ACS Sustainable Chemistry & Engineering
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2023
·
IF 8.4
Weiwei Wang,Jin Jiang,Qinglong An,Rui Shi,Shuyang Shao,Zhi Wang
Due to its outstanding properties, benzoxazine resin is widely used in the manufacturing of machinery, aerospace, and electrical products. However, once polybenzoxazine and its composites reach the end of their useful lives, their three-dimensional network structure and persistent cross-linking after curing pose challenges for degrading. To address this issue, our study focuses on incorporating 2,3-dihydrofuran (DHF)-containing cleavable bonds into the cross-linked network of benzoxazine (PH-5n2m) containing the structure of norbornene by ring-opening metathesis polymerization (ROMP). Due to the unique chemical structure of norbornene and the flexibility of the DHF chain segment, poly(PH-5n2m/DHF-x) exhibits remarkable thermal stability and improved toughness compared to poly(PH-5n2m). Additionally, under weak acid conditions, the PH-5n2m/DHF-50/CF composite can degrade fully in less than 10 h, facilitating the nondestructive recycling of the carbon fiber. This work presents a novel approach to the development of thermosetting resins with high thermal stability, improved toughness properties, and degradability, offering promising prospects for sustainable materials in various industries.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuhui Zhang,Fei Liu,Li Zhong,Zhaoji Dong,Chuchu Chen,Zhaoyang Xu
Tetracycline antibiotics are currently detected in most water sources. The presence of such pollutants in the environment is becoming increasingly common, and addressing this contamination is a significant challenge due to its potential threat to human health and ecosystem stability. This study successfully prepared cellulose nanofiber/titanium dioxide/chitosan (CNF/TiO 2 /CS) aerogels by directional freeze-drying technique for photocatalytic degradation of tetracycline-contaminated wastewater. The CNF/TiO 2 /CS aerogel photocatalysts have a three-dimensional mesh structure with a large specific surface area, which provides many active sites for the highly efficient photocatalytic degradation of tetracyclines. The CNF/TiO 2 /CS aerogel showed 99.5% tetracycline removal efficiency within 180 min. Free radical scavenging experiments investigated the adsorption and photodegradation mechanism of tetracycline by CNF/TiO 2 /CS aerogel. The critical participation of •O 2 - and h + in the decomposition of tetracycline was verified, which provided experimental support for the photocatalytic reaction mechanism. In addition, the CNF/TiO 2 /CS aerogel has high stability and recyclability for photocatalytic degradation, which can be recycled 7 times, and the recycling process is environmentally friendly. An in-depth analysis of the intermediate degradation products using liquid chromatography-mass spectrometry (LC-MS) revealed two efficient photocatalytic degradation pathways. These findings strongly confirm the extensive potential of photocatalytically active aerogels for wastewater treatment.
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Horticulturae
·
2023
·Vol. 9
·期 9
·1019
·
IF 3.1
Yuan Zhang,Mina Nan,Huali Xue
Radix Astragali(RA) is the root ofAstragalus membranaceusvar. mongholicus (Bunge) P.K. Hsiao. In order to determine targeted and effective methods for treating mold infections in fresh RA, pathogenic fungi were isolated and identified using morphology and molecular biology techniques, and factors affecting the growth of the pathogenic fungi, such as temperature, pH, light, and carbon and nitrogen sources, were analyzed. Changes in the main active ingredients of RA, such as carbohydrates, flavonoids, and saponins, were detected before and after infection with pathogenic fungi. The results showed thatPenicillium polonicum,Trichothecium roseum, andFusarium equisetiwere the main pathogens causing postharvest disease in fresh RA. The optimum growth temperature for the three pathogens was 25 °C;P. polonicumwas able to grow at an alkaline pH of 8–9, whileT. roseumandF. equisetigrew better and had higher levels of sporulation under acidic conditions with pH values of 5–6. Different carbon and nitrogen sources had different effects on mycelium growth and sporulation. Darkness was favorable for the growth and sporulation of the three pathogens. Compared with healthy RA, the total carbohydrate, flavonoid, and saponin contents of the RA samples infected with the three fungi decreased. This study provides a theoretical basis for the scientific and precise control of RA postharvest disease during storage by targeting different pathogens and their growth conditions.Keywords:Radix Astragali;postharvest disease;identification;biological characteristics;active ingredients
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qi-Xin Wei,Ai-Yong Zhang,Zedong Yang,Song Hu,De-Jin Wang,Chi Zhang,Chang Liu,Rui Liu
Solid catalyst plays the governing role in the heterogeneous Fenton-like catalysis for water purification . In this work, the Co(II)-doped C 3 N 4 (Co/C 3 N 4 ) was prepared and further thermally exfoliated in different atmosphere for the three-dimensional layered configuration. The morphological and structural properties as well as surface chemistry of Co/C 3 N 4 before and after thermal exfoliation were elucidated in comparison. The oxygen-exfoliated Co/C 3 N 4 (O-Co/C 3 N 4 ) exhibited accessible metal exposure and synergistic pollutant adsorption stemmed from three-dimensional layered configuration with ordered porous configuration, oriented lamellar structure and increased surface area. Moreover, an excellent Fenton-like reactivity and stability was measured for PMS activation and pollutant degradation , and the comparative performance before and after oxygen exfoliation as well as with typical metal-based catalysts were investigated in details. The impacts of testing conditions and water matrices were elucidated to estimate environmental potential. Based on radical identifying and inhibiting tests and electrochemical measurements, the non-radical reaction pathway from mediated electron transfer (MET) played the key role with much reduced matrix effects and satisfactory catalytic selectivity . This work provides a new chance to save transition-metal consumption and refine Fenton-like reactivity in C 3 N 4 -based catalysts for superior environmental remediation.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2023
·
IF 3
Jiannan Chen,Xiuhua Xia,Peizhen Li,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
As a type of environmentally deleterious compound, 4-nitrophenol (4-NP) has become a global concern due to its extreme toxicity to aquatic organisms and humans. Herein, we used naturally available crayfish shells as precursors to prepare a new type of carbon dots (CDs) by the hydrothermal method. The as-synthesized CDs exhibited strong blue fluorescence emission which can be sensitively quenched by 4-NP through the static quenching effect because of the formation of a ground state complex between CDs and 4-NP. Accordingly, a facile and rapid fluorescence sensor was developed to detect 4-NP from 0 μM to 50 μM with a limit of detection (LOD) of 0.16 μM. Furthermore, the proposed sensor was successfully applied for the detection of 4-NP in fresh crayfish meat and aquatic water samples.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jun Zhang,Chunyuan Wang,Shiyu Lu,Shuyue Liu,Pingjuan Liang,Huan Yi,Mengjie Li,Meng Jin,Rong Wang,Guangming Jiang
Enhancing the enrichment behavior of low-concentration chlorinated organic pollutants remains a significant challenge in electrocatalytic hydrodechlorination (EHDC) technology. Metal-loaded hollow nanoarchitecture has emerged as a promising nanoreactor to improve reaction enrichment behavior because of its tailorable microenvironments and electronic properties. Herein, a structural engineering strategy is developed to synthesize yolk-shell structured TiN spheres supported Pd nanoreactors (Pd/YS-TiN) with confined mesoscopic spaces. Characterization by multiple techniques reveals that the yolk-shell structure of YS-TiN, with high specific surface area (139.0 m 2 /g) and appropriately mesoporosity (6.9 nm), exposes numerous Pd nanoparticles (∼4.0 nm) on outer/inner surface of the shell and yolk-core solid sphere, ensuring an efficient utilization of active sites for enhancing the 2,4-DCP detoxification. Consequently, the structurally optimized Pd/YS-TiN nanoreactor consistently displays maximum reaction kinetics, dechlorination degree, faradaic current density, H* utilization and product selectivity, surpassing hollow TiN-supported Pd and Pd/C catalysts. The super EHDC performance of 91.8 % 2,4-DCP conversion, a specific activity of 1.68 min −1 mol Pd −1 , and a mass activity of 6.06 min −1 g Pd −1 is obtained at −0.85 V and 180 min, outperforming most reported catalysts. Combining experimental and density functional theory results, the exceptional reaction enrichment behavior of Pd/YS-TiN originates from (1) alleviating the overstrong adsorption of product phenol through strong metal-support interactions and (2) enhancing mass transport efficiency facilitated by the local concentration gradient and mesoporous shell. This study elucidates how metal-support interactions and mass transport synergistically enhance reaction enrichment behavior, showcasing potential benefits in environmental remediation applications.
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JOURNAL OF CHROMATOGRAPHY A
·
2023
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IF 4.1
Zhentao Li,Zhengzheng Liao,Xiaoru Ding,Jinfang Hu,Zilin Chen
Herein, a spherical covalent organic framework COF TAPB-DMTP was facilely synthesized from 2,5-dimethoxyterephthalaldehyde (DMTP) and 1,3,5-tri-(4-aminophenyl)benzene (TAPB) as monomers. COF TAPB-DMTP with regular mesoporous and excellent mass transfer ability was first introduced into the capillary and immobilized on the inner wall of the capillary through a simple in situ growth method. Through various characterization results, COF TAPB-DMTP was successfully prepared and modified onto the capillary inner wall. The separation performance and potential of COF TAPB-DMTP modified capillary column was explored. The new developed COF modified column achieved a highly efficiency and selective separation between analytes with different properties, including halogeno benzenes, alkylbenzenes, phenols and sulfonamides. Satisfactory stability and reproducibility were observed on COF TAPB-DMTP modified columns. The intraday, interday and three batch columns relative standard deviations were all less than 1.85 % for the retention time. The separation performance of prepared column has no significant change after 90 continuous runs. Additionally, the COF TAPB-DMTP modified capillary column was successfully used for separation and detection of triazole antifungal drugs in human plasma, and the recoveries of three antifungal drugs (fluconazole, isavuconazole and posaconazole) in spiked samples were in the range of 98.6–100.8 %, 92.4–102.1 % and 99.9–107.5 %, respectively. This self-made column showed excellent application potential in chromatography separation science.
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PubMed
高影响因子
Polymers
·
2023
·Vol. 16
·期 1
·103
·
IF 5
Qiao Zhou,Yuanyuan Zhao,Yafei Shi,Rongrong Zheng,Liying Guo
Utilizing triethylenediamine (DA), 1,3-propanesultone (PS), whose ring opens during the formation of the dizwiterion-intermediate DA-2PS, and the metal chlorides XCly, where X = Sn(IV), Zn(II),Al(III), Fe(III) and Mn(II), are used for the synthesis of five kinds of acidic metal-based functionalized ionic liquid catalysts ([DA-2PS][XCly]2). Their chemical structures, thermal stability and dual acidic active site were analyzed. We investigated the performance of [DA-2PS][XCly]2in catalyzing the esterification reaction between 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG) to synthesize poly (ethylene 2,5-furandicarboxylate)(PEF). Among the catalysts tested, [DA-2PS][SnCl5]2exhibited the best catalytic performance under identical process parameters, and the optimal catalyst dosage was determined to be 0.05 mol% based on FDCA. The optimal conditions for the reaction were predicted using response surface methodology: a feed ratio of EG:FDCA = 1.96:1, an esterification temperature of 219.86 °C, a polycondensation temperature of 240.04 °C and a polycondensation time of 6.3 h, with a intrinsic viscosity of 0.67 dL·g−1. The resulting PEF was experimentally verified to exhibit an intrinsic viscosity of 0.68 dL·g−1and a number average molecular weight of 28,820 g·mol−1. Finally, the structure and thermal properties of PEF were characterized. The results confirmed that PEF possessed the correct structure, exhibited high thermal stability and demonstrated excellent thermal properties.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·7198-7207
·
IF 12.732
Xiaoyong Yu,Lijing Wang,Xin Wang,Hongzhi Liu,Ziyuan Wang,Yixuan Huang,Guoqiang Shan,Weichao Wang,Lingyan Zhu
Supported metal catalysts are widely used for heterogeneous catalytic processes (e.g., Fenton-like reaction), but the mechanisms of interfacial processes are still ambiguous. Herein, unique nanocarbon based catalysts with Co nanoparticles encapsulated in nitrogen (N)-doped graphene (Co@NG) were prepared by calcination of Co based metal–organic frameworks (MOFs), which showed excellent catalytic performance for peroxymonosulfate (PMS) activation. Comprehensive characterization revealed that there were strong interfacial interactions between Co and the NG layer due to the presence of special nitrogen species, especially graphitic-N. Density functional theory calculations suggested that the strong interfacial interactions provided optimal active sites with low adsorption energy (−1.99 eV) for PMS accumulation, which enabled the generation of highly oxidizing NG–PMS* intermediates as evidenced by in situ Raman microscopy. Electrochemical analyses revealed that the interfacial interactions facilitated surface-to-surface electronic communication across atomic interface-bonding (N–Co). Consequently, phenol was quickly degraded by the NG–PMS* via direct oxidation by an anodic-like nonradical process, and reasonable graphitic-N (G-N) content and pore size are important for this process. Phenol at 1 mM was completely removed within only 12 min by Co@NG-900 (which was prepared at 900 °C), with an apparent rate constant 20 times higher than that of pure NG-900. This work sheds new insights on the critical role of interfacial interactions in nonradical PMS activation.
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JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Long Liu,Yuanyuan Tang,Kunyu Wang,Tianzeng Huang,Tieqiao Chen
A facile and general method for constructing carbon–heteroatom (C–P, C–O, C–S, and C–N) bonds via C–N cleavage of benzyl ammonium salts under transition-metal-free conditions was reported. The combination of t-BuOK and 18-crown-6 enabled a wide range of substituted benzyl ammonium salts to couple readily with different kinds of heteroatom nucleophiles, i.e. hydrogen phosphoryl compounds, alcohols, thiols, and amines. Good functional group tolerance was demonstrated. The scale-up reaction and one-pot synthesis were also successfully performed.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 25
·50588
·
IF 3.125
Zongwei Guo,Zice Xu,Zhiqiang Dong,Mengjie Zhang,Zhiyuan Chi,Ming Li,Lei Shang,Yuhui Ao
Vanillin, a rigid compound can be separated from lignin, is a promising sustainable candidate for industrial and high performance polymers, while synthesis of hexa-epoxies is challenging. Meanwhile, carbon fiber reinforced bio-based polymers combining high performance are more difficult to be achieved because of the contradictions of liquidity and high rigidity in the polymer structure and performance. In this paper, a novel hexa-epoxy functionalized bio-based epoxy resin (HPVIGEP) with a multi-arm star structure, which simultaneously reduced the viscosity and improved thermo-mechanical properties. The rheological behavior analysis results of HPVIGEP indicated that the viscosity was 3406.9 mPa·s at 25°C, which dramatically decreased by 75.8% compared to DGEBA (14,096 mPa·s), leading to excellent processability and adaptability. At the same time, the study on mechanical properties revealed that the cured HPVIGEP manifested 30.6%, 33.7% and 49.0% in higher tensile strength, tensile modulus and storage modulus (30°C) than of cured commercial epoxy, respectively. The tensile strength and flexural strength of carbon fiber composites which were applied HPVIGEP were increased by 9.3% and 10.9%, respectively. In a word, this work provides the promise for the application of environmentally friendly bio-based composite materials.
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Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 2
·355-367
·
IF 6.707
Yang Weiyi,Chen Yan,Gao Shuang,Sang Licheng,Tao Ruoge,Sun Caixia,Shang Jian Ku,Li Qi
Photocatalysts with the photocatalytic “memory” effect could resolve the intrinsic activity loss of traditional photocatalysts when the light illumination is turned off. Due to the dual requirements of light absorption and energy storage/release functions, most previously reported photocatalysts with the photocatalytic “memory” effect were composite photocatalysts of two phase components, which may lose their performance due to gradually deteriorated interface conditions during their applications. In this work, a simple solvothermal process was developed to synthesize Bi 2 WO 6 microspheres constructed by aggregated nanoflakes. The pure phase Bi 2 WO 6 was found to possess the photocatalytic “memory” effect through the trapping and release of photogenerated electrons by the reversible chemical state change of W component in the (WO 4 ) 2− layers. When the illumination was switched off, Bi 2 WO 6 microspheres continuously produced H 2 O 2 in the dark as those trapped photogenerated electrons were gradually released to react with O 2 through the two-electron O 2 reduction process, resulting in the continuous disinfection of Escherichia coli bacteria in the dark through the photocatalytic “memory” effect. No deterioration of their cycling H 2 O 2 production performance in the dark was observed, which verified their stable photocatalytic “memory” effect.
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