Journal of Functional Foods
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2017
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IF 3.144
Shan Hong,Shanshan Wu,He Cai,Yimin Wang,Songbai Liu
Proton NMR signals of the phenolic hydroxyl groups of the substituted catechins were successfully collected. The identities of these signals were elucidated and confirmed by a combination of computational and experimental investigations including GIAO-B3LYP NMR chemical shift calculation, kinetic analysis of acylation, and NOESY correlation. Furthermore, the reliability of chemical shifts of hydrogens of phenolic hydroxyl groups was confirmed by evaluation of the influence of acidic, basic and water residues. Finally, the chemical shift profiles of phenolic hydroxyl groups were developed for instant structural recognition. This study demonstrated the feasibility of application of chemical shifts of hydrogens of phenolic hydroxyl groups as fingerprint for structural determination and the concept could be extended to other polyphenols.
研究领域:
植物化学
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分析化学
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计算化学
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DOI
高影响因子
Materials
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2023
·Vol. 16
·期 4
·1643
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IF 3.4
Yihan Guo,Tongxiang Chen,Yongjin Zou
In this study, MXene-derived/NiCoFe-LDH heterostructures with three-dimensional interconnected porous network microstructures were prepared, leveraging the excellent electrical conductivity and growth platform provided by the MXene material. The remarkable specific capacitance of metal oxides was fully exploited. The composite exhibited high specific capacitance and excellent stability, with a specific capacitance of 1305 F g−1at 1 A g−1and a capacitance of 85.7% of the initial performance after 6000 charge/discharge tests at 10 A g−1. A two-electrode assembly was constructed using activated carbon as the negative electrode material corresponding to 49.5 Wh kg−1at 800 W kg−1, indicating that the electrodes could achieve rapid charge/discharge. The findings of this study indicate that the composite material comprising LDH/MXene has significant potential for supercapacitor applications.Keywords:supercapacitor;MXene;layered double hydroxide;three-dimensional
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
Biomed Research International
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2018
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IF 2.583
Juan Huang,Yun Yang,Yaokun Wang,Mingyang Zhang,Youxun Liu
The application of laccase-mediator-based catalysis is limited owing to the high cost of laccases and mediators and the potential toxicity of free mediators. Here, a novel biocatalyst (Im-LMS) was fabricated by immobilizing both laccase and a mediator (2,2’-azino-bis-[3-ethylbenzothiazoline]-6-sulfonic acid) on layered double hydroxide/alginate biohybrid beads. The catalytic activity of Im-LMS was evaluated for dye decolorization using malachite green. The decolorization yields of malachite green by Im-LMS and the free laccase-mediator system were 92% within 120 min and 90% within 90 min. Malachite green solution was detoxified completely after biodegradation by Im-LMS. Following eight reuse cycles of Im-LMS for dye treatment, a decolorization yield of 79% was obtained. The activity of Im-LMS was almost completely stable after being stored for 10 days. The recyclability and stability of Im-LMS will be helpful for reducing the running cost and potential toxicity associated with mediators to facilitate practical applications.
研究领域:
环境科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Liang Yu,Huanhui Chen,Gaoyang Ma,Junrong Zeng,Ya Liu,Gaowei Zhang,Liubiao Zhong,Yejun Qiu
The recycling of spent lithium-ion batteries (LIBs) has received increasing attention for environment and resource reclamation. Converting LIBs wastes into high-efficiency catalysts is a win-win strategy for realizing resource reclamation and addressing sustainable energy challenges. Herein, we developed a simple method to upcycle spent-LIBs cathode powder into Co-doped NiFe carbonate hydroxide hydrate (Co/NFCH-FF) as a low-cost and efficient oxygen evolution reaction (OER) electrocatalyst . The optimized Co/NFCH-FF electrode appears very competitive OER performances with low overpotentials of 201 and 249 mV at 10 and 100 mA cm −2 , respectively, a small Tafel slope of 48.4 mV dec −1 , and a high long-term stability. Moreover, we reveal that the existence of Co atoms leads to the formation of a crystalline/amorphous (c/a) interface at the Co/NFCH nanosheet edge, inducing the nanosheets possess a unique edge effect to enhance electric fields and accumulate hydroxide ions (OH – ) at the edge during the OER process. Benefiting from edge effect, Co/NFCH-FF shows outstanding intrinsic activity. Furthermore, Co atoms as dopants stabilize the electronic structure of Co/NFCH-FF, enabling Co/NFCH-FF to exhibit excellent catalytic stability. This work provides an effective strategy for converting the end-life LIBs to high-performance multicomponent OER electrocatalysts and proposes new insights into the mechanism of enhanced catalytic activity of Co/NFCH.
研究领域:
材料科学
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电化学
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能源与环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Shuai Sun,Lipeng Wang,Pingan Song,Liping Ding,Yongping Bai
Phosphite antioxidants are extensively used in polyester industry due to extraordinary antioxidative and chromaticity protection capabilities. Unfortunately, they are highly susceptible to hydrolysis leading to reduced antioxidative activity, which remains unsatisfactorily addressed so far. In this work, we have demonstrated the fabrication of hydrolysis resistant hybridized phosphite antioxidants (PSLDH) by physically melt-blending with layered double hydroxides (LDH) based on the hydrolysis mechanism. X-ray diffraction measurements indicate that basically phosphite antioxidants are physically hybridized with the LDH. Accelerated hydrolysis results show that as-fabricated hybridized phosphite antioxidants show much superior anti-hydrolysis capability to the unmodified counterpart because the basic LDH can neutralize the phosphoric acid created during hydrolysis, thus effectively prohibiting the self-catalytic effect. High performance optical poly(ethylene terephthalate) (PET) materials are then synthesized by in situ adding PSLDH in the polycondensation process. Only adding 0.05 wt% of the PSLDH containing 10 wt% of LDH can remarkably improve the anti-oxidative and chromaticity performances of the resultant PET. This work provides an innovative methodology for developing high-performance value-added chemical additives via facile physical hybridization.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Xiaoyue Zhou,Renli Yin,Jieqiong Kang,Zhenjie Li,Yanan Pan,Jieyun Bai,Adela Jing Li,Rongliang Qiu
The formation of high-valent active species during peroxymonosulfate (PMS) activation has attracted great interest. However, how to rapidly generate high-valent active species during PMS activation process remains ambiguous. Herein, iron vacancy anchored layered double hydroxides activated PMS process were designed to enhance the removal rate of sulfamethoxazole (SMX) by 30.0 times to PMS alone, which even showed much superiority to the homogeneous Fe 2+ /PMS system. Due to the cooperation of Fe vacancies, PMS favored to be adsorbed on Fe2 sites (adjacent to iron vacancy) and combined with Fe2 sites to form Fe(II)-O-SO 3 -OH complex. Then, the accepted electrons led to the cleavage of S-O bond in Fe(II)-O-SO 3 -OH complex, resulting in the spontaneous generation of Fe (IV) =O/Fe (V) =O species. Finally, PMS activation pathways were proposed from radical oxidation to nonradical oxidation via high-valent iron-oxo species. This study provides a new perspective on generation of high-valent iron-oxo species for excellent performance and resistance with real wastewater .
研究领域:
环境化学
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水处理
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高级氧化工艺
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2022
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IF 4.966
Ziqing Tang,Hongda Guo,Jianyu Xu,Zongjin Li,Guoxing Sun
Treatment of wastewater which containing organic dyes has attracted great attention in the last decades since organic dyes were produced in an increasing quantity. Hydrogel adsorbent, as a promising candidate for organic dye removal from aqueous solution, has been studied by many researchers in recent years. However, it's still a challenge to create hydrogel adsorbent with high adsorption capacity and short contact time concurrently. Herein, we present a polyelectrolyte hydrogel adsorbent for anionic dyes removal which constructed by cationic monomer diallyldimethylammonium chloride (DADMAC) and acrylamide (AAm). Using calcium hydroxide nano-spherulites (CNS) as crosslinker, this physical hydrogel adsorbent showed a loosely crosslinked network structure. In optimal condition, the obtained P(AAm-DADMAC)/CNS hydrogel adsorbent showed a maximum adsorption capacity of 409 mg/g for methyl orange with a short contact time of 135 min. In addition, the adsorption process of this hydrogel adsorbent was well described by pseudo-first-order kinetic model and Langmuir adsorption isotherm model. Moreover, our P(AAm-DADMAC)/CNS hydrogel adsorbent also exhibited high adsorption capacities for other anionic dye, including Congo red (862 mg/g), Eriochrome black T (1139 mg/g) and methyl blue (722 mg/g). These results indicated that the P(AAm-DADMAC)/CNS hydrogel was a promising adsorbent material in wastewater treatment application.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Yajie Luan,Huaqi Wang,Changfeng Han,Xiuying Zhao,Youping Wu
The aging degradation process is significantly accelerated in unsaturated natural rubbers (NR) due to their susceptibility to α-H bond dissociation caused by exposure to heat and oxygen. Recently, the European Union has listed widely used antioxidant N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine (6PPD) as the restricted category of compounds, sparking a growing desire to find environmentally friendly alternatives. Through a combination of molecular simulation and experimental methods, this study aims to investigate the protection mechanism and conformational relationship of the natural antioxidant gallic acid (GA) and its ester derivatives within the NR matrix. The ultimate objective is to identify natural antioxidants that possess the capability to effectively substitute 6PPD. Simulation results of the chemical aging factor suggest that the phenolic hydroxyl hydrogen dissociation energy of GA is lower than that of the α-H bond of NR, thereby delaying the aging process. Based on the influence of physical aging factors, the polarity of GA derivatives decreases as the modified alkyl chain lengthens, improving the compatibility and migration resistance with NR, strengthening interaction force, and lowering oxygen permeability. Additionally, comprehensive simulation results indicate that octyl gallate derivatives exhibit notable antioxidant properties. Subsequent DPPH radical scavenging experiments, microstructural characterizations, and macroscopic mechanical property tests have confirmed the optimal antiaging properties of octyl gallate in NR, which these ester derivatives are expected to be a nontoxic, nonhazardous, and safe natural antioxidant alternative to 6PPD.
研究领域:
材料科学
·
高分子化学
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环境科学
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化工工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）