EUROPEAN POLYMER JOURNAL
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2018
·
IF 3.741
Ruoyun Li,Linbo Wu,Bo-Geng Li
PEG-mb-PBAT (EB, for simplicity) multiblock copolymers were synthesized via chain extension/coupling of poly(ethylene glycol) (PEG) and poly(butylene adipate-co-terephthalate) (PBAT) diols, and used as modifiers to prepare blends of commercial poly( l -lactide) (PLLA) and EB via melt blending. The EB copolymers were characterized by 1 H NMR and DSC, and the PLLA70/EB30 blends were characterized by DSC, SEM, tensile and impact testing. The PEG segments in EB show greatly depressed crystallization as compared with PEG prepolymer, therefore, exhibit excellent plasticization effect on PLLA. Furthermore, they also compatibilize the PBAT microphase with PLLA matrix. Owing to strong interfacial adhesion, the PBAT micro-phases induces highly oriented shear yielding during impact process and therefore act as efficient tougheners of PLLA. Therefore, the blends possess highly improved toughness (impact strength 44 kJ/m 2 ) and excellent ductility (elongation 160%), and at the same time, retain sufficient stiffness. Furthermore, the L/EB blends show superior mechanical performances than the L/EP (PLLA/PEG-mb-PPA) blends reported by us previously.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 18
·
IF 1.86
Binshuang Wu,Xiaoqing Zeng,Linbo Wu,Bo-Geng Li
In order to obtain high performance bioplastics and thermoplastic elastomers, P(LLA-mb-BSA) multi-block copolymers containing 30 wt % and 70 wt % soft segment (PLBSA30 and PLBSA70 for short) were synthesized via chain extension and coupling of poly(L-lactic acid) (PLLA) and poly(butylene succinate -co- adipate) (PBSA) prepolymers in the presence of 1% nucleating agent (NA). They were characterized with proton nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), polarizing optical microscopy (POM), thermal gravimetric analysis (TGA), transmission electron microscope (TEM), and tensile and impact test. The relatively high molecular weights of ( M n 8200 g/mol and 3100 g/mol for PLLA and PBSA, respectively) the polyester sequences are helpful to improve the PLLA crystallization and the flexibility of the PBSA soft segment. Nucleation effect further accelerates the crystallization of PLLA segment. The synergistic effect of these factors results in good balance between stiffness and toughness. PLBSA30s containing 1% zinc citrate (ZnCC) or talc behave as ultra-tough bioplastics with ultrahigh impact strength over 50 kJ/m 2 and excellent tensile properties. PLBSA70 containing 1% ZnCC possesses elongation at break of 600% and retains high modulus (56 MPa) and strength (16 MPa) and therefore behaves as an excellent thermoplastic elastomer. The excellent and balanced properties would extend the end applications of these PLLA-based materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44777.
研究领域:
材料科学
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高分子化学
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高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
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2018
·Vol. 233
·期 3
·347-359
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IF 1.144
Zuming He,Yongmei Xia,Bin Tang,Jiangbin Su,Xingfang Jiang
A series of magnetically recyclable NiFe 2 O 4 /ZnO nanocomposites have been successfully fabricated by a facile two-step route. The as-prepared NiFe 2 O 4 /ZnO nanocomposites were characterized by X-ray diffraction, field-emission scanning electron microscopy, vibrating sample magnetometer, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The results demonstrate that the NiFe 2 O 4 /ZnO nanocomposites are composed of ZnO particles (50–120 nm) integrated with NiFe 2 O 4 particles (30–80 nm) . Compared with bare ZnO, the NiFe 2 O 4 /ZnO nanocomposites exhibit evidently enhanced visible light absorption and decreased recombination of photo-generated electron-hole pairs. Moreover, the nanocomposites exhibit enhanced photocatalytic performance for the degradation of methylene blue under simulated solar light irradiation when compared with bare ZnO, and the 20%-NiFe 2 O 4 /ZnO nanocomposite is observed as the optimal composite. This is ascribed to the more efficient separation of photo-generated electron-hole pairs and generation of hydroxyl (˙OH) radicals in the 20%-NiFe 2 O 4 /ZnO nanocomposite. Furthermore, the NiFe 2 O 4 /ZnO nanocomposites have a high saturation magnetization, indicating that they can be magnetically separated and recycled from organic dye wastewater.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
Liu Yang,Feng Peizhong,Wang Zhang,Jiao Xinyang,Akhtar Farid
Porous monoliths of MoO 3 nanoplates were synthesized from ammonium molybdate (AHM) by freeze-casting and subsequent thermal treatment from 300 to 600 °C. Pure orthorhombic MoO 3 phase was obtained at thermal treatment temperature of 400 °C and above. MoO 3 monoliths thermally treated at 400 °C displayed bimodal pore structure, including large pore channels replicating the ice crystals and small pores from MoO 3 sheets stacking. Transmission electron microscopy (TEM) images revealed that the average thicknesses of MoO 3 sheet were 50 and 300 nm in porous monoliths thermally treated at 400 °C. The photocatalytic performance of MoO 3 was evaluated through degradation of methylene blue (MB) under visible light radiation and MoO 3 synthesized at 400 °C exhibited strong adsorption performance and best photocatalytic activity for photodegradation of MB of 99.7% under visible illumination for 60 min. MoO 3 photocatalyst displayed promising cyclic performance, and the decolorization efficiency of MB solution was 98.1% after four cycles.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Kai-Ning Zhang,Cheng-Zhen Wang,Qiu-Feng Lü,Ming-Hui Chen
Functionalized two-dimensional Ti 3 C 2 T x (TN-EHL) was prepared as an effective adsorbent for removal of methylene blue dye (MB) and copper ions (Cu 2+ ). Enzymatic hydrolysis lignin (EHL), a reproducible natural resource, was used to functionalize the Ti 3 C 2 T x nanosheets. EHL can not only introduce active functional groups into TN-EHL but also prevent the oxidation of Ti 3 C 2 T x , thus promoting the adsorption performance of TN-EHL. The maximum adsorption capacities of TN-EHL50 (in which the EHL content is 50 wt%) for MB and Cu 2+ were 293.7 mg g −1 and 49.96 mg g −1 , respectively. The higher correlation coefficients ( R 2 ) of MB (0.9996) and Cu 2+ (0.9995) indicating that their adsorption processes can be described by the pseudo-second-order kinetic model. The MB adsorption data fit the Freundlich isotherm with R 2 of 0.9953, whereas the Cu 2+ ions adsorption data fit the Langmuir isotherm with R 2 of 0.9998. The thermodynamic analysis indicates that the adsorption process of MB and Cu 2+ on TN-EHL50 is spontaneous and endothermic. Significantly, the Cu 2+ ions were reduced to Cu 2 O and CuO particles during the adsorption process. Therefore, TN-EHL has a great potential as an environmentally friendly adsorbent for MB removal and recovery of Cu 2+ ions from wastewater.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yunxiu Sun,Wei Chen,Xiaoqing Li,Qinyang Yu,Yuxin Zhu,Yitong Wang,Lin Chen,Wei Sun,Guangjiu Li,Yanyan Niu
In the study titanium dioxide ( TiO 2 ) doped three-dimensional graphene ( 3DGR ) nanocomposite ( TiO 2 @3D GR ) was prepared via a one-step hydrothermal synthesis method. SEM results showed a three-dimensional network structure with TiO 2 particles uniformly loaded in the graphene pores. Using PBS with different pH values as supporting electrolyte, the influence of acid-base property on the electrochemical experiments based on the proposed biosensor ( Nafion/Mb/TiO 2 @3DGR/CILE ) was investigated. The effect of sweep speed on electrochemical behavior was further explored. Nafion/Mb/TiO 2 @3DGR/CILE showed good electrocatalytic activity for trichloroacetic acid, NaNO 2 and H 2 O 2 with K M app as 107.12 mM, 31.53 mM and 34.23 mM, obtaining wider range of linearity and lower limit of detection. The biosensor is of important significance for future research and development of electrochemical biosensor.
研究领域:
生物化学
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材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.3
Jing Chen,Wenjing Liu,Rongfang Ma,Jingjing Nan,Shuai Wang
Kaempferol (KA) is an important natural flavonoid compound, and its sensitive detection is of great significance in food science and pharmacological analysis. To address the problems of traditional electrochemical sensors being susceptible to environmental interference and having poor stability in complex samples, this study successfully prepared a polydopamine-modified MXene/methylene blue composite material (PDA@MXene/MB), and constructed a novel ratio electrochemical sensor for the highly selective and sensitive detection of kaempferol. This sensor utilizes the high conductivity and large specific surface area of MXene as an ideal base, and through the in-situ polymerization of polydopamine, effectively prevents the stacking of MXene layers and simultaneously fixes methylene blue (MB) as a stable and reliable internal reference signal. During the detection process, the ratio of I KA /I MB is used for quantitative analysis, effectively eliminating the interference of background current fluctuations and environmental factors. Experimental results show that this sensor exhibits excellent analytical performance for kaempferol, presenting a good linear relationship within the concentration range of 0.4-36 µM, with a detection limit of 49 nM. Moreover, the sensor demonstrates good selectivity, reproducibility and stability, and it was also successfully used to determine kaempferol in actual tablet sample, yielding satisfactory recovery rates.
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高影响因子
Analytical Methods
·
2026
·
IF 3
Jiajia Wang,Chun Kan,Demeng Qian,Mingping Gao,Ayang Zhou,Bao-Kang Jin
CA-125, as a tumor marker for ovarian cancer, plays an importance role for rapid and sensitive detection in early diagnosis. Herein, a label-free electrochemical immunosensor based on COF/PTh/MB nanocomposite was constructed for the detection of CA-125.The TAPB-DMTP-COF material, with its large surface area and stable porous framework, was used as the substrate. However, its poor conductivity hindered electron transfer. To address this, conductive polymer PTh was combined with the COF to enhance the composite's conductivity. Meanwhile, MB was used as a signal probe, and differential pulse voltammetry (DPV) was adopted to measure the electrochemical signal. Under optimized experimental conditions, the proposed immunosensor exhibited excellent performance for the CA-125 detection, with a detection range of 1 mU/mL-10000 mU/mL, and a low detection limit of 0.34 mU/mL (S/N = 3), providing a potential platform for clinical application.
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 13
·10144-10149
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IF 4.6
Lang Yang,Jialei Ying,Zhenzhong Liu,Guangyu He,Linli Xu,Mingyue Liu,Xinlei Xu,Guihua Chen,Meili Guan
Although TiO2 has been widely applied in many fields, the design and preparation of one-dimensional rutile TiO2 nanomaterials for high-efficiency photocatalysis under visible light remain challenging. Herein, uniform Co-doped rutile TiO2 nanorods with selective adsorption and photocatalytic activity for methylene blue (MB) have been developed via a one-pot molten salt flux method. Compared to pure rutile TiO2 nanorods, the Co-doped rutile TiO2 nanorods exhibited an obvious core/shell structure with smaller inner crystal face spacing (d001 = 0.20 nm) and a larger rough surface (the BET specific surface area is 25 m2 g−1). Furthermore, different dyes were employed to investigate the adsorption ability of Co-doped rutile TiO2 nanorods. The density functional theory (DFT) calculations determined that both the electrostatic potential and molecular structure could influence the adsorption behavior on the photocatalyst surface. The results indicated that the Co-doped TiO2 nanorods possessed a high selective adsorption capacity for MB (134.54 mg g−1 in neutral solution). The degradation of MB using Co-doped rutile TiO2 nanorods was conducted under visible light irradiation, yielding with an apparent rate constant of 0.301 min−1 at pH = 7. The degradation mechanism was further explored through electron spin resonance (ESR) experiments, which identified the formation of superoxide anions (·O2−) and hydroxyl radicals (·OH) in the system. This study provides a new strategy for preparing novel rutile TiO2 photocatalysts for the degradation of organic dyes under visible light.
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
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 4
·1-12
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IF 3.8
Liu Yonghong,Yang Xiaoxiao,Wang Ning,Wang Quanhong
While high-efficiency photocatalysts have been extensively researched, there is still a scarcity of reports focusing on enhancing the practical application conditions of low-cost engineering photocatalysts. In this study, a 13.8-L continuous streamer catalytic reactor was developed utilizing low-cost self-made TiO 2 /ACF photocatalyst. Employing the Box-Behnke response surface method, the study assessed the reactor’s efficiency in treating organic wastewater using methylene blue (MB) as the model pollutant. The TiO 2 /ACF photocatalysis was characterized by XRD, EDS, and SEM, and the results showed that the nano-TiO 2 was uniformly loaded with the surface of activated carbon fibers in a lamellar form. Results indicated that with a single cycle time of 134 min and a catalyst amount of 95 cm × 95 cm, the average decolorization rate for 3 mg/L MB wastewater was 90.63%, following quasi-second-order kinetics. The MB wastewater’s decolorization efficiency swiftly reached 89.8% within the initial 120 min, maintaining around 90% during continuous 600-min treatment. The optimal catalyst condition was identified, enhancing photodegradation efficiency of MB organic molecules. The developed photocatalytic equipment exhibited high efficiency and stability in degrading low-concentration organic molecules.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Hailong Zhang,Haishui Xu,Ruimeng Li,Ling Quan,Chengyu Zhan,Peng Han,Yangyu Liu,Yuping Tong
Graphitic carbon nitride (g-C 3 N 4 ) is widely utilized in photocatalysis due to its responsiveness to visible light, low cost, and non-toxicity. However, its efficiency is limited by factors such as the rapid recombination of photogenerated electron-hole pairs, slow electron transfer rates, and a limited number of active surface sites. In this study, g-C 3 N 4 was synthesized through thermal polymerization, and varying amounts of graphene oxide (GO) were incorporated via physical blending to fabricate composite photocatalysts. The results indicated that the incorporation of GO not only increased the specific surface area and modified the pore size distribution of g-C 3 N 4 but also affected the heptazine ring structure through chemical bonding, thereby enhancing the density of active sites. Photocatalytic degradation experiments with methylene blue (MB) indicated that g-C 3 N 4 containing 2 % GO exhibited photocatalytic activity 2.84 times greater than that of pristine g-C 3 N 4 . Kinetic simulations indicated that the K app value for the 2 % GO-g-C 3 N 4 composite was 0.00469 min −1 , which is 4.34 times higher than that of pure g-C 3 N 4 (0.00108 min −1 ). Furthermore, this composite maintained high photocatalytic activity after four cycles of reuse. An analysis of the photocatalytic degradation mechanism revealed that the incorporation of GO effectively promoted the separation and transfer of photogenerated electron-hole pairs, enhanced photocurrent density, and improved carrier separation efficiency. Electron spin resonance (ESR) and free radical scavenging experiments confirmed that the primary active species involved in the degradation of MB by the composite photocatalyst were ·O 2 - and h + . This study presents a novel approach for enhancing the photocatalytic performance of g-C 3 N 4 by modifying its electronic structure and surface properties.
研究领域:
材料科学
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环境科学
·
光催化技术
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高影响因子
Journal of Nano Research
·
2024
·
IF 0.8
Yong Li,Ya Liang Chen,Yan Qun Shao
Photocatalysis properties enhanced by metal and organic polymer has been received more interest because of their ability to directly or indirectly degrade pollutants. The effect of PDA (polydopamine) and Ag nanoparticles on the different phases of ZnO to degrade organic dyes under visible and UV-vis light was investigated. ZnO@PDA, ZnO-Ag, and ZnO-Ag@PDA nanoparticles were synthesized. It’s shown that Ag particles with sizes of less than 20 nm were deposited evenly on the ZnO. There were a few changes in the structure of ZnO@PDA or ZnO-Ag @PDA. When the ZnO was coated by PDA, the photocatalytic activity could be enhanced. The photocatalytic activity under UV-vis and visible light of the ZnO@PDA were effectively improved. The degradation rate of ZnO-Ag@PDA was 97.9% under UV-vis light for 20 mins, which was 16.1% higher than that of ZnO. The photocatalytic activity of ZnO-Ag@PDA reached the maximum after polymerizing for 2 hours. The photocatalytic efficiency of ZnO-Ag@PDA-2h under UV-vis for 30 minutes can reach higher than 99.01%. The photocatalytic performance decreased rapidly with the increasing cycles. When the number of cycles was 5, the degradation rate was 65.84%. Afterward, the degradation rate changed small and became stable.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
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