RSC Advances
·
2016
·Vol. 6
·期 54
·48737-48744
·
IF 3.289
Danfeng Hou,Jiayu Xin,Xingmei Lu,Xiaonan Guo,Huixian Dong,Baozeng Ren,Suojiang Zhang
1,4-Cyclohexanedimethanol (CHDM) is a highly valued and widely used monomer in the polymer industry. Bis(2-hydroxyethylene terephthalate) (BHET), the product of glycolysis of waste PET, is an excellent raw material for the preparation of CHDM. Herein, a series of monometallic, bimetallic and trimetallic supported catalysts were prepared for the one-pot conversion of BHET into CHDM by the impregnation method and good performance was found over trimetallic RuPtSn/Al2O3 catalysts containing various active sites to catalyze the hydrogenation of the phenyl and carbonyl groups. The influences of various reaction parameters including temperature, pressure and time on the hydrogenation reaction were studied, and 100% conversion and 87.1% yield of CHDM were obtained with the trimetallic supported catalyst with Ru/Sn 1.5. Moreover, through the comparison between various methods for the preparation of CHDM, the conversion of BHET into CHDM by the one-pot method is considered one of the most competitive methods.
研究领域:
化学工程
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材料科学
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催化反应
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DOI
高影响因子
Journal of Nanomaterials
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2020
·
IF 1.98
Dongjing Li,Ganming Li,Qing Wan,Wuxiong Xu,Jianghua Liu,Zeping Li
We study the mechanical behavior of Au nanomeshes (AuNMs) based on finite element analysis (FEA) simulation and deformation tests. The simulated results of mechanical flexibility indicate that polyethylene terephthalate (PET) substrate can release the stress of AuNMs under mechanical stretching and bending, the displacement of stretched AuNMs yields a 2% promotion, and the displacement of bent AuNMs yields a 3.5% promotion under buffering of PET substrate at 5 GPa yield strength of nanoscale Au. The stress and displacement distribution of the AuNMs/PET is demonstrated and analyzed. The further deformation tests of AuNMs under compressive and tensile loading indicate that the simulation data are in good agreement with experimental results. This paper is conducive to understanding the mechanical behavior and corresponding structural response and structural fracture dynamics of AuNMs.
研究领域:
材料科学
·
力学
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DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 15
·6133-6138
·
IF 1.821
Li-Qiang Yan,Yun Ma,Mei-Fang Cui,Zheng-Jian Qi
A coumarin-based “Turn-on” fluorescence chemosensor 1 containing L-histidine for Al3+ was readily synthesized and investigated, which showed high selectivity and remarkable sensitivity to aluminium(III) ions based on a photo-induced electron-transfer (PET) mechanism in aqueous solution (Tris–HCl, 0.1 mM, pH 7.2). The sensor responded rapidly to Al3+ in aqueous solutions with a 1 : 1 stoichiometry. Meanwhile, it showed excellent adaptability and also responsiveness.
研究领域:
分析化学
·
生物化学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hongwei Ge,Guoqiang Liu,Ranhao Yin,Zhenli Sun,Hongxia Chen,Long Yu,Pengchen Su,Mingtai Sun,Khalid A. Alamry,Hadi M. Marwani,Suhua Wang
Formaldehyde, a volatile organic compound that is ubiquitous in gas pollutants, has an indelible hazard to the health system of humans. Development of simple and convenient ways for the visual detection of formaldehyde in air is still of importance and challenging. In this paper, we report a new type of fluorescence enhancement probe (FAP), which directly exhibited fluorescence enhancement response to formaldehyde with high sensitivity and selectivity. The FAP was synthesized through the substitution reaction between hydrazine and NBD (7-nitrobenzo-2-oxa-1, 3-diazolyl) chloride, that the hydrazine group acted as both fluorescence quencher based on the photo-induced electron transfer (PET) pathway and reaction triggering factor for selectively recognizing formaldehyde. When the FAP was incubated with a formaldehyde-containing circumstance, Schiff base compound was produced by means of the aldimine condensation reaction which inhibited the PET pathway from hydrazine group to NBD, and thus turned on the fluorescence of the FAP significantly. It is worth mentioning that the FAP showed more remarkable response to formaldehyde under acid conditions. Under the optimal experimental conditions, the FAP responded linearly toward formaldehyde in a wide range of 0.015–0.8 mg•L −1 , while the fluorescence enhancement was close to 30 times. This FAP was successfully used to detect gaseous formaldehyde in indoor air.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Jin-Tao Du,Hao Wu,Yao Jie,Yi Xia,Zhenyu Yang,Hong Yan,Qian Wang,Jie-Xin Wang,Jian-Feng Chen
Efficient and sustainable recycling of polyethylene terephthalate (PET) is essential in mitigating its environmental impacts on climate, human health, and global ecosystems. Glycolysis, a closed-loop recycling method that converts PET into bis(2-hydroxyethyl) terephthalate (BHET), stands out as one of the most promising methods due to its mild operating conditions and environmentally friendly nature. However, the complete convert PET into BHET with a high stability are still challenging. In this study, magnetically recyclable CoFe 2 O 4 nanocatalysts were synthesized by the solvothermal method and surface-modulated with Na 3 Cit·2H 2 O as a modifier. When utilizing an optimized CoFe 2 O 4 catalyst, conversion of PET achieved 100 %, with a BHET yield of 91.7 % at 210 °C for 1 h. The excellent catalytic performance of CoFe 2 O 4 is attributed to its smaller particle size, improved dispersion, higher surface Co/Fe ratio, and increased oxygen vacancies, all of which can be achieved through straightforward surface modulation. DFT calculations of M−O distance (M = Co or Fe), adsorption energy, and Bader charges confirm that a higher surface Co/Fe ratio enhanced PET glycolysis, consistent with experimental results. Additionally, a modified energy economy coefficient ( ε m ) was proposed to characterize the catalytic efficiency. The ε m value of CoFe 2 O 4 -60 % was 0.624, indicating promising applications in efficient PET glycolysis. This work presents a versatile approach for easily manipulating the surface properties of magnetic catalysts and identifies key factors for achieving high performance in PET-to-BHET conversion. It offers valuable guidelines for the future design of nanoparticle catalysts with magnetic properties for chemocatalytic reactions.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2024
·
IF 3.7
Jiaojiao Sun,Yaxing Pang,Ziyi Lei,Bo OuYang,Wanxian Lai,Yonghua Wang,Dongming Lan
Advancing the efficiency of polyethylene terephthalate (PET) degradation is pivotal for sustainable and versatile PET recycling. In this study, we initially screened eight esterases , pinpointing Pyrobaculum calidifontis VA1 esterase (PCEST) as markedly effective in decomposing PET intermediate products. Building on this discovery, we engineered fusion proteins combining a robust cutinase (HRC) with PCEST, connected by flexible glycine-serine linkers. We further optimized the linker length, the sequential arrangement and the enzymatic conditions of the conjugated enzymes . Notably, the synergistic activity of the HRC-PCEST fusion protein significantly enhanced the breakdown of PET, thereby promising to streamline recycling processes. Collectively, this methodology not only propels the efficiency of PET degradation but also broadens the horizons for sustainable and versatile PET waste management protocols.
研究领域:
生物化学
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环境科学
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材料科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Zishuai Wang,Yu Jin,Yaoqiang Wang,Zequn Tang,Shaojie Wang,Gang Xiao,Haijia Su
Due to the antibiodegradable properties, numerous plastics have been accumulated in the ecosystem and aggravate ecological pollution. Poly (ethylene terephthalate) (PET) is among the most used plastics. Glycolysis of PET is a useful approach to solve the waste PET pollution and obtain bis(2-hydroxyethyl) terephthalate (BHET). In this paper, waste PET was efficiently depolymerized through glycolysis catalyzed by cyanamide. In particular, compared with the previously reported catalyst, cyanamide is more readily available and can be used directly in catalysis without a complex preparation process. Under optimal conditions, PET was completely depolymerized with up to nearly 100% BHET yield. Even at a temperature as low as 150 °C, a good BHET yield can be obtained. The application potential of this glycolysis procedure was demonstrated by its excellent performance in the glycolysis of various real PET wastes like transparent and opaque PET samples and polyester foam and by the high quality of the obtained BHET products. The mechanism was studied by 1H NMR analysis, and DFT calculations showed that the higher activity of cyanamide than its trimer, melamine, is due to the stronger hydrogen bonds formed between cyanamide and PET or ethylene glycol.
研究领域:
环境科学
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材料化学
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催化反应
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 8
·333
·
IF 3.5
Zhang Xinxing,Ma Luxiang
A novel Schiff Base as a flame-retardant monomer (FSB, 5-((3,5-bis(trifluoromethyl) benzylidene) amino) isophthalic acid) with -CF 3 was designed and used to synthesize FSB n PETs (PET copolyester) by copolymerization, which shows good flame retardancy and anti-dripping. The introduction of the –CF₃ group increases the cyclization temperature of the FSB Schiff base unit by suppressing the cyclization reaction through its strong electron-withdrawing effect, which is 350–398 °C, higher than 250–348 °C from the PET copolyesters modified by Schiff Base without -CF 3 , indicating that FSB n PETs exhibits a broadened processing temperature window. And FSB also increased the glass transition temperature (Tg), reduced the melting temperature (Tm) and the crystallizability of FSB n PETs. FSB n PETs possessed good flame retardancy and anti-dripping properties, FSB 10 PET (7.4 mol% of FSB) owned V-0 level of UL-94 and 31% value of LOI without dripping phenomenon. The bond of -C-F had not broken into the air phase to make an obvious influence on the flame retardancy property of FSB n PETs, whose flame retardancy mechanism is still type of the condense flame retardancy. Additionally, in the new preparation process for FSB n PETs, the dicarboxylic acid structure of FSB could speed up the condensation polymerization between the BHET precursors, which could save 50% of the preparation time, showing an exciting economic advantage. The -CF₃ modified Schiff base (FSB) is an effective modifier for PET copolyesters, offering improved processing performance and good flame-retardant properties.
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 4.7
Qi Liu,Chenghao Wang,Ping Li,Mingming Deng,Shengbin Zhou,Lin Luo,Boyi Fu,Chi Huang
Textile dyeing remains a major environmental challenge due to its high water and chemical consumption. Herein, we presented a scalable antireflective coating (ARC) strategy to enhance color performance while reducing dye usage in poly(ethylene terephthalate) (PET) fabrics. By thermally reshaping poly(methyl methacrylate-co-glycidyl methacrylate-co-trifluoroethyl methacrylate) (PMGF) terpolymer nanoparticles into subwavelength-structured microlenses on PET, the resulting ARC minimized reflection through multiscale light trapping. The optimized ARC-coated PET exhibited a 29.49% increase in color yield (I %) with negligible chromatic deviation compared to pristine PET. The coated PET also exhibited high colorfastness, ensuring long-term durability. Notably, pilot-scale tests confirmed the excellent process stability and reproducibility of this approach. Additionally, the ARC coating demonstrated the potential to impart a deeper color to fabrics with reduced dye consumption. Furthermore, the technique demonstrated universal applicability across diverse hues (blue, black, and green), offering an enhanced coloration performance. The mechanisms of color management, based on selective light reflection, were elaborated, showing that the micro-nano-structure, morphology, and refractive indices collectively contributed to the desired color appearance by manipulating the interaction between visible light and PET fabric.
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2026
·
IF 8.1
Xiaolong Hu,Guowei Liu,Erlei Yu,Yan Xie,Rui Hu
Polyethylene terephthalate (PET) has a limiting oxygen index (LOI) of only approximately 21%, and it burns readily with severe dripping and heavy black smoke. Phytic acid, which carries six phosphate groups and up to 28 wt% phosphorus, promotes efficient dehydration and charring. Its poor thermal stability and strong acidity, however, prevent it from surviving the melt processing window of PET (260–290 °C). This constitutes the fundamental obstacle to using phytic acid as a melt-blending flame retardant for PET. To overcome this barrier, we employed aqueous coordination between phytic acid and LaCl 3 ·6H 3 O at 80 °C. The resulting lanthanum phytate complex (PALa) possesses a highly cross-linked coordination architecture that confers sufficient thermal stability for PET processing. Subsequent oxidative self-polymerisation of dopamine coated the PALa surface, yielding a PDA-coated flame retardant (PALa@PDA). The polydopamine shell improves filler-matrix compatibility and mitigates the severe embrittlement that rigid fillers ordinarily cause. The PET/5PALa@PDA composite, prepared by melt blending, retains an elongation at break of 345.9%, effectively preserving the ductility of the PET matrix. Its LOI rises to 27.2%, with immediate self-extinguishing after the first ignition, and total smoke release is substantially reduced. The char residue at 800 °C reaches 19.1%, a 59.2% increase over neat PET. This work demonstrates that constructing a thermally stable coordination architecture can enable phytic acid-based flame retardants to meet the processing requirements of high-temperature polyesters.
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Xiaoying Zhang,Ranran Wei,Zhihan Zhang,Yaxuan Li,Zekai Shen,Ruichen Geng,Yinglong Wang,Junmei Zhang,Shuli Yin
With the worsening of plastic pollution and increasing attention being paid to sustainable development, the upgrading and recycling of waste plastics have become important tasks. In this study, organic ligand-modified PdPr nanosheets (PdPr O-NSs) with the lanthanide contraction effect are constructed and used as high-performance electrocatalysts for the value-added transformation of polyethylene terephthalate. PdPr O-NSs only require a potential of 0.75 V to supply current densities of 200 mA cm −2 . The Faraday efficiency and selectivity for the primary product glycolic acid reached 97.5% and 94.6% at 0.675 V, respectively. Density functional theory calculations confirm that the existence of Pr and n -octanoic acid adjusts the electronic structure and coordination environment, improving the electron transfer efficiency and catalytic performance. This work not only provides a new strategy for constructing novel and efficient lanthanide-doped nanomaterial electrocatalysts but also paves the way for recycling waste plastics.
研究领域:
材料科学
·
环境化学
·
纳米催化
·
可持续发展
·
高分子化学
·
电化学
·
资源循环利用
·
理论计算化学
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产品关联
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2018
·Vol. 10
·期 3
·329-336
·
IF 2.917
Tong Xinru,Zhao Zhuo,Wu Junsheng,Zhou Yanwen,Kelly Peter,Gao Peng
The formation of GaN/graphene hybrid films through the vacuum thermal evaporation of GaN on a double layer flexible substrate consisting of a graphene layer on PET, has been studied. The thicknesses of the GaN layers and, therefore, the structure and properties of the hybrid films,
were critically influenced by the deposition time. The structure of the GaN layer on graphene was amorphous, according to small angle X-ray diffraction spectra. The existence of the GaN layer on top of the graphene and the absence of a N–C covalent bond at the interface of the GaN/graphene
hybrid film was confirmed by using Fourier transform infrared spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The free π-electrons of graphene took the conductive role in the hybrid films. A slight change in electrical properties was observed with increasing
thickness of the GaN layer, due to the shunt resistance between this layer and the graphene layer. The grain size of the GaN films increased and transmittance within the visible range decreased with increasing deposition time, i.e., increasing thickness. The method presented demonstrates the
feasibility of realizing transparent conductive GaN/graphene hybrid films on flexible PET, which are in high demand for fabricating optoelectronic and sensing devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
薄膜沉积
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DOI
高影响因子
危险品化学品经营许可证（带存储）