COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Kun Jiang,Kun Liu,Qian Peng,Muyang Zhou
Montmorillonite (MMT) and humus have a good adsorption effect on heavy metal ions . This study proposed a synthetic method for a novel composite of humus-like substances/MMT (HLS-MMT) by introducing humus precursors into the interlayer domain of MMT and then forming HLS through in situ catalytic polycondensation reaction. The structure and morphology of samples were characterized by XRD , FTIR, and SEM , which demonstrated the successful loading of HLS on the internal and external surfaces of MMT. The experimental results showed that the loading of HLS on MMT was very stable, and the adsorption capacity of the modified MMT for lead and zinc ions was greatly enhanced. The effects of single-factor experiments showed that the pH value was the key factor affecting the adsorption process . In addition, the adsorption process was found to be in good agreement with the Langmuir isotherm model and the pseudo-second-order kinetic model . The competitive adsorption experiment displayed that HLS-MMT had a higher affinity for Pb ions than Zn ions, and the cycling experiment presented that the adsorbent had good regeneration and cycling performance. This study shows that HLS-MMT is a novel adsorbent with a good capacity to separate and enrich Pb and Zn ions similar to ion-exchange resin.
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
高影响因子
Food Packaging and Shelf Life
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2020
·
IF 4.244
Chang Liu,Jiao Huang,Xuejing Zheng,Shujie Liu,Kuakua Lu,Keyong Tang,Jie Liu
The present study aimed to develop heat sealable soybean polysaccharide (SSPS)/gelatin blend films intended to be used as edible food packaging materials. The films were fabricated by solution casting method using SSPS/gelatin blends and plasticized by glycerol. The results indicated that the heat sealability, stretchability and resistance to fracture of the films were significantly improved by blending SSPS with gelatin. The incorporation of gelatin into SSPS films also increased the thermal stability but decreased the water solubility, rigidity and water vapor permeability of the films. ATR-FTIR spectra and DSC results indicated strong interactions between SSPS and gelatin. The studies of optical properties, SEM, AFM, and XRD revealed that SSPS and gelatin were compatible to a certain degree in this blend system. Packaging tests confirmed that the blend films have showing potential as edible material in food packaging.
研究领域:
食品科学
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材料科学
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高分子科学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Yuchun Ji,Zhengde Li,Laiping Zhang,Jilin Wang,Wenbiao Li,Wenzhuo Chen,Guoyuan Zheng,Fei Long,Zhengguang Zou
In this paper, a novel boron nitride hollow microtube (BNHM) structure by annealing assisted high-pressure etching method. The products were characterized by XRD , FTIR, Raman, XPS , SEM, TEM, TGA , BET, UV–vis, and PL. The result shows that the sample displayed a one-dimensional hollow tube structure directionally covered with nanosheets . The average inner diameter of the hollow tube is 1 µm with a length of 2–4.5 µm. And the wall thickness of the hollow tube structure is about 100 nm. In addition, the band gap value of the sample is 5.51 eV presenting the strongest absorption peak at 225 nm. The specific surface area of the sample is 272.6 m 2 ·g −1 , showing good adsorption efficiency on Congo red (absorbed 75% in 5 min). Meanwhile, the possible growth mechanism of BNHM is also discussed.
研究领域:
材料科学
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纳米技术
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化学
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表面科学
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产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2023
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IF 10.7
Fuyun Ji,Huihui Liu,Chuyan Wang,Na Guo,Yizhong Shen,Shuizhong Luo,Shaotong Jiang,Zhi Zheng
Curcumin (Cur) and (−)-Epigallocatechin gallate (EGCG) have synergistic bioactivity in several terms, but their polar differences and environmental sensitivity make co-utilization challenging. Soy protein fibrils (UF) have sparked broad attention as outstanding carriers for bioactive substances. In this study, EGCG was applied to remodel the structure of Cur-loaded UF complex (UFC) to form novel UF-based hydrogels co-encapsulated Cur and EGCG (UFCE). The fluorescence spectroscopy, ITC , and FTIR analysis demonstrated that EGCG absorbed and deposited on the surface of UFC through hydrophobic and electrostatic interactions. The binding of EGCG led to the formation of UFCE, which constructed a stable and uniform gel network during heat treatment. UFCE gels formed with varying EGCG/protein concentration ([E]/[F]) ratios showed different structural properties with different encapsulation effects. At 2.5% protein concentration, UFCE gels formed at [E]/[F] ratio of 0.08 (UFCE 0.08 ) exhibited better gelling properties. The encapsulation efficiency of Cur and EGCG in UFCE 0.08 gel was up to 97.71% and 91.02%, respectively. Moreover, UFCE 0.08 gel exhibited significantly enhanced stability of Cur (95.27%) and EGCG (70.27%) than that of free Cur (53.13%) and free EGCG (13.32%) after thermal treatment at 85 °C for 120 min. UFCE 0.08 gel was also effective in improving the UV light stability of Cur (88.70%) and EGCG (72.96%). Furthermore, the binding of EGCG had pronouncedly boosted the anticancer activity of Cur in the UFCE 0.08 gel against Caco-2 cells. This study provides new perspectives into the fibril-polyphenol hydrogel systems for the co-encapsulation of EGCG and Cur, which has substantial potential for health-promoting applications.
研究领域:
材料科学
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药学
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生物技术
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食品科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 26
·期 4
·917-927
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IF 2.747
Zhang Lang,Chang Shiying,Lu Xingjie,Han Tao,Jin Ruoheng,Zhao Tenglong,Fang Dong,xie Ming,Wang Mingjun,Yi Jianhong
Vanadate-based synthesis of battery electrodes has become a topic of research interest due to the high lithium storage performance. However, the rapid capacity decay seriously hinders its practical application. In order to improve the potential for Co 3 V 2 O 8 (CVO) as an electrode in lithium batteries, a Na 5 V 12 O 32 nanowire precursor with a smooth surface was obtained using the hydrothermal method. Next, the CVO nanowires assembled by nanosheets were fabricated by cation exchange from the Na 5 V 12 O 32 precursor. Finally, the elemental phosphorus-coated CVO was successfully synthesized by a custom furnace. The characterization of X-ray diffraction (XRD) and inductively coupled plasma emission spectroscopy (ICP-ES) quantified the ratio of P and CVO, and Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) revealed the presence and coverage. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) further demonstrated the existence and morphology of P and CVO. Meanwhile, electrochemical measurements illustrated the stable lithium storage and notable rate performance of the P-CVO electrode as compared to AN-CVO. The P-CVO electrode holds a higher stable cycle performance after 190 cycles, with discharge specific capacity of 415.3 mA h g −1 and capacity retention of 97% at a current density of 1.0 A g −1 (872 mA h g −1 , 2.0 A g −1 , 98.8%), versus AN-CVO with 320.6 mA h g −1 (capacity retention of 79.5%) after only 100 cycles. Thence, the synthetic strategy provides a potential solution to enhance the stability of electrodes for high-performance lithium-ion batteries.
研究领域:
材料科学
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电化学
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能量存储
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DOI
高影响因子
Energies
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2019
·Vol. 12
·期 19
·3726
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IF 2.707
Wenxin Dong,Xiaolin Pu,Biao Ma
The major low molecular inhibitors showed inhibition in the hydration of clay in the laboratory for water-based drilling fluids, according to the principle of intercalation adsorption. However, inhibitors have failed and caused serious engineering accidents in drilling oil and natural gas. This paper investigated the transmission of several of drilling fluids to indicate whether low molecular inhibitor for drilling can effectively inhibit the wellbore hydration. The inhibition of drilling fluid with the plugging of mud cakes, was significantly weakened based on the hydration expansion of cores and cutting recoveries. The residual contents of inhibitors were determined with the precolumn derivation of high-performance liquid chromatography (HPLC) analysis and were chartered with Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) analysis in the structure of the derivative. The clogging behavior of the mud cake was described by environmental scanning electron microscopy (ESEM). Experiments show that 40 wt% to 90 wt% by weight of the corrosion inhibitor cannot pass through the mud cake in the dynamic filtration of the drilling fluid. The mud cake can be further divided into a nanostructure layer, a homogeneous layer and an anisotropic layer with different permeability. Most inhibitors should be limited to the nanostructure layer and the homogeneous layer.Keywords:low molecular inhibitors;drilling fluids;mud cake;plugging
研究领域:
石油工程
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化学工程
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 13
·5822-5828
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IF 3.591
Yingwu Wang,Qiang Lin,Ping Ning,Chi Wang,Heping Zeng,Xin Sun,Xin Song,Kai Li
H2S and PH3, which are ore-thermal furnace gases, are harmful to humans and the environment. Here, the performance of a catalyst, Ce–Cu–Al trimetallic composite catalyst, is further explored by examining the influence of the used acid. The effects of acids on the structural features, surface functional groups, and activity of the catalysts were examined. Test results showed that the catalyst fabricated using 71.7 mmol nitric acid performed the best, and its capacity reached 229.8 mg g−1 (H2S) and 201.9 mg g−1 (PH3). Besides, SEM and TEM showed that the whole structure of catalysts was sharply changed by the species of the acid used, which was caused by the different combinations of components in the catalyst system. Because of the change in the catalyst structure, their physical and chemical properties are also adjusted. Using nitric acid could endow the catalyst with better properties, such as the best specific surface area, higher total pore volume, the strongest acid center, and the best reducing power. Combining the analysis results of FTIR spectroscopy, it was found that the detailed functional groups of NH2− and νON played a role in the reaction.
研究领域:
催化
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环境化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Zhen Liu,Heng Xu,Zhijie Fan,Xiandie Zhang,Xuxu Cui,Jie Ji,Haozhe Li,Xiaode Guo
Self-healing materials have not been able to solve the problem of the coexistence of mechanical strength and self-healing function. Despite years of research, high-strength self-healing materials still require external factors to accelerate their self-healing process. For this reason, in this study, two kinds of chain extenders were inserted into the hard segment to design the molecular structure of polyurethane. The introduction of two chain extenders not only provided multiple binding modes for hydrogen bond recombination, but also formed more types of hydrogen bonds. Based on the design, a polyurethane elastomer PUGI-D 3 B 2 with high strength and excellent self-healing properties was synthesized. Data such as FTIR and 1 H NMR spectra clearly demonstrate the successful synthesis of PUGI-D 3 B 2 . The mechanical strength of PUGI-D 3 B 2 is 15.34 MPa, and its surface scratches can completely disappear after self-healing at 60°C for 10 h，and 98.02% of the mechanical strength is restored after 12 h of heal. Therefore, combining the excellent self-healing properties of PUGI-D 3 B 2 , we prepared a multifunctional superhydrophobic material (SHN-SiO 2 /PUGI-D 3 B 2 ). It can be used in a wide range of applications such as waterproof coatings, biomedicine and flexible electronics, which provides a new idea for the future direction of multifunctional materials.
研究领域:
材料科学
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高分子化学
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表面科学
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产品关联
DOI
高影响因子
FUEL
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2022
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IF 8.035
Xiaodong Wang,Xiaoran Li,Sen Liu,Haofei Zhou,Qiuye Li,Jianjun Yang
Cis-9-Octadecenylamine modified α-Fe 2 O 3 and Fe(OH) 3 nanoparticles were successfully synthesized by using a one-step synthetic method. XRD results revealed that lower ratio of oleylamine to Fe 3+ introduce forming hematite phase but higher ratio introduce forming Fe(OH) 3 phase. FTIR, TGA, contact angle, and XPS results indicated that olelyamine were modified on the surface of α-Fe 2 O 3 or Fe(OH) 3 . A larger amount of oleylamine modifier is conducive to the dispersion of the catalysts in heavy oil. Oleylamine modified Fe(OH) 3 can be transformed into α-Fe 2 O 3 in situ during the catalytic reaction and shows higher catalytic activity in the viscosity reduction of Shengli extra heavy crude oil.
研究领域:
化学工程
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材料科学
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石油工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Rui Liu,Yingzhang Shi,Linghui Lin,Zhiwen Wang,Cheng Liu,Jinhong Bi,Yidong Hou,Sen Lin,Ling Wu
Ultrathin Bi 2 WO 6 nanosheets with a high concentration of surface oxygen vacancies (BWO-OVs) are successfully constructed for the degradation of levofloxacin (LVX) under visible light irradiation and show a high degradation efficiency of LVX (≈100 %). It is revealed that the oxygen vacancies (OVs) over BWO-OVs nanosheets can not only accelerate the separation of photo-induced electrons and holes, but also activate the O 2 molecules to form O 2 – species. The FTIR spectra and density functional theory deeply demonstrate that piperazine ring and C O groups (carboxylic acid) in LVX can be chemisorbed and activated by surface Lewis acid sites. The EPR results reveal that photo-generated holes, O 2 – and OH species are reactive oxygen species for the photocatalytic degradation of LVX. The possible intermediate is well investigated by LC-MS results combined with the FTIR spectra results. This work provides a new perspective for understanding photocatalytic degradation from the interaction between the active sites of a photocatalyst and antibiotics molecules.
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
JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Lulu Liu,Yuxuan Liu,Xiangrong Chen,Shichao Feng,Yinhua Wan,Hongwei Lu,Jianquan Luo
Membrane fouling is inevitable during nanofiltration of industrial liquids. Understanding the influence of membrane physicochemical properties and structures on its antifouling performance can guide the membrane selection and preparation. In this study, the antifouling ability of three commercial nanofiltration membranes (NF270, NFA4 and DK) was assessed using organic foulants with different charge patterns. Besides, the pristine and fouled membranes were systematically characterized. The results showed that although the negatively charged polyamide membrane had a strong antifouling ability to negatively charged substances, the fouling extent was still affected by the membrane pore size distribution . For the small foulants with positive charge, driven by electrostatic adsorption effect, they were easier to be anchored on the membrane surface with higher roughness. Due to the synergistic effect of membrane charge and roughness, the flux decay ratio increased from 5.1% for the NFA4 to 63.1% for the DK with more negative charge and highest roughness. Moreover, according to FTIR, XPS deep profiling and SEM cross-section analysis, it was found that the structure of the separation layer (e.g., single/double layer or cross-linking density in horizontal/longitudinal) closely related to its antifouling performance. Therefore, a nanofiltration membrane with narrow pore size distribution, moderate charge, smooth and hydrophilic surface is more prone to resist organic fouling formation. The outcomes of the work also offer several strategies to prepare antifouling nanofiltration membranes.
研究领域:
膜科学
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环境工程
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材料科学
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产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 1
·111
·
IF 2.467
Hongda Chen,Jihui Wang,Aiqing Ni,Anxin Ding,Xia Han,Ziheng Sun
In order to improve the efficiency of intumescent flame retardants (IFRs), a novel macromolecular charring agent named poly(ethanediamine-1,3,5-triazine-p-4-amino-2,2,6,6-tetramethylpiperidine) (PETAT) with gas phase and condense phase synergistic flame-retardant capability was synthesized and subsequently dispersed into polypropylene (PP) in combination with ammonium polyphosphate (APP) via a melt blending method. The chemical structure of PETAT was investigated by Fourier transform infrared spectroscopy (FTIR), and1H nuclear magnetic resonance (NMR) spectroscopy. Thermal properties of the PETAT and IFR systems were tested by thermogravimetric-derivative thermogravimetric analysis (TGA-DTG) and thermogravimetry–Fourier transform infrared spectroscopy (TG-FTIR). The mechanical properties, thermal stability, flame-retardant properties, water resistance, and structures of char residue in flame-retardant composites were characterized using tensile and flexural strength property tests, TGA, limiting oxygen index (LOI) values before and after soaking, underwritten laboratory-94 (UL-94) vertical burning test, cone calorimetric test (CCT), scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDXS), and FTIR. The results indicated that PETAT was successfully synthesized, and when the ratio of APP to PETAT was 2:1 with 25 wt % loading, the novel IFR system could reduce the deterioration of tensile strength and enhance the flexural strength of composites. Meanwhile, the flame-retardant composite was able to pass the UL-94 V-0 rating with an LOI value of 30.3%, and the peak of heat release rate (PHRR), total heat release (THR), and material fire hazard values were considerably decreased compared with others. In addition, composites also exhibited excellent water resistance properties compared with traditional IFR composites. SEM-EDXS and FTIR analyses of the char residues, as well as TG-FTIR analyses of IFR were used to investigate the flame-retardant mechanism of the APP/PETAT IFR system. The results indicated that the efficient flame retardancy of PP/IFR composites could be attributed to the synergism of the free radical-quenching and char layer-protecting mechanisms in the gas phase and condense phase, respectively.
研究领域:
材料科学
·
高分子化学
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消防安全工程
·
分析化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）