JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Zhengyu Hou,Hejuan Pan,Mengjie Gu,Xiaowang Chen,Tongtong Ying,Pei Qiao,Junwei Cao,Haixia Wang,Tong Hu,Lianbao Zheng,Weihong Zhong
Phthalate esters (PAEs) are widely used as plasticizers and cause serious complex pollution problem in environment. Thus, strains with efficient ability to simultaneously degrade various PAEs are required. In this study, a newly isolated strain Rhodococcus sp. AH-ZY2 can degrade 500 mg/L Di-n-octyl phthalate completely within 16 h and other 500 mg/L PAEs almost completely within 48 h at 37 °C, 180 rpm, and 2 % (v/v) inoculum size of cultures with a OD 600 of 0.8. OD 600 = 0.8, 2 % (v/v). Twenty genes in its genome were annotated as potential esterase and four of them ( 3963 , 4547 , 5294 and 5359 ) were heterogeneously expressed and characterized. Esterase 3963 and 4547 is a type I PAEs esterase that hydrolyzes PAEs to phthalate monoesters. Esterase 5294 is a type II PAEs esterase that hydrolyzes phthalate monoesters to phthalate acid (PA). Esterase 5359 is a type III PAEs esterase that simultaneously degrades various PAEs to PA. Molecular docking results of 5359 suggested that the size and indiscriminate binding feature of spacious substrate binding pocket may contribute to its substrate versatility. AH-ZY2 is a potential strain for efficient remediation of PAEs complex pollution in environment. It is first to report an esterase that can efficiently degrade mixed various PAEs.
研究领域:
微生物学
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环境科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yijie Liu,Jichi Zhang,Yuan Ji,Jiawei Cao,Sen Xu,Peng Luo,Jianpeng Liu,Lina Ma,Guolin Gao,Yadong Wu,Zaixing Jiang
3D printed polyurethane elastomers (PUEs) have gained widespread application across diverse fields due to their versatility and adaptability. However, in comparison to traditional PUEs manufacturing, 3D printed variants often exhibit inferior mechanical properties, rendering them susceptible to physical and chemical damage during use. This vulnerability significantly impacts their service life and overall reliability. Herein, we designed self-healing PUEs with reversible boronic ester bonds covalent adaptive network (3DP-PUE-xA) as igital light processing three-dimensional (DLP 3D) printing materials. A novel photocurable functional monomer (ABDBA) with boronic ester bonds as a dynamic crosslinker was synthesized. Complex structure was divided into DLP printable simple parts, successfully acquired through self-healing assembly. The optimal 3DP-PUE-3A possessed excellent self-healing property of 107.73 ± 5.29 %. Simultaneously, the damaged 3D printed structures could be restored to their original structure and function by heat treatment, greatly extending their service life. This study provided a crucial research direction for advancing the applications of self-healing materials and enhancing 3D printing technologies within the realms of materials science and manufacturing engineering.
研究领域:
材料科学
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制造工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
·
IF 7.1
Lulu Dong,Tiefeng Xu,Junming Dai,Wenxing Chen,Wangyang Lu
Under dual pressures of energy scarcity and environmental pollution, the biobased polyester poly(ethylene furanoate) (PEF) is poised to dominate the industry in the future, overtaking conventional petroleum-based polyesters. Nonetheless, PEF discoloration is a critical impediment to its commercial success. Esterification reaction of 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG) was developed at varying temperatures, yielding esterified products exhibiting varying degrees of discoloration. The main compounds and minor impurities in all esterified samples were accurately separated and identified using ultrahigh-performance liquid chromatography/high-definition mass spectrometry (UPLC-HDMS) techniques. The chemical structure of the yellowing component was determined by secondary mass spectrometry (MS/MS), Fourier transform infrared (FTIR) spectrometry, and a nuclear magnetic resonance (NMR) spectrometer. It can be concluded that different forms of decarboxylated byproducts were produced during esterification and polycondensation, which resulted in the discoloration of PEF. At the same time, decarboxylated byproducts were also present in alcoholysis products of commercial brown PEF chips but absent in alcoholysis products of commercial white PET chips. These results clearly demonstrate a direct relationship between PEF discoloration and decarboxylation. Overall, this work offers theoretical support and insights for future research into PEF discoloration, establishing a solid foundation for further development and application.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
ChemPlusChem
·
2024
·
IF 3
Meng-Ge Wei,Hong-Ru Li,Liang-Nian He
Graphical A series of solid base KF/Mg-Fe bi-metal oxides were fabricated via supporting KF on Mg-Fe bi-metal oxides and calcination. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afford up to 88 % yield and 97 % selectivity toward DMC in the optimal conditions. It is worth noting that the catalyst can be easily separated by filtration and reused. A series of KF/Mg-Fe oxides were fabricated via the solid-state reaction between KF and Mg-Fe oxides. Especially, when 20 wt % KF was supported on the Mg-Fe bi-metal oxides and calcined at 400–600 °C, the solid material with more basic sites than the support itself was obtained. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afforded up to 88 % yield and 97 % selectivity toward DMC in 2 h under reflux conditions with the molar ratio of methanol to ethylene carbonate set at 8. It is worth noting that the catalyst was easily separated and reused, retaining at least 89 % catalytic activity during the first four recycles. Although an attenuated activity was still observed due to the inevitable filtration loss and dissolution, this solid base can still provide clues to the development recyclable catalyst in green synthesis of DMC.
研究领域:
化学工程
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绿色化学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Lei Chen,Yuan Niu,Cuihong Liu,Runhong Fan,Peng Liu,Dongxu Ma,Xiaoqing Zhang,Chengzhi Liu,Huigao Duan
Transfer printing enables the fabrication of flexible electronics by transferring devices from donor to receiver substrates. However, using an elastic stamp can cause strain and damage during transfer. A rigid stamp can solve this issue, but rigid materials are unsuitable for flexible electronics. In this study, we present a transfer approach using a UV-curable polyurethane acrylate film as a stamp with solvent-induced mechanical properties, from rigidity to elasticity. During the transfer, the UV-curable film is tuned to be rigid to prevent damage to the transferred materials caused by strain during peeling. The approach enables the intact transfer of metallic structures, including various multi-scale Ag patterns with the highest resolution of 10 μm, high transfer yield, and scalability. The interfacial mechanisms of metal transfer were analyzed. The results demonstrate that surface modification through increasing contact angles, improve the stability of metal transfer. When soaked in ethanol, the film becomes soft and elastic, making it an ideal flexible substrate for fabricating electronics, especially for applications in sensing, healthcare, and artificial skin.
研究领域:
材料科学
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柔性电子学
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微纳制造
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2024
·
IF 6.3
Tong-Yu Bai,Xiang-Xin Xiao,Guan-Qi Zheng,Qin Zhang,Zi-Ni Wang,Li Chen,Bo-Wen Liu,Yu-Zhong Wang
Polycarbonate is a widely used engineering plastic material, but its limited flame retardancy has restricted its application in high-end fields such as aviation and railways. In this study, we propose a novel copolymerization/macromolecular blending strategy to produce a high-performance, fire-safe polycarbonate composite. By copolymerizing with polydimethylsiloxane oligomer and blending with macromolecular polyarylate, the resulting PC-BPDMS 5 /PITR successfully achieved a UL-94 V-0 rating and a high limiting oxygen index value of 34.2%. The peak heat release and total smoke release were significantly reduced by 45.2% and 27.4%, respectively, compared to pure PC. SEM, Raman, and XPS analyses confirmed the condensed-phase dominated flame-retardant mechanism, attributed to the char-forming ability of the polyarylate and polydimethylsiloxane segments. Polydimethylsiloxane segments can decompose to produce small molecules such as methane, and the left structure with silicon, which undergo cross-linking reactions with the substrate during combustion to promote char formation. The polyaromatic ring structure of PITR can also participate in the formation of a dense and stable char layer. The excellent compatibility between the polyarylate and the PC matrix, combined with the superior flexibility of polydimethylsiloxane, allowed the composite to maintain mechanical properties comparable to pure PC. Additionally, the increased molar volume resulted in a low dielectric constant for PC-BPDMS 5 /PITR. This work presents a promising approach for the development of high-performance polycarbonate composites.
研究领域:
材料科学
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聚合物化学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xianjie Li,Bingxiao Feng,Hailin Zhang,Yaping Liu,Meng Xiao,Tingting Huang,Quanhong Zhu,Hongbing Song
Furfural, a key biomass-derived compound, can be transformed into high-value chemicals, including methyl furoate, through oxidative esterification. This process finds broad applications across various industries. In the current study, gold nanoparticles were deposited on γ-Al 2 O 3 pretreated with NaOH etching, utilizing the urea deposit-precipitation method followed by reduction in a hydrogen atmosphere. This approach resulted in a highly active Au catalyst, which was thoroughly characterized using multiple analytical techniques. The optimization of NaOH etching enhanced the pore structure and improved the dispersion of the active metal on the support. Notably, the Au/γ-Al 2 O 3 -2 catalyst, prepared with a 2-hour etching duration using 1 M NaOH, exhibited uniformly dispersed gold nanoparticles with an average size of 2.8 nm. The smaller particle size and enhanced dispersion of these Au nanoparticles significantly contributed to the catalyst’s superior catalytic activity and recyclability. Under optimized reaction conditions, the Au/γ-Al 2 O 3 -2 catalyst achieved nearly complete conversion of 1 mmol of furfural to methyl furoate within 4 h, with both conversion and selectivity exceeding 99 %. The study also proposed a mechanism for the oxidative esterification of furfural to methyl furoate catalyzed by Au/γ-Al 2 O 3 -2. Additionally, the catalyst’s effectiveness in the oxidative esterification of various substrates was investigated, demonstrating its robust activity for aromatic aldehydes and alcohols. This broadens the potential applications of the catalyst in the synthesis of diverse valuable esters.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
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2025
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IF 13.1
Ruiqi Fang,Jie Kang,Fengliang Wang,Xin Zhao,Yingwei Li
The production of valerate esters, a class of transportation biofuels (additives), usually undergoes alternate hydrogenation and acid-catalysis dehydration processes that suffer from inevitable coke deposition and undesirable side reactions. We report a one-pot esterification–hydrogenolysis reaction pathway for valeric biofuels synthesis from biomass-derived 2-furoic acid, which was proceeded over the elaborate CoPtX@Co3O4-NC (X = 0.01, 0.02, 0.05, and 0.1) catalysts. The catalysts were constructed through a MOF-engaged etching-pyrolysis-replacement strategy to obtain mesoporous pocket cube nanoboxes-in-nanobox morphology and uniform CoPtX@Co3O4 core–shell nanoparticles with Pt moieties in tunable content and size (from single-atom scale to 2.4 nm). The obtained acid-free CoPtX@Co3O4-NC catalyst achieved an average 92.2% yield of ethyl valerate at a complete conversion of 2-furoic acid, and the reaction ran steadily in a microchannel continuous flow reactor for at least 200 h, which also inhibited the byproduct generation and coke deposition. A mechanistic study suggested that 2-furoic acid was preferably adsorbed on the oxyphilic Co3O4 shell for esterification initially; then the generated esters underwent sequential and exclusive hydrogenolysis steps over the CoPt core to yield valerate esters. The high industrial application prospect of this reaction pathway was additionally highlighted by producing 12 kinds of valeric biofuels from 2-furoic acid and the corresponding C1 ∼ C7 primary, secondary, and tertiary alcohols.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
POLYMER
·
2024
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IF 4.1
Yu Gu,Jiahao Liu,Wei Gao,Meichen Liu,Chunwang Yi
The preparation of polyesteramides (PEAs) with regular block structure has long been a challenge, owing to the occurrence of the ester-amide exchange during the polymerization at high tempereture. In this work, we report a simple and green method to prepare polyamide 6 (PA6) based triblock PEA whose structure is poly(ε-caprolactone)-block-PA6-block-poly(ε-caprolactone) (PCL- b -PA6- b -PCL) using tetraphenyl tin as catalyst without solvent. The first segment PA6 was synthesized via cationic ring-opening polymerization (ROP) of ε-caprolactam (CPL), later, ROP of ε-caprolactone (CL) was involved to extend polycaprolactone (PCL) segments by using tetraphenyl tin as catalyst. By varying the proportion of CPL and CL, series PA6-based PEAs was prepared and characterized by gel permeation chromatography, 1 H, DOSY, and 13 C NMR. The results showed that PEA containing more proportion of CL presented a higher molecular weight with narrow polydisperse index. In particular, the lower water absorption and lower oligomers content infers that the PEA could have a prospective application in processing precision electronic devices.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2016
·Vol. 37
·期 2
·113-123
·
IF 0.631
Jing Sun,Huagao Fang,Haili Wang,Shanzhong Yang,Shengrong Xiao,Yunsheng Ding
Waterborne epoxy-modified polyurethane-acrylate (EPUA) dispersions with nano-sized core-shell structure particles, with polyacrylate (PA) as core and epoxy-modified polyurethane (EPU) as shell, were successfully prepared via a two-step procedure. The waterborne EPU dispersions were first synthesized to serve as seeds, and then the butyl acrylate (BA) and methyl methacrylate (MMA) monomers were introduced into EPU particles to form polymeric core by radical polymerization under the assistance of ultrasonic treatment. Fourier transform infrared (FT-IR) spectroscopy revealed that the epoxy and PA components were successfully incorporated onto the chain of the PU and EPU to form EPU and EPUA, respectively. The transmission electron microscopy (TEM) photograph demonstrated that the EPUA particles have the core-shell structure. The as-prepared EPUA coating films exhibited good thermo-stability and mechanical properties, as revealed by thermogravimetric analysis (TGA) and tensile testing, respectively. The results of potentiodynamic polarization curves and immersion corrosion testing in 5 wt% NaCl aqueous solution both demonstrated that the anticorrosive properties of EPUA mainly depended on the mass content of PA, with the optimized value of 30 wt%.
研究领域:
材料科学
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化学工程
·
高分子材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuanfeng Wu,Xianghai Song,Fufeng Cai,Guomin Xiao
A series of Ce-NiO catalysts prepared by co-precipitation method were tested for glycerol transesterification with diethyl carbonate (DEC) to produce glycerol carbonate (GC). The microstructural and physicochemical properties of the catalysts were determined by XRD , XPS , SEM, EDX, CO 2 -TPD, N 2 -adsorption, FT-IR, and TG-DTG. The results showed that the particle size (100–350 nm) of the Ce-NiO was smaller than that of pure NiO (400–900 nm), suggesting addition of Ce in the catalyst synthesis could lessen the aggregation or facilitate the dispersion of NiO particles. The highest catalyst activity was observed over the Ce-NiO catalyst with Ce/Ni atomic ratio of 0.2 and calcined at 400 °C. 94.14% of glycerol conversion and 90.95% selectivity to GC were obtained over this catalyst under the optimum conditions (5 wt.% catalyst of glycerol, 85 °C, 8 h, glycerol/DEC ratio of 1:3). This catalyst can be reused up to three cycles with a slight decrease in its catalytic activity. It was found the well dispersed NiO particles and the strong basic sites derived from the substitution of Ce 4+ by Ni 2+ in the CeO 2 lattices synergistically promoted the glycerol conversion.
研究领域:
催化化学
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材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2012
·Vol. 34
·期 2
·156-163
·
IF 1.231
Wensong Han
The second-generation poly(ester amine) dendrimer was prepared by Michael addition reaction and esterification reaction at first. Then, a series of novel waterborne polyurethane (WPU)-based composites were prepared by the addition of poly(ester amine) dendrimer into the WPU. The structures and the morphology of the WPU composites were measured with Fourier transform infrared spectrometer, scanning electron microscopy, and X-ray diffraction. SEM images revealed that the nanosilica was well dispersed in the WPU matrix. The mechanical properties of the WPU composites were improved with the addition of poly (ester amine) dendrimer. The dynamic mechanical thermal analysis results showed that the WPU composites had higher glass transition temperature than that of pure WPU, especially after incorporation of poly(ester amine) dendrimer. This conclusion is in good agreement with the differential scanning calorimetry results. The thermal properties of the pure WPU and its composites were investigated by thermogravimetric analysis. The results showed that the initial decompose temperature began from about 250°C, and had a little increase when introducing poly(ester amine) dendrimer into the WPU matrix. POLYM. COMPOS., 2012. © 2013 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）