CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Ying Qiao,Chengkai Zhai,Fei Liu,Lai Chen,Haining Na,Jing Chen,Jin Zhu
Following the main idea of a two-step method, microcrystalline cellulose is firstly pretreated to prepare regenerated cellulose (RC) with low crystallinity. Then, RC is continuously hydrolyzed to sugar in aqueous system by microwave driving. With the establishment of ZrO 2 contained low acid catalytic system, an advanced route driven by microwave radiation to induce highly efficient hydrolysis of RC to sugar is formed. Due to the effect of ZrO 2 on the molecular chain of cellulose, the recrystallization of RC is obviously weakened, and higher hydrolysis reactivity is achieved. Under the optimal conditions, the average conversion of RC and the yield of total reducing sugar highly reach 98.4 ± 0.5% and 97.9 ± 0.6%, respectively. The result is extremely superior to the efficiency of hydrolysis initiated only by pure acid. As a result, a novel and simple thinking to establish an advanced two-step methodology to hydrolyze cellulose to sugar with high efficiency is achieved.
研究领域:
生物化学
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可再生能源
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 25
·15082-15089
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IF 10.7
Zongmiao Li,Zhu Liu,Shiju Li,Yuhou Pei,Di Li,Jiale Mao,Rong Zhou,Chuntian Qiu,Yingying Lu,Bing Zhang
Electrochemical conversion of carbon dioxide (CO2RR) into high-value multi-carbon (C2+) chemicals and fuels is of great significance for carbon neutrality, and so far Cu-based materials are still the dominant electrocatalysts with practical application potential for C2+ products during the CO2RR. However, Cu-based catalysts usually face problems such as an unstable valence state and lattice structure, low efficiency, and a narrow potential window for C2+ products which affect the comprehensive performance of the catalysts. Herein, we develop a simple co-precipitation-hydrothermal method for introducing zirconium dioxide (ZrO2) into copper oxide (CuO) to improve the selectivity of C2+ products via in situ reconstruction. The optimized CuO–ZrO2-1.0 catalyst exhibits a high faradaic efficiency of 82.3% for C2+ products with an industrial partial current density over 200 mA cm−2, which presents a more than 1.7-fold improvement compared to that of CuO, also exceeding that of lots of Cu-based catalysts previously reported. DFT and in situ characterization studies reveal that the introduction of ZrO2 can induce the electronic distribution and stabilize the Cu+ species during the in situ reconstruction process which contributes to moderate adsorption and enhanced coupling of *CO intermediates to obtain C2+ products.
研究领域:
材料科学
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电化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-10
·
IF 5.833
Hou Xiudan,Wu Wei,Zhao Fangyuan,Xie Wancui,Yang Qingli
A simple, fast and sensitive method for the detection of luteolin is proposed based on the chitosan/reduced graphene oxide aerogel with dispersed ZrO 2 nanoparticles modified glassy carbon electrode (ZrO 2 /CS/rGOA-GCE) as an electrochemical sensor. The ZrO 2 /CS/rGOA composite was prepared by one pot synthesis from a mixture of GO, CS and zirconyl chloride octahydrate, and subsequently be freeze-dried. Scanning electron microscope images showed a typical thin, wrinkled and fluctuant morphology of graphene nanosheets and the polymerized CS and ZrO 2 nanoparticles deposited on the surface of rGOA. Cyclic voltammetry and differential pulse voltammetry were used to measure the electrochemical response of ZrO 2 /CS/rGOA composite-based biosensor towards luteolin at the working potential window (−0.8–0.8 V). The improved performance of this biosensor was attributed to efficient electron transfer and large surface area of 3D rGOA, and high specific activity of Zr towards adjacent hydroxyl groups. Under optimized conditions, the analytical performance of this method towards luteolin was investigated with a detection limit of 1 nM and a linear range from 5 nM to 1000 nM.. Finally, the ZrO 2 /CS/rGOA-GCE electrochemical method coupled with solid phase extraction was used for the detection of luteolin in real samples. Recoveries of spiked samples with different concentrations were in the range 78.6–103.3% with a relative RSD lower than 12.0%.
Schematic representation of the preparation of the ZrO 2 nanoparticles and chitosan doped graphene aerogel modified electrode. The electrode was employed for the detection of luteolin coupled with the solid-phase extraction technique.
研究领域:
分析化学
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材料科学
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植物化学
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DOI
PubMed
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2020
·Vol. 34
·期 20
·e8881
·
IF 2.2
Baichun Wang,Huanming Wu,Yinghua Yan,Keqi Tang,Chuan-Fan Ding
Rationale Due to the dynamic nature of phosphorylation states and the low stoichiometry of phosphopeptides, it is still a challenge to efficiently capture phosphopeptides from complex biological samples before mass spectrometry analysis. Among the enrichment strategies, metal oxide affinity chromatography (MOAC) is one of the most widely used and the one with the most potential. It is based on reversible Lewis acid–base interactions between the metal oxides and the negatively charged phosphate groups to achieve the specific selection of phosphopeptides. Methods A novel MOAC affinity probe, denoted as G@PDA@ZrO 2 , was successfully synthesized by in situ grafting ZrO 2 onto the surface of graphene (G) modified with polydopamine (PDA). The novel MOAC probe thus obtained was used for phosphopeptide enrichment. Results This novel MOAC affinity probe when used to selectively enrich phosphopeptides from standard protein digest solutions exhibited a high selectivity (β-casein:bovine serum albumin = 1:1000), a low detection limit (4 fmol), and a high loading capacity (400 mg/g). At the same time, the experimental results proved that G@PDA@ZrO 2 had great recyclability (five cycles), stability, and reproducibility. Subsequently, G@PDA@ZrO 2 was applied to enrich phosphopeptides from human saliva and human serum, in which 25 and 4 phosphopeptide peaks, respectively, were detected. Conclusions This novel MOAC affinity probe (G@PDA@ZrO 2 ) showed good performance in enriching phosphopeptides. Thus, G@PDA@ZrO 2 has good potential in phosphopeptidomics analysis.
研究领域:
生物化学
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蛋白质组学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jiahuan An,Guohan Sun,Haian Xia
An efficient method for the catalytic aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) was developed using size-controlled Ag nanoparticles (NPs) in an aqueous solution. A series of AgNPs catalysts stabilized by poly(vinylpyrrolidone) (PVP) supported on ZrO2with different Ag loadings were prepared. XRD, TEM, XPS, and FT-IR techniques were used to characterize the nature of these catalysts. The impact of the Ag loading, the molar ratio of PVP to Ag, the reaction temperature and time, and the base type on the conversion of HMF and yield of HMFCA was investigated. The reaction results show that Ag–PVP/ZrO2 catalysts with a bigger particle size (>10 nm) exhibited superior catalytic activity and HMFCA selectivity compared to Ag/ZrO2 with a smaller particle size (ca. 8.5 nm), indicating that the addition of PVP has a promoting effect on the aerobic oxidation of HMF into HMFCA. The 2.5%Ag–PVP/ZrO2(1:1) catalyst presents an excellent activity with 100% conversion of HMF and 98.2% yield of HMFCA in oxygen flow at 20 °C for 2 h.The basicity is also very critical to obtain a high HMFCA yield, especially for the use of high concentration of HMF; i.e., Ca(OH)2 afforded a higher selectivity toward HMFCA compared to the use of NaOH or Na2CO3 under an identical reaction condition. It is revealed for the first time that the presence of a capping agent (PVP) can effectively modulate the metal–support interaction. Interestingly, it is found that the relatively weak interaction between Ag NPs and the ZrO2 support has a beneficial effect on the conversion of HMF. This work provides new insights into the relationship between the metal–support interaction mediated by PVP molecule and the activity and selectivity of the oxidation reaction.
研究领域:
催化化学
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材料科学
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绿色化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10850-10856
·
IF 3.591
Xiaoyan Chen,Lin Song,Guanyang Zhu,Jing Ma,Ajing Xu,Wenya Zhao,Yingying Gu,Yarui An,Yuqing Miao
In this work, a unique zirconium dioxide solid superacid (ZrO2/SO42−) was utilized for the fabrication of an IgG electrochemical immunosensor. The treated ZrO2 formed a SO bond on the surface, which has the electron-attracting induction effect and can further enhance the quantity and stability of immobilized biomolecules. In addition, using a platinum nanoparticle–chitosan–reduced graphene oxide (PtNP–CHIT–rGO) nanocomposite as a substrate modification material not only improves the conductivity of the electrode, but also increases the effective surface area of the immunosensing platform. The proposed label-free immunosensor has a lower detection limit of 11.0 pg mL−1 and a wide linear range of 0.01–10.0 ng mL−1 and 10.0–4000.0 ng mL−1. Importantly, the immunosensor exhibits good selectivity, excellent stability and reproducibility, and is expected to be applied to the detection of other biomolecules.
研究领域:
生物化学
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分析化学
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材料科学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·
IF 4.3
Liu Qing-Qing,Lin Qiu-Hao,Qi Xiao-Dong,Zhang Nan,Huang Ting,Yang Jing-Hui,Wang Yong
Polymer dielectrics with a high energy density and an available energy storage capacity have been playing an important role in advanced electronics and power systems. Nevertheless, the use of polymer dielectrics in harsh environments is limited by their low energy density at high temperatures. Herein, zirconium dioxide (ZrO 2 ) nanoparticles were decorated with amino group utilizing 4,4-methylenebis (phenyl isocyanate) (AMEO) and successfully incorporated into polyetherimide (PEI) matrix. The dielectric properties, breakdown strength, and energy storage performances of PEI/ZrO 2 -AMEO nanocomposites were investigated from 25 °C to 150 °C. It is found that the combination of moderate bandgap ZrO 2 with modest dielectric constant and polar groups at interface with deep trap can offer an available strategy to simultaneously increase the dielectric constant and breakdown strength of polymer dielectrics. As a result, the composites containing ZrO 2 -AMEO exhibit excellent energy storage performance at elevated temperatures. Specially, the PEI-based composites with 3 vol% ZrO 2 -AMEO display a maximum discharged energy density ( U d ) of 3.1 J/cm 3 at 150 °C, presenting 90% higher than that of neat PEI. This study may help to better develop the polymer-based dielectric composite applied at elevated temperatures.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
ANALYST
·
2023
·Vol. 148
·期 20
·5210-5220
·
IF 4.2
Huiyang Xu,Chuang Guo,Weijian Yuan,Wenna Zhang,Qiu Sun,Jianfeng Wu,Xuelin Zhang
In this study, a simple and portable electrochemical sensor based on laser-induced graphene (LIG) has been developed to systematically investigate the feasibility of LIG as an electrode to detect organophosphorus pesticides (OPs). It proves that the LIG-based electrode has a relatively high electrochemically active surface area (ECSA) and heterogeneous electron transfer (HET) of 0.100 cm2 and 0.000825 cm s−1, respectively. In addition, zirconium dioxide nanoparticles (ZrO2 NPs) have been modified on the electrode with three different binders, β-cyclodextrin (β-CD), chitosan (CS) and Nafion, to improve the adsorption capacity of the electrode toward OPs, and the effect of the binders on the performance of the as-fabricated sensor has been investigated in detail. The results show that β-CD increases not only the electrochemically active surface area of the electrode but also the redox peak current of methyl parathion (MP). To evaluate the sensitivity of the sensor, differential pulse voltammetry (DPV) curves have been tested in solutions containing different concentrations of MP using ZrO2-β-CD/LIG as an electrode, which shows a detection range of 5–200 ng ml−1 and a detection limit of 0.89 ng ml−1. In summary, the LIG-based sensor has a low detection limit, high sensitivity and good interference resistance, and thus has tremendous potential for the detection of pesticides in the environment.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Menghuan Zhang,Yuanyuan Lu,Qingwen Lan,Yunying Fang,Tingting Ma,Shuang He,Boyi Liu,Xinqiang Liang
Rapidly monitoring dissolved inorganic phosphate is important for risk prediction and early warning of eutrophication. In this work, a reagentless electrochemical paper-based analytical device (ePAD) was developed to construct an environmentally friendly electrochemical platform for sensitively quantifying trace-level inorganic phosphate in freshwater. By modifying a type of self-synthesized nanocomposite material (zirconium dioxide/zinc oxide/multiwalled carbon nanotubes, ZrO2–ZnO/MWCNTs), more abundant electroactive sites on the paper-based electrode surface were provided for the efficient adsorption of inorganic phosphate. The voltammetric signal response for aqueous phosphate anions was notably enhanced relative to that obtained at bare ePADs by relying on reductive cyclic voltammetry with molybdate(VI). After optimizing the main experimental parameters, a lower detection limit of 0.7 μM with good linear correlation in the range of 1.43–50 μM was realized at ZrO2–ZnO/MWCNTs/ePAD. Fast analysis time and good recovery percentages (105.64, 88.27, and 112.99%) were achieved in detecting inorganic phosphate from authentic freshwater samples (tap, runoff, and lake water). Owing to the ideal reproducibility and long storage stability of ZrO2–ZnO/MWCNTs/ePAD, this user-friendly and low-cost device is promising to be an in situ portable sensor to detect inorganic phosphate in aquatic ecosystems.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Tingting Liao,Fan Luo,Xianghui Liang,Shuangfeng Wang,Xuenong Gao,Zhengguo Zhang,Yutang Fang
As energy shortage intensifies, improving energy efficiency and reducing energy consumption have become essential topics. Herein, a form-stable composite phase change material (FCPCM) consisting of modified expanded graphite (MEG) and eutectic hydrate was designed as a reliable and efficient thermal energy storage medium. Firstly, novel binary eutectic hydrate involving oxalic acid dihydrate (H 2 C 2 O 4 .2H 2 O) and ammonium aluminum sulfate dodecahydrate (NH 4 Al(SO 4 ) 2 .12H 2 O) served as an excellent thermal energy storage guest. Zirconium dioxide (ZrO 2 ) was used as a hydrophilic modifier because of its high heat resistance, high inertness, corrosion resistance , non-toxicity and countless hydrophilic groups . Therefore, the hydrophilic modified expanded graphite (MEG) as a supporting host was constructed by dip-coating of nano ZrO 2 sol on the surface of expanded graphite (EG), which improved its hydrophilicity and compatibility with a eutectic guest. Compared with the original EG (83.05°), the contact angle of MEG containing 10 % ZrO 2 on the water was decreased to 37.95°. In addition, the adsorption rate and capacity of MEG to binary eutectic were much faster and larger, reaching an approximate saturation (65.58 %) within 40 min, which was three times that of the untreated EG (23.10 %) in the same adsorption time. The resultant FCPCM containing 24 wt% MEG exhibited a good phase transition temperature (54.10 °C), high phase transition enthalpy (168.5 J/g), as well as excellent anti-leakage behavior. After 100 hot and cold cycles, the thermal performances of FCPCM kept relatively stable, which guaranteed its sustained thermal benefits. It provides a potential application in the field of solar phase change heat exchangers .
研究领域:
材料科学
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能源工程
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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）