POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Zhenyu Jiang,Zhaobei Chen,Zhonglin Luo,Biaobing Wang
A highly efficient flame retardant TFD was synthesized based on 2-thenaldehyde, furfurylamine and DOPO. When 4 % of TFD is incorporated into EP, EP/TFD-4 exhibits 38.9 % of LOI value and UL-94 V-0 rating. In cone calorimeter test, the peak of heat release rate, total heat release, total smoke production are dropped by 20 %, 9 % and 65 % respectively, and the char residue is increased by 67 % as compared with the pure EP. The P/N/S elements in TFD play important roles both in gas phase and condensed phase. The decomposition of 2-thenaldehyde and furfurylamine moieties produces NH 3 , H 2 S, H 2 O, etc., which partly leak and dilute flammable gases, but majorly participate into structural reorganization in the char layer. The degradation of DOPO group releases phosphorus-containing free radicals and phosphate-like compounds. The former quenches the chain combustion reaction, and the later promotes the formation of a stable carbon layer as a barrier effect. Benefited from the good compatability between TFD and EP, and the fine balance between the increased rigidity and the declined cross-linking density, the EP/TFDs exhibit the strikingly similar transmittance to pure EP in the range of 200–800 nm, and the improved mechanical performance in tensile, flexural, and impact tests.
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Experimental and Therapeutic Medicine
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2017
·Vol. 14
·期 4
·3798-3804
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IF 1.261
Xin Ma,Fangping Liu,Minmin Li,Zhi Li,Yuexia Lin,Rui Li,Changwen Li,Yicong Chang,Changwei Zhao,Qing Han,Qiong Zhou,Yulin Zhao,Dening Wang,Jingli Liu
In the present study, three models of acute liver injury in mice were induced via the administration of CCl4 (35 mg/kg, 24 h), acetyl‑para‑aminophenol (APAP; 200 mg/kg, 12 h) and ethanol (14 ml/kg, 8 h) to study the effect of glutathione S‑transferase A1 (GSTA1) on acute liver injury. The serum levels of alanine transaminase, aspartate transaminase and liver homogenate indicators (superoxide dismutase, glutathione and glutathione peroxidase) were significantly lower in model groups compared with the control group (P<0.01), whereas the liver homogenate indicator malondialdehyde was significantly increased (P<0.01). The expression of GSTA1 in liver was significantly decreased in the model groups compared with the control group (P<0.01). GSTA1 protein content was 3.8, 1.3 and 2.6 times lower in the CCl4, APAP and ethanol model groups, respectively. Furthermore, GSTA1 mRNA expression levels decreased by 4.9, 2.1 and 3.7 times in the CCl4, APAP and ethanol model groups, respectively. Among the three models, the injury induced by CCl4 was the most marked, followed by ethanol and finally APAP. These results suggest that GSTA1 may be released by the liver and serve as an antioxidant in the prevention of liver damage.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Peng-Fei Qiu,Xiu-Niang Tan,Zai-Yin Huang,Yan Zhou
The low conductivity of many traditional metal–organic-framework (MOF)-based electrode limits their developments in the field of electrochemical energy storage and still of great challenge. The controllable preparation of various kinds of nanomaterials using thiol-functionalized MOF shows great prospects. In this work, a thiol-functionalized metal–organic framework sheet structure ( Co-MOF/NF ) on nickel foam was successfully prepared by in situ interfacial growth synthesis, which was transformed into its derivatives S-doped β-Co(OH) 2 nanoflowers Co-x/NF ( x = 1, 2 and 6) in different concentrations of KOH solutions through ion etching/exchange reaction. The pristine thiol-functionalized Co-MOF/NF and its derivatives Co-x/NF ( x = 1, 2 and 6) nanoflower-like arrays could be used as positive electrode materials for effective supercapacitors. Among them, the transformation of the nanoflower-like Co-1/NF electrode exhibits excellent electrochemical properties with high areal capacitance (1925 ± 23 mF/cm 2 at 1 mA/cm 2 ), good rate performance, excellent conductivity and decent cycling stability. The Co-1//AC ASC device provides a high energy density of 0.176 mWh/cm 2 (92.6 Wh/kg) at a power density of 0.745 mW/cm 2 (392.1 W/kg). And this Co-1//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This study provides a new strategy for the pristine thiol-functionalized MOF and its conversion nanostructures for energy storage applications.
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Small
·
2024
·
IF 13
Feng Sun,Zhihui Ma,Shenghai Xin,Yidi Fu,Ping Li,Jianbin Li,Qi Wan,Xuanhui Qu
Silicon (Si) anode is a promising anode material for all-solid-state lithium batteries with ultra-high theoretical specific capacity and low lithium dendrite risk. However, the inevitable vast volume expansion of Si anode during charge/discharge is recognized as a major limitation preventing its commercial application. Herein, an N, S self-doped amorphous carbon layer coated on porous micron-sized Si (p-mSi@C) is designed to construct an electron/ion conducting network while ensuring structural and interfacial stability. Uneven distribution of von mises stresses during p-mSi lithiation leads to irregular volume expansion and even fragmentation. Meanwhile, the growth of by-products at the interface between p-mSi and electrolyte contact leads to a rapid capacity decay. Compared to p-mSi anode, p-mSi@C reduces the risk of fragmentation thanks to the stress-absorbing effect of amorphous carbon, delivering excellent electrochemical performance (2679.65 mAh g −1 at 0.2 mA cm −2 with initial coulombic efficiency of 84%). More importantly, the chemical failure mechanisms of p-mSi and p-mSi@C composite anodes are revealed through structural characterization, chemical analysis, and simulation, which provides the necessary theoretical guidance for practicalization.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Ruihong Guo,Yujuan Zhang,Xiutang Zhang,Hong Yang,Tuoping Hu
The development of efficient bifunctional catalysts is the key technology to replace oxygen evolution reaction (OER) with hydrazine oxidation reaction (HzOR) with lower theoretical potential to achieve high efficiency and energy-saving hydrogen production . In this work, the Co 0·52 Cu 0·48 /Cu@S–C (−1.3 V) composite with flower-like array was prepared by two-step electrodeposition coupled pyrolysis method. The electrochemical measurements showed that the driving voltages of the optimal composite for HzOR and hydrogen evolution reaction (HER) are respectively −118 mV and 47 mV at a current density (j) of 10 mA cm −2 . The excellent performance of Co 0·52 Cu 0·48 /Cu@S–C (−1.3 V) composite is attributed to the fact that the flower-like structure exposes more active areas and facilitates the diffusion of electrolyte, the strong electron interaction between Co 0·52 Cu 0·48 /Cu and S –C substrate, which can be verified by X-ray photoelectron spectroscopy (XPS), enhances the electrical conductivity , the Co 0·52 Cu 0·48 /Cu heterogeneous interface reduces the water dissociation barrier and facilitates the dehydrogenation kinetics of N 2 H 4 determined by density functional theory (DFT) calculations. Due to the excellent performance of Co 0·52 Cu 0·48 /Cu@S–C (−1.3 V), the overall hydrazine splitting (OHzS) electrolytic cell was constructed with Co 0·52 Cu 0·48 /Cu@S–C (−1.3 V) as electrodes. The results showed the voltages required by the cell are 36, 210 and 282 mV at the current density values of 10, 100 and 200 mA cm −2 respectively, showing that Co 0·52 Cu 0·48 /Cu@S–C (−1.3 V) can be used for energy-saving hydrogen production by hydrazine assisted water electrolysis.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Jing Zhang,Honghui Wang,Yingmin Liao,Yan Li
The co-contamination of heavy metal ions and organic pollutants has posed a threat to human health. Herein, this study investigated the intermolecular interactions of bisphenol S (BPS) and hexavalent chromium (Cr(VI)) under both individual and coexisting conditions, with alpha-glucosidase (AG), a key enzyme in carbohydrate metabolism, and the corresponding effects on the structure and function of AG. Multiple spectroscopic and molecular docking methods were employed to conduct the investigation in vitro and in silico . The results indicated that both BPS and Cr(VI) quenched the fluorescence of AG via a combined static and dynamic quenching processes. At 310 K, the binding constants of AG with BPS in the AG-BPS and (AG-Cr(VI))-BPS systems were 1.84 × 10 4 and 2.03 × 10 4 L mol −1 , and the binding constants of AG with Cr(VI) in the AG-Cr(VI) and (AG-BPS)-Cr(VI) systems were 6.14 × 10 3 and 4.35 × 10 3 L mol −1 . Cr(VI) could significantly affect the binding site of BPS in AG, while BPS had a minimal impact on the binding site of Cr(VI) in AG. BPS and Cr(VI) caused varied structural alterations of AG, and the impact of their coexistence on the structure of AG was related to the order in which they were added. Both BPS and Cr(VI) had a concentration-related effect on AG activity. This study provides valuable insights into the molecular mechanisms underlying the combined toxic effects of BPS and Cr(VI) on AG, highlighting the potential health risks associated with their environmental co-exposure.
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INORGANIC CHEMISTRY
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2025
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IF 4.7
Xuan Miao,Xiao Bai,Peng Zhang,Bolong Wang,Shuyan Wang,Yuzhu Yang,Zenggang Lin,Sixia Li,Binbin Wang,Weisheng Liu
Incorporating two-phase heterojunctions with matching band structures represents a promising strategy for developing photocatalysts with enhanced efficiency. This work prefers a novel approach that employs a template-assisted strategy based on a porous structured UCCN@CeO2 0D/2D S-scheme heterojunction. The proposed method aims to improve photocatalytic activity by harnessing the synergistic effects of monodispersed CeO2 nanoparticles and ultrathin N-defect CN nanosheets. The catalyst demonstrates a remarkable photocatalytic hydrogen evolution rate, reaching an impressive value of 5.59 mmol h–1 g–1 when subjected to simulated sunlight irradiation. Furthermore, the photocatalyst maintains a substantial activity level, yielding 2.35 mmol h–1 g–1 under visible light (≥400 nm). The significant improvement in the photocatalytic performance of the UCCN@CeO2 catalyst is attributed to the unique structural design and effective charge separation facilitated by the S-scheme mechanism. Kelvin probe force microscopy, theoretical calculations, and femtosecond transient absorption spectroscopy affirm the efficient charge transportation across the catalyst interface. Additionally, electron spin resonance spectroscopy measurements further support the charge transfer pathway in the S-scheme. This research presents an innovative approach for designing and developing CN-based catalysts featuring S-scheme heterojunctions, aiming to improve their efficiency and practical use in photocatalytic applications.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·
IF 1.5
Lei Miao,Zhang Jun,Liu Chang,Guo Junpeng,Li Ye
Herein, S-nZVI was synthesized to remove U(VI) from seawater. At a S/Fe ratio of 0.18 and pH of 5, adsorption of U(VI) reached equilibrium after 20 min with the removal rate of 97.93%. And the maximum adsorption capacity obtained by Langmuir isothermal model was 1177.09 mg/g. Moreover, S-nZVI exhibited selectivity in the presence of interfering ions, regeneration performance in 5 reuse cycles, and high removal efficiency in actual seawater. Mechanism investigations showed that UO 2 2+ uniformly adsorbed on S-nZVI surface was irreversibly reduced and generated UO 2 precipitates due to the electrons provided by S 2− , S 2 2− and Fe(II).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Xiaojiao Kang,Tianyu Gao,Wei Lü,Ming Jiang,Hongbo Zhu,Hongcheng Wang
Ternary I-III-VI quantum dots (QDs) are promising substitutions to Pb and Cd chalcogenide QDs in various applications such as LED, biodetection and sensing. It is urgent to explore near-infrared (NIR) emitting QDs with the advantages of low-cost synthesis and nontoxicity. Herein, water-soluble NIR Cu-In-S/ZnS (CIS/ZnS) QDs were obtained utilizing thioglycolic acid (TGA) and polyethyleneimine (PEI) as the stabilizing molecules in a commercial pressure cooker. Moreover, we detailedly investigated the influence factors on the PL property of CIS QDs and CIS/ZnS QDs including species of sulfur source, reaction time, pH, the dosage of TGA, PEI, Na 2 S, number of ZnS coating layers and the molar ratio of Cu/In. These QDs with adjusting Cu/In ratios show the emission maximum in the range of 710–750 nm. The maximum PL quantum yield (PLQY) of 20 % was acquired for CIS/ZnS QDs with a Cu/In ratio was 0.33/1 and three ZnS layer coating. Finally, we fabricated a NIR pc-LED lamp by using blue LED chips and CIS/ZnS QDs. The device shows a broadband NIR emission centered at 770 nm, which can be applied in night-vision system.
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Small Methods
·
2024
·
IF 10.7
Yue Jian,Litao Han,Xiangrui Kong,Tianliang Xie,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yuena Meng,Yafang Qi,Guangxing Liang,Xianghua Zhang,Zhi Zheng,Sixin Wu
High-crystalline-quality absorbers with fewer defects are crucial for further improvement of open-circuit voltage ( V OC ) and efficiency of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells. However, the preparation of high-quality CZTSSe absorbers remains challenging due to the uncontrollability of the selenization reaction and the complexity of the required selenization environment for film growth. Herein, a novel segmented control strategy for the selenization environment, specifically targeting the evaporation area of Se, to regulate the selenization reactions and improve the absorber quality is proposed. The large evaporation area of Se in the initial stage of the selenization provides a great evaporation and diffusion flux for Se, which facilitates rapid phase transition reactions and enables the attainment of a single-layer thin film. The reduced evaporation area of Se in the later stage creates a soft-selenization environment for grain growth, effectively suppressing the loss of Sn and promoting element homogenization. Consequently, the mitigation of Sn-related deep-level defects on the surface and in the bulk induced by element imbalance is simultaneously achieved. This leads to a significant improvement in nonradiative recombination suppression and carrier collection enhancement, thereby enhancing the V OC . As a result, the CZTSSe device delivers an impressive efficiency of 13.77% with a low V OC deficit.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Cuihuan Lv,Jinpeng Cai,Guohui Wang,Jiuxiu Chen,Hao Lai,Peilun Shen,Dianwen Liu
Organic depressants often exhibit low selectivity at high dosages, and introduce risks of concentrate dewatering. The combined depressants composed of inorganic and organic substances can significantly reduce reliance on organic depressant dosage, providing a promising solution to this challenge. In order to achieve highly efficient separation of sphalerite and pyrite in the CuSO 4 -butyl xanthate (PBX) flotation system, the combined depressant Fe 2+ / baicalin (BCL) was innovatively employed to inhibit copper-activated pyrite. The flotation tests indicate that compared with the single depressant BCL, the combined depressant Fe 2+ /BCL demonstrates superior selective inhibitory effects on copper-activated pyrite. For artificially mixed ores, a zinc concentrate is obtained with a zinc grade of 62.33 % and a zinc recovery of 93.86 % when the combined depressant of 10 mg/L Fe 2+ and 5 mg/L BCL are used, and the separation efficiency is significantly improved from 40.66 to 79.69 %. Adsorption characteristic studies indicated that BCL exhibits stronger affinity for copper-activated pyrite than for sphalerite. The introduced Fe 2+ provide additional active sites, thereby enhancing the depression effect on copper-activated pyrite. Following Fe 2+ /BCL modification, the adsorption of PBX on copper-activated pyrite was hindered, while having no substantial impact of that on sphalerite, which is also confirmed by molecular dynamics simulations. Therefore, the combined depressant Fe 2+ /BCL markedly widened the hydrophobicity difference between sphalerite and pyrite, creating the potential for their effective separation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xinyi Chi,Mingyu Dou,Guang Yang,Ruixin Yang,Zunhao Wang,Hengyi Wang,Hua Yang,Wenning Yang,Erkang Liu,Jianmin Dou
The development of efficient and durable non-noble metal photocatalysts remains a major challenge, primarily owing to the fast recombination of photogenerated charge carriers and sluggish interfacial reaction kinetics. In this work, a ternary composite photocatalytic system, CdLa 2 S 4 /Mn 0.5 Cd 0.5 S-Co x P (CdLa 2 S 4 /MCS-Co x P), was rationally designed and constructed by coupling the S-scheme heterojunction with the metal-semiconductor Schottky interface, aiming to synergistically enhance multi-channel charge separation and migration. The construction of an S-scheme heterojunction comprising CdLa 2 S 4 and Mn 0.5 Cd 0.5 S (MCS) significantly facilitates the spatial separation of photogenerated electrons and holes driven by the built-in electric field, while simultaneously preserving their strong redox capability. Meanwhile, the Co x P acts as both an efficient electron acceptor and proton reduction site, its Schottky barrier at the interface further lowers the energy barrier for the hydrogen evolution reaction and accelerates surface reaction kinetics. Consequently, the CdLa 2 S 4 /MCS-Co x P composite exhibits a remarkable hydrogen evolution rate of 11.04 mmol g −1 h −1 , outperforming pristine MCS and CdLa 2 S 4 by factors of 10.32 and 38.07, respectively. This study offers a practical strategy for the rational design of multi-interface photocatalytic architectures with robust redox ability.
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