APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Fengqin Guo,Liguo Wang,Yan Cao,Peng He,Huiquan Li
A series of Mg 3 Al 1−x Ce x O composite oxide catalysts were prepared by co-precipitation for the transesterification of ethylene glycol to ethylene carbonate. The characterization results revealed that the addition of cerium changed the acid-base properties of the catalyst and that the strong basic sites on the catalyst surface played an important role in the reaction. The Mg 3 Al 0.9 Ce 0.1 O catalyst showed the highest catalytic activity (ethylene carbonate yield 98.1%). Compared with pure Mg-Al oxide, the appropriate addition of Ce was conducive to improving the surface basicity and adsorbed oxygen content of the catalyst. Additionally, the reaction process of the formation of ethylene glycol hydroxyl group with the alkoxy anion formed by the catalyst attacking the carbonyl carbon of nucleophilic dimethyl carbonate to form an adsorption intermediate (HEMC) on the catalyst surface for further intramolecular rearrangement to form ethylene carbonate was confirmed by operando infrared spectroscopy. The reaction kinetics shows that the reaction conforms to the second-order kinetic equation, and the activation energy is 53.71 kJ·mol −1 . Catalytic stability in a fixed-bed reactor was studied. After a long cycle of use (150 h), the yield of ethylene carbonate was stabilized at about 89.0%.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2023
·
IF 1.8
Haonan Dong,Zhe Huang,Baishan Chen,Panzhen Li,Chenhe Zhang,Yunzhu Ma,Wensheng Liu,Siwei Tang
The exceptional qualities of silver nanocubes make them ideal for diverse applications in healthcare, electronics, energy, and environmental protection. Studying their growth morphology is crucial for precise synthesis control, property optimization, and sustainable production methods.In this paper, silver nanocubes were prepared through the reduction of silver nitrate using polyvinylpyrrolidone and sodium chloride as additives, with ethylene glycol and polyethylene glycol serving as reducing agents and solvents. The size and shape of these nanoparticles are significantly influenced by the concentration of the precursor and the amount of water in the reaction mixture. These two factors play distinct roles in altering the nucleation and growth processes of the silver nanocubes. Specifically, the precursor concentration determines the rate of nucleation, thus impacting whether the nanoparticles grow through coalescence or Ostwald ripening. Conversely, the water content modulates the reduction rate of silver ions, which in turn dictates whether the reaction occurs under thermodynamic or kinetic control. This investigation enhances our comprehension of the nucleation and growth mechanisms associated with silver nanocubes and provides valuable insights for the one-pot synthesis of uniformly-sized silver nanoparticles, extending beyond the realm of silver nanocubes.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2024
·
IF 3.7
Wenjing Liu,Kexin Qiang,Peipei Ye,Xin Li,Xiaoman Zhao,Jianhan Hong,Yafeng Duan
Polyethylene terephthalate (PET) fabric was enzymatically modified with polyethylene glycol (PEG). Lipase from Aspergillus oryzae was used as a catalyst. The wetting behavior of the modified PET fabric was characterized by the water contact angle , water adsorption dynamics and moisture regain. The initial water contact angle of the modified fabric decreased from 129.3° to 74.9°. The water absorption dynamics results indicated that the equilibrium water absorption amount of the modified fabric was approximately 10 times greater than that of the untreated sample. The initial absorption rate ( V init ) of the modified fabric was almost 30 times higher than that of the untreated fabric. The moisture regain reached 3.52 % after modification. Scanning electron microscopy revealed granular and sheet coatings on the surface of the modified fabric. Chemical linkage of PEG onto the PET fibers was confirmed by attenuated total reflection–Fourier transform infrared spectroscopy. The modification had no significant effect on the thermal properties of the PET fabrics according to the thermogravimetric curve and differential scanning calorimetry results. The mechanical properties of the modified fabric were slightly improved. Therefore, in situ enzymatic transesterification between PET and PEG could be a potential novel modification approach for adding value to PET fiber textiles .
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Shengya Ge,Chenzhang Li,Peiyan Bi,Wei Hong
The operation of direct ethylene glycol fuel cells (DEGFCs) to generate electric energy from ethylene glycol rely on the effective electrocatalysts for the ethylene glycol oxidation reaction (EGOR). The fabrication of EGOR electrocatalysts with high activity, high durability and high resistance for corrosion, is essential important for the DEGFCs. Herein, we report a fabrication of Pd nanoparticles immobilized by the Ce-doped ZIF-67-derived carbon (Pd-CeO 2 /ZDC). The Pd nanoparticles are generated by the in-situ reduction reaction between the H 2 PdCl 4 and the Co nanoparticles formed during the ZIF-67 pyrolysis. Owe to the porous structure and N-doping inherited from the ZIF-67, the Pd and CeO 2 nanoparticles show a uniform distribution. Due to the enhanced EGOR electrooxidation kinetic promoted by the ZIF-67-derived support, the multiple-components and structure synergies, the resultant Pd-CeO 2 /ZDC catalyst affords a EGOR current density of 32.4 mA cm -2 , which is higher than the commercial Pd/C as well as the counterpart Pd/ZDC catalyst without CeO 2 . Furthermore, the Pd-CeO 2 /ZDC catalyst also present a better EGOR durability. This work provides a strategy for the design of EGOR catalyst with multiple-components and desired structure, which may inspire the new tactics for controllable design and synthesis of other electrocatalysts for various electrocatalysis.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Zhang Luyao,Wang Li,Chen Junliang,Li Jinzhou,Huang Peng,Nie Xinming,Yang Jianping
Due to the shortage of rational waste management, plastic waste has become increasingly serious, posing a serious threat to the environment and humans. The catalytic oxidation of polyethylene terephthalate (PET) waste has been reported to reduce environmental stress and produce valuable products. However, obtaining valuable chemicals from waste plastics under mild conditions driven by specific reactive oxygen species is a great challenge. Herein, N, P-doped Mo 2 C@porous carbon was designed and employed in the peroxymonosulfate-based advanced oxidation reforming of PET hydrolysate. The ethylene glycol (EG) derived from PET fiber was catalytically oxidized to formate via singlet oxygen activation during the peroxymonosulfate-based advanced oxidation process. Compared with Mo 2 C, the N, P-doped Mo 2 C@porous carbon catalyst with a large specific surface area provides more active sites, which has the characteristic of high catalytic activity. It presents the tetracycline degradation efficiency of ~ 80% under a wide pH range (6.8–10.6) and, further, the formate generation rate of ~ 56.5 mmol g cat −1 in the advanced oxidation reforming process of EG in 8 h. The detection and quenching experiments on the oxygen active species comprehensively confirmed that singlet oxygen is the key reactive oxygen species during the advanced catalytic oxidation reactions. This work provided a constructive demonstration for designing advanced oxidation catalysts to catalyze the reforming of waste PET fiber plastics into valuable chemicals. Graphical The catalytic reforming of polyethylene terephthalate (PET) waste and proper treatment of fiber-based microplastics have emerged as critical areas of research and innovation to alleviate environmental stress and generate valuable products. This work sheds light on the efficient Mo 2 C@porous C catalyst design via singlet oxygen activation for persulfate-based advanced oxidation reforming of EG from PET fiber waste, providing a potential countermeasure to address plastic waste pollution and achieve carbon neutrality
研究领域:
环境科学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Zhisong Li,Linbo Wu
Poly(ethylene 2,5-furandicarboxylate) (PEF) is an important biobased polyester with better thermal, mechanical, and gas barrier properties than poly(ethylene terephthalate). In PEF synthesis, diethylene glycol furandicarboxylate (DF) is inevitably formed via etherification side reaction. Taking advantage of the side reaction, poly(ethylene-co-diethylene furandicarboxylate) (PEDF) poly(ether-ester)s were synthesized only from 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG), using a cheap binary propanedisulfonic acid/dibutyltin oxide (PSA/DBTO) catalyst. The polymers were characterized by 1 H NMR, intrinsic viscosity, solubility, differential scanning calorimetry, thermogravimetric analysis, tensile, and gas barrier test. Due to strong acidity of PSA, not only major DF but also minor oligoethylene glycol furandicarboxylate ether-containing units were formed. Their total content can be adjusted up to 78 mol% by simply increasing the dosage of PSA from 0 to 0.4 wt%. The effect of ether-containing units on the solubility, thermal transition, mechanical, and oxygen barrier properties of the poly(ether-ester)s were examined and compared with the poly(ether-ester)s synthesized via copolycondensation.
研究领域:
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
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xin Wei,Weizhong Zheng,Xiaofeng Chen,Jingwen Qiu,Weizhen Sun,Zhenhao Xi,Ling Zhao
The glycolysis is one of the most promising chemical ways for the disposal of waste Poly(ethylene terephthalate) (PET) due to the relative mild conditions. However, several serious issues still remain to be solved, including complex monomer purification, elusive product components, and ambiguous depolymerized mechanism. Herein, the depolymerization-repolymerization strategy of PET with ethylene glycol (EG)/cyclohexane-1,4-dimethanol (CHDM) binary mixed alcohols was proposed to prepare the value-added Poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG/PCTG). Based on the one-pot depolymerization-repolymerization process, a series of amorphous PETG/PCTG with high molecular weight ( M n > 25,000 g/mol) and glass transition temperature can be prepared. The controlled depolymerization of PET into oligomers with higher molecular weight is of great importance to obtain high molecular weight PETG copolyesters according to the hierarchical process. The depolymerization mechanism of PET with mixed EG/CHDM was deeply elucidated, in which EG depolymerizes PET chains into the short ones, and CHDM undergoes transesterification with ester group on the end group of BHET monomers and oligomers with different molecular weight to substitute the ethylene glycol terephthalate (ET) units into 1,4-cyclohexanedimethanol terephthalate (CT) units. For post-consumer PET, the depolymerization-repolymerization of colorless PET bottle can form the r PETG with higher intrinsic viscosity, molecular weight, and thermal properties, superior to the PET film and colored bottles. The information in this work is of great importance for the upcycling of PET waste.
研究领域:
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Bin Xiao,Mingyuan Zheng,Jifeng Pang,Yu Jiang,Hua Wang,Ruiyan Sun,Aiqin Wang,Xiaodong Wang,Tao Zhang
Using biomass-derived ethylene glycol (bio-EG) to synthesize poly(ethylene terephthalate) (PET) is of notable significance for alleviating the dependence on fossil energy resources. Bio-EG readily contains a small amount of miscellaneous diols, which derive from the side reactions in the catalytic conversion of biomass. To disclose the effects of miscellaneous diols on the synthesis and properties of PET, EG feedstock containing four 1,2-diols, i.e., 1,2-propylene glycol, 1,2-butanediol, 1,2-pentanediol, and 1,2-hexanediol at 0–10% concentrations was used for the synthesis of PET. The molecular weights, intrinsic viscosities, and thermal and mechanical properties of obtained PET materials were measured. It was found that when the overall content of miscellaneous diols in EG was lower than 5%, the molecular weights and thermal properties of the prepared PET materials were very similar to that of PET synthesized from pure EG. The miscellaneous diols were less likely to be incorporated into PET resin because of the steric hindrance of the alkyl group in diols to the esterification and polycondensation reactions. Instead, they preferred to undergo dehydration reactions to form low-boiling-point aldehydes and hemiacetals, which could be removed from the reaction system during the reactions. Three bio-EG samples at purities of 99.9, 98.5, and 95.8 wt % were used for the bio-PET synthesis. Transparent and colorless bio-PET samples were obtained, demonstrating that the presence of miscellaneous diols does not have negative effects on the color quality of PET. The physical properties of bio-PET prepared with bio-EG at a purity of higher than 98 wt % were nearly the same as those of PET derived from pure EG. At a lower bio-EG purity of 95.8 wt %, the tensile strength of the obtained bio-PET sample was slightly decreased. The comprehensive results of property characterization show that bio-PET materials prepared with bio-EG at purity higher than 95 wt % could be used as widely as the conventional petro-PET resin without notable deterioration in their performance.
研究领域:
材料科学
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化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Junyan Wu,Qingqing Zhao,Diandian Shi,Yiguo He,Zhen Miao,Haijiao Xie,Dianyu Wang,Shuzhuang Sun,Yadong Zhang
The ubiquitous use of plastic has resulted in an undeniable global impact on the environment. Glycolysis of polyethylene terephthalate (PET) is a promising plastic recycling approach, but the use of heavy metal catalysts may pose tremendous risks to both our environment and human health. In this work, we developed a method for in-situ generation of alkali metal catalysts, which generated magnesium alcohol (MgEG) through ligand exchange between acetylacetone and ethylene glycol (EG). By optimizing the reaction conditions, we achieved complete conversion of PET bottle flakes at 180 ℃ and obtained a bis(2-hydroxyethyl) terephthalate (BHET) yield of 85.9%. The structural characterization and density functional theory calculations demonstrated that EG in magnesium alcohol formed a quaternary ring with carbonyl group, reducing the reaction energy barrier. Moreover, this catalytic strategy exhibited reasonable catalytic activities on colored PET, PET mixed with other plastics and various polyesters, indicating the considerable potential for degradation of polyesters using non-heavy metal catalysts.
研究领域:
环境科学
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材料科学
·
催化化学
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产品关联
DOI
高影响因子
Pharmaceutics
·
2018
·Vol. 10
·期 4
·230
·
IF 3.746
Xingzheng Liu,Rongrong Fan,Boting Lu,Yuan Le
Methoxy-poly(ethylene glycol)-poly(l-glutamic acid)-poly(l-phenylalanine) triblock polymers with different architecture were synthesized as drug carrier to obtain sustained and controlled release by tuning the composition. These triblock polymers were prepared by ring opening polymerization and poly(ethylene glycol) was used as an initiator. Polymerization was confirmed by1H NMR, FT-IR and gel penetration chromatography. The polymers can self-assemble to form micelles in aqueous medium and their critical micelle concentrations values were examined. The micelles were spherical shape with size of 50–100 nm and especially can arranged in a regular manner. Sorafenib was selected as the model drug and the drug loading performance was dependent on the composition of the block copolymer. In vitro drug release indicated that the polymers can realize controlled and sustained drug release. Furthermore, in vitro cytotoxicity assay showed that the polymers were biocompatible and the drug-loaded micelles can increase toxicity towards tumor cells. Confocal fluorescence microscopy assays illustrated that the micelles can be uptaken quickly and release drug persistently to inhibit tumor cell growth.Keywords:methoxy-poly(ethylene glycol);polypeptide;methoxy-poly(ethylene glycol)-poly(l-glutamic acid)-poly(l-phenylalanine);micelles;drug delivery
研究领域:
高分子化学
·
药物递送系统
·
肿瘤治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Hui Yang,Chaonan Tao,Lincai Peng,Junhua Zhang,Liang He,Huai Liu
It remains a challenging task for the efficient conversion of carbohydrates to value-added chemicals at concentrated feedstock solution. In this contribution, the acid-catalyzed processing of high-concentration C5/C6 sugars (180 g/L) in the ethylene glycol (EG) solvent system was investigated, and prominent discrepancy was noticed between C5 and C6 sugars. A large amount of liquefied products was achieved in the concentrated C6 sugars EG solution, whereas the main products in the case of C5 sugars were found to be solid humins. The reaction mechanism studies revealed that EG can shelter fructose and reaction intermediates (5-hydroxymethylfurfural and levulinic acid) from the cross-polymerization and self-etherification reactions, thereby reducing the generation of solid humins during the fructose liquidation process. However, in the case of xylose, the copolymerization between EG and furfural (FF) generates a solid resin, thus rendering a high solid product yield. Moreover, the produced FF–EG resin was found to be a polymer with high molecular weight formed by connecting the furan ring and the alkyl structure through an ether bond. This finding provides insights into the acid-catalyzed conversion of concentrated C5/C6 sugars in EG, facilitating rationally designed processes for the valorization of concentrated carbohydrates.
研究领域:
化学工程
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生物化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hao Dong,Bo Wang,Xiandong Hao,Jinyu Wang,Zhiyong Xu,Wenbo Zhao
Seeking top-performing absorbents with excellent structural stability and renewability to realize efficient removal of H 2 S from natural gas is of great importance. Here, the H 2 S absorption thermodynamic and kinetic properties by a non-aqueous liquid binary blend of monoethanolamine (MEA) and ethylene glycol (EG) was systematically studied. The addition of solvent EG not only improves the thermal stability but also reduces the viscosity of the system especially after H 2 S absorption. The absorption mechanism was revealed by the combination of experimental characterization and Density Functional Theory (DFT) calculations, which show that the absorption process is a proton transfer reaction. In addition, a quasi-primary kinetic model was used to describe the absorption kinetic behavior, with rate constants increasing with temperature and pressure. Reaction equilibrium thermodynamic model (RETM) fitting thermodynamic results showed that the enthalpy (ΔH) and entropy (ΔS) of the interaction of the absorbent with H 2 S was −40.72 kJ/mol and −114.71 J/mol/K, respectively. Most importantly, the optimum absorption temperature was calculated to be 287.80 K and the optimum desorption temperature was 386.62 K. Moreover, the desulphurization rate was verified to increase with decreasing temperature and increasing H 2 S partial pressure. Five cycles of absorption-desorption experiments were conducted at 313.15 K for absorption and 373.15 K for desorption in order to verify the good reuse properties of the absorbent. Considering the excellent thermal stability, low viscosity after H 2 S absorption, acceptable absorption capacity as well as good reversibility, it is believed that the MEA/EG blend has a significant potential in the field of desulfurization.
研究领域:
化学工程
·
环境科学
✓ 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）