RSC Advances
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2022
·Vol. 12
·期 36
·23754-23761
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IF 4.036
Jinling Gao,Tongtong Li,Mingzhe Song,Yuyao Zhao,Anxu Wang
Dispersible multi-walled carbon nanotubes (MWCNTs) in water have been widely applied in the nanotechnology field. This study reports a water-soluble N,O-carboxymethyl chitosan(N,O-CMCS) assisted individual dispersion of oxidized multi-walled carbon nanotubes (oMWCNTs) as a dispersant. First, the dispersing agent N,O-CMCS was successfully synthesized using the nucleophilic substitution of deacetylated chitosan with chloroacetic acid in an alkaline solution. It was further confirmed using Fourier transform infrared spectroscopy (FTIR). Second, after the treatment with the concentrated hydrochloric acid, the prepared oMWCNTs were dispersed in an aqueous solution of N,O-CMCS under ultrasonic vibrations. Finally, the dispersed aqueous solution was subjected to centrifugation to collect the supernatant of individually dispersed N,O-CMCS/oMWCNTs. In addition, transmission electron microscopy (TEM) further confirmed that the purity of oMWCNTs was improved after the acidification progress. Besides, the stability of the dispersion solution was evidenced by digital photos of oMWCNTs dispersed by N,O-CMCS before and after. Moreover, the UV-vis spectrum (the characteristic peak of dispersed oMWCNTs downshifted 13 nm) showed that the supernatant was enriched by the individual oMWCNTs. In particular, the analytical results of FTIR (the –NH2 band of N,O-CMCS downshifted 7 cm−1), resonance Raman spectroscopy (the ID/IG ratio of dispersed oMWCNTs only increased 0.14), and XRD identified the formation of a non-convalent interaction between N,O-CMCS and oMWCNTs. These findings reveal the dispersing nature of N,O-CMCS towards oMWCNTs in water media.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Xiaomin Xie,Jingfan Yan,Qiong Wu,Tianyu Wang,Fumin Chu,Sen Yang
Inspired by Namib Desert beetle’s back which is patterned with different wetting properties, hydrophobic porous polystyrene microspheres embedded with hydrophilic surface micro-regions (HPHs) were designed and fabricated by the radical copolymerization in the W 1 /O/W 2 double Pickering emulsions with high internal water phase. The synergistic effect of the hydrophobic surface and the hydrophilic surface micro-regions results in HPHs exhibiting superior performances for separating both surfactant-free and surfactant-stabilized O/W emulsions. After 60 s hand-shaking, the oil was absorbed and stored within HPHs which could be separated from the water using a 600-mesh sieve, and the TOC values of purified water could be reduced to 2.06 ± 0.06–67.38 ± 2.02 ppm when the initial oil content was 1 vol%. Meanwhile, HPHs could be recovered and reused through a simple treatment. The excellent oil removal efficiency was kept even after 50 cycles. High oil removal efficiency, general applicability, easy operation and excellent recyclability endow HPHs with great potential for practical applications. And this work provides a facile and general way to prepare porous polymer microspheres with wettability contrast surfaces.
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FOOD AND CHEMICAL TOXICOLOGY
·
2022
·
IF 5.572
Xiangyuan Liu,Li Song
Epidemiologic studies have revealed that Dichlorodiphenyltrichloroethane (DDT) and its metabolites are associated with liver diseases. However, there has been little emphasis on the mechanism underlying liver toxicity of o,p’- DDT and relevant effective inhibitors investigation. This study indicated o,p’- DDT exposure significantly decreased cell viability and promoted lactate dehydrogenase (LDH) release based on the investigation of cytotoxicity by trypan blue exclusion counts, MTT, and lactate dehydrogenase (LDH) assays. Comet, micronuclei, and DNA-protein crosslinks (DPC) assays demonstrated o,p’- DDT exposure increased the comet parameters, micronuclei frequency, and DPC coefficient. Meanwhile, we found o,p’- DDT induced mitochondria-dependent apoptosis , which is characterized by the loss of mitochondrial membrane potential (Δψm), decreased Bcl-2 expression, and increased protein levels of Bax, cytochrome c , activated-caspase-9, and activated-caspase-3. Furthermore, o,p’- DDT induced reactive oxygen species (ROS) overproduction, decreased the protein levels of nuclear factor erythroid-derived 2-like 2 (Nrf2) in the nuclear, and enhanced the expression of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase . However, quercetin treatment significantly antagonized o,p’- DDT-induced cytotoxicity, genotoxicity , and apoptosis as well as effects on ROS, Nrf2, and NADPH oxidase. Taken together, these findings suggested quercetin could alleviate o,p’- DDT-induced toxicity in HL-7702 cells via inhibiting ROS production, which is modulated by down-regulating nuclear Nrf2 levels and NADPH oxidase expression.
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Food & Function
·
2022
·Vol. 13
·期 5
·2618-2630
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IF 6.317
Xin Hao,Jiahong Xie,Yuting Li,Wei Chen
Anthocyanins are natural products that display diverse bioactivities but are limited in their applications by low stability and bioavailability. Acylated anthocyanins are found to possess higher stability, while their bioactivities are still obscure. In this study, acetylation of pelargonidin-3-O-glucoside (Pg3G) was catalyzed by Candida antarctica lipase B (CALB) for the first time, with a conversion rate up to 88.77% over 48 h. The acetylated product was identified as pelargonidin-3-O-(6′′-acetyl)-glucoside and its properties were detected. Notably, acetylated Pg3G (Ace Pg3G) possessed better thermostability and lipophilicity than Pg3G, indicating a longer retention time at physiological pH and facilitating penetration into the lipophilic medium as well as the cell membrane. Most importantly, Ace Pg3G exerted better alleviation effects against H2O2-induced oxidative hepatic damage than parent Pg3G via activating the Nrf2/ARE signaling pathway and upregulating the expressions of the downstream phase II detoxification enzymes GCLC and HO-1, thereby reversing redox imbalance and enhancing cell survival. Overall, our research unveiled the better health benefits of Ace Pg3G and also provided new insights about the applications of acetylated anthocyanins in food, cosmetic, and pharmaceutical products.
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Jinming Dai,Mei Bai,Changzhu Li,Haiying Cui,Lin Lin
In this work, different concentrations of sodium dodecyl sulfate (SDS) were applied to improve the electrospinning performance of gelatin-stabilized emulsions. With the increase of SDS content, the average droplet size of emulsions became smaller and the uniformity improved. Besides, the addition of SDS could increase the apparent viscosity and viscoelasticity of the emulsion via inducing extensive association of gelatin molecules. These changes presented a positive impact on the morphology and structure of the electrospun fibers. By concentration optimization, the core-shell nanofibers were successfully fabricated with the assist of 1% (w/v) SDS with a beadless and uniform structure. Especially, the SDS crosslinking could also prevent the gelling of gelatin solution at the needle via changing the protein conformation, thereby improving the spinnability of gelatin solution with continuity. However, further increasing the SDS concentration to 2% (w/v) would cause conglutination between fibers and agglomeration of oil phase. It was due to the increased viscous resistance of emulsion resulting in insufficient jet stretching at high concentration of SDS. Finally, the gelatin nanofibers showed an enhanced structural stability under the crosslinking of SDS during 15-d storage. Hence, this study presents a practical strategy for the fabrication of bio-based nano-carriers.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kang-Hui Hu,Chao-Qiong Zhu,Bao-Ping Zheng,Lang Qiu,Fang Wan,Yang Song,Ben-He Zhong,Zhen-Guo Wu,Xiao-Dong Guo
Li-rich Mn-based oxide cathodes are one of the most promising cathode candidates for high energy density over 400 Wh kg −1 , deriving from oxygen redox of Li-O-Li configuration. However, the deep oxygen oxidation would lead to the formation of peroxides and superoxides (O 2 n − , 0 < n ≤ 2) and even oxygen (O 2 ), accompanied by crystal phase transformation and structure collapse. Herein, an integrative strategy of simultaneously regulating the right amount of oxygen vacancies (OVs) and B-atom doping is proposed to achieve differentially modification of both R-3 m and C2/m phases. Firstly, Rietveld refinement, HRTEM and in situ XRD results reveal that the linear increase of OVs content is achieved by regulating the amount of BN and the selective introduction of OVs inside the C2/m phase makes the oxygen partial pressure lower in the weak O-Li-O bonds of TM-layer and inhibits oxygen release at over 4.5 V. Meanwhile, kinetics test shows oxygen defects would accelerate the Li + diffusion and reduce the electronic impedance driven by uneven local charge distribution. Secondly, lattice analysis shows the strong covalent B-O bonds located at the tetrahedral site not only prevent the overoxidation of the oxygen atoms at high voltage, but also hinder the migration of Mn atoms through tetrahedral sites, which effectively avoids the damage of the crystal structure. As a result, the modified cathode exhibits the excellent discharge specific capacity of 272 mA h g −1 at 0.1C, higher rate performance of 145 mA h g −1 at 5C, an outstanding capacity retention rate of 93% at 1C and lower voltage decay value of 0.43 V after 200 cycles. This promising strategy could simultaneously achieve both high energy density and superior cycling stability and help to advance industrial application of Li-rich Mn-based Cathodes.
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ACS Applied Nano Materials
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2023
·
IF 5.9
Zongwei Guo,Zhao Wang,Jiajun Ma,Lin Jin,Yuhui Ao
Introducing two-dimensional (2D) nanoreinforced materials on the surface of carbon fibers (CFs) is a promising strategy for overcoming the chemical inertness of CFs. However, disordered alignment and uneven dispersion of 2D nanoreinforced materials on the CF surface are the most critical issues that must be addressed. Herein, MXene (M) was functionalized using graphene oxide (G) to produce intercalated 2D reinforcement materials, and robust Ti–O–C covalent bonds were introduced to ensure that M and G have strong binding forces. An interface layer with a more ordered and compact “brick-and-mortar” structure was developed on the CF surface to obtain CF composites with high strength and toughness. Owing to the structure superiority, robust Ti–O–C covalent bonding, and abundant π–π interactions, the optimal CF composites achieved high strength and toughness, with a tensile strength of 1587 MPa and a toughness of 45 MJ m–3. Meanwhile, the interlaminar shear and flexural strengths increased to 82 and 1178 MPa, respectively. The reinforcing mechanisms of the unique interface layer on CF composites were systematically investigated via data analysis and modeling. This study provides a constructive design inspiration for fabricating high-performance CF-reinforced polymer composites, considerably expanding their applications.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2021
·
IF 4.556
Sam Al-Dalali,Fuping Zheng,Baoguo Sun,Talmizur Rahman,Feng Chen
Aging is an essential step for enriching the aroma profiles of Chinese vinegar. This study aimed to track the volatile flavor changes in the same batch of Chinese vinegar for the first time during two years of aging with the aid of HS-SPME-GC–MS. The aroma-active compounds were characterized at 0, 6, and 12 months of aging using GC-O coupled with a modified frequency method. A total of 67 volatile compounds and 30 aroma-active compounds were identified during the different stages of aging. Most alcohols, esters, ketones, acids, and phenols decreased during the aging from 628.4, 105.4, 132.1, 22.1, and 21.4 μg/L at 0 month to 228.7, 7.2, 9.69, 17.24, and 11.6 μg/L at 24 months separately, except aldehydes and pyrazines, which showed slight increases. Many aroma-active compounds were generated during the aging, such as methional, trimethylpyrazine, acetophenone, and 2-acetyl-3-ethylpyrazine, while pyrazines were formed during 24 months of aging. Three aroma-active compounds with high odor activity values (OAVs) showed significant contributions to the aroma profile of vinegar, which included isovaleric acid (2743, 340, and 3139), 4-ethylguaiacol (580, 429, and 516), and γ -nonalactone (324, 640, and 442) at 0, 6, and 12 months of aging, respectively.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Wang Song,Qianni Cheng,Li Han,Jiawei Ji,Yandi Cai,Wei Tan,Jingfang Sun,Changjin Tang,Lin Dong
Manganese oxide-based catalysts exhibit excellent low-temperature denitration efficiency, making them potential candidates for application. Herein, the relationship between reaction stability and phase structure for MnO 2 , Mn 2 O 3 and Mn 3 O 4 was disclosed. The NO conversion for Mn 2 O 3 drastically reduced after 120 h reaction, while minor decline was detected for MnO 2 and Mn 3 O 4 . Based on dedicate qualitative and quantitative analyses on the deposits over catalyst surface, deactivation trigged by ammonium nitrate (AN) deposition was confirmed. Different from penta-coordinated Mn 4+ on MnO 2 (110) and tri-coordinated Mn 2+ , penta-coordinated Mn 4+ on Mn 3 O 4 (101), the unique tetra-coordinated Mn 3+ on Mn 2 O 3 (200) could stabilize the nitrates and make it difficult to be removed via decomposition or reaction and accumulate continuously, which resulted in the significant deactivation. This research could not only unveil the poisoning mechanism of MnO x based catalysts, but also provide new insights into the relationship between the catalytic stability and surface Mn-O microstructure.
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Catalysts
·
2023
·Vol. 13
·期 12
·1512
·
IF 3.9
Wenhao Si,Fei Qi,Kangjun Wang,Qiang Wang,Zequan Zeng,Yuting Niu,Zhanggen Huang
With the development of coal chemical technology, a large amount of gasification slag and wastewater are produced through coal gasification. Efficient gasification slag utilization and wastewater treatment have attracted much attention. In this study, gasification slag was modified and used as a low-cost and efficient catalyst to activate persulfate for acetaminophen degradation. Via the analysis of high-resolution X-ray photoelectron spectroscopy, the surfaces of nitric acid and calcined modified gasification slag retained a considerable number of carbonyl and graphite N functional groups. These proved to be effective active sites for the activation of persulfate. X-ray diffraction analysis revealed that the gasification slag was composed of carbon and SiO2. The evaluation of catalytic activity and application of density functional theory proved that the interaction between carbonyl and graphitic nitrogen significantly affected the catalyst activity. When the ratio of graphitic nitrogen to carbonyl was 1:3, the adsorption and activation of persulfate were significantly enhanced. The results of the quenching experiments also confirmed that the non-free radical pathway is the main pathway to activate persulfate using the gasification slag. This study provides a new approach to industrial waste utilization in wastewater treatment.Keywords:persulfate;gasification slag;nonradical oxidation;acetaminophen
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2026
·
IF 4.7
Tao Guo,Qiulin Niu,Lu Jing,Tao Zhong,Chenyi Zhu,Binghui Wu,Shengfeng Zhang,Shibo Guo
To improve h-BN dispersion and the local interfacial environment in WC-based cemented carbides, an h-BN@Al₂O₃ composite powder was prepared by heterogeneous nucleation and calcination, with h-BN as the designed core phase and Al₂O₃ as the designed outer-layer component. The composite powder was incorporated into WC-based cemented carbides consolidated by spark plasma sintering (SPS), and the effects of powder content and sintering temperature on phase composition, microstructure, mechanical properties, and densification characteristics were examined. The h-BN@Al₂O₃ content was closely related to WC grain size, microstructural uniformity, and porosity. At 1300 °C, the specimen containing 5 vol% h-BN@Al₂O₃ had a fine, relatively homogeneous microstructure with few visible pores; higher additions increased porosity and local particle agglomeration. For the 5 vol% composition, raising the sintering temperature from 1100 to 1400 °C increased the relative density and reduced visible porosity. At 1500 °C, local WC grain coarsening, microstructural inhomogeneity, and residual porosity increased, accompanied by lower mechanical properties. The best overall performance was obtained with 5 vol% h-BN@Al₂O₃ at 1400 °C: a relative density of 99.1 ± 0.4%, flexural strength of 871.3 ± 26 MPa, Vickers hardness of 1912.1 ± 38 HV, and fracture toughness of 9.86 ± 0.2 MPa·m 1/2 .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ying Kang,Xingmei Lu,Junli Xu,Qing Zhou,Guangjin Zhang,Jiayu Xin,Dongxia Yan,Ibrahim E.I. Tantawy E.I. Sayed
Transforming lignin into aromatic monomers is critically attractive to develop green and sustainable energy supplies. However, the usage of the additional catalysts like metal or base/acid is commonly limited by the caused repolymerized and environmental issues. The key step is to mediate electron transfer in lignin to trigger lignin C-C/C-O bonds cleavage without the catalysts mentioned above. Here, we report that the ionic liquids [BMim][ClO 4 ] was found to trigger lignin electron transfer to cleave the C-C/C-O bonds for aromatic monomers without any additional catalyst. The proton transfer from [BMim] + to [ClO 4 ] − could polarize the anion and decrease its structure stability, upon which the active hydroxyl radical generated and induced lignin C-C/C-O bonds fragmentation via free radical-mediated routes with the assistance of photothermal synergism. About 4.4 wt% yields of aromatic monomers, mainly composed of vanillin and acetosyringone , are afforded in [BMim][ClO 4 ] under UV-light irradiation in the air at 80 °C. This work opens the way to produce value-added aromatic monomers from lignin using an eco-friendly, energy-efficient, and simple route that may contribute to the sustainable utilization of renewable natural resources.
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