ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 6
·6338-6351
·
IF 2.914
Yang Yi,Zhang Huiping,Huang Haoxin,Yan Ying,Zhang Xinya
A kind of novel iron-loaded carbon nanotube-microfibrous composite (Fe 2 O 3 -CNT-MF) catalyst is prepared and tested for fixed bed m-cresol catalytic wet peroxide oxidation (CWPO) reaction. Results show that the Fe 2 O 3 -CNT-MF can significantly decline the pressure drop of the fixed bed. Higher temperature, lower feed flow rate, higher catalyst bed height, and higher H 2 O 2 dosage are beneficial to m-cresol degradation. Lower pH can also improve m-cresol degradation, but it will cause severe iron leaching. The highest m-cresol removal (over 99.5%) and total organic carbon (TOC) removal (53.6%) can be observed under condition of 2 cm bed height, flow rate of 2 mL/min, reaction temperature of 70 °C, 6 g/L H 2 O 2 , and initial pH = 1. Meanwhile, the Fe 2 O 3 -CNT-MF catalyst shows good stability with less than 10% decrease in m-cresol conversion and 7% decrease in TOC conversion after 24-h reaction and less than 2 mg/L iron leaching is observed in all conditions except for strong acid condition. Two probable pathways of m-cresol degradation process are presented. Under most conditions, m-cresol will first be turned into methylhydroquinone, followed by oxidation to p-toluquinone. In basic condition, some m-cresol will first be changed into 4-methylpyrocatechol. These aromatic intermediates will then be oxidized into some small molecular acids and finally be mineralized to CO 2 and H 2 O.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yi Yang,Huiping Zhang,Ying Yan
A novel microfibers entrapped carbon-nanotube composite catalyst with iron loaded (MF-CNT-Fe 2 O 3 ) was develop followed by fixed bed catalytic wet peroxide oxidation (CWPO) of m-cresol. Firstly, the microfibers entrapped carbon-nanotube composite (MF-CNT) support was prepared by wet lay-up papermaking process and sintering process and the entrapment ratio of support was evaluated. Then active components were loaded on support by metal organic chemical vapor deposition (MOCVD) method. Characterizations were carried out including Field-Emission Scanning Electron Microscope (FE-SEM), Energy Dispersive Spectroscopy (EDS), N 2 adsorption–desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H 2 -Temperature-Programmed Reduction (H 2 -TPR) and Thermogravimetric Analysis (TG), respectively. At last, catalytic activity was tested. Results showed that the best entrapment ratio (72.5%) occurred when stirring time was 9.5 min and the mass ratio of CNTs to stainless steel fibers was 6:3. Characterization results illustrated that advanced three-dimensional network was formed in the microfibers composites and catalysts performed high thermal stability. CNTs were successfully entrapped in the fibers and iron components were uniformly dispersed on supports. CWPO results showed that MF-CNT-Fe 2 O 3 catalysts prepared by MOCVD performed better than by impregnation method. Additionally, MF-CNT-Fe 2 O 3 catalysts could perform high CWPO activity (m-cresol conversion highest at 99% and TOC conversion highest at 42%, respectively). Little iron loss was observed in all treated effluents.
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wenlong Tu,Haodong Li,Bo Li,Jie Cheng,Ping Xu,Wuxiang Zhang,Zengjing Guo,Jing Zhao,Fanghua Li,Yiyan Song,Fu Yang
The increasing complexity of environmental pollution posed a higher requirement for the development of environment-governed functional materials . Herein, to achieve desired synergy and multiple functionalities of eco-friendly nanomaterials , a micelle-mediated metal assembly strategy was proposed to integrate plasmonic Ag nanoparticles into MnO x modified mesoporous silica hosts by metal-modified neutral dodecyl amine surfactant , correspondingly, a multifunctional mesoporous Ag@MnOx/m-SiO 2 (AMSs) nanocomposite was obtained. The characterization results revealed that the introduction of Mn and alteration in the amount of Ag mediated the formation of a special mesostructure and nanometric morphology of the silica host. Bearing a low Ag loading (r.t. of Ag/Mn = 1/2), ultrafine Ag nanoparticles were embedded in the inner core of mesoporous silica nanospheres . While assembly with a higher Ag concentration affected the morphology of the obtained AMSs and resulted in rich Ag nanoparticles on the exterior surface of mesoporous silica. By this strategy, ultrafine Ag nanoparticles and well-dispersed amorphous MnO x species were coupled into the mesoporous silica to reach a special configuration and integrated functionality. The obtained AMSs-3 can effectively inactivate bacteria ( E. coli , S. aureus, and P. aeruginosa ) with a prolonged inhibitory effect, rapidly reduce harmful nitrophenol, as well as photothermally assist water evaporation (evaporation rate of 1.51 kg m −2 h −1 , receiver efficiency of 87%). This work provides versatile environment-governing functional nanomaterials for both highly effective antimicrobial and environmental remediation.
研究领域:
环境科学
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材料科学
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纳米技术
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2024
·
IF 10.5
Jiaojiao Wu,Xueyan Wei,Zhenguang Li,Haotian Chen,Rui Gao,Peng Ning,Yingze Li,Yu Cheng
Using mechanical cues for cancer cells can realize precise control and efficient therapeutic effects. However, the cell cycle-specific response for dynamic mechanical manipulation is barely investigated. Here, RGD-modified iron oxide nanomanipulators were utilized as the intracellular magneto-mechanical transducers to investigate the mechanical impacts on the cell cycle under a dynamic magnetic field for cancer treatment. The G2/M phase was identified to be sensitive to the intracellular magneto-mechanical modulation with a synergistic treatment effect between the pretreatment of cell cycle-specific drugs and the magneto-mechanical destruction, and thus could be an important mechanical-targeted phase for regulation of cancer cell death. Finally, combining the cell cycle-specific drugs with magneto-mechanical manipulation could significantly inhibit glioma and breast cancer growth in vivo . This intracellular mechanical stimulus showed cell cycle-dependent cytotoxicity and could be developed as a spatiotemporal therapeutic modality in combination with chemotherapy drugs for treating deep-seated tumors.
研究领域:
癌症生物学
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纳米技术
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生物医学工程
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治疗学
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
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2019
·Vol. 9
·期 1
·1-10
·
IF 4.011
Wang Yaozong,Sun Naikun,Zhang Yinlong,Zhao Bin,Zhang Zheyi,Zhou Xu,Zhou Yuanyuan,Liu Hongyi,Zhang Ying,Liu Jianguo
This study explored the applicability, cellular efficacy, and osteogenic activities of porous nano-hydroxyapatite/Poly (glycerol sebacate)-grafted maleic anhydride (n-HA/PGS-g-M) composite scaffolds. Nuclear magnetic resonance (NMR) analyses indicated that approximately 43% of the hydroxide radicals in PGS were displaced by maleic anhydride. Resonance bands at 1036 cm −1 occurred in scaffolds containing nHA powders, and peak areas increased when n-HA weight increased in PGS-M-n-HA-0.4, PGS-M-n-HA-0.5, and PGS-M-n-HA-0.6 scaffolds. The n-HA/PGS-g-M composite scaffolds exhibited porous microstructure with average pore size of 150–300 µm in scanning electron microscopy (SEM) analysis. Differential scanning calorimetry (DSC) identified the glass transition temperature (Tg) as −25–30 °C, indicative of quality resilience. The modulus of compressibility increased when n-HA content increased. Interestingly, viability of human adipose-derived stem cells (hADSCs) in vitro and expression of the osteogenic related genes RUNX2 , OCN , and COL1A1 was enhanced in the n-HA/PGS-g-M composite scaffolds compared to those factors observed in PGS-g-M scaffolds. Finally, simulated body fluid (SBF) tests indicated more apatite deposits on the surface of n-HA/PGS-g-M scaffolds compared to PGS-g-M scaffolds. Overall, porous n-HA/PGS-g-M composite scaffolds possessed acceptable biocompatibility and mechanical properties, and they stimulated hADSC cell proliferation and differentiation. Given these qualities, the composite scaffolds have potential applications in bone tissue engineering.
研究领域:
组织工程
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生物材料科学
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干细胞研究
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材料科学
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产品关联
DOI
PubMed
高影响因子
FOOD CONTROL
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2023
·
IF 6
Xiaoyue Yang,Christophe Blecker,Huan Liu,Dequan Zhang,Zhenyu Wang
To elucidate the regulation of different structures of polyphenolic compounds with m-hydroxy and o-hydroxy groups inhibiting the formation of different heterocyclic amines (HAs), the reactions between classified polyphenols (cover flavonoids , phenolic acids , stilbenes, coumarins, chalcones, and with different hydroxyl groups) and roasted lamb patties were studied, and then validated in model systems in vitro. The results indicated that the chalcone, coumarin, and stilbene compounds were more efficient to inhibit the HAs generation in roasted lamb patties in comparison with the flavonoids, while phenolic acid had the worst effect. Besides, polyphenols inhibit the formation of HAs through a synergistic action of scavenging free radicals and trapping active carbonyls. Polyphenols with m-hydroxyl structures have a stronger inhibition of PhIP 1 , Harman and Norharman by capturing the reaction intermediate carbonyl compounds . Polyphenols with the o-hydroxyl group had a stronger inhibitory effect on MeIQx by scavenging free radicals. It was concluded that the ability of polyphenols to inhibit different HAs can be predicted by their m-hydroxyl and o-hydroxyl groups.
研究领域:
食品科学
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化学
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药理学
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营养学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3061-3079
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IF 1.674
Wang Junxiu,Chen Kuan,Shen Yi,Wang Xi,Guo Yongfu,Zhou Xiaoji,Bai Renbi
Abstract To heighten the absorption to visible light and improve photocatalytic degradation to organic pollutants, a novel photocatalyst of m-Bi 2 O 4 /Bi 2 O 2 CO 3 was constructed through a facile hydrothermal method. The crystal structure, optical properties, morphology, composition and photocatalytic ability of the photocatalysts were characterized via X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscope (TEM), high resolution TEM, selected-area electron diffraction and X-ray photoelectron spectroscopy technologies. The as-prepared photocatalysts could efficiently degrade rhodamine B and mixed dye under visible light. The removal rate was up to 95.3% within 50 min. The results demonstrated that m-Bi 2 O 4 /Bi 2 O 2 CO 3 photocatalysts showed outstanding photocatalytic degradation ability compared to the single photocatalyst with the narrow band gap. In addition, photocurrent response tests certified that the heterostructure of the photocatalysts effectively accelerated the separation and migration of photo-induced electrons and holes. Active species trapping experiments indicated that holes (h + ) and superoxide radical (•O 2 − ) were major species rather than hydroxyl radicals (•OH) during the degradation process of organics. According to the test results, a probable photocatalytic mechanism was proposed. This work provided a new and efficient photocatalyst for environmental remediation and water treatment. Graphical Abstract
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Yingchun Song,Yuyu Teng,Yudi Chen,Jiahui Nie,Yajie Dong,Qianqian Fan,Junxiang Zhu,Hao Wu,Yongkai Yuan
Biofilm-state probiotics can effectively improve their tolerance in harsh environments. Previous studies have shown that calcium alginate is an effective carrier for promoting biofilm formation, but its mechanism is unclear. Here, we show that tuning alginate molecular weight (Mw) and mannuronic/guluronic (M/G) directs Lactobacillus rhamnosus GG (LGG) biofilm formation and gastrointestinal tolerance. Our key finding is that calcium alginate beads with low Mw and low M/G alginates produce denser biofilms and superior gastrointestinal tolerance. These formulations markedly improved LGG survival in simulated challenges (gastric acid: 0.02–0.28 log CFU/g loss; bile: 1.54–2.31 log CFU/g), outperforming free cells. Mechanistic analysis revealed that low Mw and low M/G alginate matrices, with larger specific surface area, pore size, and volume, enhanced quorum-sensing autoinducer-2 signaling and subsequent protective extracellular substance synthesis, thereby improving the gastrointestinal tolerance of biofilm-state LGG. Overall, the findings emphasized that controlling alginate structure provides a rational, material-based strategy for designing advanced probiotic or bioactive delivery systems.
研究领域:
微生物学
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材料科学
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食品科学
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分子生物学
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药剂学
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生物材料
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Li Wang,Liyuan Li,Penggang Lv,Xin Gao,Yang Gao,Lu Han,Xuedong Zhu,Kake Zhu
A hierarchically structured ZSM-11/ZSM-5 intergrowth zeolite was generated using a polycationic organic structure-directing agent (OSDA), [-N+(CH2CH2CH2CH3)2-(CH2)8-]n[OH–]n, which is conceptually equivalent to bond-linked tetrabutylammonium (TBA), the frequently used OSDA for ZSM-11 synthesis. The produced ellipsoidal crystals have a major axis length of 130–240 nm and a minor axis length of 75–120 nm, made up of aligned nanocrystals of 44 to 83 nm, to construct an auxiliary macro- to mesopore network ranging from 45 to 80 nm. The Si/Al ratio can be manipulated from 50 to ∞, and the intergrowth exhibits acidity comparable to that of ZSM-5, which is distinct from previous reports that formation of hierarchical porosity or intergrowth often compromises the inherent acidity of zeolitic crystals. Such hierarchical architecture also endows the material with enhanced transport properties, as validated by 2-methylhexane adsorption measurements. In the catalytic methylation of meta-xylene with methanol, the hierarchical ZSM-11/ZSM-5 zeolite exhibited superior performance to that of ZSM-5, with enhanced activity and total trimethylbenzene and tetramethylbenzene selectivity, which was elevated from 28% to 39%. These catalytic merits stem from the combined effects of preserved acid strength, optimized pore connectivity, and alleviated diffusion limitations.
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DOI
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 37
·5494-5501
·
IF 1.9
Min Zhu,Nuerguli Kari,Yin Yan,Abliz Yimit
A m-Cresol Purple-polyvinylpyrrolidone (m-CP-PVP) composite-film was immobilized on the surface of a potassium ion-exchanged glass optical waveguide using the spin-coating method. The optical properties of the film were probed by UV-visible Spectroscopy and Fourier Transform Infrared Spectroscopy. The transmittance variation and the structural properties of the m-CP-PVP composite film/K+-exchanged glass optical waveguide sensor were studied before and after reaction with an amine and volatile organic gases. When the sensing film was exposed to an amine gas, the color changed from yellow to purple/blue. This simply designed sensor was able to measure trimethylamine (TMA) gas down to a concentration of 0.1 ppb at room temperature, and its response and recovery times were 1.4 s and 5.6 s, respectively.
研究领域:
光学传感
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生物医学工程
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分析化学
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纳米材料
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环境监测
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 13
·6934-6944
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IF 11.9
Yuxiao Yang,Jianyun Zhao,Jiuhong Wang,Yinhuan Li,Wei Yu,Shujiang Ding
Magnetic MXene-based composites have been extensively developed for highly effective electromagnetic (EM) wave absorption. However, previously reported studies neglected the influence of regulating primary dissipation sources and electron migration on absorption performance. This is probably due to the fact that the present modification methods frequently severely oxidize MXenes, obliterating the electron migration pathway. Here, a facile strategy is developed to create sandwich-like m-Ti3C2/Fe3O4 (MTF) composites by electrostatic assembly. The room temperature assembly process prevents oxidation and safeguards the in-plane electron migration path of m-Ti3C2. This makes it possible to reveal the mechanism by which increased Fe3O4 content inhibits electron migration, lowers attenuation capacity, and leads to increasing impedance-matching thickness. More importantly, we provide the first explanation of the absorption band transfer phenomenon. Additionally, at a thickness of 2.96 mm, the as-prepared MTF composites exhibit exceptional EM wave absorption capacity, reaching −77.5 dB with an effective absorption band of 3.0 GHz. The comprehensive insight presented in this work offers a solid theoretical foundation for an in-depth understanding of the influence of electron hopping behaviors on electromagnetic characteristics and, consequently, EM wave absorption performance, which further offers an essential roadmap to fabricate high-performance absorbers.
研究领域:
材料科学
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电磁工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kangyu Liu,Bingzhang Shao,Haichao Liu,Jinlong He,Aiguo Zheng,Genghong Li,Bo Zheng,Zeyang Li,Wei Liu,Xuefeng Li,Baoning Zong
Antibacterial monomers are prerequisites for synthesizing antibacterial polymers, especially during the current COVID-19 pandemic. Dimethyl-protected cyclic lysine (DMCL) is a promising functional monomer for nylon-6 based self-cleaning antibacterial polymers. However, the production of DMCL still faces formidable challenges, such as harsh reaction conditions and low catalyst activities. In this study, we developed a Pd/ m -Al 2 O 3 -Si catalyst, which exhibited high efficiency in converting α -amino- ε -caprolactam ( α -ACL) to DMCL, affording a yield of as high as 97.1% at 100 °C and 1 MPa H 2 . The lack of Brönsted acid sites on the catalyst surface facilitated the formation of DMCL and suppressed undesirable hydrolysis or cracking by-products from the lactam-based reactant. The recycled experiments showed that Pd/ m -Al 2 O 3 -Si performed excellent stability and physical strength with essentially no damage to its microspheres after the reaction. The nylon‑6 copolymers produced from the as-synthesized DMCL exhibited similar structure and thermal stability with pure nylon-6, showing great potential in synthesizing the self-cleaning antibacterial polymers. This work provides a sustainable and efficient method for producing DMCL and other lysine-based antibacterial monomers, showing a great prospect for the utilization of bio-based chemicals in synthesizing functional polymers.
研究领域:
有机化学
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材料科学
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生物医学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）