CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Songlei Mo,Jia Kou,Jianrong Zeng,Kepeng Song,Yayun Zhang,Shangming He,Yongfeng Hu,Yong Guo,Xiaohui Liu,Xi Chen,Yanqin Wang
Upcycling polyethylene terephthalate (PET) wastes into high value-added oxygenated chemicals is desirable, yet it remains challenging. Herein, we develop a novel strategy to convert PET into 1,4-cyclohexanedimethanol (CHDM) via two steps, the conversion of PET to dimethyl 1,4-cyclohexanedicarboxylate (DMCD) over Ni-based catalysts, followed by the hydrogenolysis of DMCD to CHDM over a CuMgAl catalyst. The key step is the production of DMCD from PET in one-pot reaction and an unprecedent yield of 86.5% DMCD yield is achieved over Pd-modified Ni/CeO 2 catalyst, which to the best of our knowledge is the highest yield reported to date. Comprehensive characterizations demonstrate that the addition of Pd enhances hydrogen dissociation, but weakens the adsorption activation ability for C–O bond in esters, thus DMCD selectivity is improved. Over CuMgAl catalyst, DMCD is directly converted into CHDM with 83.8% yield. Furthermore, the techno-economic analysis proves the economic feasibility of converting PET into CHDM via our proposed strategy. The study provides a promising and effective approach to upcycle PET wastes into high value-added products.
研究领域:
化学工程
·
催化
·
废物管理
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Yuhang Wu,Guocong Ma,Anying Zhang,Weiwen Gu,Jianfei Wei,Rui Wang
Environmentally friendly polyethylene terephthalate-based carbon dots (PET-CDs) with ultrahigh fluorescence quantum yield were prepared with waste PET textiles as raw materials. First, oligomers were prepared from the reaction of waste PET textile and ethylene glycol by the microwave method. Then, the mixture without isolation and purification as well as pyromellitic acid and urea were adopted as precursors for the preparation of PET-CDs by the hydrothermal method. It was found that the as-prepared PET-CDs had a spherical structure with an average particle size of 2.8 nm. The carbon core of PET-CDs was a graphene-like structure doped with nitrogen atoms in the form of pyrrole nitrogen and the surface contained −NH2, which is convenient for modification and functionalization with various materials in the form of chemical bonds. The as-prepared PET-CDs exhibit excitation-independent emission properties in the range from 340 to 440 nm, and the best excitation and emission wavelengths of PET-CDs are 406 and 485 nm, respectively, while the fluorescence quantum yield is 97.3%. In terms of the application, the as-prepared PET-CDs could be adopted as a fluorescence probe for the detection of Fe3+, and the limit of detection is as low as 0.2 μmol/L. The mechanism of PET-CDs by Fe3+ was found to be the static quenching mechanism. In addition, PET-CDs can be used in LEDs and fluorescent anticounterfeiting.
研究领域:
材料科学
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环境科学
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纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Hongyi Shu,Chuang Wang,Liu Yang,Dongcang Sun,Changtong Song,Xianhong Zhang,Dong Chen,Yuhong Ma,Wantai Yang
Nowadays, effluent treatment is a severe challenge mainly because of its complex composition, which includes oil, heavy metal ions, and dyes. Developing new intelligent membranes is one of the strategies to tackle these significant challenges in wastewater treatment . In this study, we fabricated asymmetric polyethylene glycol terephthalate (PET) membranes by grafting cross-linked poly (itaconic anhydride) (CL-PITA) nanoparticles onto the irradiated face. These nanoparticles were then functionalized with polyethyleneimine (PEI) and protonated with HCl to introduce numerous active electropositive amine groups. The fundamental purpose was to increase surface roughness, introduce numerous hydrophilic groups, and modify it to create a multi-functional PET membrane to separate complex environments. The promising results demonstrated that the protonated PET- g -ITA/DVB (10) -cat membrane exhibited excellent separation efficiencies (SE) for water/light oil, water/heavy oil and oil-in-water (O/W) emulsion. Compared to PET- g -ITA/DVB (0) -cat, it showed superior performance in SE for O/W emulsion and flux decay for water/light oil after 10 cycles. More interestingly, owing to numerous positively charged active amino groups and negativley charged carboxylate groups, the intelligent membrane exhibited a high removal rate of ca. 90 % for anionic dye (congo red) and heavy metals (Cu 2+ and Co 2+ ), showing great potential in complex water treatment environments.
研究领域:
环境科学
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材料科学
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水处理
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Sustainability
·
2025
·
IF 4.9
ZIXIAN JIA,JIE ZHANG,LIN GAO,LIJIAO QIN,HAOCHENG SUN,JIAXING CHEN,Jian-Zhong Yin
The chemical recycling of polyethylene terephthalate (PET) via glycolysis is a promising route for recovering the monomer bis(2-hydroxyethyl) terephthalate (BHET), which can be used for virgin-grade PET production. However, the influence of water—an inevitable impurity and potential byproduct—on this process is complex and not fully elucidated. This study systematically investigates the effect of water content (0–22.2 vol%) on PET glycolysis using selected heterogeneous catalysts (ZnO, Mn₂O₃) and homogeneous catalysts (zinc acetate (ZnAc₂), 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)). Product distribution and reaction kinetics were quantified by HPLC and in-situ IR spectroscopy, respectively.The heterogeneous catalysts (ZnO, Mn₂O₃) and homogeneous ZnAc₂ maintained high PET conversion (>95%) even at elevated water concentrations. Nevertheless, the BHET yield and selectivity for these systems decreased significantly due to a competing hydrolytic side reaction, promoted by water, which yields terephthalic acid (TPA). Notably, ZnAc₂ exhibited a more rapid decline in BHET selectivity compared to ZnO. Conversely, the organic base catalysts TBD and DBU experienced complete deactivation in the presence of water, resulting in a drastic reduction in both PET conversion and BHET yield, with DBU showing greater susceptibility. In-situ IR experiments corroborated that the deactivation mechanism for TBD involves protonation by water. These results emphasize that water's influence is a function of the catalyst's chemical nature, modulating product selectivity for metal-based systems while causing the deactivation of organic bases. Understanding these divergent effects is critical for the optimization of industrial PET glycolysis and the rational design of water-tolerant catalytic systems.
研究领域:
高分子化学
·
催化化学
·
化学回收
·
反应工程
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环境化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 3
·2000661
·
IF 4.367
Wenguang Yu,Xuefeng Gao,Yuzhou Wang,Xuechen Wang,Xingxiang Zhang
The maleic anhydride functionalized graphene oxide (GO-MA) is fabricated by an efficient and solvent-free Diels–Alder reaction. Polyethylene terephthalate (PET)/thermotropic liquid crystal polyester (TLCP), PET/TLCP/GO-MA, PET/TLCP/aminated multi-walled carbon nanotubes (MWCNTs-NH 2 ), and PET/TLCP/GO-MA/MWCNTs-NH 2 composite fibers are systematically melt-spun. The structure and compatibilizing effects of GO-MA and MWCNTs-NH 2 on the mechanical, thermal, and crystallization properties of the composite fibers are indicated. The non-isothermal crystallization kinetics and X-ray diffraction (XRD) data show that TLCP and nanofillers can change the crystalline morphology of PET. The mechanical properties of the fibers rise with increasing TLCP content. The tensile strength 929 MPa and modulus 17.5 GPa of the fibers with 7 wt% TLCP and 0.25 wt% nanofillers (0.1 wt% GO-MA and 0.15 wt% MWCNTs-NH 2 ) are significantly higher than those with 7 wt% TLCP (tensile strength 622 MPa and modulus 16.1 GPa) and even higher than those with 15% TLCP (tensile strength 836 MPa, and modulus 18.0 GPa). When the GO-MA and MWCNTs-NH 2 co-exist, the anti-dripping phenomenon is improved. Therefore, the TLCP, GO, and MWCNTs synergistically strengthens the mechanical properties. This is promising for the industrial fabrication of high-strength fibers.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 17
·6901-6913
·
IF 9.8
Ling-Xia Yun,Yan Wei,Qian Sun,Yu-Ting Li,Bin Zhang,Hang-Tian Zhang,Zhi-Gang Shen,Jie-Xin Wang
Polyethylene terephthalate (PET), as the most widely utilized polyester, causes global environmental problems due to its massive and durable accumulation in natural environments. The glycolysis of PET is an attractive alternative to mechanical recycling, but there remains a strong demand for efficient, convenient, and inexpensive catalysts. Herein, we present a spray-drying-assisted way to construct magnetic hollow micro-sized nanoaggregates (HMNAs) by assembling composite metal oxide nanoparticles to depolymerize PET synergistically. The as-prepared ZnO–Fe3O4 HMNAs completely depolymerized PET with a high monomer yield of 92.3% in a short period of 30 min at 190 °C, far above individual ZnO and Fe3O4 nanoparticles (NPs). The composite HMNAs can be magnetically separated in a few minutes and maintain a high activity for 5 cycles. DFT study reveals that the HMNAs effectively facilitated glycolysis by the high content of Lewis acid sites as well as the stronger adsorption between PET and the catalyst owing to the structural synergy effect of ZnO–Fe3O4 HMNAs. Furthermore, this spray drying strategy as a versatile and scalable methodology is extended to fabricate other HMNAs, exhibiting a similarly enhanced efficiency of glycolysis. The HMNAs are expected to open up avenues for the design of catalysts for upcycling of discarded plastics.
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 2
·1-12
·
IF 3.8
Wang Tiantian,Liu Haicheng
Utilizing the allelopathic effect of plants to inhibit algae growth has gained significant attention from researchers in recent years. However, there are large amounts of microplastics in the aquatic environment, which may influence the inhibitory effects of allelochemicals on algae. Consequently, this research aimed to examine the individual and combined toxicity of gallic acid (GA) and polyethylene glycol terephthalate (PET) microplastics on Microcystis aeruginosa. At a concentration of 50 mg/L, PET significantly enhanced algal cell growth and chlorophyll a synthesis, while inducing oxidative stress without damaging the cell membrane. On the other hand, low concentrations of GA promote algal cell growth. However, high concentrations of GA not only inhibit growth and photosynthesis but also result in cellular abnormalities and severe oxidative damage, as well as membrane disruption. Moreover, it was observed that the exposure of PET diminished the toxicity of GA to M. aeruginosa . The combined exposure to GA and PET resulted in a slight increase in chlorophyll a content, as well as phycocyanin (PC), alloxyphycocyanin (APC), and phycoerythrin (PE) content, along with maximum photochemical efficiency (Fv/Fm), compared to GA exposure alone. In the combined system of GA and PET, the contents of superoxide dismutase (SOD) and malondialdehyde (MDA) were lower than those in the single GA system. Additionally, both systems showed a degree of improvement compared to the control group. Scanning electron microscopy (SEM) observed that the presence of PET resulted in reduced damage to algal cells compared to exposure to GA alone. This research establishes a foundation for understanding the synergistic impacts of allelochemicals and microplastics on M. aeruginosa , thereby providing a reference for managing cyanobacteria in water blooms.
研究领域:
环境科学
·
藻类学
·
毒理学
·
水生生态学
·
植物生理学
✓ 已验证
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2025
·
IF 4.5
Xin Wang,Xiaotong Li,Wei Zheng,Yongzhong Zhang,Xuebo Cheng,Yajing Liu,Lu Zhang,Hualong Chen,Lin Ai,Zehui Wu
To verify its application potential in the field of cardiac and cerebral disease diagnosis, the first human experiment of [18F]BIBD-239 was reported. Synthesized via a GMP-compliant automated process on a CFN-MPS200 synthesizer (per Chinese Pharmacopoeia 2020), it achieved radiochemical purity >95%, nondecay-corrected yield >15%, and molar activity >120 GBq/μmol (total synthesis time 80 ± 5 min) under optimized conditions (95 °C, 10 min). Preclinical studies in rats confirmed TSPO-specific binding. First-in-human studies (6 healthy volunteers, 1 high-grade glioma (HGG), 1 low-grade glioma (LGG)) showed it rapidly crossed the blood–brain barrier with low normal brain retention and high sustained myocardial uptake without in vivo defluorination. HGG had higher tumor-to-background ratios (3.09) than LGG (2.33), with uptake beyond MRI-enhanced regions, correlating with histopathology. The whole-body effective dose (0.0145 ± 0.0018 mSv/MBq) was lower than [18F]FDG. [18F]BIBD-239 has robust synthesis, favorable pharmacokinetics, and TSPO-specific binding, enabling dual utility in noninvasive glioma grading and glucose-independent myocardial imaging, supporting translation in neuro-oncology and cardiovascular assessment.
研究领域:
核医学
·
神经肿瘤学
·
心血管影像学
·
分子影像
·
转化医学
·
放射药学
·
肿瘤诊断
✓ 已验证
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Hezhen Pang,Jian Wang,Penglei Guo,Jie Zhang,Weiwei Zhao,Na Wang,Xiaoqing Liu
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (CBDO) modified co-polyesters are expected to replace bisphenol A polycarbonate applications in many fields, and the cis – trans isomerisation of CBDO directly affects the co-polyester properties. However, the separation of cis – trans CBDO isomers and the influence of cis–trans isomer ratio on the performance of co-polyester are poorly investigated at present. In this paper, an efficient method of separating cis – trans CBDO isomers was proposed, and CBDO modified PET co-polyesters (PEBT) with a total CBDO content of about 40 % and a cis -CBDO content of 20–100 % were synthesized by modulating the cis - content. The glass transition temperature (T g ) of the co-polyester with 100 % cis -CBDO was as high as 117.8 °C, and the increment in T g of the co-polyester with per mol of cis -CBDO introduced was calculated to be 0.92 °C, which was 2.7 times of the increment of trans -CBDO (0.34 °C). With the increase of cis -CBDO content from 20 % to 100 %, the tensile strength was correspondingly increased from 35.4 MPa to 40.2 MPa, and the elongation at break decreased from 74 % to 18 %, respectively. This paper provides a theoretical basis for the preparation of high-performance CBDO-modified co-polyesters.
研究领域:
高分子化学
·
材料科学
·
聚合物物理
·
功能材料
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xiaomiao Feng,Yue Feng,Qun Xu,Haiyan Zhu
The CoMnS-PDA (polydopamine) composite electrodes with high optical transparency and flexibility were fabricated on ITO/PET substrates via an electrochemical deposition method. The unique structural attributes, tunable electronic properties, and rich redox states inherent to bimetallic sulfides, combined with the catechol and nitrogen functional groups present in PDA, collectively enhance the surface modification effectiveness and pseudocapacitive performance of the electrodes. The CoMnS-PDA electrodes exhibit excellent pseudocapacitive performance, with a maximum areal capacitance of 189.3 mF cm−2 at a current density of 0.4 mA cm−2, while maintaining optical transmittance of around 80%. The assembled symmetric device exhibits 50% transparency and delivers an area capacitance of 28.7 mF cm−2 at a current density of 0.2 mA cm−2. Moreover, the device demonstrates outstanding flexibility, with negligible electrochemical performance degradation even under nearly 180° bending. When three devices are connected in series, they successfully light up a red LED, indicating the promising potential of these materials for flexible and transparent energy storage applications.
研究领域:
电化学
·
材料科学
·
纳米技术
·
能量存储
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Ling Qiu,Xi Li,Gaochao Lv,Yann Seimbille,Ke Li,Ying Peng,Qingzhu Liu,Minhao Xie,Jianguo Lin
Overexpression of legumain is closely associated with tumor proliferation, invasion, and metastasis. Because of its intrinsic properties, such as high sensitivity and resolution, positron emission tomography (PET) has become an effective imaging technique for early diagnosis, treatment response prediction, and monitoring. Herein, two legumain-targeting radiofluorinated smart probes (18F-2 and 18F-3) as well as a control probe (18F-1) were specifically designed for PET imaging of legumain activity in tumors. 18F-1, 18F-2, and 18F-3 were obtained with high radiochemical yield (RCY > 60%) and radiochemical purity (RCP > 99%) using a convenient “one-step” 18F-labeling method. The probes 18F-2 and 18F-3 exhibited high response to legumain activity and reductive environment and revealed comparable uptake in HCT116 cells (4.22% ± 0.14% and 4.64% ± 0.32% for 18F-2 and 18F-3, respectively; 8.46% ± 0.33% and 9.05% ± 0.24% for co-treatment of 18F-2 + 2 and 18F-3 + 3 at 1 h), while the control probe 18F-1 showed no response. PET imaging of tumor-bearing mice showed that the co-injection strategy (18F-2 + 2 and 18F-3 + 3) resulted in higher tumor uptake (3.57% ± 0.37% and 3.72% ± 0.19% ID/g at 10 min, respectively) than the single injection strategy (2.59% ± 0.19% and 2.60% ± 0.46% ID/g for 18F-2 and 18F-3, respectively). In addition, introduction of the trimeric histidine-glutamate (HEHEHE) tag to 18F-3 reduced the liver uptake by almost two-fold without any noticeable effect on the tumor uptake. All the results indicate that 18F-3 holds great potential applications in clinics for sensitive and specific PET imaging of legumain activity in tumors.
研究领域:
医学成像
·
癌症研究
·
分子生物学
·
放射学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Guanzhang Liu,Hang Yuan,Yaxin Chen,Lei Mao,Chun Yang,Ruifang Zhang,Guangya Zhang
The proliferation of nano-plastic particles (NPs) poses severe environmental hazards, urgently requiring effective biodegradation methods. Herein, a novel method was developed for degrading nano-PET (polyethylene terephthalate) using immobilized cutinases. Nano-PET particles were prepared using a straightforward method, and biocompatible elastin-like polypeptide-magnetic nanoparticles (ELPs-MNPs) were obtained as magnetic cores via biomimetic mineralization. Using one-pot synthesis with the cost-effective precursor tetraethoxysilane (TEOS), silica-coated magnetically immobilized ELPs-tagged cutinase (ET-C@SiO 2 @MNPs) were produced. ET-C@SiO 2 @MNPs showed rapid magnetic separation within 30 s, simplifying recovery and reuse. ET-C@SiO 2 @MNPs retained 86 % of their initial activity after 11 cycles and exhibited superior hydrolytic capabilities for nano-PET, producing 0.515 mM TPA after 2 h of hydrolysis, which was 96.6 % that of free enzymes. Leveraging ELPs biomimetic mineralization, this approach offers a sustainable and eco-friendly solution for PET-nanoplastic degradation, highlighting the potential of ET-C@SiO 2 @MNPs in effective nanoplastic waste management and contributing to environmental protection and sustainable development.
研究领域:
环境科学
·
生物技术
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）