Polymers
·
2022
·Vol. 15
·期 1
·32
·
IF 4.967
Xiangyao Li,Jie Zhang,Chengchao Liu,Wenmin Mu,Zhe Kong,Yan Li,Zhongwei Wang,Qing Yu,Guiqing Cheng,Long Chen
Polyolefin suffers from degradation during processing and application. To prolong the service life, antioxidants are needed in the packing formula of polyolefin products. The usage of natural antioxidants could avoid potential health hazards aroused by synthetic ones. Pine needles have long lives and hardly rot, suggesting their high resistance to degradation. To provide a new candidate of natural antioxidants and add more value to pine needles, pine needle extracts (PNE) were investigated as the antioxidant of linear low-density polyethylene (LLDPE). PNE-modified LLDPE (PE-PNE) exhibited much better short-term and long-term aging resistance than pure LLDPE (PE): Oxidation induction time (OIT) of PE-PNE was 52 times higher than that of PE, and the increments of carbonyl index (CI) of PE-PNE-1st samples placed under daylight and in the dark were approximately 75% and 63% of PE under the same conditions. It could be attributed to the attractive antioxidant capacity of PNE (IC50of DPPH radical scavenging was 115 μg/mL). In addition, the PE-PNE sample showed high processing stability and maintenance of the mechanical property during multiple extrusions: only a 0.2 g/10 min decrease in melting flow rate was found after five extrusions; the tensile strength and elongation at break were almost unchanged. All results reveal that pine needle extracts could play a role in LLDPE stabilization. Moreover, as pine needles are mainly considered a kind of waste, the present study would benefit the budget-reducing polyolefin industry.Keywords:natural;antioxidant;polyethylene;application
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Ning Li,Wenjing Meng,Lin Chang,Zhaolei Qu,Bing Liu,Kang Liu,Yuemei Zhang,Lin Huang,Hui Sun
Forest succession induced by pine wilt disease can result in changes in vegetation, thereby reducing timber production and impacting the input of belowground litter. Litter decomposition plays a crucial role in nutrient cycling within forest ecosystems. However, studies focusing on the litter decomposition process during forest succession are not common. Therefore, we investigated the decomposition rates of litter, enzyme activities, fungal communities, and functional genes in pine needles and twigs in pure ( Pinus massoniana ) and mixed ( P. massoniana and Liquidambar formosana ) forests over three consecutive years. The results indicated that the decomposition rate of pine needles ranges from 57.79 % to 74.53 %, while the decomposition rate of pine twigs ranges from 24.16 % to 60.57 %. There is no significant difference in the litter decomposition rates between mixed and pure forests. During litter decomposition, the activity of acid phosphatase in pure forests was consistently higher than in mixed forests. Pure forests recruited more unique fungi to participate in decomposition compared to mixed forests. The fungal network connections in mixed forests are more complex than those in pure forests, and they become even more complex in the later stages of decomposition. There are differences in functional gene structure between mixed and pure forests, with an increase in the abundance of nitrogen cycle genes ( nirK 1, nirK 2, nirK 3, nirS 1, nirS 2) and phosphorus cycle genes ( phoX ) in mixed forests, thereby promoting nutrient cycling. In summary, these research results provide new insights into the mechanisms that regulate ecosystem functions and fungal community during forest succession.
研究领域:
生态学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ying Su,Tingting Fan,Haoyan Bai,Hengshu Guan,Xin Ning,Miao Yu,Yunze Long
The challenge of effectively separating oily wastewater discharge in the industry has inspired researchers to explore advanced oil/water separation materials. In this work, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofiber (PNF) membranes were prepared by solution blow spinning, which is a novel type of spinning technology with advantages of high fiber yield, high safety and low energy consumption. Then, pine needle-like titanium dioxide (TiO 2 ) nanorods (TNs) were grown on PNF by hydrothermal method. This pine needle-like hierarchical micro-nano structure greatly increased the roughness of the membrane surface. Then, further fluorination treatment made the prepared PNF@TNs-1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDS) membrane exhibited superhydrophobicity and superlipophilicity which water contact angle was 155.0° and oil contact angle was 0°. The PNF@TNs-PFDS membrane could effectively separate a variety of oil/water mixtures (such as dichloromethane, n-hexane, kerosene and toluene) by gravity. The separation efficiency (toluene/water) of the membrane reached up to 99.99% and the oil (dichloromethane)/water separation flux reached up to 9845 L m −2 h −1 . Moreover, the membrane exhibited excellent self-cleaning performance and cycle performance. The toner on the membrane could be washed away with water flow and the membrane still maintained high separation efficiency after being recycled for 10 times. In addition, the PNF@TNs-PFDS membrane could also degrade organic pollutants when treating industrial oily wastewater, indicating its potential application in water purification treatment.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Jianhua Qu,Yang Liu,Jiao Meng,Fuxuan Bi,Shouyi Ma,Guangshan Zhang,Yifan Wang,Yue Tao,Zhao Jiang,Ying Zhang
Herein, magnetic porous pinecone-derived hydrochar (MPHC MW ) co-activated by KHCO 3 and K 2 FeO 4 through one-step microwave-assisted pyrolysis was innovatively synthesized for hexavalent chromium (Cr(VI)) and anthracene (ANT) removal from water. The analyses of characterization consequences and co-activation mechanisms not merely proved the high specific surface area (703.97 m 2 /g) and remarkable microporous structures of MPHC MW caused by the synergistic chemical activation of KHCO 3 and K 2 FeO 4 , but also testified successful loading of Fe 0 and Fe 3 O 4 on MPHC MW by the process of carbothermal reduction between K 2 FeO 4 and carbon matrix of hydrochar. The resultant MPHC MW possessed pH-dependence for Cr(VI), while adsorption for ANT was hardly impacted by the pH of solution. Moreover, the adsorption processes of MPHC MW could attain equilibrium within 60 min for Cr(VI) and 30 min for ANT with multiple kinetics, and the corresponding adsorption capacity for Cr(VI) and ANT was 128.15 and 60.70 mg/g, respectively. Additionally, the adsorption percentages of MPBC MW for Cr(VI)/ANT was maintained at 87.87/82.64% after three times of adsorption-desorption cycles. Furthermore, pore filling, complexation, electrostatic interaction, reduction and ion exchange were testified to enhance the removal of Cr(VI), while the ANT removal was achieved via π-π stacking, complexation, pore filling and hydrogen bonding force.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2012
·
IF 4.805
Yuewu Zhao,Huile Jin,Huan Zhou,Juanjuan Lin,Shun Wang,Jichang Wang
Te@Pd core–shell hybrids were prepared in this study, in which a pine leaf-shaped microstructure was obtained through controlling the synthesis kinetics of single crystal Te. The as-prepared Te was subsequently utilized as the substrate for Pd coating. These core–shell particles were characterized with scanning and transmission electron microscopy, high resolution transmission electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy. When being applied as a catalyst in bromobenzene and phenylboronic acid reaction, 100% conversion of bromobenzene was achieved in less than 3 h, which was much shorter than that required by the reactions using graphene oxide supported Pd catalyst (4 h) or the commercial Pd/C catalyst (>6 h). The Te@Pd core–shell catalyst could be easily recovered from the reaction solution and be used repeatedly. The high catalytic activity of Te@Pd hybrids is attributed to their unique microstructure.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yan Chen,Mingyi Liu,Wenwen Fan,Pengfei Xiao
Residual antibiotics in the environment pose a serious threat to the environment. To solve the problems of inter-particle agglomeration, metal ion leaching and difficult recovery of transition metal oxides as catalysis in advanced oxidation processes for the treatment of antibiotic wastewater, pine needle biochar loaded with iron-nickel bimetals (Fe/Ni@PNBC) were successfully produced by the impregnation-co-precipitation method to activate peroxymonosulfate (PMS) for degradation of oxytetracycline (OTC). The Fe/Ni@PNBC catalyst has good surface properties, abundant functional groups and catalytic stability. Under the optimal conditions, the degradation efficiency of OTC with initial concentration of 10~60 mg/L is close to 90%. In addition, 1 O 2 and O 2 ·−- played a major role in OTC degradation. The reaction mechanism for generation of active species and OTC degradation in the reaction system was proposed from two perspectives including redox of iron and nickel ions in different valence states and interconversion between the active substances. After 5 cycles, Fe/Ni@PNBC still maintained a high catalytic activity for OTC degradation. This study provides a new method to prepare an economical and environmentally friendly catalyst for activating PMS to treat antibiotic wastewater.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Changyu Leng,Kang Sun,Jihui Li,Jianchun Jiang
Dead pine needle derived O, N codoped activated carbons were prepared by an easy one-step carbonization without adding any chemical reagents. The as-obtained PN-X samples had a high rate performance as electrodes for supercapacitors. It was due to the unique structure of cells in dead pine needles, abundant contents of metal elements (K, Na, Ca, Mg) and a large number of heteroatom contents (O, N). The role of different metal atoms and air for the formation of pores, and the mechanism of one-step carbonization were proposed. Micro/Meso/Macropores are beneficial to ion adsorption and transportation, and the doping O and N can improve physical and chemical properties of the carbon surface and increase electrochemical active sites to generate additional pseudocapacitance. All chemical and physical properties of PN-X samples were provided in detail. Especially, the PN-1000 showed a high specific capacitance of 223 F g–1 (178 F cm–3) at 0.5 A g–1 while it still had 150 F g–1 (120 F cm–3) even at 100 A g–1. The results suggested the unique PN-1000 to be a promising electrode material for supercapacitors in many practical applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Shaojun Ke,Jie Zhao,Xinyu Meng,Suyun Wei,Mingjia Zou,Qingze Han,Guofeng Cui
The design of carbonate-selective electrodes with high sensitivity, stability, and selectivity holds significant potential for applications in marine environmental monitoring. In this study, a novel pine-leaf porous structure carbonate ion-selective electrode was prepared with a solid contact layer of silver nanoparticles/polyaniline (AgNPs@PANI) using a two-step electrochemical method involving electropolymerized PANI and electrodeposited AgNPs. The novel structure provides additional charge transport paths and a larger contact area for carbonate ions passing through the selective membrane, thereby enhancing the membrane's carbonate-responsive performance. The results indicate that the GE/AgNPs@PANI/CO32−-ISE demonstrates a near-Nernst response (−29.5 ± 0.2 mV per decade) to carbonate ions over a wide concentration range (10−1–10−6 M) as well as a low carbonate detection limit (1.15 × 10−7 M), with excellent performance in terms of response speed (5.5 s), reversibility (1.35 mV), long-term potential stability (0.17 mV h−1), and selectivity. The developed electrode was applied to the detection of carbonate in real seawater using the standard addition method, and the average recovery was found to be 95–105%. Meanwhile, the results of carbonate ion detection in real samples using this electrode were largely consistent with those obtained by potentiometric titration, demonstrating significant practicality in marine chemistry research.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiwang Chen,Yuanyuan Rao,Jiawei Huang,Nianlong Cheng,Guangyu Zhou,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
Developing air cleaning membranes that simultaneously meet the needs of efficient moisture transfer, particulate matter (PM) filtration, and bacterial inhibition still faces great challenges. Herein, a membrane with asymmetric wettability and pine-needle-like nanorods (NRs) was successfully prepared through hydrothermal treatment following sequential electrospinning. The zinc oxide (ZnO) nanorods, in-situ grown on the hydrophilic polyacrylonitrile (PAN) fibers, guide water transfer by extending to hydrophobic polyvinylidene fluoride (PVDF) channels, enhancing unidirectional water transport. Meanwhile, the ZnO nanorods also release antibacterial active ingredients and increase the contact between fibers and aerosols, so harmful microbes are deactivated after the aerosols are captured by the membrane. Consequently, the PVDF/(ZnO NRs@PAN) membrane exhibits an excellent water vapor transport rate (12.47 kg m −2 d − 1 ), PM 0.3 removal efficiency (99.83%), and bacteria inhibition rate (99.99%). Moreover, the membrane maintains high filtration performance after 10-cycle filtration and cleaning. Thus, the membrane shows extensive application prospects in the scenario that involves aerosol filtration, moisture management, and microbe inhibition, such as masks, protective clothing, and fresh air systems. This work paves the way for developing multi-functional air cleaning membranes with asymmetric wettability, based on interface design and microstructure regulation.
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2023
·
IF 1.3
Xia Chenjie,Zhu Hongliu,Hu Changhui,Liu Jie,Hua Haibing,Yang Jianqiu,Chen Zhipeng,Gao Yihong
Pinus massoniana needles, a traditional herb, were applied to prevent hair loss in China. Studies available mainly focused on pine needle flavonoids with various biological activities. However, there has been no pharmacokinetics study of the flavonoids from Pinus needles extract. A selective and sensitive ultra-high performance liquid chromatography–tandem mass spectrometry (UHPLC-MS/MS) method was developed to simultaneously quantify taxifolin, quercetin and catechin in rat plasma. To separate the three constituents, an Agilent Extend-C18 column (2.1 mm × 100 mm, 1.8 μm) was used with a mobile phrase of (A) 0.1% formic acid and (B) acetonitrile. The analytes were measured by multiple reaction monitoring in the negative ionization mode. There was good linearity in the established UHPLC-MS/MS method, with a coefficient of determination (r2) of >0.99. The accuracy, intra-day and inter-day precision and recovery were all satisfactory and these 3 compounds were stable under the tested conditions. The validated method in this study was successfully applied to pharmacokinetic study in healthy rats after oral and transdermal administration of Pinus needles extract. The results could provide further research foundation for pine needle extract as external preparations.
研究领域:
中药学
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分析化学
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药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Xiaoxiao LU,Jingchan ZHAO
The biochar (FS-PNBC) is prepared by pyrolyzing mixed biomass of fish scale and pine needle in varied proportions in a tube furnace. The biochar was characterized by a specific Brunauer-Emmett-Teller (BET) surface area analyzer, scanning electron microscope (SEM), Fourier infrared spectrometer (FTIR), and X-ray diffractometer (XRD). In a solution with an initial concentration of 60 mg/L, the adsorption of ciprofloxacin (CIP) by a 1:1 ratio of fish scale and pine needle co-pyrolyzed biochar (FS-PNBC1) reached 27.97 mg/g. The adsorption properties such as thermodynamics, kinetics, isothermal adsorption, and adsorption factors were investigated by batch experiments. The results indicate that FS-PNBC exhibits a significantly large specific surface area, abundant pore structure, and a high level of porosity. After approximately 180 min, adsorption equilibration was achieved in a pH=4 solution. The kinetic data was well-matched with a quasi-second-order model, suggesting that chemisorption plays a role in the adsorption process. Isothermal adsorption and thermodynamic results indicate that the adsorption of CIP by biochar is more consistent with the Freundlich model, which suggests multilayered non-homogeneous phase adsorption and an exothermic entropy-increasing reaction capable of proceeding spontaneously. FS-PNBC contains oxygen-containing functional groups, and through FTIR analysis, it was observed that hydrogen bonding, π-π bonding, and electrostatic interaction are closely linked to adsorption. This study demonstrates that biochar produced through the co-pyrolysis of fish scale and pine needle has the potential to serve as an efficacious adsorbent for extracting ciprofloxacin from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Mian Zhu,Chao Lyu,Feng Dai,Jingxian Liu
To develop an environmentally friendly CO 2 capture technology, composite adsorbent beads were synthesized through the in situ growth of ZIF-8 in a nanocellulose gel scaffold prepared from pine needles-derived cellulose. The composite beads were subsequently functionalized with three ionic liquids ([BMIM][PF 6 ], [BMIM][BF 4 ], and [EMIM][TF 2 N]), which induced partial dissolution of the nanocellulose. This process resulted in the formation of unique wrinkled microstructures, resembling rice grains in morphology but exhibiting higher compressive strength. Notably, the IL-loaded CNF/ILs@ZIF-8 composites exhibited significantly superior adsorption performance over unmodified CNF@ZIF-8 (CZ) beads. Under static conditions (3 bar, 273 K), all three functionalized CNF/ILs@ZIF-8 variants enhanced CO 2 uptake capacities by > 46 %, with the [BMIM][PF 6 ] modified beads retaining 85.36 % of initial adsorption capacity after six adsorption–desorption cycles. Furthermore, under competitive dynamic adsorption (1 bar, 273 K), the [BMIM][BF 4 ] modified beads achieved a 43.12 % enhancement in CO 2 /N 2 selectivity compared to CZ. This work provides a MOF granulation strategy with process safety and environmental sustainability, potentially extending MOF applications in gas adsorption technologies.
研究领域:
环境科学
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材料工程
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化学工程
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纳米技术
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气体吸附
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）