JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yuqi Tang,Mingzhao Zhu,Junhong Chen,Xuebiao Sun,Huan Li,Zhijie Hu,Suman Li,Qian Qu,Zejun Zhang,Yuanzhu Mi
The petroleum industry produces a large volume of water-in-oil (W/O) emulsion annually, which has detrimental consequences for both the industry and the environment. Therefore, effective demulsification of these emulsions is crucial. In current work, a low-temperature demulsifier (EBTA) for W/O emulsions was synthesized using PET waste plastic as starting materials through a simple method. Chemical structure of EBTA was characterized by FT-IR and 1 H NMR. The demulsification performance was assessed using bottle-test method, and a comprehensive examination was conducted on the influence of EBTA concentration, settling time, temperature, pH value, and salinity on the demulsifying efficiency (DE). At a low temperature of 40 ℃ and a concentration of 250 mg/L, EBTA achieved a DE of 95.36% in an Emul30 emulsion, while a DE of 100% could be obtained in an Emul70 emulsion. Furthermore, EBTA demonstrated excellent tolerance for salts, acids and alkalis. In addition, the demulsification mechanism of EBTA was investigated using various techniques, such as interfacial tension (IFT), zeta potential, three-phase contact angle and coalescence time of droplets. The results revealed that EBTA had a lower IFT and was easily adsorbed on the oil–water interface. This led to the damage of the interface film and facilitated the oil–water separation. Due to the simple and safe synthesis process and remarkable demulsification performance, EBTA is a promising demulsifier for separating W/O emulsions.
研究领域:
環境科學
·
石油化工
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 6
·1338
·
IF 4.2
Zhi Qu,Lin Zhang,Yan Sun
PETase exhibits a high degradation activity for polyethylene terephthalate (PET) plastic under moderate temperatures. However, the effect of non-active site residues in the second shell of PETase on the catalytic performance remains unclear. Herein, we proposed a crystal structure- and sequence-based strategy to identify the key non-active site residue. D186 in the second shell of PETase was found to be capable of modulating the enzyme activity and stability. The most active PETaseD186Nimproved both the activity and thermostability with an increase inTmby 8.89 °C. The PET degradation product concentrations were 1.86 and 3.69 times higher than those obtained with PETaseWTat 30 and 40 °C, respectively. The most stable PETaseD186Vshowed an increase inTmof 12.91 °C over PETaseWT. Molecular dynamics (MD) simulations revealed that the D186 mutations could elevate the substrate binding free energy and change substrate binding mode, and/or rigidify the flexible Loop 10, and lock Loop 10 and Helix 6 by hydrogen bonding, leading to the enhanced activity and/or thermostability of PETase variants. This work unraveled the contribution of the key second-shell residue in PETase in influencing the enzyme activity and stability, which would benefit in the rational design of efficient and thermostable PETase.
研究领域:
生物化学
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酶学
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塑料降解
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分子生物学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2012
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IF 2.103
Xiaolei Nie,Hong Wang,Jing Zou
Direct synthesis of silver conductive film on PET substrate by inkjet printing silver citrate conductive ink was presented in this paper. This kind of conductive ink contained silver citrate as silver precursor, 1,2-diaminopropane as complex agent dissolving the silver salt and methanol and isopropanol as a media adjusting the viscosity and surface tension. The formation of silver-amine complex reduced the decomposition temperature from 180 °C to 135 °C, thus the ink could be cured at relatively low temperature. The film reached the lowest resistivity of 17 μΩ cm after cured at 150 °C for 50 min, 3.1 μΩ cm at 230 °C and possessed high reflection and excellent adhesive property. Electrical conductivity, surface morphology and composition were investigated by four-point probe method, scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). It is demonstrated how the cured condition affects the silver film. Moreover, radio-frequency identification (RFID) antenna was fabricated by inkjet printing, which opens up routes for the flexible electronics fabrication.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Xiang-Dong Liu,De-Kun Sheng,Xiu-Mei Gao,Tong-Bing Li,Yu-Ming Yang
A facile and highly efficient method for adhesion improvement of PET/TPU laminates was introduced. A considerable improvement in adhesion was achieved by treating PET fabric with isocyanate (MDI) in toluene solution. Compared with unmodified ones, the maximal peel strength reaches to 2.27 kN/m (up to three times). The fabrics were also treated with NaOH and CDT (corona discharge treatment) and the results were compared respectively. It is considered that the improvement mainly depends on the strengthening of chemical bonding and mechanical interlocking between the fiber and the adhesive matrix. As the difference directly affects the effective transference of the stress (tension force) from matrix to fiber. The failure surface of PET fiber was severely destroyed which could be examined by scanning electron microscopy (SEM).
研究领域:
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
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Jiajun Tao,Cheng Ji,Shan Jiang
In this study, core-shell carbon microspheres (CMSs-PZS) were synthesized by coating polyphosphazene (PZS) on the surface of carbon microspheres (CMSs) through one-step polymerization, and they were characterized using infrared spectroscopy and electron microscopy tests. CMSs-PZS were added to polyethylene terephthalate (PET) to prepare flame-retardant PET composites. The effects of CMSs-PZS on the flame retardancy, thermal stability, and mechanical properties of the composites were investigated. The results showed that the introduction of CMSs-PZS into PET significantly enhanced the flame-retardant properties. When the content of CMSs-PZS was 3 wt%, the limiting oxygen index (LOI) value of PET/CMSs-PZS increased to 33.4%, achieving a UL-94 V-0 rating. Thermogravimetric (TG) analysis showed that the initial decomposition temperature of PET composites increased, while the decomposition rate decreased, and the amount of residual carbon increased with the addition of CMSs-PZS. Cone calorimeter test data showed that the peak heat release rate (pk-HRR) of PET/3wt%CMSs-PZS decreased to 450.67 kW/m 2 , and the total heat release (THR) decreased to 22.14 MJ/m 2 . It is shown that during the combustion process, CMSs-PZS decomposes to form a charcoal layer covering the surface of PET, which plays the role of heat and oxygen insulation, effectively inhibiting the combustion of PET and its heat release during the combustion process.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2025
·
IF 5
Cui Panpan,Ge Chao,Shi Sheng,Zhang Meiling,Su Qianyu,Hou Wensheng
The production and disposal of polyester fibers have been rapidly increasing, highlighting the urgent need for green and efficient recycling technologies to promote fiber resource circularity. Although the conventional alkaline hydrolysis method for polyester offers a simple process, its reliance on strong alkaline media and high-temperature conditions leads to severe equipment corrosion, high energy consumption, and significant secondary pollution risks, greatly limiting its large-scale application. In this study, an innovative ethanol-sodium carbonate (EtOH-Na₂CO₃) synergistic catalytic system was developed. By leveraging the cooperative effects of an organic–inorganic hybrid solvent, PET was efficiently depolymerized under mild conditions. The results indicate that when the alcohol-to-water ratio was optimized to 1:1 (v/v), the catalyst loading (Na₂CO₃/PET) was set at 2:3 (w/w). The reaction was conducted at 150 °C for 105 min; PET was completely converted, achieving a terephthalic acid (TPA) yield of up to 98%, five times higher than that of traditional non-alcoholic systems. Moreover, this method was also applicable to colored polyester fibers, producing TPA that met industrial-grade standards. These findings demonstrate the great potential of this approach for large-scale applications. This study not only elucidates the synergistic catalytic mechanism of the organic–inorganic hybrid solvent system but also establishes a technological bridge from fundamental research to industrial application. It provides an innovative strategy for the closed-loop management of chemical fibers. It offers a novel solution for the high-value recovery of complex fiber waste, thereby facilitating the deep integration of green chemical processes and circular economy models. Graphical
研究领域:
化学工程
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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
Molecular Catalysis
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2022
·
IF 5.089
Ji Wang,Shuqing Zhang,Yiming Han,Lilei Zhang,Qingyin Wang,Gongying Wang,Xiaoming Zhang
PET (poly(ethylene terephthalate)) is one of the most important type of thermoplastic polyesters and widely used in various fields. Titanium-based catalysts are environmentally friendly and have higher catalytic activity than antimony-based catalysts when used in industry. However, titanium-based catalysts are prone to hydrolysis and result in discolored products. UiO-66 (Zr/Ti) with different Ti 4+ contents were successfully synthesized via one-step method. The material was characterized by XRD, SEM, FT-IR, XPS, BET and TG techniques. The results demonstrates that Ti 4+ was integrated into the UiO-66 framework. NH 3 - in situ DRIFTS, pyridine-IR, and NH 3 -TPD were used to explore the acidic properties of the samples, which proved that stable Lewis acidic sites are present in the samples even at 300 °C. The catalytic performance of UiO-66 (Zr/Ti) containing different Ti 4+ was explored under different conditions. At the same time, the scale-up experiment was carried out in a 5 L reactor, and the PET chips obtained had a lower b value. The catalytic reaction mechanism of UiO-66(Zr/Ti) was demonstrated by DFT calculations and the catalytic performance was close to Sb-based catalysts.
研究领域:
材料科学
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化学工程
·
催化
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DOI
高影响因子
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
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2024
·
IF 2.5
Di Hua,Hongjie Xi,Quan Xie,Shuyue Cai,Yuxuan Zhou,Xin Hu,Ling Qiu,Jianguo Lin
Legumain is overexpressed in diverse tumors, serving as a significant tumor biomarker. Our study aimed to develop a new positron emission tomography (PET) probe [ 68 Ga]Ga-NOTA-SF-AANM for imaging the expression level of legumain in vivo . The radio-labeling of [ 68 Ga]Ga-NOTA-SF-AANM was accomplished within 15 min. The probe has good stability in vitro . NOTA-SF-AANM exhibited rapid response to recombinant human legumain enzyme, enabling intramolecular condensation cyclization. Cellular uptake and lysosomal co-localization experiments demonstrated that the probe was able to differentiate specifically between MDA-MB-468 and PC-3 cancer cells with varying degrees of legumain expression. PET imaging displayed a significant and persistent signal (3.59 ± 0.30 %ID/mL at 60 min) in MDA-MB-468 tumors, while PC-3 tumors exhibited lower radioactivity (1.08 ± 0.35 %ID/mL at 60 min), further validating the specific targeting of [ 68 Ga]Ga-NOTA-SF-AANM towards legumain. [ 68 Ga]Ga-NOTA-SF-AANM is a promising tool for precise diagnosis of legumain-related diseases due to its advantages in radio-labeling and accurate monitoring of legumain expression levels.
研究领域:
医学影像学
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分子生物学
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肿瘤学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Shaoan Cheng,Yangxi Li,Zhen Yu,Yuqing Su
Adsorption can be used as a pollutant removal method to solve the increasingly serious problem of synthetic dye pollution and metal organic framework (MOF) is considered as a novel adsorbent for its unique structure. However, the high cost and high toxicity during the synthesis procedure of MOFs like MIL-101(Cr) limited their potential on the large-scale production and application. In this paper, waste PET plastic was depolymerized to prepare terephthalic acid (TPA) as an organic linker to synthesize MIL-101(Cr). Besides, Hydrofluoric acid (HF) was not added during the synthesis to avoid poisonous pollution. MIL-101(Cr) was applied to the adsorption of anionic dyes reactive red 2 (RR2) and reactive blue 19 (RB19). The batch experiments exhibited kinetic data best fitted the pseudo-first-order model (PFO) with the adsorption capacity of 662.87 (RR2) and 863.67 mg g -1 (RB19). The isotherm adsorption data fitted well with the Freundlich isotherm, indicating formation of multilayer coverage over the surface of MIL-101(Cr). The highest regeneration rate of MIL-101(Cr) at the fourth cycle was 91.18 and 91.44 % after RR2 and RB19 adsorption. X-ray photoelectron spectroscopy (XPS) technique and Fourier Transform Infrared (FTIR) spectroscopy both indicated the possible adsorption mechanism of MIL-101(Cr) toward RR2 and RB19 could be attributed to electrostatic interactions, hydrogen bonding, and the π-π stacking. This work proposed a novel method using waste plastics as raw materials to synthesize eco-friendly pollutant adsorbent, which had an enlightening effect on pollutant treatment.
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
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Zhiqiang Jiang,Dongxia Yan,Jiayu Xin,Fei Li,Mengquan Guo,Qing Zhou,Junli Xu,Yufeng Hu,Xingmei Lu
The methanolysis of polyethylene terephthalate (PET) was investigated using poly(ionic liquid)s (PILs) synthesized with 1-vinyl-3-ethylimidazole acetates ([VEIm]Ac) and acrylic acid metal salts, and the activities of the PILs were screened. The effects of reaction temperature, reaction time, methanol amount, catalyst amount and PET sources on the methanolysis of PET were investigated using the optimized catalyst PIL-Zn 2+ . Under the optimal conditions the conversion of PET was 100% and the yield of dimethyl terephthalate (DMT) was 89.1%. In addition, the catalyst has very good applicability for methanolysis of different PET raw materials. More importantly, the PIL-Zn 2+ catalyst could be recycled by simple filtration after the reaction, and could be reused six times without significant decrease in PET conversion and DMT yield. The catalysts were analyzed by TGA, FT-IR, XRD and ICP before and after recycling, the results showed no change in the structure of the catalyst, reflecting the good stability of the catalyst. The reaction kinetics of PIL-Zn 2+ was first-order with an activation energy of 107.6 kJ/mol. This work mainly provides a way to design efficient, stable and recyclable catalysts for PET methanolysis.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Ruiqi Zhang,Panpan Hao,Xiujie Cheng,Rana R. Neiber,Ling Wang,Yi Li,Junli Xu,Dongxia Yan,Qing Zhou,Jiayu Xin,Xingmei Lu
Ionic liquids (ILs) have been recognized as environmentally friendly and effective catalysts for poly (ethylene terephthalate) (PET) glycolysis. However, further investigation is required to gain a deeper understanding of the depolymerization mechanism. In this study, a series of experiments are conducted to investigate the impact of metallic and non-metallic ILs, containing diverse anions, on the interaction with PET surfaces. The findings indicate that the catalytic efficiency of IL is strongly correlated to the intensity of the interaction with PET. When the interface adhesion strength is more than twice that of PET/PET, the IL exhibits efficient catalytic properties in PET glycolysis. Therefore, an innovative approach involving the use of AFM for efficiently assessing highly effective IL catalysts is proposed. In addition, attenuated total reflectance Fourier transform-infrared (ATR-FTIR) spectroscopy and density functional theory (DFT) calculations further demonstrate the predominant interaction mechanism between ILs and PET. This research provides guiding significance for understanding the mechanism of PET glycolysis.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 24
·47653
·
IF 2.188
Jinsheng Zhou,Lin Ye,Yanming Lin,Ling Wang,Li Zhou,Huiyuan Hu,Qilong Zhang,Hui Yang,Zhongkuan Luo
To improve the antifouling property, polyvinyl alcohol hydrogel was successfully grafted with [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide (MEDSAH) via photoinduced electron transfer–reversible addition–fragmentation chain transfer (PET-RAFT) polymerization under a 10 W blue (450–460 nm) light-emitting diodes. It is surprising that the reaction could be performed in the presence of oxygen, which meant that the reaction has a great prospect of industrialization. The highest grafting percentage (GP) was 55.77% by adding triethylamine and changed the MEDSAH usage in the absence of oxygen. Thermal gravimetric analysis exhibited that grafted MEDSAH affects the thermal property of PVA hydrogel. Also, there was no influence on the ultraviolet–visible transmittance, and the PVA-g-pMEDSAH hydrogel became hydrophilicity after grafting. Moreover, in vitro cytotoxicity of both PVA and PVA-g-pMEDSAH hydrogel was noncytotoxic according to ISO 10993-2009. The antifouling property of PVA-g-pMEDSAH hydrogel was increased about 53.05%. Thus, the PVA-g-pMEDSAH hydrogel can be an ideal optical biomaterial candidate. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47653.
研究领域:
材料科学
·
生物医学工程
✓ 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）