JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
·
IF 5.279
Di Fan,Xinyi Xie,Canxin Li,Xingwang Liu,Jian Zhong,Xinping Ouyang,Qiyu Liu,Xueqing Qiu
The traditional pretreatment leads to the recalcitration of C–C bonds during lignin fractionation, thus hindering their depolymerization into aromatic monomers. It is essential to develop an applicable approach to extract noncondensed lignin for its high-value applications. In this work, noncondensed lignins were extracted from poplar sawdust using recyclable p-toluenesulfonic acid for cleaving lignin–carbohydrate complex bonds effectively and ethanol as a stabilization reagent to inhibit lignin condensation. Lignin yield of 83.74% was recovered by 3 mol/L acid in ethanol at 85 °C for 5 h, and carbohydrates were well preserved (retaining 98.97% cellulose and 50.01% hemicelluloses). During lignin fractionation, the acid concentration and extraction time were the major drivers of condensation. Ethanol reacted with lignin at the α-position to prevent the formation of the condensed structure. The extracted lignin depolymerized over the Pd/C catalysts gave a yield of 50.35% of aromatic monomers, suggesting that the novel extraction process provided a promising way for noncondensed lignin production.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yiwei Li,Yaohong Ma,Eric Lichtfouse,Jin Song,Rui Gong,Jinheng Zhang,Shuo Wang,Leilei Xiao
Para-Nitrophenol ( p -nitrophenol) is a common industrial pollutant occurring widely in water bodies, yet actual monitoring methods are limited. Herein we proposed a fully electrochemically in situ synthesized graphene-polyarginine composite functionalized screen printed electrode, as a novel p-nitrophenol sensing platform. The electrode was characterized by morphologic, spectrometric and electrochemical techniques. p -nitrophenol in both pure aqueous solution and real water samples was tested. Results show a detection limit as low as the nanomolar level, and display a linear response and high selectivity in the range of 0.5–1250 μM. Molecular simulation reveals a detailed synergy between graphene and poly-arginine. The preferable orientation of nitrophenol molecules on the graphene interface in the presence of poly-arginine induces H- and ionic binding. This sensor is an ideal prototype for p -nitrophenol quantification in real waters.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Xiaoxia Ye,Huiting Lin,Ruiyang Chi,Zhixuan Guo,Yuancai Lv,Chunxiang Lin,Yifan Liu,Wei Luo
Efficient and rapid removal of p -arsanilic acid ( p -ASA) in water is very important in environmental protection and human health, however it is still a severe challenge in actual engineering. Herein, a novel sorbent (CF-PEI) was successfully fabricated by simply modifying the amphiphilic skin collagen fiber (CF) substrate with Polyethylenimine (PEI). The as-prepared CF-PEI exhibits high-efficiency adsorption for negatively charged p -ASA with aromatic rings due to the introduction of amino groups and the existence of hydrophobic bands, and the maximum adsorption capacity of CF-PEI for p -ASA was high up to 285.71 mg g −1 . In addition, the adsorption mechanism of CF-PEI on p -ASA mainly includes electrostatic interaction, hydrogen bond and amphiphilicity. The multi-level all-fiber structure of CF makes it mainly focus on surface mass transfer with short mass transfer distance, and its capillary drainage effect can realize large flow and rapid separation. CF-PEI based on CF can realize the ability to separate low-concentration p -ASA with high flow rate and high efficiency. The effective processing volume was 12.5 L g −1 when the separation flux reached as high as 9931.27 L m −2 h −1 . Notably, the p -ASA adsorbed on CF-PEI was almost completely eluted by NaOH (0.5 mol L −1 ). The adsorbent is convenient to prepare, recyclable, high in efficiency, and has a great application prospect in removing organic micro-pollutants.
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高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Juan Li,Xu Zhao,Li-Jian Chen,Hai-Long Qian,Wen-Long Wang,Cheng Yang,Xiu-Ping Yan
Aflatoxin B1 (AFB1) contamination is one of the most critical global issues in food safety. The high carcinogenic nature necessitates rapid and specific methods for the determination of AFB1 in foodstuffs at ultratrace levels. Here, we report an enhanced bienzymatic chemiluminescence competitive immunoassay for ultrasensitive and high-throughput determination of AFB1. In this assay, protein G was first coated on the wells of a microplate for recognizing the Fc fragment of anti-AFB1 mAbs to reduce the antibody dosage and guarantee high immunological reaction efficiency. The target AFB1 competed with glucose oxidase labeled AFB1 for the limited anti-AFB1 mAbs in the wells of the microplate. p-Bromophenol was employed as an enhancer to obtain intense and long-lasting chemiluminescence. The utilization of an enhancer and bienzymatic catalysts effectively improved the detection sensitivity. The developed method offered a good linearity over 5 orders of magnitude, a detection limit of 5 pg L–1, and a relative standard deviation of 1.9% for AFB1. The application of the developed method to the analysis of grain samples gave quantitative recoveries from 94.0% to 97.0%. The developed method provides a universal platform for high-throughput, ultrasensitive, and high specific detection of pollutants or nutrients in foods.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Lingling Ding,Haijun Tao,Chuanxiang Zhang,Jiwei Li,Wenjun Zhang,Jiayue Wang,Jianjun Xue
The hole transport layer (HTL) free carbon based perovskite solar cells (Carbon PSC) are known for low cost, good stability and commercial manufacturing technology . Compared to the structure of traditional cells, the carrier transport performance between the absorber layer and the carbon electrode (CE) is poor. As an excellent P-type material, NiO has been doped in CE for obtaining a better performance of PSCs. However, NiO will inevitably reduce the conductivity of the CE due to the poor conductivity, thus failing to fully exploit the advantages of NiO in hole extraction. In this paper, rGO/NiO composites were successfully prepared by doping rGO with good conductivity, which not only improved the conductivity of the CE, but also ensured good hole extraction of the doped CE. The carrier transport in the cell was significantly improved, resulting in 32% increase in the short circuit current density (J sc ). The performance of perovskite solar cells was optimized by doping the CE, and the power conversion efficiency (PCE) of the cell was increased from 5.48% to 8.50%.
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COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Yunhua Yang,Liang Xiong,Xiaomo Huang,Qingshan Shi,Wei-De Zhang
In this work, we used p-hydroxybenzoic anionic intercalated MgAl-layered double hydroxides (MgAl-(p-BzOH)-LDH) as a filler to modify waterborne polyurethane , and successfully synthesized novel WPU/MgAl-(p-BzOH)-LDH composites. CO 3 2- -type MgAl-LDH was firstly synthesized via hexamethylenetetramine hydrolysis method and then was transferred to p-BzOH-intercalated MgAl-LDH by ion exchange. The nanostructured MgAl-(p-BzOH)-LDH was then grafted by isophorone diisocyanate (IPDI), forming [MgAl-(p-BzOH)-LDH] NCO complex with NCO group on the surface, which promotes its homogeneous dispersion in WPU matrix through chemical bonding. The mechanical properties and water resistance of the composites were improved upon loading the MgAl-(p-BzOH)-LDH in certain levels. Furthermore, the composites can slowly release p-hydroxybenzoic anionic into the surrounding environment, and thus exhibit significant antibacterial activity towards G( _ ) Escherichia coli and G(+) Staphylococcus aureus.
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CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Mingyue Liu,Renliang Huang,Chuanxi Li,Mingda Che,Rongxin Su,Shuzhou Li,Jing Yu,Wei Qi,Zhimin He
Nanoscale zero-valent iron has been widely applied in environmental remediation and toxic waste treatment, especially for the degradation of persistent organic pollutants (POPs). However, the dechlorination activity of Fe nanoparticles (Fe NPs) can be suppressed by the precipitation of iron oxides generated from the corrosion of Fe-Pd NPs under alkaline conditions, leading to a decreased dechlorination efficiency. Faced with this challenge, we report a highly effective dechlorination system that functions over a broad pH range and especially well under alkaline conditions in this work. Procyanidin (PROC), a natural polyphenol, was utilized as a stabilizer to manipulate the size distribution of Fe-Pd NPs and, more importantly, as a scavenger of Fe ions to prevent iron oxide precipitation. Experiments and theoretical calculations reveal that the generated Fe ions was mainly present in the form of bis- and tris-PROC-Fe complexes in the reaction solution. Compared with pristine Fe-Pd NPs, the PROC-modified Fe-Pd NPs had a dechlorination efficiency that was increased 20-fold (pH 9.0). Notably, a normalized rate constant was enhanced by more than 2 orders of magnitude compared to the previously reported dechlorination systems. The PROC-modified Fe-Pd NPs showed excellent dechlorination efficiency over a wide pH range (2.3–13.0).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Zhou,Zixin Jia,Lingling Shi,Zhen Wu,Binyong Jie,Siyuan Zhao,Liyuan Wei,Aiguo Zhou,Junwu Zhu,Xin Wang,Yongsheng Fu
Young-Laplace equation and Kelvin equation, as two important and foundational laws in interface physico-chemistry, can reasonably interpret many complicated physico-chemical phenomena at interfaces and have been widely applied to many practical problems arisen from the production and humankind activities. In this work, by means of the large pressure difference generated on a curved surface of nano-sized liquid under the action of surface tension, the transformations from the hollow carbon nanospheres to the carbon nanobowls and the phosphorus-doped carbon nanobowls have been successfully achieved. Compared with the hollow carbon nanospheres, the carbon nanobowls and phosphorus-doped carbon nanobowls possess high packing densities, which are beneficial to form a favorable conductive pathway, leading to enhanced electrochemical performance. In particular, the phosphorus-doped carbon nanobowls, as electrode material for supercapacitors, show a high specific capacitance of 246.22 F cm −3 (273.58 F g −1 ) and can maintain the capacitance at a high current density of 10 A g −1 without noticeable decay over 40,000 cycles. More importantly, the symmetric supercapacitor based on the phosphorus-doped carbon nanobowls exhibits high energy density and power density as well as excellent cycling stability. This work widens the application of Young-Laplace equation in bowl-like materials and offers new insights into the formation mechanism.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
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IF 13.325
Hu Yuanxia,Ma Jinghong,Gong Jinghua
The hydrophobic random copolymer P(HEMA-MMA-SMA) which contained 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and stearyl methacrylate (SMA) chains was successfully synthesized via radical polymerization. The composites membranes of poly (vinylidene fluoride) (PVDF) and P(HEMA-MMA-SMA) blends and PVDF/P(HEMA-MMA-SMA)/SiO 2 were prepared by electrospinning. Scanning Electron Microscopy (SEM) and Water Contact Angle (WCA) revealed that morphology and hydrophobic properties of the membrane surface. With the condition of 12 wt% SiO 2 , the maximum WCA (154°) of the electrospun composite film can be obtained. Superhydrophobic materials have been widely used in the fields, such as oil-water separation and self-cleaning. Keywords Methacrylate Poly(vinylidene fluoride) SiO 2 Random copolymer Blends Superhydrophobic Electrospinning Membranes
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ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2018
·Vol. 233
·期 2
·303-313
·
IF 1.144
Bingbing Hou,Peng Peng,Ping Zhang,Cuiping Zhai
UV-Vis absorption spectra, cyclic voltammetry and 1 H nuclear magnetic resonance ( 1 H NMR) spectra were applied to explore the hydrogen bond interactions of p-aminophenol hydrochloride (PAH) with H 2 O. The results indicated the hydrogen bonds were formed in PAH–H 2 O system. The anodic/cathodic peak potentials and UV-Vis absorption bands of PAH in H 2 O could be affected due to the interactions. The results of density functional theory, atoms in molecules theory and natural bond orbital analyses further confirmed the existence of hydrogen bonds between the phenolic hydroxyl, –NH 3 + protons and Cl − of PAH and H 2 O. Furthermore, the π-π stacking was suggested between PAH benzene rings from the 1 H NMR spectra at higher concentrations.
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高影响因子
Journal of Physical Chemistry C
·
2013
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IF 4.814
Zhiqiao He,Yuanqiao Shi,Chao Gao,Lina Wen,Jianmeng Chen,Shuang Song
A novel visible-light-active BiOCl/BiVO4 photocatalyst with a p–n heterojunction structure was prepared using a hydrothermal method. The photocatalytic activity of the heterojunction was investigated by monitoring the change in methyl orange (MO) concentration under visible-light irradiation. The results reveal that the composite exhibited markedly improved efficiency for MO photodegradation in comparison with pure BiVO4, BiOCl, and Degussa P25. This is ascribed to the B-type heterojunction structure with a strong oxidative ability and efficient charge separation and transfer across the BiOCl/BiVO4 p–n junction. The highest activity was obtained in the BiOCl/BiVO4 heterojunction using a composite of 13 mol % BiOCl and 87 mol % BiVO4. The removal of MO was mainly initiated by valence-band holes, but dissolved oxygen also played a crucial role in consuming the conduction-band electrons. This was verified by the effects of scavengers and N2 purging.
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RSC Advances
·
2015
·Vol. 5
·期 25
·19020-19026
·
IF 3.84
Feng-Xia Liang,Deng-Yue Zhang,Yi-feng Zou,Han Hu,Teng-Fei Zhang,Yu-Cheng Wu,Lin-Bao Luo
In this study, we present a simple oxide assisted p-type doping of Si nanostructures by evaporating a mixed powder composed of SiB6 and SiO. It was found that Si nanoribbons (Si NRs) which can be obtained at high SiB6 content, will give way to Si nanowires (Si NWs) when the content of SiB6 in the mixed powder was reduced. According to our transport measurement of field effect transistors (FETs) assembled on individual Si nanostructures, the as-prepared Si nanostructures with different boron doping levels all exhibit typical p-type conduction characteristics. Additionally, the electrical conductivity of the Si nanostructures can be tuned over 7 orders of magnitude from 8.98 × 102 S cm−1 for the highly doped sample to 3.36 × 10−5 S cm−1 for the lightly doped sample. We also assembled a nano-photodetector based on monolayer graphene and the as-prepared Si nanostructures, which exhibits ultra-sensitivity to 850 nm near infrared light (NIR) illumination with a nanosecond response speed (τrise/τfall: 181/233 ns). The generality of the above results suggest that the Si nanostructures are promising building blocks for future electronic and optoelectronic device applications.
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危险品化学品经营许可证（带存储）