Biomaterials Science
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2022
·Vol. 10
·期 15
·4284-4292
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IF 7.59
Ruixia Liu,Tingting Ding,Pingping Deng,Xiaofan Yan,Fuquan Xiong,Jienan Chen,Zhiping Wu
This work was carried out in order to broaden the application field of lignin and improve its additional value. The degraded deep eutectic solvent lignin-grafted poly(N-vinyl caprolactam) (DES-lignin-g-PNVCL) was synthesized by using modified DES-lignin and NVCL via activators regenerated by electron transfer-atom transfer radical polymerization (ARGET-ATRP). Aspirin was coated with DES-lignin-g-PNVCL through self-assembly by an ethanol/water anti-solvent method to obtain lignin thermosensitive polymer nanoparticle coated aspirin (aspirin@LTNP). X-ray electron spectroscopy (XPS), elemental analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), and ultraviolet visible spectroscopy (UV) were used to characterize the composition, structure and morphology of DES-lignin-g-PNVCL and aspirin@LTNP. The releasing behavior of aspirin@LTNP at different temperatures and pH values was investigated. The safety was evaluated by cytotoxicity tests. The results indicated that aspirin@LTNP was mainly accumulated by the hydrophobic effect and π–π interaction in the process of self-assembly, and its morphology was an ellipsoid stacked layer by layer. The aspirin@LTNP hydrophilic chains were increased and had externally hydrophilic and internally hydrophobic structures. The particle size decreased slightly during the self-assembly process. The red-shift occurred at the π–π interaction wavelength of the lignin aromatic ring, which indicated a physical coating process. The coating rate of aspirin@LTNP was 88.87%. Aspirin@LTNP showed an obvious temperature response; the 96 h cumulative release rate at the LCST was 73.75 ± 1.16%, while the 96 h cumulative release rate above the LCST was 28.10 ± 0.92%. The 96 h cumulative release rate was 63.21 ± 0.57% at pH = 1.5 and 49.56 ± 0.48% at pH = 7.4. The dosage of aspirin@LTNP used in the experiment was safe. This study provided a strategy for drug coating and controlled release.
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高影响因子
AQUACULTURE
·
2022
·
IF 5.135
Linhan Li,Tao Zhang,Gengrong Zhang,Guoqing Zhou,Fei Yang,Erlong Wang,Tianqiang Liu,Gaoxue Wang
Micropterus salmoides rhabdovirus (MSRV) seriously threats largemouth bass farming in China. Vaccine is a widely-used way to protect against virus infection. However, traditional intramuscular injection is inconvenient, time-consuming, and hard to applicate universally. We employed the naturally biodegradable bacterial nanocellulose (BNC) as effective virus antigen carriers for bath vaccination and improving the largemouth bass immune response. In this study, 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation of bacterial cellulose (BC) was applied to produce carboxylated BC, which was validated by Fourier transform infrared spectroscopy (FTIR) and elementary analysis. Followed by a controlled sulfuric acid hydrolysis reaction to form carboxylated bacterial nanocellulose (BNC-COOH) with an average size of about 350 nm. Amination reaction was conducted via conjugating the amine groups in MSRV glycoproteins (G) with the carboxyl groups in the BNC-COOH. The prepared bacterial nanocellulose loaded glycoprotein complex (BNCs-G) was used to vaccine largemouth bass via bath immunization. The protective effects were assessed by analyzing MSRV G proteins-specific serum antibody levels and the expression of four immune-related genes ( IgM , IL-12 , TCR , TNF- α, and CD4 ). Results showed that serum antibody levels and the expression of immune-related genes were significantly increased for BNCs-G bath-vaccinated groups (40 mg L −1 ), compared with PBS and the naked G protein groups. After bath immunization for four weeks, fish were challenged with a lethal dose of MSRV. The survival rates for control group (PBS), BNCs group (40 mg L −1 ), the naked G protein groups (40 mg L −1 ) and three BNCs-G groups (10 mg L −1 , 20 mg L −1 and 40 mg L −1 ) were 0%, 0%, 30.0%, 16.7%, 46.7% and 66.7%, respectively. These results indicated that BNCs could be a plausible candidate for the vaccine carrier system, and the BNC loaded glycoprotein showed good immunogenicity.
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Molecular Catalysis
·
2022
·
IF 5.089
Jie Xu,Jiusheng Shi,Jingyu Wang,Lihui Zhang,Yujie Wang
Depolymerizing lignin to prepare aromatic high-value chemicals is beneficial to solve the problem of energy shortage and waste of resources. However, cleavage of lignin C C bonds still faces greater challenges due to the recalcitrance of C C bonds in lignin. Photocatalysis is considered to be a promising way to break lignin C C bonds under mild conditions. Here, the micellar aqueous medium (SDS) composed of sodium lauryl sulfonate and water was prepared. 1, 2-Diphenylethanol (lignin model compound, Dpol) and dioxanesolv poplar lignin can be well dispersed in SDS-8 (mass fraction of 0.08% for sodium lauryl sulfate). Photocatalyst g-C 3 N 4 can efficiently break the lignin C C bonds in SDS-8 and very high photocatalytic efficiency can be obtained. A small amount of acetic acid can further improve photocatalytic efficiency. The main products produced by photocatalytic breaking lignin C C bonds are benzaldehyde and benzoic acid. The mechanism of photocatalytic cleavage of lignin C C bonds mainly follows a photogenerated electron-hole coupled redox mechanism. Thereinto, the hydrogen provided by SDS-8 has powerfully promoted photocatalytic efficiency. Our work provides a new direction for photocatalytic cleavage of lignin C C bonds into aromatic high-value chemicals.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Jie Wei,Yumeng Li,Qingyang Si,Qiao Xiao,Qingmin Chen,Tianhui Jiao,Quansheng Chen,Xiaomei Chen
A label-free, sensitive and reliable electrochemical sensor based on hemin/G-quadruplex (G4) DNAzyme was engineered to determine adenosine triphosphate (ATP) in fish. The nucleic acid sequence (DNA1) including the G4 sequence subunit and anti-ATP aptamer segment is anchored on Au electrodes. The nucleic acid sequence (DNA2) is composed of another G4 sequence fragment and anti-ATP aptamer subunit. The probes DNA1 and DNA2 self-assemble into the active hemin/G4 DNAzyme structure on Au electrodes upon exposure to the target ATP. The determination of the target ATP relied on an increase in the catalytic currents occurring on DNAzyme-anchored electrode via the electrochemical reduction of H 2 O 2 . The proposed strategy enables high-performance and specified determination of the target ATP with a detection limit of 0.04 μmol/L. Specifically, the proposed ATP strategy was further implemented to determine ATP in microorganisms in carp samples. Compared with the classical total viable count (TVC) assay, the proposed ATP assay was feasible to assess the freshness of carp, which expands the applications of hemin/G4 DNAzyme and holds promising potential for freshness assessment in food safety.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 18
·8644-8652
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IF 3.925
Minpeng Zhang,Huitong Xu,Lei Wu,Yu Tan,Dezhi Kong,Mamatjan Yimiti
As the most abundant renewable aromatic resource, the catalytic depolymerization of lignin to obtain high value-added aromatics is very attractive but full of challenges. Photocatalysis is a promising approach in this case. In this research, calcination and solvothermal procedures were used to make TiO2/g-C3N4 heterojunction composites, and XRD, SEM, and TEM characterization methods were used to investigate the structural and morphological properties of TiO2/g-C3N4. Photoluminescence and photoelectrochemical measurements were conducted to confirm the evidence of efficient charge carrier separation by nano-composites. TiO2/g-C3N4 doped with 10 mg of g-C3N4 had the best efficacy under simulated sunshine irradiation, with lignin degradation reaching 75%, which was twice as effective as pure TiO2. Lignin was successfully reduced into tiny molecules, thus according to GC–MS analysis, and TiO2/g-C3N4 showed good application possibilities in the catalytic degradation of lignin. The radical trapping and electron spin resonance outcomes supported the role of oxidative active species and its interaction in the degradation of lignin. The likely mechanism of the photocatalytic reaction was hypothesized, the degradation products were studied, and the various pathways of lignin degradation were addressed based on the experimental data.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yuping Che,Bingxin Lu,Huaxiang Chen,Jin Zhai,Kefeng Wang,Huaiqiu Chang,Zhaoyue Liu
Adding a cocatalyst to a semiconductor catalyst is often considered an effective measure to increase the efficiency of the photocatalytic hydrogen evolution reaction. Nowadays, noble metals are the state-of-the-art cocatalysts for the hydrogen evolution reaction. Due to their high cost and scarcity, it is imperative to develop cocatalysts prepared from cheap and abundant elements. Here, RuSe2 was used as an effective substitute for precious metal promoters such as Pt to enhance the efficiency of g-C3N4 for the hydrogen evolution reaction. A high efficiency of 13417.3 μmol·g–1·h–1 was obtained. It was 214 times higher than that of g-C3N4 and 2.8 times higher than that of 3%Pt/g-C3N4. Density functional theory calculations were performed. The (210) and (200) crystal faces of RuSe2 showed lower ΔGH* than Pt(111), indicating higher hydrogen evolution efficiency. Compared with the Pt cocatalyst, metallic RuSe2 cocatalysts exhibited superior performance. Meanwhile, the electrocatalytic activity was also investigated in an alkaline medium. It showed a decent electrocatalytic activity and high stability. These findings might provide a prototype to develop cheap and efficient cocatalysts for large-scale water splitting.
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高影响因子
Polymers
·
2022
·Vol. 14
·期 9
·1917
·
IF 4.967
Fue Ren,Shuyan Yang,Yang Wu,Feng Guo,Feng Zhou
An ultra-low friction and high load capacity could be obtained on the surfaces grafted by a polymer brush even at relatively slow friction speeds in aqueous lubrication environments, which has attracted widespread attention to study the lubrication mechanism of polymer brushes; however, it has yet to be fully understood. The macroscopic tribological performance of two different polymer brushes, which were prepared by the method of “grafting to” and “grafting from” and named as PLL-g-PEG and PSPMA, respectively, were investigated. The friction results demonstrated that PLL-g-PEG obtained a lower friction coefficient than polymer brush PSPMA, which was ascribed to its unique “self-healing” behavior. The lubrication film was in situ observed and the film thickness induced by the polymer brush was measured using a laboratory set for film thickness measurement apparatus based on interference technology. It was found that PSPMA exhibited excellent lubrication performance not found in PLL-g-PEG, and two film-forming mechanisms highly dependent on velocity were revealed, which may be important to interpret the lubrication mechanism of polymer brushes in aqueous lubricants.Keywords:PLL-g-PEG brushes;PSPMA brushes;friction;film formation property;hydration effect;hydrodynamic effect;lubrication mechanism
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高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Le Thi Thao,To Van Nguyen,Van Quy Nguyen,Ngoc Man Phan,Ki Jae Kim,Nguyen Nhat Huy,Nguyen Trung Dung
Wastewater containing an azo dye Orange G (OG) causes massive environmental pollution , thus it is critical to develop a highly effective, environmental-friendly, and reusable catalyst in peroxymonosulfate (PMS) activation for OG degradation. In this work, we successfully applied a magnetic MnFe 2 O 4 /α-MnO 2 hybrid fabricated by a simple hydrothermal method for OG removal in water. The characteristics of the hybrid were investigated by X-ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier transform infrared spectroscopy , Brunauer–Emmett–Teller method, vibrating sample magnetometry, electron paramagnetic resonance, thermogravimetric analysis , and X-ray photoelectron spectroscopy. The effects of operational parameters (i.e., catalytic system, catalytic dose, solution pH, and temperature) were investigated. The results exhibited that 96.8% of OG degradation was obtained with MnFe 2 O 4 /α-MnO 2 (1:9)/PMS system in 30 min regardless of solution pH changes. Furthermore, the possible reaction mechanism of the coupling system was proposed, and the degradation intermediates of OG were identified by mass spectroscopy . The radical quenching experiments and EPR tests demonstrated that SO 4 • ̶ , O 2 • ̶ , and 1 O 2 were the primary reactive oxygen species responsible for the OG degradation. The hybrid also displayed unusual stability with less than 30% loss in the OG removal after four sequential cycles. Overall, magnetic MnFe 2 O 4 /α-MnO 2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.
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高影响因子
LANGMUIR
·
2022
·
IF 4.331
Jie Han,Yao Liang,Chengxiu He,Yujia Tong,Weixing Li
A catalytic composite membrane was developed for the enhancement of esterification by lyophilization for the first time. The catalytic composite membrane was composed of a poly(vinyl alcohol) (PVA)-sodium alginate (SA) separation layer and a spongy porous catalytic layer cross-linked by PVA and 4-sulfophthalic acid (SPA). Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) results indicated the successful synthesis of the catalytic composite membrane. The membrane properties were evaluated by ethanol dehydration and esterification. The conversion rate of acetic acid reached 95.9% after 12 h. Compared with batch reactions, the conversion rate increased by 24.4%. After five cycles, the membrane still maintained outstanding catalytic activity. The resistance of mass transfer was analyzed, and the results showed that the porous structure reduced the catalytic layer resistance to total resistance from 70.27 to 32.88%. The composite membrane with a spongy porous catalytic layer exhibited superior dehydration and catalytic performance.
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高影响因子
Journal of Analytical Methods in Chemistry
·
2022
·
IF 2.594
Yanling Zhao,Yanfei Wen,Xing Hu,Bing Zhang
We proposed a colorimetric immunosensor based on g-C3N4@Fe3O4 nanocomposite-mediated transformation strategy for sensitive detection of carcinoembryonic antigen (CEA). The g-C3N4@Fe3O4 nanocomposite was synthesized and characterized by the scanning electron microscope (SEM), energy dispersive X-ray spectra (EDX), X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Fe3+ derived from g-C3N4@Fe3O4 nanocomposite could combine with sodium salicylate to form purple complex products. Based on this color development, the sandwich colorimetric immunoassay was built by utilizing g-C3N4@Fe3O4 nanocomposite as nanolabels on the microplate. With the increasement of CEA concentration, the purple color showed a gradient change. Under optimal conditions, the linearity range is 0.001–50 ng/mL with the detection limit of 0.35 pg/mL for CEA. More importantly, the colorimetric immunoassay has good selectivity, specificity, repeatability, and stability.
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高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 9
·1784-1795
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IF 1.8
Hong-jian Zhao,Yan Zhou,Ren-Jang Wu,Zhe Yu,Zhi-qiang Wu,Xu Li,Zheng-bing Han
Objective A highly active and stable composite photocatalyst which can be used in practical environmental remediation was developed. Methods g-C 3 N 4 /SnO 2 /BiPO 4 ternary composites (CN/SO/BPO) were synthesised via simple impregnation, and their texture structure, morphology, and surface composition were deeply characterized. Results In just 25 min under visible-light radiation, CN/SO/BPO almost eliminated rhodamine B, and the observed rate constant for the reaction was almost 36 and 3 times higher in comparison to that of CN/BPO and SO/BPO, respectively. Conclusions On the basis of experimental outcomes and DFT calculation, the direct Z-type structure of CN/SO/BPO lead to the improved photogenerated charge separation efficiency, as confirmed by surface photovoltage spectroscopy, electrochemical impedance spectroscopy, and transient photocurrent responses.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 12
·3214-3226
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IF 2.7
Wang Cong,Xie Qidong,Shen Wenting,Chen Zhihao,Hong Xinghua,Fu Yaqin,Si Yinsong
Graphitic carbon nitride (g-C 3 N 4 ) attract extensive attentions as an organic semiconductor. However, incomplete polymerization and low crystallinity remain a challenge for synthesizing g-C 3 N 4 with ideal structure and property. Herein the critical roles of gaseous intermediates produced at certain stage to polymerization and crystallization is investigated by venting gaseous intermediates at a fixed heating temperature. The g-C 3 N 4 vented at 230 °C demonstrates superior crystal quality and hydrogen production activity over others, inversely demonstrating the negative influence of these gaseous intermediates on the polymerization and crystallization. Crystal quality and hydrogen production rate decreases gradually when vented at 390 and 550 °C, suggesting the relatively positive effect. Venting the gaseous intermediates unfavorable to polymerization contributes significantly to orderly stacking of the 2D planes, thus greatly boosting the interlayer charge transfer and the hydrogen production rate. This venting strategy clarifies the role of staged gaseous intermediates by simply regulating the calcination process, which is important for synthesizing g-C 3 N 4 with desired microstructure and properties. Graphical abstract
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危险品化学品经营许可证（带存储）