JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Sihan Li,Yingqing Zhan,Jie Liu,Xinyue Duan,Junlei Tang,Wei Zhao,Ping Zhang
The practical application of poly(aryl piperidinium) AEMs in water electrolysis is constrained by two major technical bottlenecks: (1) conformational distortion of the piperidine group reducing alkaline stability; (2) tight packing of polymer main chain hindering OH − transport. In this study, the noncoplanar V-shaped Tröger Base-Carbazole derivative, 2,8-di( N -carbazolyl)-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine (CTB), was designed and introduced into poly(aryl piperidinium) chain, thus obtaining a series of hyperbranched AEMs. Compared with linear polymer chain, the unique V-shaped three-dimensional structure in CTB inhibited tight packing of polymer and increased free volume within the membrane, thereby effectively enhancing the migration rate of OH − . At 80 °C, the QPCTB-PEG-TP-5 achieved a high ionic conductivity of 159.79 mS/cm with a low ion exchange capacity (1.108 mmol/g), while maintaining the swelling ratio below 8.5 %. Additionally, the electrostatic potential analysis and 1 H NMR spectroscopy revealed that the bridged methylene groups in CTB protected piperidine cationic groups from Hoffmann elimination. After treatment in 1 M KOH medium at 60 °C for 1000 h, the OH − conductivity retention rate and tensile strength reached 80.72 % and 21.71 MPa, respectively. The favorable OH − conductivity, mechanical strength, and alkaline stability strongly supported the application of AEM in water electrolysis. The AEMWE equipped with QPCTB-PEG-TP-5 type AEM achieved an instantaneous current density of 608 mA/cm 2 (60 °C, 1.51 V) and operated stably for 120 h without degradation at a current density of 250 mA/cm 2 . Therefore, the molecular structure design of hyperbranched poly(aryl piperidinium) AEMs based on noncoplanar V-shaped Tröger Base-Carbazole derivative provides an effective approach to solve the dual challenge of poor alkaline stability and low ionic conductivity.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yanli Kong,Yahua Zhou,Pengjun Zhang,Yong Nie,Jiangya Ma
Arsenate [As(V)] pollution is a challenge for water treatment, and the effect of coexisting microplastics (MPs) on As(V) removal is still not clear. In this study, series novel covalently bonded organic silicon-aluminum/iron composite coagulants (CSA/F) with different Al/Fe molar ratios were prepared for enhancing As(V) removal. The effect mechanism of MPs (PS MPs and PS-COOH MPs) on As(V) removal by using CSAF coagulation was analyzed. CSAF and CSF showed significantly better As(V) removal performance than other coagulants under the same conditions, especially CSF, more than 90 % As(V) removal was achieved at dosage of 20 mg/L and pH of 4.0–8.0. Interestingly, the introduction of silane coupling agent and the increase of Fe content in CSA/F changed the Al/Fe species distribution. Charge neutralization dominant in As(V) removal by using CSA, whereas adsorption and net sweeping contributed to As(V) coagulation by using CSAF and CSF with higher iron proportion at neutral pH. 3 µm MPs were removed by net sweeping of amorphous Al/Fe hydroxides, while 26 µm MPs were charge-neutralized or surface adsorbed by coagulant hydrolysates. The aliphatic C-H and -COOH functional groups of MPs were the main sites of hydrogen bonding adsorption with the hydroxyl groups of coagulant hydrolysates. This study is conducive to mitigating the environmental toxicity of arsenic and provides new insights into the interaction mechanism between composite pollutants and coagulants in waters.
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Renle Xu,Yuhang Lou,Yanqing Gao,Shibin Shang,Zhanqian Song,Kerang Huang,Luqi Li,Lei Chen,Jian Li
To mitigate the impact of traditional chemical pesticides on environment, and achieve sustainable crop protection, 24 eco-friendly rosin-based sulfonamide derivatives were synthesized and developed. The in vitro activity assessment showed that compound 4X (Co. 4X) exhibited excellent fungicidal activity against V. mali (EC 50 = 1.106 μg/mL), marginally surpassing the positive control carbendazim (EC 50 = 1.353 μg/mL). In vivo investigations suggested that Co. 4X exhibited moderate efficacy in mitigating V. mali infection in both apple trees and apples. Physiological assessments revealed that Co. 4X induced severe ultrastructural damage to the mycelium, heightened cell membrane permeability, and inhibited SDH protein activity. Subsequent biosafety evaluations affirmed the environment-friendly of Co. 4X on Zebrafish (LC 50(96h) = 25.176 μg/mL). Toxicological research revealed that Co. 4X caused damage to the cells of Zebrafish gills, liver, and intestines, resulting in impaired respiratory, detoxification, digestion, and absorption functions of Zebrafish. In summary, the findings of this study contribute to a deeper understanding of the toxicity mechanisms of novel pesticides, decreasing environmental risks caused by traditional chemical pesticides, and improving the effective management of novel pesticide applications.
研究领域:
植物保护
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毒理学
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环境科学
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分子生物学
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DOI
PubMed
高影响因子
INTERNATIONAL POLYMER PROCESSING
·
2023
·Vol. 38
·期 4
·518-527
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IF 1.3
Yanbin Wang,Weiwei Zhang,Changlong Zhuang,Shengang Xu
In this study, a noncoplanar diimide diacid monomer (DIDA) was synthesized by direct condensation of trimellitic anhydride (TMA) with m-tolidine. The noncoplanar unit was incorporated into poly(amide-imide)s (PAIs) main chain by Yamazaki-Higashi phosphorylation of DIDA with various aromatic diamines. Encouragingly, all of the PAIs show good solubility in some common solvents such as N,N-Dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), and m-cresol. In addition, the soluble PAIs show good optical transmittances of beyond 85 % at 500 nm due to the decreased crystallization ability. On the other hand, PAIs possess good mechanical properties with tensile strengths of 72–90 MPa and tensile moduli beyond 2 GPa. Meanwhile, the designed PAIs also exhibit excellent thermal properties: their glass transition temperatures ( T g ) range from 278 to 314 °C, initial decomposition temperatures (5 % weight loss temperatures, T 5wt% ) are beyond 470 °C, coefficients of thermal expansion (CTE) are below 10 ppm/°C. The excellent mechanical and thermal properties are due to the strengthened hydrogen bonding interaction among the amide groups. Therefore, it is believed that incorporating noncoplanar unit and amide group into the polymer main chain at the same time can simultaneously improve processability, optical transparency, mechanical and thermal properties. Furthermore, it is worth noting that the char of PAI at 800 °C is as high as 72.5 %, which is one of the highest known values. When PAI was incorporated into epoxy resin, the blend passed UL94 V-0 rating due to the high charring capability of PAI.
研究领域:
聚合物科学
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材料科学
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化学工程
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消防安全
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高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6716
·
IF 3.623
Shiyu Ma,Yan Lu,Bo Wang,Jinkai Li
White LEDs were encapsulated using Cs4PbBr6quantum dots and Gd2O3:Eu red phosphor as lamp powder. Under the excitation of a GaN chip, the color coordinates of the W-LED were (0.33, 0.34), and the color temperature was 5752 K, which is close to the color coordinate and color temperature range of standard sunlight. The electric current stability was excellent with an increase in the electric current, voltage, and luminescence intensity of the quantum dots and phosphors by more than 10 times. However, the stability of the quantum dots was slightly insufficient over long working periods. The photocatalytic devices were constructed using TiO2, CsPbBr3, and NiO as an electron transport layer, light absorption layer, and catalyst, respectively. The Cs–Pb–Br-based perovskite quantum dot photocatalytic devices were constructed using a two-step spin coating method, one-step spin coating method, and full PLD technology. In order to improve the water stability of the device, a hydrophobic carbon paste and carbon film were selected as the hole transport layer. The TiO2layer and perovskite layer with different thicknesses and film forming qualities were obtained by changing the spin coating speed. The influence of the spin coating speed on the device’s performance was explored through SEM and a J–V curve to find the best spin coating process. The device constructed by the two-step spin coating method had a higher current density but no obvious increase in the current density under light, while the other two methods could obtain a more obvious light response, but the current density was very low.
研究领域:
材料科学
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光电
·
光催化
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高影响因子
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