COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Jia-Lin Miao,Jia-Qi Ren,Hui-Jing Li,Da-Gang Wu,Yan-Chao Wu
A mesoporous crosslinked chitosan-activated clinoptilolite biocomposite (CS-GA/ACP) was prepared with chitosan (CS) as the substrate and glutaraldehyde (GA) as the crosslinking agent. Structural analysis of the CS-GA/ACP composite beads was performed using FTIR, SEM , and BET techniques. The adsorption properties of the CS-GA/ACP for Congo red (CR) and methylene blue (MB) removal were examined using a batch method. The effects of CS loading, CS-GA/ACP dosages (0.005–0.25 g), pH values (3−11), initial concentrations (30–300 mg/L), contact time (5–120 min), ionic strength , and temperatures (25–65 ℃) on the adsorption of CR and MB on the CS-GA/ACP composite beads were investigated. The pseudo-second-order kinetics could better describe the adsorption process than the pseudo-first-order kinetics, and the Langmuir isotherms model agreed well with the experimental data. The maximum adsorption capacities of the CS-GA/ACP for CR and MB were 180.59 mg/g and 143.67 mg/g at 25 ℃, respectively. The proposed mechanism studies showed that the possible interaction between the adsorbent and dye molecules were Yoshida H-bonding, dipole-dipole H-bonding, electrostatic interaction and n-π interaction. The CS-GA/ACP can be recycled to remove dyes without significant loss of efficacy, and the adsorption of dyes on the CS-GA/ACP is spontaneous endothermic adsorption. Overall, the CS-GA/ACP showed an excellent performance for dyes removal in aqueous solution and could be a practical candidate for industrial applications.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Hongchao Ma,Yitong Chen,Zhaozhan He,Yanhui Wei
The Maillard reaction , a typical reaction between reducing sugars and amino-compounds, has been considered to be an excellent platform to construct fluorescent probes for detecting different analytes . In this work, an amino-modified hemicyanine dye, 4-(4-aminostyryl)-1-methylpyridinium iodide (ASMPI), has been synthesized as a probe for the fluorescent detection of glucose. The intramolecular charge-transfer (ICT) performance and fluorescence emission property of ASMPI was characterized by UV–vis and fluorescence spectra. According to FTIR and XPS results, the Maillard reaction occurred after adding glucose to ASMPI aqueous solution. The obtained Maillard reaction products resulted in the enhancement of fluorescence emission due to the weakening of ICT process. The effects of solvent polarity (adding ethanol) and temperature on the fluorescent emission of ASMPI-glucose Maillard products were investigated to further amplify their fluorescence signal. The results indicated that the optimal experimental condition were that the ratio of ethanol/water was 9:1 and the temperature was 40 °C. Based on this, a fluorescent assay for the detection of glucose was developed.
研究领域:
分析化学
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生物化学
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材料科学
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产品关联
DOI
高影响因子
Arabian Journal of Chemistry
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2022
·
IF 6.212
Xiaohong Yu,Mian Wang,Yiwen Zhang,Xiaochen Liu,Xiaoyang Zhang,Jinbin Liu,Dujun Wang,Wenbin Jin,Yongmei Lyu
The green and high-value recycling of shrimp shell and straw remains a worldwide problem. This study aimed to investigate the potential utilization of a fermentation broth (FB) which contains shrimp shell and straw as a new source for preparation of biodegradable films. Aureobasidium pullulans and Photobacterium sp. LYM-1 were used in the fermentation. The cellulase activity was 115.92 U/mL and chitinase activity was 17.89 U/mL in FB. The polysaccharides concentration in FB was 1.05 mg/mL after 7 days of fermentation. An eco-friendly PVA-reinforced FB biodegradable film (FBBF) was successfully prepared and the effect of different plasticizers and surfactants on the mechanical, structural, and impermeability properties of the film was determined. The formation of new bonds between PVA and FB was proved by FTIR spectroscopy. The FBBF containing 0.25 % ( w/v ) glycerol and 0.01 % ( v/v ) tween-20 showed better strength properties. Elongation and water-swelling properties were highly improved by adding 0.2 % ( m/v ) citric acid. According to FE-SEM images, the smooth and tight surface of citric acid added FBBF was observed. Interestingly, the FBBF film showed good heat/moisture capacity, antifungal, and degradation properties. This report reveals a new green, and high-value recycling of straw and shrimp shell by the co-fermentation with A. pullulans and Photobacterium sp. LYM-1. It is also a novel way for the preparation of biodegradable film.
研究领域:
生物技术
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环境科学
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材料科学
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微生物学
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废物管理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Shoulu Yang,Zhongwei Wang,Zhu Liu,Yiqiang Wu
In this work, we present a simple and effective approach to enhance the fire safety and anti-corrosion performance of wood by forming in-situ self-assembled amphiphilic Ag-PW nanospheres (NSP) at room temperature. The morphology and acid capacity of the NSP were optimized by changing the ratio of phosphotungstic acid (HPW) and silver nitrate. The Ag-PW NSP were successfully integrated into the bulk of the wood, resulting in a durable treatment with minimal leaching. Comprehensive characterization techniques, including FTIR, XPS, XRD, SEM, TEM, and nitrogen adsorption–desorption analysis, confirmed the in-situ formation of Ag-PW NSP in the wood. The treatment exhibited low-leaching properties with only 5.89% of Ag-PW1a leaching out. The treated wood demonstrated excellent flame-retardant (FR) properties, as evidenced by a limiting oxygen index value > 28% and easy passage of the UL-94 test, with the formation of a high-density char layer. The flammable pyrolysis products released during combustion were found to be significantly altered, with a change in the depolymerization route of conversion of LGO under acid conditions to HMF, which was verified by DFT calculations. The treated wood also exhibited outstanding anti-corrosion properties, with a mass loss rate of less than 1%, compared to at least 32.3% for bare wood after the anti-white or brown-rot fungus tests. Moreover, the treated wood samples maintained their excellent FR properties even after leaching. Our study provides valuable insights for the rational design of nano-material additives for wood protection, thereby improving the usage of wood resources while mitigating health and environmental hazards.
研究领域:
材料科学
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化学
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木材科学与技术
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纳米技术
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产品关联
DOI
高影响因子
Foods
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2021
·Vol. 10
·期 2
·239
·
IF 4.35
Nina Bao,Di Wang,Xizhe Fu,Hujun Xie,Guizhen Gao,Zisheng Luo
LotusReceptaculum Nelumbinishas been sparking wide research interests due to its rich phenolic compounds. In the present work, ultrasonic-assisted extraction coupled with glycerol was employed to extract phenolic compounds fromReceptaculum Nelumbinisand the process was optimized using a response surface methodology with Box-Behnken design (BBD). The optimal conditions for the total phenolic content (TPC) extract were obtained: glycerol concentration of 40%, an extraction temperature of 66 °C, ultrasonic time of 44 min, and the solvent-to-solid ratio of 55 mL/g. Under these optimum extraction conditions, the extraction yield of TPC was 92.84 ± 2.13 mg gallic acid equivalents (GAE) /g. Besides, the antioxidant activities demonstrated the ability of free radical scavenging by four different methods that included 2,2-Diphenyl-1-picrylhydrazyl (DPPH), ferric reducing antioxidant power (FRAP), 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and reducing activity (RA) were 459.73 ± 7.07, 529.97 ± 7.30, 907.61 ± 20.28, and 983.66 ± 11.80 μmol TE/g, respectively. Six phenolic compounds were identified by ultra-high pressure liquid chromatography combined with triple-time-of-flight mass spectrophotometry (UPLC-Triple-TOF/MS) from the extracts. Meanwhile, Fourier transform infrared (FTIR) was conducted to identify the characteristic functional groups of the extracts and thus reflected the presence of polyphenols and flavonoids. Scanning electron microscopy (SEM) illustrated the microstructure difference of four treatments, which might explain the relationships between antioxidant activities and the structures of phenolic compounds.
研究领域:
植物化学
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分析化学
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食品科学
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天然产物研究
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Liping Mei,Zhijie Zhu,Caihong Wang,Chengyi Sun,Peirong Chen,Huimei Cai,Xu Chen,Xianfeng Du
The molecular motion of starch at different glycerol concentrations (0, 20, 50, and 80 %) was investigated using Electron Paramagnetic Resonance (EPR) spectroscopy. Fourier-transform infrared (FTIR) spectroscopy and 1 H nuclear magnetic resonance ( 1 H NMR) spectroscopy confirmed that hydroxyl groups at the C2 and C3 positions of glucose units in corn starch (CS), waxy corn starch (WCS), and high amylose corn starch (HCS) were labeled with 4-amino-TEMPO. The crystallinities of CS, WCS, and HCS after spin-labeling decreased from 30.68 % to 3.21 %, 39.36 % to 1.65 %, and 28.54 % to 8.08 %, respectively. The pseudoplastic fluid properties of the spin-labeled starch remained shear-thin at different glycerol concentrations. EPR revealed the fast- and slow-motion components of the spin-labeled starch molecules dispersed in water. At a glycerol concentration of 20 %, the slow-motion component disappeared, indicating a faster rotational motion of the starch chain segments. As the glycerol concentration increased to 50 and 80 %, the rotational motion slowed because of high viscosity. In particular, the mobility of the spin-labeled WCS chains increased owing to easier access of glycerol and water to the branched structure. This study directly observed the dynamics of the molecular behavior of starch in glycerol-water systems.
研究领域:
食品科学
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物理化学
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材料科学
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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
Meng Li,Chunxia Tang,Shaohai Fu,Kam Chiu Tam,Yongzhong Zong
The reduction and sequestration of toxic Cr(VI) via a one-step process in an aqueous solution is critical to eliminate its environmental risk. In this study, amine functionalized cellulose-based aerogel beads (CGP) was developed for simultaneous and efficient adsorption- reduction- sequestration of Cr(VI). CGP showed a maximum Cr(VI) adsorption capacity of 386.40 mg/g at 25 °C due to its strong electrostatic attraction towards Cr(VI). The simultaneous Cr(VI) adsorption- reduction- sequestration performance of CGP over a wide Cr(VI) concentration range was examined. The mechanism was investigated in-depth via the analysis of adsorption kinetics , XPS spectra, and FTIR spectra. Moreover, the Cr immobilization stability of CGP after adsorption was evaluated in simulated neutral, acidic, and alkaline conditions. The effect of pH, temperature, ionic strength and the presence of interfering ions on CGP adsorption performance were investigated by batch adsorption experiments. Fixed-bed column adsorption study was performed to explore the application potential of CGP beads in a wastewater treatment process.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2022
·
IF 5.532
Zeshuai Li,Feifei Zhou,Baosheng Xu,Donghui Guo
We present a simple way to fabricate high-entropy (La 0.2 Nd 0.2 Sm 0.2 Dy 0.2 Yb 0.2 ) 2 Zr 2 O 7 (HE-RE 2 Zr 2 O 7 ) ceramic nanofibers using the electrospinning and annealing processing in this work. The microstructure of nanofibers was characterized by thermal gravity-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. Meanwhile, the diameter and grain growth of HE-RE 2 Zr 2 O 7 nanofibers under 1000 °C was analyzed. Results indicate that HE-RE 2 Zr 2 O 7 nanofibers can be prepared at temperatures above 400 °C and the crystallite size can be controlled by annealing temperature. Both diameter and the grain growth of HE-RE 2 Zr 2 O 7 nanofibers are lower than that of La 2 Zr 2 O 7 nanofibers, attributed to the sluggish diffusion effect. The advantages of HE-RE 2 Zr 2 O 7 nanofibers can further enlarge the application of nanofibers in the aspect of high-temperature thermal insulation materials.
研究领域:
材料科学
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陶瓷
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纳米技术
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隔热材料
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Fu Li,Bin Li,Ying Zhang,Yaoping Wang,Xiaoqian Jia,Qiang Li,Jianbin Zhang
For liquid and liquid mixtures, density (ρ), viscosity (η) and surface tension (γ) are seen as important basic data. This research reported the data of ρ, η and γ for the binary mixture of tri-ethylene glycol (TEG) + 1,3-propanediamine (PDA) at p = .1 MPa and T = (293.15 to 318.15) K within the whole molar fraction range, finding the maximum of η and γ values when the mole fraction of TEG was x 1 ≈ 0.65. After that, excess molar volume ( V m E ), viscosity deviation (Δη), and surface tension deviation (Δγ) were carefully calculated, and the minimum V m E values and the maximum Δγ values were obtained when the molar fraction of TEG was at x 1 ≈ 0.50; however, the maximum Δη values shifted from x 1 ≈ 0.60 to x 1 ≈ 0.66. And then, the Redlich-Kister (R-K) equation fitting was performed on above parameters to evaluate the coefficient and standard deviation, apparent molar volumes ( V φ , 1 and V φ , 2 ) and partial molar volumes ( V 1 ¯ and V 2 ¯ ). Meanwhile, Gaussian 09 software was used to further analyze the intermolecular force and to calculate the dissociation energy and bond length of the mixture, and the interaction of PDA with TEG were discussed on the basis of FTIR, UV–Vis and FLS spectral technologies. The results showed that there were hydrogen-bond interactions between the nitrogen atoms in PDA and the hydroxyl hydrogen atoms in TEG.
研究领域:
物理化学
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计算化学
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光谱学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 9
·9278-9285
·
IF 1.798
Liu Ziyu,Xu Guangliang,Zhang Ming,Xiong Kun,Meng Pingyuan
Cobalt ferrite/reduced graphene oxide (CoFe 2 O 4 /RGO) nanocomposites were initially prepared by the interaction of alkyne-functionalized CoFe 2 O 4 NPs and azide-functionalized graphene oxide (GO–N 3 ) via the Cu (I)-catalyzed click reaction. The morphology and structure of CoFe 2 O 4 /RGO were investigated by means of XRD, FTIR, TGA, TEM, SEM and the electromagnetic parameters were measured by vector network analyzer. For CoFe 2 O 4 /RGO composites with click reaction, the minimum reflection loss could reach −40 dB at 6.8 GHz with a matching thickness of 4.0 mm, and also it had a bandwidth below −10 dB ranging from 5.8 to 8.5 GHz. The CoFe 2 O 4 /RGO composites with click reaction exhibited better microwave absorbing performance than the physical mixture. Furthermore, the covalent ligation between CoFe 2 O 4 NPs and graphene oxide could make the composites have a promising future in electromagnetic wave absorption materials.
研究领域:
材料科学
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纳米技术
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电磁材料
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化学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
·
IF 7.926
Hailin Yu,Huili Zhang,Xin Wei,Yong Chen,Bo Yu,Yingjun Wang,Hongsheng Liu
Efficient purification of oily sewage, recycling, and standard discharge have become key issues for the sustainable development of oil fields. In this study, the surface of PPFS was organically modified by a silane coupling agent . Then, covalently bonded cationic block inorganic-organic composite coagulant was prepared by chosen sodium polyacrylate as the template. This unique structure significantly enhances the positive charge and molecular chain length of the coagulant, thus improving its ability to perform charge neutralisation, adsorption bridging, and sweep coagulation. The characteristic functional groups and thermophysical properties of the composite coagulant were analysed by FTIR and thermogravimetric analysis . The transformation of random copolymers to block copolymers was determined by 1 H NMR, thus confirming the successful synthesis of the cationic block structures. The turbidity removal and oil removal properties of oily sewage were investigated by coagulation experiment. The Zeta potential , dynamic and static light scattering, and field emission scanning electron microscopy (SEM) were used to study the effect of composite coagulants on the microscopic morphology and coagulation of flocs. Finally, the coagulation mechanism of the compound coagulant was analyzed with the dynamic change of the particle size of the flocs. The cationic block structure in TP(AM-DAC-PPFS) can effectively neutralise the negative charges on the surface of impurity particles and emulsified oil. The optimal dosage of TP(AM-DAC-PPFS) was 30 mg·L −1 , at which the turbidity and oil removal rates can reach 98.3% and 93.8%, respectively.
研究领域:
环境工程
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水处理
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高分子科学
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材料科学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Tao Liu,Naisheng Guo,Xin Jin,Yiqiu Tan,Zhanping You,Shichao Cui,Zhaoyang Chu,Chenze Fang
Phase change materials (PCMs) can regulate asphalt temperature through thermal storage properties to prevent thermal damage in asphalt pavements. However, the effects of PCMs on the thermoregulation and rheological properties of asphalt require further study. In this study, polyurethane solid–solid phase change materials (PUSSPCMs) were prepared to impart thermoregulation properties to asphalt, and the effects of PUSSPCMs on the rheological properties and microscopic characterization of asphalt were investigated. The PUSSPCMs were produced by different soft segment mass fractions (70 %, 80 %, and 90 %), and they were used to prepare modified asphalt with varying contents (3 %, 5 %, and 7 %). Thermoregulation testing system, dynamic shear rheology (DSR), bending beam rheology (BBR) tests, differential scanning calorimetry (DSC), infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and atomic force microscopy (AFM) were conducted to determine the thermoregulation, rheological properties, and modification mechanism of PUSSPCM-modified asphalt, respectively. The results show that the thermoregulation property of PUSSPCM-modified asphalt improves with the increase of soft segment mass fraction and content, 7 % P90 asphalt exhibits the best thermoregulation property with the excellent delayed time (1105 s) and temperature difference (7.1 ℃). The high-temperature rutting resistance of the modified asphalt is enhanced by decreasing the soft segment mass fraction and increasing the content of PUSSPCMs, with the 7 % P70 being the best asphalt type. The 7 % P90 asphalt exhibits the optimum low-temperature creep performance due to a higher soft segment mass fraction. The modified asphalt may be a physical modification since no new characteristic peaks appear. With the increase of soft segment mass fraction, the PUSSPCMs in asphalt transform from elastomer to a ribbon-like structure. Furthermore, the microscopic roughness ( S q ) and Young's modulus of the modified asphalt decline with the increase in soft segment mass fraction and content of PUSSPCMs, implying an increase in microscopic crack resistance and a decrease in elasticity.
研究领域:
土木工程
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材料科学
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化学工程
✓ 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）