Polymers
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2023
·Vol. 15
·期 2
·413
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IF 5
Jialin Xu,Kuo Zhou,Linlin Qin,Zaiming Tan,Shijing Huang,Peigao Duan,Shimin Kang
The chemical recycling of end-of-life polylactic acid (PLA) plays roles in mitigating environmental pressure and developing circular economy. In this regard, one-pot tandem alcoholysis and hydrogenation of PLA was carried out to produce 1,2-propanediol, which is a bulk chemical in polymer chemistry. In more detail, the commercially available Raney Co was employed as the catalyst, and transformation was conducted in ethanol, which acted as nucleophilic reagent and solvent. Single-factor analysis and Box–Behnken design were used to optimize the reaction conditions. Under the optimized condition, three kinds of PLA materials were subjected to degradation. Additionally, 74.8 ± 5.5%, 76.5 ± 6.2%, and 71.4 ± 5.7% of 1,2-propanediol was yielded from PLA powder, particle, and straws, respectively, which provided a recycle protocol to convert polylactic acid waste into value-added chemicals.Keywords:polylactic acid;alcoholysis;hydrogenation;1,2-propanediol;PLA straws
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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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Yao Xie,Ze Ji,Somia Yassin Hussain Abdalkarim,Haicheng Huang,Khaydar E. Yunusov,Hou-Yong Yu
Although bioplastics and paper straws have been introduced as alternatives to single-use plastic straws, their potential environmental, economic, and social impacts have not been analyzed. This study addresses this gap by designing a polylactic acid layer interface adhesion on cellulose paper-based (PLA-P) composite straws by a dip molding process. This process is simple, efficient, and scalable for massive production. Optimizing key manufacturing parameters, including ice bath ultrasonic, overlapping paper strips (2 strips), winding angle (60°), soaking time (5 min), and drying temperature (50 °C), were systematically evaluated to improve straw quality and manufacturing efficiency. PLA chains were found to deposit onto the cellulose network through intermolecular interactions to form a consistent "sandwich" structure, which can improve adhesion, water resistance, and mechanical properties. Interestingly, PLA-P straws effectively decomposed in soil and compost environments, with a 35–40 % degradation rate within 4 months. Besides, PLA-P straw residues affected seed germination and plant growth, but no significant toxic effects were detected. Further, microplastics were observed in soil and plant tissues (roots, stems, and leaves), and their possible diffusion mechanisms were explored. The results of a comprehensive life cycle assessment (LCA) and cost analysis showed that the process improvements reduced the ecological footprint of PLA-P straws and showed good prospects for commercial application. The study's findings contribute to the understanding of bioplastics and paper straws in effectively reducing environmental impact and fostering sustainable development.
研究领域:
材料科学
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环境科学
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生物学
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产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Yingying Xu,Xiaojin Huang,Yulan Wang,Weiyu Qu,Weiliang Guo,Bin Su,Zhihui Dai
One-dimensional molecular crystal waveguide (MCW) can transmit self-generated electrochemiluminescence (ECL), but heavy optical loss occurs because of the small difference in the refractive index between the crystal and its surroundings. Herein, we report a micropipette electrode-supported MCW (MPE/MCW) for precisely controlling the far-field transmission of ECL in air with a low optical loss. ECL is generated from one terminal of the MCW positioned inside the MPE, which is transmitted along the MCW to the other terminal in air. In comparison with conventional waveguides on solid substrates or in solutions, the MPE/MCW is propitious to the total internal reflection of light at the MCW/air interface, thus confining the ECL efficiently in MCW and improving the waveguide performance with an extremely low-loss coefficient of 4.49 × 10–3 dB μm–1. Moreover, by regulation of the gas atmosphere, active and passive waveguides can be resolved simultaneously inside MPE and in air. This MPE/MCW offers a unique advantage of spatially controlling and separating ECL signal readout from its generation, thus holding great promise in biosensing without or with less electrical/chemical disturbance.
研究领域:
分析化学
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生物传感
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Guofeng Wang,Shiwei Xu,Yueyue Feng,Liying Huang,Yajun Wang,Nannan Liu
Early cancer detection is crucial for improving patient survival rates. However, current single-biomarker detection methods often face challenges, such as insufficient sensitivity, poor accuracy, and false positives. To address these issues, we report a dual-functionalized glass micropipet sensor (DFMS) capable of simultaneously detecting two cancer biomarkers, nucleic acids and proteins. The inner surface of the sensor is functionalized with amino-modified silicon nanowires (SiNWs) to capture disease-related miRNAs, enabling ionic-current-based detection, while the outer surface is decorated with gold nanoparticles to anchor specific protein aptamers for Raman-based detection. This dual-functionalization significantly enhances the sensitivity and selectivity by combining ionic current amplification with plasmonic Raman signal enhancement. The sensor achieves detection limits of 1 aM for miRNAs and 0.001 ng/mL for proteins, with minimal mutual interference between the two detection modes, ensuring accurate and independent detection. Validation with prostate cancer biomarkers miRNA-1246 and PSA, as well as gastric cancer biomarkers miRNA-106a and CD44, demonstrates its outstanding sensitivity, selectivity, stability, and broad applicability, providing a novel approach for early cancer detection with significant clinical implications.
研究领域:
生物医学工程
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分子诊断学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Zede Yi,Xuepei Zhou,Juanli Shen,Shiyu Fu
The wide use of plastic straws has posed a persistent environmental challenge, which promotes the development of sustainable alternatives. In this work, inspired by the hierarchical structures of natural materials, we reported a facile approach to prepare straws with high toughness and good water resistance from microscale and nanoscale cellulose fibers. Pulp fibers from rice stalk were treated to prepare cellulose microfibers (CMF) and cellulose nanofibers (CNF), which were hybridized to form a film and roll up for straws. The straws prepared from both micro- and nano- fibers in ratio of 2:3 (CMF:CNF) show the best overall performance in terms of tensile strength (104.5 MPa), toughness (12.6 MJ/m 3 ) and elongation at break (17.0 %). Besides, the straws further cross-linked with Fe 3+ to enhance the network bindings between hierarchical cellulose fibers and effectively improve the water resistance. The ionic cross-linking treatment with 50 mM Fe 3+ for 2 h resulted in the straws with a water contact angle of ∼126°. The obtained straws can completely disintegrate in natural soil within 45 days. These cellulose-based straws are fully in line with the concept of environmental and ecological sustainability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
APPLIED THERMAL ENGINEERING
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2021
·
IF 5.295
Kai-Qi Zhong,Yang Xiao,Xing Lu,Jun Deng,Lan Yin,Yuan Tian,Chi-Min Shu
The current prevention and control countermeasures for underground coal fire principally rely on various cooling and inhibiting methods. However, because tremendous thermal energy is locked in underground coalfield fires, thermal energy extraction and utilisation is a sustainable and environmentally friendly approach. In this study, a waste heat recovery system based on a two-phase closed thermosyphon-assisted thermoelectric generator technique was established for exploiting the thermal reservoir in underground coalfield fires. To enhance thermal extraction, nanofluid working fluid was used. The optimal concentration of the copper oxide (CuO) nanoparticle in the two-phase closed thermosyphons at three heat source temperatures (100, 200, and 300 °C) was found to be 5.0, 5.0, and 10.0 mass%, respectively. Proper addition of CuO enhanced the thermal transfer in the two-phase closed thermosyphon by 27.90%. Furthermore, the increase in the heat source temperature was positively related to the thermal extraction effect of the two-phase closed thermosyphon. With an optimised two-phase closed thermosyphon, the thermoelectric generator system, combined with forced air cooling, provided an output power of 0.1432–3.1360 W with a thermoelectric conversion efficiency of 0.54%–1.83% for heat sources ranging from 100 to 300 °C.
研究领域:
能源工程
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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
FOOD CHEMISTRY
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2024
·
IF 8.5
Pengfei Liu,Yue Li,Deyin Wang,Ruoxuan Xu,Yandu Jiang,Xinyu Qiao,Wei Gao,Bin Yu,Bo Cui
This study aimed to assess the effects of different ratios of water and glycerol on the physicochemical properties of starch-based straws (SBS) and explore their plasticising mechanism. X-ray diffraction analysis revealed that the V -type complex formation was influenced by adjusting the ratio of glycerol and water. The extruded samples exhibited lower water content (4.72–7.65 %) than those of native starch (12.39 %). The change in hydrogen bond interactions among water, starch and glycerol was the main reason for the difference in the performance. The glass transition temperature (T g ’) ranged from −6.2 to −9.1 °C for the SBS with glycerol, while the T g ’ values was −2.7 °C for the native starch. The sample with 15 % glycerol and 5 % water showed the highest maximum decomposition temperature (323.91 °C) and contact angle (72.07°) among all of the analysed SBS. The E b values of glycerol-containing samples (136.13–308.13 N/cm) were lower than that of the water-containing samples (291.26–356.53 N/cm).
研究领域:
食品科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yuanpu Liu,Ting Wei,Wenxin Xie,Yajie Yuan,Yanfei Wang,Yang Qin,Meng Ma,Qingjie Sun,Man Li,Fengwei Xie
The extensive and persistent utilization of disposable plastic straws by humans has engendered significant environmental issues. However, it is challenging to find suitable substitutes for plastic straws with comparable properties. Here, we propose a versatile design of all-natural, degradable straws as a plastic substitute, using a directional diffusion assembly (DDA) method, which controls the directional diffusion of a cross-linker for subsequent cross-linking, without the constraints of rolling-up, extrusion, and injection molding techniques. Employing the DDA method on alginate, the seaweed-based straws prepared exhibited excellent hygrostability, especially in hot water, better than commercial paper and PLA straws. Scanning electron microscopy (SEM) images and Fourier transform infrared spectroscopy (FT-IR) spectrum demonstrated the high cross-linking between alginate and Ca2+ after resoaking. Moreover, they displayed natural degradability (within 180 days, indicated by the significant changes in residual weight, molecular weight, and microstructure) and high mechanical properties, including bending resistance (∼14 MPa) and tensile strength (∼80 MPa). Considering these advantages, the seaweed-based straws developed in this work hold significant promise as substitutes for petroleum-based plastic products like straws.
研究领域:
材料科学
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环境科学
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生物学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Zede Yi,Shiyu Fu,Ying Wang,Jingbo Ai,Chuanshuang Hu,Shao-Yuan Leu,Altaf Halim
The mass consumption of plastic straws already seriously causes environmental pollution and harms human health, which urgently requires the manufacture of eco-friendly straws as alternatives. Herein, a facile approach was reported for producing tough, water-resistant, and biodegradable lignocellulose straws. The renewable agricultural residue (i.e., rice stalk) was pretreated with a deep eutectic solvent to redistribute lignin from the stalk fibers and obtain two cellulosic materials: lignin-regenerated cellulosic fiber (LRCF) and lignin-dissolved cellulosic fiber (LDCF). The LRCF and LDCF were refined and fibrillated and subsequently utilized to form a wet film. The wet film was then rolled into a tube without any adhesives and dried as straw products. The obtained straws exhibited excellent mechanical properties (maximum tensile strength and toughness of 90.2 MPa and 15.3 MJ/m3, respectively), water resistance (maximum water contact angle of 95.34°), and natural biodegradability (the fastest complete degradation in 25 days). These straws are fully derived from lignocellulose biomass and provide environmentally friendly alternatives to plastic straws.
研究领域:
环境科学
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材料科学
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生物质工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhenghong Wu,Shaomin Kang,Yena Liu,Peipei Wang,Tian Liu,Rani Bushra,Mohammad Rizwan Khan,Jiaqi Guo,Wenyuan Zhu,Huining Xiao,Junlong Song
This study focuses on enhancing the strength and water stability of paper straws through a novel approach involving a binary emulsion of lignin-based polyurethane and chitosan. Kraft lignin serves as the raw material for synthesizing a blocked waterborne polyurethane , subsequently combined with carboxylated chitosan to form a stable binary emulsion. The resulting emulsion, exhibiting remarkable stability over at least 6 months, is applied to the base paper. Following emulsion application, the paper undergoes torrefaction at 155 °C. This process deblocks isocyanate groups, enabling their reaction with hydroxyl groups on chitosan and fibers, ultimately forming ester bonds. This reaction significantly improves the mechanical strength and hydrophobicity of paper straws. The composite paper straws demonstrate exceptional mechanical properties, including a tensile strength of 47.21 MPa, Young's modulus of 4.33 GPa, and flexural strength of 32.38 MPa. Notably, its water stability is greatly enhanced, with a wet tensile strength of 40.66 MPa, surpassing commercial paper straws by 8 folds. Furthermore, the composite straw achieves complete biodegradability within 120 days, outperforming conventional paper straws in terms of environmental impact. This innovative solution presents a promising and sustainable alternative to plastic straws, addressing the urgent need for eco-friendly products.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Zhu-Rui Zhang,Ying Chen,Zhi-Wei Wang,Chang-Ying Hu,Yuling Hu,Xiaowen Xu
Polylactic acid (PLA) straws hold eco-friendly potential; however, residual diisocyanates used to enhance the mechanical strength can generate carcinogenic primary aromatic amines (PAAs), posing health risks. Herein, we present a rapid, comprehensive strategy to detecting PAAs in 18 brands of food-grade PLA straws and assessing their migration into diverse food simulants. Surface-enhanced Raman spectroscopy was conducted to rapidly screen straws for PAAs. Subsequently, qualitative determination of migrating PAAs into various food simulants (4 % acetic acid, 10 % ethanol, 50 % ethanol) occurred at 70 °C for 2 h using liquid chromatography-mass spectrometry. Three PAAs including 4,4′-methylenedianiline, 2,4′-methylenedianiline, and 2,4-diaminotoluene were detected in all straws. Specifically, 2,4-diaminotoluene in 50 % ethanol exceeded specific migration limit of 2 μg/kg, raising safety concerns. Notably, PAAs migration to 10 % and 50 % ethanol surpassed that to 4 % acetic acid within a short 2-hour period. Moreover, PLA straws underwent varying degrees of shape changes before and after migration. Straws with poly(butylene succinate) resisted deformation compared to those without, indicating enhanced heat resistance, while poly(butyleneadipate-co-terephthalate) improved hydrolysis resistance. Importantly, swelling study unveiled swelling effect wasn’t the primary factor contributing to the increased PAAs migration in ethanol food simulant, as there was no significant disparity in swelling degrees across different food simulants. FT-IR and DSC analysis revealed higher PAAs content in 50 % ethanol were due to highly concentrated polar ethanol disrupting hydrogen bonds and van der Waal forces holding PLA molecules together. Overall, minimizing contact between PLA straws and alcoholic foods is crucial to avoid potential safety risks posed by PAAs.
研究领域:
食品安全
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Guofeng Wang,Shiwei Xu,Chao Deng,Yueyue Feng,Liying Huang,Qin Guo,Yajun Wang,Min Zhang,Qian Shi,Nannan Liu
Copper ions (Cu + and Cu 2+ ) are vital for physiological functions, and their imbalance is implicated in disease progression. However, simultaneous detection of both species is challenging due to their similar properties. Here, we report a dual-functionalized glass micropipette sensor enabling independent detection of Cu + and Cu 2+ . UiO-66-NH 2 was grown in situ on the inner wall to capture Cu 2+ via amino coordination, reducing ionic current. Glutathione-functionalized carbon nanotubes (GCNTs) coated on the outer surface bind Cu + , increasing SERS signal via enhanced surface defects. The sensor exhibits a wide detection range (10 -1 –10 5 μM), a detection limit of 0.1 μM, and allows simultaneous monitoring of Cu + /Cu 2+ in the physiological range (2–10 μM). It further distinguishes copper ion levels in MCF-10A and MCF-7 cells, revealing altered copper homeostasis in cancer. This platform offers a sensitive, selective tool for studying copper in biological systems.
研究领域:
生物化学
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分析化学
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医学
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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）