EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Yudong Xue,Jia Tian,Lei Xu,Zhiyong Liu,Yongjia Shen,Weian Zhang
Stimulus-sensitive nanoparticles (NPs) have been established to widely adapt to remarkable abnormalities under the tumor microenvironment, which can observably enhance the therapeutic efficiency, improve the specific targeting ability and reduce the side effects. Photodynamic therapy (PDT) as a promising non-invasive and selective treatment for cancers through photodynamic reaction can profit from stimulus-sensitive NPs. Herein, a harmonious amphiphilic polymer (PEG- b -PTPPDS- b -PEG) with an extremely sensitive redox response is constructed via click chemistry between N 3 -TPPC6-N 3 , PEG-N 3 and alkynyl-containing disulfide ester for PDT. This polymer can be self-assembled into micelles with excellent stability, ultra-fast sensitivity of redox-triggered porphyrin release, and significant photodynamic anticancer performance. The redox-triggered dissociation of micelles and the release of porphyrin are much faster than common porphyrin-containing polymer. The bio-distribution and phototoxicity of micelles against A549 cells are measured and evaluated in vitro by flow cytometry, confocal scanning laser microscopy (CLSM) and MTT assay, respectively. The results reveal that PEG- b -PTPPDS- b -PEG micelles can effectively enhance the cellular uptake and cellular internalization of porphyrin and have an extremely low dark toxicity with efficient PDT towards A549 cells. This intracellular responsive nanoparticle provides a potential strategy for anticancer therapeutic application.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xueping Yu,Beibei Gao,Biao Feng,Yage Peng,Xiaoyong Jin,Gang Ni,Juan Peng,Min Yao
Modular electrochemical production (MEP) system could decouple the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), and pairing with a redox mediator (RM), respectively. Herein, Mott–Schottky Co 9 S 8 /Ni 3 S 2 heterojunction was constructed, which was employed as a RM to separate the hydrogen and oxygen production in space and time in MEP system for H 2 . The MEP system for H 2 involved a two−step electrochemical−electrochemical (EC−EC) looping process. The reversible redox reaction of Co 9 S 8 /Ni 3 S 2 was paired with HER in step 1 and subsequently paired with OER in step 2. The Mott–Schottky hetero-structures enabled the redistribution of Ni central charge and accelerated the electron transfer from semiconductor Ni 3 S 2 to metallic Co 9 S 8 on the interface. This made the formation of Lewis acid at the Ni 3 S 2 in the heterojunction , which bonded with the OH − Lewis base, facilitating the electrochemical redox kinetics of Co 9 S 8 /Ni 3 S 2 . Thus, the Co 9 S 8 /Ni 3 S 2 RM presented a high area capacitance (29.60 F/cm 2 at 5 mA/cm 2 ), and an excellent stability upon operation over 5000 cycles (15 days). The MEP system can continuously produce H 2 for 1502 s at 10 mA/cm 2 with a Faradaic efficiency of 100%. The MEP system possessed a high energy efficiency (83%), requiring a lower cell voltage than that of a conventional water electrolysis system. The MEP system for H 2 enabled flexible utilization of renewable solar energy by photovoltaic (PV) panels, thereby facilitating solar-to-hydrogen conversion.
研究领域:
能源科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Kexin Yin,Yanan Shang,Dongdong Chen,Baoyu Gao,Qinyan Yue,Xing Xu
Versatile persulfate-based catalytic mechanisms induced by highly-effective single atom catalysts (SACs) have been intensively reported, which was mainly ascribed to the versatile coordinated-structures of SACs. However, the origin of these different mechanisms from the specific properties of pollutants has been ignored. In this work, eight kinds of pollutants were selected and the half-wave potential (φ 1/2 ) values representing their redox potentials were determined. A good correlation between the redox potential characteristics of pollutants and their oxidation performances/pathways in manganese single-atom catalyst (Mn-SAC)/PMS system can be confirmed. The φ 1/2 values of different pollutants showed a good correlation with the energy gaps between the pollutants and Mn-SAC/PMS complexes as well as their electrophilicity indexes, which confirmed the redox potential of pollutants was essential to the electron-transfer oxidation in Mn-SAC/PMS system. Based on the new insights in this work, we will be able to unveil the sources of Fenton-like systems with tunable oxidation processes.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Yanbing Li,Jiayue Ma,Rui Pan,Ting Wang
The efficient use of wood powder has become increasingly important for protecting the environment and addressing energy shortages. In this study, a proton exchange membrane electrolysis system was utilized to convert biomass into valuable industrial chemicals and hydrogen using ferric ions as redox mediators , reduced reaction costs. GC-MC analysis revealed that the degradation products are mainly consisted of aromatic carbonyl compounds , along with some alcohols, phenols , and alkanes. The degradation efficiency was found to be 55.6 %, and the Faraday’s hydrogen production efficiency exceeds 92.6 %. Moreover, Fe 3+ /Fe 2+ redox mediators was recycled in the electrolysis system, maintaining high reactivity. This research introduces a new approach for the degradation of wood powder, offering potential for sustainable industrial production and a reduction in environmental impact.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Agricultural Science & Technology
·
2025
·
IF 2.9
Huiqian Wang,Dongru Wang,Qiuping Zheng,Yuan He,Qian Yang,Jiani Du,Jiawei Wang,Xinhua Zhan
Polyvinyl chloride microplastics (PVC-MPs) pollution is drawing increasing attention, especially due to concerns about the environmental safety of the diverse additives that they contain. To date, few ecotoxicity data are available for PVC MP-derived chemicals. Here, wheat (Triticum aestivum L.) seedling roots were used to comparatively evaluate the toxicity of three commonly studied PVC MP-derived chemicals (2,4-dimethyl-6-s-hexadecylphenol─Irganox 1076 and tris (2,4-ditert-butylphenyl) phosphate─Irgafos 168-ox, and erucamide─Eru). These chemicals were evaluated individually and in combination. Exposure to these chemicals caused dose-dependent reductions in root dry weight (0.39%–19.29%) and root length (0.11%–8.15%). While Irganox 1076 and Eru had minimal impact on root activity and the antioxidant system, Irgafos 168-ox and its mixture induced significant elevations of antioxidant enzymes (SOD, CAT, and APX) activities and antioxidants (AsA and GSH) concentrations in the roots, enhancing the antioxidant level. Our findings indicate that the coexposure of PVC MP-derived chemicals exerts an additive effect on antioxidant response inhibition. Irgafos 168-ox showed stronger effects with the maximum toxic concentration of 10 mg L–1, whether alone or in additive mixtures, due to its higher potential for root accumulation and oxidative stress induction. These results highlight the need for further research into ecological risks of PVC MP-derived chemicals, particularly under combined exposure scenarios.
研究领域:
环境科学
·
植物生理学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Fei Miao,Zehao Liu,Xin Kang,Cheng Cheng,Xiaoyu Mao,Ruimeng Li,Heng Lin,Hui Zhang
Heterogeneous catalytic oxidation based on iron species for peroxymonosulfate (PMS) activation is considered as one of the most attractive strategies for wastewater treatment. However, the rate-limiting regeneration of Fe(II) from Fe(III) heavily hampers the efficient activation of PMS. In this study, the introduction of electric field to the Fe-supported bentonite (Fe-B) activated PMS process was proposed to enhance the Fe(III)/Fe(II) redox cycle. The Fe-B catalyst performed well in the removal of Acid Orange 7 (AO7) through the synergistic effect of electrolysis and the continuous redox cycle of Fe(III)/Fe(II) for PMS activation. The use of 0.5 g L −1 Fe-B catalyst and 10 mM PMS yielded nearly complete removal of the AO7 (50 mg L −1 ) in 60 min at 2 mA cm −2 of current density. Based on the results of electron paramagnetic resonance (EPR) spectroscopy, chemical quenching tests, X-ray photoelectron spectroscopy (XPS) analysis, and electrochemical measurements, the decolorization of AO7 was dominantly attributed to surface-bound radicals (SO 4 •− ads and • OH ads ) and also the direct electron transfer at DSA anode. Moreover, the electro/Fe-B/PMS system showed an effective pH range from 2.6 to 9.0 and the abatement of AO7 was slightly affected in the presence of natural background anions. This work provides a feasible strategy of PMS activation by cost-effective Fe-B catalyst coupling with electric field and gives an insight into the accelerated oxidation of recalcitrant pollutants.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Plants-Basel
·
2025
·Vol. 14
·期 9
·1354
·
IF 4.1
Guoying Yuan,Dan Wang,Chaoguang Yu,Jianfeng Hua,Yunlong Yin,Tingting Chen
DNA methylation plays a crucial role in regulating the developmental processes of plants. Particularly, it is closely associated with the development of embryogenic cells (EC) and somatic embryos (SE). In this study, we investigated the effects of 5-azaCytidine (5-azaC) treatment on somatic embryogenesis proliferation and maturation ofTaxodiumhybrid ‘zhongshanshan’. The results showed that the callus proliferation was inhibited when the concentration of 5-azaC exceeded 30 μM, while treatment with 5 μM 5-azaC improved the maturation rate and expedited the process of SE formation. It was also noted that 5-azaC influenced somatic embryogenesis during the second week of embryo induction, substantially enhancing the maturation rate of somatic embryos and the germination rate ofTaxodiumhybrid ‘zhongshanshan’. Furthermore, the analysis revealed that treatment with 5-azaC resulted in elevated levels of H2O2, SOD, POD, and AsA during the cotyledonary embryo period inTaxodiumhybrid ‘zhongshanshan’, indicating its potential to promote somatic embryogenesis by regulating redox homeostasis. This study concluded that 5-azaC could improve the efficiency of somatic embryogenesis inTaxodiumhybrid ‘zhongshanshan’, as well as provide a solid foundation for investigating the effects of 5-azaC on somatic embryogenesis in other conifer species.
研究领域:
植物学
·
遗传学
·
发育生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2025
·
IF 26
Xinyuan Li,Jianchao Jia,Yongqiang Dai,Xuanshuo Zhang,Lifeng Guan,Dehui Zhang,Fei Wang,Qianming Wang,Wei Zeng
The design of high-performance n-type ionic thermoelectric cells (i-TE cells) tailored for harvesting low-grade thermal energy presents significant challenges. In this study, an n-type i-TE cell exhibiting substantial negative thermopower and a high output energy density is developed by leveraging the synergistic interplay between thermal diffusion within an ionic hydrogel electrolyte and redox reactions at the electrode interface. Specifically, a gel network featuring dual positive groups is synthesized by cross-linking quaternized chitosan and guanidine molecules via glutaraldehyde, with thermal diffusion further enhanced by incorporating crown ether for complexation. Additionally, NiCo(CO 3 )(OH) 2 , a material known for its high hydrophilicity, is utilized as the anode to facilitate rapid ion and electron transfer at the electrode interface. The integration of optimized thermal diffusion within polycationic electrolytes with electrode interface-enhanced ion/electron transport mechanisms significantly improves the sustained output performance and thermoelectric conversion efficiency of the i-TE cell. Notably, the thermopower (Seebeck coefficient) of this n-type i-TE cell achieves a value of −26.04 mV K −1 , and its 2 h output energy density reached 1301.61 J m −2 under a temperature difference (ΔT) of 15 K. These findings offer a novel design paradigm for high-performance n-type i-TE cell.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Xiaozhou Cao,Xiwen Wang,Xiangxin Xue
Graphical A Zn−Fe redox flow battery based on choline chloride ethylene glycol deep eutectic solvent is studied. The coulombic efficiency of the cell maintains at about 100 % more than 50 cycles and shows an anomalous variation due to the effect of RO − groups. The study shows the potential of deep eutectic solvent-based flow batteries for large-scale energy storage. Deep eutectic solvents (DESs) were considered as a potential electrolyte because of their low price, harmless to environment and wider electrochemical window potential compared to water. In this work, Fe(III)/Fe(II) and Zn(II)/Zn redox couples were used as the positive and negative active materials, respectively, in a DES system using choline chloride and ethylene glycol in a molar ratio of 1 : 2 (ethaline). The possible working mechanism of the battery was studied by cyclic voltammetry, spectroscopic and simulation methods. The effects of different temperatures, concentrations of zinc ions in the anolyte and current densities on battery performance were evaluated. The results showed that the designed zinc-iron battery should preferably be operated at a current density of 0.5 mA cm −2 and the temperature of 313~323 K, which will improve the energy efficiency and maintain a high coulombic efficiency. The variation of cycle performance test presents a different pattern from the usual batteries, which is due to the effect of RO − group. At 313 K and 0.5 mA cm −2 , the coulombic efficiency increases from 14.1 % to 100.2 % after 46 cycles, and then remains at about 100 % during the rest 54 cycles, which demonstrates a good cycle stability of DES-based zinc-iron battery.
研究领域:
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
J. Zhao,W. Guo,Y. Fu
Lithium–selenium (Li–Se) batteries are promising high-energy battery systems. However, they suffer from shuttling effects of soluble lithium polyselenide intermediates and poor cycling stability. Herein, we use diphenyl diselenide (DPDSe) as an electrolyte additive to alter the redox reactions of selenium. The Li|Se-DPDSe cell shows the maximum discharge capacity of 643 mAh/g at 0.3 °C in the first few cycles, which is 94.7% of the theoretical specific capacity. After 250 cycles, it still maintains a reversible capacity of 602 mAh/g, possessing 93.6% of the initial capacity with Coulombic efficiency of almost 100%. DPDSe brings a new electrochemical reduction pathway leading to a high discharge voltage plateau. In the charge process, some selenium atoms are integrated into the structure of DPDSe to form diphenyl triselenide which adheres to carbon nanotubes therefore reducing the loss of active material. This study reveals intriguing electrochemical reactions of organoselenides and provides guidance for the optimization of electrolyte for stable Li–Se batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yifan Wang,Mengyun Zhao,Ting Wang,Mengzhu Li,Xilei Lu,Bingchi Li
Environmental application of cornstalk and production of hydrogen from biomass are two vital research topics. Herein, a low-cost easy preparing strategy was proposed for trying to give a solution. Non-noble metal of Fe ion was used as an oxidizing agent and electron stockpile carrier for degrading cornstalk and providing e − to the cathode. Using proton exchange electrolysis technique, it can realize H 2 production with a Faraday Efficiency of 94.65%. Different influence factors including temperature, electrolytic potential and electrolytic current density were studied. To the degradation products , the preliminary analyses by SEM, FT-IR, GC-MS and 2D HSQC NMR were given. The results demonstrate that Fe 3+ /Fe 2+ -cornstalk electrolytic system could give a new pathway for environmental application of cornstalk and production of hydrogen.
研究领域:
环境科学
·
生物能工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Ya Wang,Jiahai Ma
Natural dissolved organic matter (DOM) is ubiquitous in environment and plays an important role in numerous environmental processes. Although the molecular basis of the reactivity of DOM remains poorly understood due to its extreme complexity, redox-active carbonyls (aromatic ketones/aldehydes and quinones) within DOM are believed vitally important. Except the rough determination of total carbonyls (including non-redox active –COOR) based on inflexible 13 C chemical shift range by expensive and time-consuming solid-state nuclear magnetic resonance (NMR), there is no ready method to quantify redox-active carbonyls in DOM. Here we show that after treatment with sodium borohydride (NaBH 4 ) by selectively eliminating redox-active carbonyls, quenched fluorescence of carbon quantum dots (CD) by DOM recovered dramatically, and displayed a good linear relationship between redox-active carbonyls detected and DOM concentration ( R 2 ≥ 0.977 ), thus allowing first quantitative determination of the redox-active carbonyls of DOM. Eight DOM isolates present 0.59%–0.90% redox-active carbonyls by the current method. And this method is robust from coexisting proteins and salts. This method could provide better or equal instructive results compared with solid-state NMR for total carbonyls or electrochemical method for electron-accepting capacities (EAC). Our results provide the underlying structural basis of many important geochemical processes that mediated by DOM. We posit that this method could apply to other complex molecular systems such as the atmospheric aerosols and extracellular polymeric substances (EPS), too.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）