radicals ( • OH) generated in situ from EAQH 2 and O 2 . Under simulated natural conditions, this process achieves a benzaldehyde yield of 146.6 mol% from a lignin-derived phenolic dimer. Mechanistic investigations reveal that preferential activation of the C α -OH in lignin facilitates a tandem HAT process, forming alkoxy radical intermediates that undergo β –scission to produce benzaldehyde, as corroborated by extensive control reactions and density functional theory calculations. Furthermore, this straightforward protocol efficiently cleaves the C–C bonds of technical kraft lignins, providing a rapid, scalable, and metal-free protocol for lignin valorization under mild conditions.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Qidong Yu,Yiding Li,Wenmin Zhang,Xueting Cui,Shiye Xie,Lan Zhang
Monitoring trace oxygenated polycyclic aromatic hydrocarbons (O-PAHs) in tea infusions is crucial, as long-term consumption of O-PAHs-contaminated tea can harm health. In this work, covalent organic framework (COF) TpBD-(OH) 2 coating was fabricated for solid-phase microextraction (SPME) of O-PAHs. The coating contains abundant benzene rings and hydrogen bonding sites (oxygen and nitrogen groups). Density functional theory calculations, electrostatic potential distribution and X-ray photoelectron spectroscopy analysis indicated the COF efficiently adsorbs O-PAHs via van der Waals force, hydrogen bonding, electrostatic force, size matching, and π-π interaction. Under the best SPME conditions, a method for detecting O-PAHs in tea infusions was developed using gas chromatography-tandem mass spectrometry (GC–MS/MS). The method possessed low limit of detection (0.5–1.0 ng L −1 ), wide linearity (2.0–1000.0 ng L −1 ) and satisfactory recoveries (82.5 %–117.5 %). Furthermore, the method was used to study the impacts of different roasting methods on O-PAHs contamination, and results showed carbon roasting posed a higher risk.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jiawang Fu,Yang Yang,Qiuchen Du,Bailing Liu,Huiying Sun,Bo Hu,Zhongmin Su
This study presents an interface engineering strategy for the fabrication of high-performance proton exchange membranes. The strategy utilizes isatin-derived polymer (PIB)-anchored Keggin-type phosphotungstic acid (H3PW12O40, abbreviated as PW) as functional fillers, which are integrated into a sulfonated polyaryletherketone (named as SPAEK) matrix to synergistically enhance the overall performance of the resulting membrane (denoted as PISm/PW-x, where m represents the mass ratio of PIB to SPAEK and x represents the mass fraction of PW in the hybrid matrix). The poly(1,2-diphenylethane)-isatin (named as PIB), synthesized via superacid catalysis, forms a strong ionic cross-linking (−NH···-SO3H) with SPAEK, achieving outstanding mechanical strength (46.1 MPa) and dimensional stability (6.25% swelling ratio at 80 °C), while the uniformly dispersed PW clusters act as bridges to construct a continuous hydrogen-bonding network, enhancing the proton conductivity (0.192 S cm–1 at 80 °C) by 2.15 times compared to the pristine membrane in water solution. The optimized PIS1/PW-8 membrane demonstrates exceptional overall performance, characterized by ultra-restricted methanol permeability (1.82 × 10–8 cm2 s–1), superior oxidative stability (99.4% weight retention in Fenton’s test), and outstanding operational durability (sustained conductivity over 100 h at 80 °C). This performance is attributed to a well-defined microphase-separated morphology featuring approximately 2.0–3.0 nm hydrophilic domains and highly efficient proton hopping pathways. This molecular-level engineering of organic–inorganic interfaces offers a paradigm for advanced fuel cell membranes, simultaneously addressing the long-standing trade-off between conductivity and mechanical stability in polyelectrolyte materials.
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POLYMER
·
2025
·
IF 4.5
Junji Wei,Zeyue Zhang,Zexing Zhang,Runlin Lu,Jinbiao Pang,Shifeng Yuan,Liang Fang,Li Duan,Jian Liu
For decades, high-performance epoxy resins have been pivotal in advancing high-temperature electronic materials. Conventional epoxy resins tend to soften and deform under high-temperature conditions, which compromises their structural stability and fails to meet the stringent thermal reliability requirements of high-temperature processes and equipment. Regarding this, this study presented two new kinds of fluorene-based epoxy monomers bisphenol fluorene epoxy resin (BFEP), isopropyl bisphenol fluorene epoxy resin (IBFEP) and a novel curing agent (1,3-bis(4-aminophenyl) adamantane, AMA) derived from adamantane. The two monomers were cured with two hardeners, 4,4-diaminodiphenyl sulfone (DDS) and AMA, respectively. The DDS cured resins showed high glass transition temperature (BFEP/DDS, 236 °C; IBFEP/DDS, 209 °C), excellent storage modulus, good thermal stability ( T d5% >395 °C) and dimensional stability, low water absorption and good adhesion. However, the dielectric constant (κ) of those two resins were relatively high, e.g. 4.6 was for BFEP/DDS, 4.23 was for IBFEP/DDS at 10 MHz. Compared with DDS system, both resins exhibited a lower glass transition temperature ( T g ) after cured by AMA. However, the latters also possessed a notably high storage modulus at room temperature (RT) (BFEP/AMA, 4420 MPa; IBFEP/AMA, 4630 MPa), lower dielectric constant (BFEP/AMA, 4.05; IBFEP/AMA, 3.74 at 10 MHz), better adhesion and thermal conductivity. In summary, the two kinds of fluorene-based epoxy resins cured with different curing agents exhibited different performance characteristics. The performance of AMA cured epoxy resin exhibited more balanced behaviors due to its excellent rigid and hollow structure, which could be suitable for high- T g PCB substrate materials.
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Chemistry-An Asian Journal
·
2019
·Vol. 14
·期 19
·3350-3356
·
IF 3.698
Dongkun Yu,Hongyu Mou,Xinhui Zhao,Yaqing Wang,Tiancheng Mu
Graphical Eutectic molecular liquids based on hydrogen bonding and π–π interaction were formed and used for exfoliating two-dimensional materials and recycling polymers. Eutectic molecular liquids (EMLs) based on hydrogen-bonding interaction and π–π stacking were prepared. We found that the thermodynamic properties like initial decomposition temperature and glass transition temperature of EMLs are mainly dominated by the hydrogen bond donor, which is beneficial for designing and preparing new EMLs. These new liquid systems could be applied in the field of environmental and material science.
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Journal of the Mechanical Behavior of Biomedical Materials
·
2025
·
IF 3.5
Yinan Sun,Lihua Hong,Lin Sun,Chengji Zhao
In dentistry, the use of bisphenol A glycidyl methacrylate (Bis-GMA) is being questioned since bisphenol A is regarded as an endocrine disruptor. As alternative candidates to Bis-GMA, bio-based dental resins face the crucial challenge of low mechanical strength and high water sorption. In this study, a novel guaiacol-based dimethacrylate containing fluorenyl cardo-structure was developed to effectively improve the hydrophobicity, enhance the mechanical properties, and reduce the polymerization shrinkage of bio-based dental restorative resins. Therefore, 9, 9-bis(3-methoxy-4-glycerolate methacrylate)fluorene (BMHF-GMA) was synthesized from a new guaiacol-based bisphenol, 9, 9-bis(3-methoxy-4-phenol)fluorene (BMHF), which is a lower estrogenic activity bisphenol monomer than commercial bisphenols from the results of cell proliferation test. The experimental dental resin (5 MHMA5T) was prepared containing BMHF-GMA and triethylene glycol dimethacrylate in a 1:1 ratio. The control group (5B5T) replaced BMHF-GMA completely with Bis-GMA. Evaluation of both dental resins revealed that 5 MHMA5T possessed comparable double bond conversion (>50 % in 20 s), better volumetric polymerization shrinkage (7.19 ± 0.09 %), shrinkage stress (0.92 ± 0.01 MPa in 1200 s), water sorption (39.9 ± 0.52 μg mm −3 ), water solubility (0.99 ± 0.04 μg mm −3 ) and lower cytotoxicity compared with 5B5T. 5 MHMA5T had superior mechanical properties (flexural strength: 122.30 ± 5.00 MPa; flexural modulus: 3.49 ± 0.02 GPa; Vickers hardness number: 25.21 ± 0.56 HV). Especially, after water immersion, it still maintained adequate mechanical properties (flexural strength: 97.34 ± 5.00 MPa; flexural modulus: 2.92 ± 0.02 GPa; Vickers hardness number: 19.33 ± 0.61 HV). Therefore, the new dimethacrylate BMHF-GMA shows great potential in complex and wet oral environments and offers a promising alternative to Bis-GMA in dental restorative resins.
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