WATER AIR AND SOIL POLLUTION
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2024
·Vol. 235
·期 7
·1-19
·
IF 3.8
Wu Qian,Liu Zhen,He Liqiong,Xiao Xilin,Tan Yan
As a kind of emerging contaminant, microplastics (MPs) widely exist in environments around the world and may carry other chemical pollutants. Besides, radioactive pollutants in water are getting more and more attention due to the discharge of wastewater from the Fukushima nuclear power plant. Among them, Uranium is an important fuel substance in nuclear power plants, which has toxicity of radioactivity and heavy metals. In order to research the interaction between MPs and uranium in water, batch experiments were conducted to study the adsorption behavior of radioactive heavy metal uranium (U(VI)) by ordinary PET MPs. The results showed that the adsorption amount of U(VI) onto PET increased (69.02%) after aging. The kinetic adsorption behavior of U(VI) could be explained by pseudo-second-order and Elovich models, and the isothermal adsorption behavior of U(VI) was well fitted by Langmuir and Sips models. The adsorption amounts were in the order of aged PET > virgin PET and ultrapure water > simulated freshwater. Besides, external diffusion and internal diffusion were included in the adsorption process. The adsorption capacity was affected by pH and salinity. The adsorption mechanisms included pore filling, electrostatic interaction, and surface complexation. The properties of MPs and the environment are the main factors affecting the adsorption process. The study elucidates the adsorption mechanism of U(VI) onto MPs in ultrapure water and simulated freshwater, aiming to assess the potential risk to aquatic environments where natural MPs and uranium ions coexist. Graphical Abstract
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JOM
·
2024
·
IF 2.1
Zhao Junkai,Wang Jiaru,Liu Siming,Fang Zhao,Yu Juan
The exhaustion of conventional nickel and cobalt ores has resulted in the rapid rising of the cost of cathode materials, which has seriously restricted the further development of the electric vehicle industry. Considering the whole production chain from ores to cathode materials, the efficient utilization of low-grade complex resources and simplifying the process can significantly reduce the cost. In this work, a material-oriented metallurgical strategy has been proposed for the direct preparation of LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode material from low-nickel matte. This novel process consists of selective sulfuric acid leaching, directional lixivium purification, and material preparation, omitting the steps of preparing pure metal salts. In total, 94.18% of Ni and 96.24% of Co in the low-nickel matte can be effectively utilized to prepare LiNi 0.8 Co 0.15 Al 0.05 O 2 , and this cathode material shows comparable electrochemical properties to that prepared from pure chemical reagents, verifying the feasibility of the strategy.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-14
·
IF 10.6
Wu Han,Ye Jinfa,Zhang Minjie,Zhang Lingyu,Lin Sijie,Li Qingjian,Liu Yanbo,Han Yun,Huang Caihong,Wu Yiming,Cheng Yuhang,Cai Shundong,Ke Lang,Liu Gang,Li Wei,Chu Chengchao
Corneal neovascularization (CNV) is one of the common blinding factors worldwide, leading to reduced vision or even blindness. However, current treatments such as surgical intervention and anti-VEGF agent therapy still have some shortcomings or evoke some adverse effects. Recently, SU6668, an inhibitor targeting angiogenic tyrosine kinases, has demonstrated growth inhibition of neovascularization. But the hydrophobicity and low ocular bioavailability limit its application in cornea. Hereby, we proposed the preparation of SU6668 pure nanoparticles (NanoSU6668; size ~135 nm) using a super-stable pure-nanomedicine formulation technology (SPFT), which possessed uniform particle size and excellent aqueous dispersion at 1 mg/mL. Furthermore, mesenchymal stem cell membrane vesicle (MSCm) was coated on the surface of NanoSU6668, and then conjugated with TAT cell penetrating peptide, preparing multifunctional TAT-MSCm@NanoSU6668 (T-MNS). The T-MNS at a concentration of 200 µg/mL was treated for CNV via eye drops, and accumulated in blood vessels with a high targeting performance, resulting in elimination of blood vessels and recovery of cornea transparency after 4 days of treatment. Meanwhile, drug safety test confirmed that T-MNS did not cause any damage to cornea, retina and other eye tissues. In conclusion, the T-MNS eye drop had the potential to treat CNV effectively and safely in a low dosing frequency, which broke new ground for CNV theranostics.
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PubMed
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2024
·
IF 3.1
Jin Shuang,Ren Yubin,Peng Cailiang,Cheng Yupeng,Liu Weili,Fu Yujie,Lv Chen,Cai Hongyao
An efficient and green method was developed using deep eutectic solvent assistance to enhance the biotransformation method of producing resveratrol from Polygonum cuspidatum Siebold & Zucc, using cellulose-based immobilised Aspergillus niger in the process. Various deep eutectic solvents (DES) were screened to obtain a superior biocatalytic effect. The increase in DES concentration aggravated the degree of cell membrane damage. Natural deep eutectic solvents (NADES) exhibited a more favourable catalytic effect than DES due to their excellent biocompatibility. This enhancement is associated with the hydrogen bonding donor components present in NADES, with catalytic ability ranking as alcohol-based > sugar-based > organic acid. CHCL/EG exhibited the maximum catalytic effect at 1.0 wt%. Under optimal conditions (pH 6.5; temperature, 29.5 °C; ratio of liquid to solid 20:1 (mL/g), and time 47 h), the resveratrol yield reached 32.79 mg/g, which was 13.06-fold to that of the untreated sample (2.51 mg/g). The residual activity of the cellulose-based microreactor was 81.46% after ten trials. The proposed method was successfully employed, demonstrating higher biocatalysis efficiencies and superior environmental protection compared to conventional solvents for resveratrol biocatalysis.
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BIOLOGIA PLANTARUM
·
2011
·Vol. 55
·期 4
·669-674
·
IF 1.582
Zeng Q. -P.,Zeng X. -M.,Yang R. -Y.,Yang X. -Q.
Although crosstalk between cytosolic and plastidic terpenoid pathways has been validated in many plant species, we report here for the first time a striking elevation of the nucleus-encoded artemisinin biosynthesis relevant DBR2 mRNA following the incubation of plants with fosmidomycin (FM). FM decreased singlet oxygen ( 1 O 2 ) scavengers such as β-carotene and α-tocopherol and subsequently invoked 1 O 2 burst. The treatment of plants with fluridone (FD) neither decreased α-tocopherol content nor triggered 1 O 2 emission. In conclusion, FM can up-regulate 1 O 2 -sensitive nuclear genes responsible for artemisinin biogenesis by mitigating the accumulation of plastidic scavenging terpenoids, thereby eliciting 1 O 2 generation and initiating 1 O 2 retrograde signaling.
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JOURNAL OF POLYMER RESEARCH
·
2011
·Vol. 18
·期 6
·1635-1643
·
IF 1.186
Wang Yang,Du Likai,Zhang Jie,Feng Shengyu
A new thermosensitive material, polydimethylsiloxane supramolecular aggregation (PDMS-SMA-1), was prepared by coupling the N -pyridin-2-yl-succinamic acid with aminopropyl-terminated polydimethylsiloxane via amidated reaction. Its structure was confirmed by FT-IR, 1 H NMR and 13 C NMR. And the FT-IR spectra, molecular dynamics simulations and density functional theory calculations supported the existence of intermolecular hydrogen bonding and π-π stacking in supramolecular aggregation and obtained its possible self-assembly structure. A combination of DSC measurements, oscillatory shear experiments, and AFM measurements was carried out to further investigate the nature of PDMS-SMA-1. The results indicated that hydrogen bonding and π-π stacking combined with phase segregation were important for the preparation of thermosensitive materials. Moreover, in order to investigate the effect of molecular weight on the thermal sensitivity and morphology of supramolecular aggregation, PDMS-SMA-2 with higher molecular weight was also synthesized. In contrast to PDMS-SMA-1, it had similar thermal properties but different morphology. All the characteristics of supramolecular aggregation suggested a much wider range of hydrogen bonding and π-π stacking motifs which could be applied in intelligent materials.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2024
·
IF 3
Ma Licheng,Qi Jungang,Gao Leqi,Wei Tao,Guo Yanhua
In this study, a cesium ion imprinted polymer (Cs(I)-IIP) was prepared by free radical thermal polymerization using 18-crown-6-ether (18C6) as ligand, methacrylic acid (MAA) as functional monomer, and ethylene glycol dimethacrylate (EGDMA) as crosslinking agent, which can be used for adsorption and separation of cesium ions from low-concentration solutions. The adsorption kinetic and isotherm results showed that the adsorption of Cs + fitted to the pseudo-second-order kinetic model and Langmuir model, indicating that the adsorption of Cs + on Cs(I)-IIP was the monolayer chemical adsorption. The maximum adsorption capacity was 84.21 mg·g − 1 . The selective adsorption properties are performed in Cs + , Li + , Na + , and K + multicomponent systems. The results showed that the Cs(I)-IIP has a high selectivity in the presence of coexisting Li + , Na + , and K + , and the selectivity coefficients ( K’ ) of Cs(I)-IIP for Cs + /Li + , Cs + /Na + , Cs + /K + are 2.1, 1.56, and 1.33, respectively. The high adsorption capacity and selectivity are attributed to the introduction of imprinting technology to form specific Cs + recognition adsorption sites, and the 18C6 cavity was easier to recognize Cs + in the competitive adsorption process. Finally, the Cs(I)-IIP can be regenerated and reused for 10 times with the adsorption capacity only decreased by 8.1%, indicating that the polymer has good reuse performance.
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MICROCHIMICA ACTA
·
2011
·Vol. 176
·期 3
·327-335
·
IF 2.578
Huang Ke-Jing,Yu Sheng,Li Jing,Wu Zhi-Wei,Wei Cai-Yun
A simple, cost-effective and efficient method was developed for the determination of glycine, gamma-aminobutyrate and taurine in rat brain using graphene as a sorbent for solid-phase extraction. The analytes were eluted from a graphene-packed solid-phase extraction cartridge with methanol, derivatized at their amino groups with the fluorescent label 4-carboxy-2,6-dimethylquinoline N-hydroxysuccinimide ester, and then separated and fluorescently detected by HPLC. The type and volume of eluent, sample pH, extraction time and sample volume were optimized with respect to sensitivity and precision. Under optimal conditions, linear response is obtained in the concentration range from 0.1 to 50 μg g−1, with correlation coefficients of >0.990. The limits of detection are 23.4 ng g −1 (gamma-aminobutyrate), 45.3 ng g −1 (glycine) and 67.5 ng g −1 (taurine) (S/N = 3). The results reveal the potential of graphene as a sorbent in the analysis of biological samples.
Representative chromatogram of NAAs derivatives obtained in rat brain samples.
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Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-15
·
IF 23.2
Bi Xiaoyu,Shi Yang,Ge Shengbo,Xu Ben Bin,Li Xia,He Ximin,Huang Runzhou
Reduced graphene oxide (rGO) and MXene have garnered significant attention due to their exceptional pseudocapacitance and electrical conductivity that are viable in energy storage applications. Nevertheless, the challenge of self-restacking between the 2D material surfaces and the tendency of MXene to oxidise has posed obstacles to their further utilisation. This prompted researchers to use cellulose nanofibre (CNF) as a prospective “bridge” to connect the two materials. This approach has been shown to prevent MXene from oxidising while facilitating GO conversion into rGO via reduction. Consequently, 3D macroporous Ti 3 C 2 T x MXene/cellulose nanofibres/reduced graphene oxide (MCG) aerogels have been successfully prepared. A breakthrough in solving the self-stacking problem and creating a sensibly designed 3D macroporous electrode structure has yielded excellent electrochemical capabilities for MCG aerogel electrodes. Specifically at 1.0 mW cm −2 power density, these electrodes have demonstrated an outstanding performance in 5000 cycles with 79.4% retention rate, favourable areal specific capacitance of 671 mF cm −2 and unparalleled energy density of 60.9 mWh cm −2 . Overall, this study offers significant perspectives on the possible uses of 2D materials, especially in terms of adjusting their structure and functionality.
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Nature Photonics
·
2024
·
IF 32.3
Zhou Yang,Guo Zhengfeng,Gu Honggang,Li Yanqiang,Song Yipeng,Liu Shiyuan,Hong Maochun,Zhao Sangen,Luo Junhua
Optical anisotropy, a spatially asymmetric light–matter interaction that manifests itself as birefringence and dichroism, is paramount for manipulating light polarization in modern optics. So far, various natural birefringent crystals are widely used, but their birefringence is limited to <0.3. Here we demonstrate a solution-processable natural crystal C 3 H 8 N 6 I 6 ·3H 2 O with giant birefringence up to 2.8 within the visible to infrared spectral region. Combining critical point analysis and the first-principles calculations, we reveal that this giant optical anisotropy mainly comes from the linear (I 3 ) − structural units in a parallel arrangement, which maximizes the difference of polarizability along the different crystallographic axes. This work highlights the potential of natural polyiodide crystals as an outstanding platform to satisfy the increasing demand for photonic applications that exploit polarization in optical communication, three-dimensional imaging, ultrahigh-resolution sensing and other tasks.
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Nuclear Science and Techniques
·
2025
·Vol. 36
·期 2
·1-13
·
IF 3.8
Xu Si-Yi,Li Dan-Yi,Wang Wen-Rui,Lin Lin,Sun Ying,Li Ji-Hao,Li Lin-Fan
High-performance MXene-based polymer nanocomposites are well-suited for various industrial applications owing to their excellent mechanical, thermal, and other properties. However, the fabrication of flame-retardant polymer/MXene nanocomposites remains challenging owing to the limited flame-retardant properties of MXene itself. This study prepared a novel MXene@Ag@PA hybrid material via radiation modification and complexation reaction. This material was used to further enhance the key properties of ethylene-vinyl acetate (EVA), such as its mechanical properties, thermal conductivity, flame retardancy, and electromagnetic shielding. The addition of two parts of this hybrid material increased the thermal conductivity of EVA by 44.2% and reduced its peak exothermic rate during combustion by 30.1% compared with pure EVA. The material also significantly reduced smoke production and increased the residue content. In the X-band, the electromagnetic shielding effectiveness of the EVA composites reached 20 dB. Moreover, the MXene@Ag@PA hybrid material could be used to further enhance the mechanical properties of EVA composites under electron-beam irradiation. Thus, this study contributes to the development of MXene-based EVA advanced materials that are fire-safe, have high strength, and exhibit good electromagnetic shielding performance for various applications.
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MICROCHIMICA ACTA
·
2011
·Vol. 175
·期 1
·193-199
·
IF 2.578
Yang Hui,Li Xin-chun,Yang Fan,Feng Jun,Lin Miao-yin,Chen Zuan-guang
We describe an efficient and easily fabricated electrochemiluminescence detection system for microchip capillary electrophoresis. A 300-μm-diameter platinum disc working electrode was embedded in a titanium tube which provides an adequate holding for working electrode and acts as counter electrode. We also have designed a simplified detection cell with a guide channel for the electrode. The integrated working-counter electrode can be easily aligned to the outlet of the separation channel through the guide channel. The functionality of the system was demonstrated by separation and detection of proline and tripropylamine. The response to proline is linear in the range from 5 μM to 5,000 μM, and the detection limit is 1.0 μM (S/N = 3). The system was further applied to the determination of chlorpromazine hydrochloride in pharmaceutical formulations. The system is believed to have potential applications in pharmaceutical analysis.
We described an efficient and easily fabricated electrochemiluminescence detection system for microchip capillary electrophoresis. The functionality of the system was demonstrated by separation and detection of proline and tripropylamine. The response to proline is linear in the range from 5 μM to 5,000 μM, and the detection limit is 1.0 μM (S/N = 3).
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