MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Zeming Huang,Yin Gao,Zhengyu Huang,Donglin Chen,Jiahui Sun,Li Zhou
Exploring an effective sensor to detect Fe 3+ and phytic acid (PA) is of great importance because the levels of Fe 3+ and PA have a vital impact on human health. Herein, we report a metal-free fluorescent nanoprobe for sensitive and selective sensing of Fe 3+ and PA based on the sulfur quantum dots (SQDs). The SQDs with high fluorescence quantum yield (17.6%) and low cytotoxicity can be directly synthesized from cheap elemental sulfur by one-pot reaction. The SQDs display responsive and selective fluorescence “on–off-on” behavior towards Fe 3+ and PA based on the introduction and elimination of electron transfer effect. The addition of Fe 3+ can cause non-radiative electron transfer associated with fluorescence quenching of SQDs, while the addition of PA enables SQDs/Fe 3+ complex release Fe 3+ to recover the fluorescence of SQD S . By utilizing these SQDs as a fluorescent nanoprobe, it shows good linear relationship for Fe 3+ and PA in the range of 0.05–120 µM and 0–12 µM, respectively. Moreover, its limit of detection (LOD) for Fe 3+ and PA can reach as low as 102 and 73.5 nM, respectively, which compares favorably to many reported fluorescent probes. Additionally, the use of this SQDs-based sensor to detect PA in fresh carrot and lettuce samples was examined with satisfactory performance.
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高影响因子
Science China-Technological Sciences
·
2021
·Vol. 64
·期 10
·2292-2299
·
IF 3.572
Miao Xiao,Liu Shuai,Wang Min,Ge Bo,Zhu ChangQing
It is an ideal way to produce clean water after sewage treatment, during which two problems need to be solved: (1) how to deal with water soluble pollutants and surface oil slick; (2) photothermal devices should float on water. This paper presents a multifunctional water treatment device that can produce clean water vapor under light after sewage treatment. The bismuth oxybromide catalyst degrades water-soluble pollutants under light irradiation. Superhydrophobic (SH) melamine sponge has two functions: selectively adsorb surface oil slick and ensure that photothermal devices float. The hydrophilic layer provides water for local heating of the photothermal layer to produce water vapor. The SH sponge remains stable and is easy to operate during wastewater treatment, and the efficiency of water vapor production through the photothermal device is increased by 7.2 times compared with that of pure water.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Binbin Zhang,Qi Zhou,Xinwei Zhang,Jiao Ma,Xin Cong,Qin Wang,Yonggui Liao,Yajiang Yang,Hong Wang
In this work, 5,5′,5′′-(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)triisophthalate (H 6 L) was used as a gelator to prepare thermostable supramolecular gels (H 6 L gels). The lowest critical gelation concentration of H 6 L was found to be only 0.14 wt%. H 6 L gels remained stable after being placed at 85 °C for 1 h, indicating that its gel-sol phase transition temperature ( T gel ) was not<85 °C. H 6 L gels can be formed in just a few seconds in comparison with the longer gelation time of a conventional thermostable gel. Moreover, a thermostable H 6 L/Fe 3+ gel was also prepared by the coordination interactions of H 6 L and Fe 3+ ions. The studies of FT-IR, UV–vis, XRD and SEM reveal that multiple hydrogen bonds, π-π interactions as well as coordination interactions were the main driving forces for the formation of thermostable three-dimensional network structure of H 6 L gels. In addition, the fluorescence spectra of H 6 L gels showed that the dual emission at 396 nm and 469 nm was derived from the structure of melamine and 5-aminoisophthalic acid contained in H 6 L structure. The gel formed at high temperature had relatively high transparency and strong fluorescence signal, and the fluorescence intensity is affected by the external H + concentration. Using this characteristic, 14 organic acids can be effectively identified with the help of principal component analysis (PCA). L-cysteine can be identified with the naked eye by the color and state changes of H 6 L/Fe 3+ gels.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Weisheng Yang,Yifei Qu,Bingjie Zhou,Chang Li,Liang Jiao,Hongqi Dai
Lignin-derived aromatic oligomers (LDAOs) are the primary components of lignin depolymerization products. They are typically utilized as renewable crosslinking agents or resin materials with a considerably lower application value than aromatic monomers. Notably, LDAOs are rich in quinone groups, which enable storage and release of charges. In this work, the feasibility of LDAOs as renewable charge storage materials was investigated. LDAOs were first reacted with formaldehyde to generate a synthetic polymer (SP-AOF) via a phenol-formaldehyde condensation reaction. SP-AOF was subsequently incorporated with reduced graphene oxide (rGO), namely rGO/SP-AOF. As expected, the hybrid electrode exhibited high specific capacitance (250 F/g), which was approximately three times higher than that of rGO (87 F/g). This was due to the presence of quinone groups in SP-AOF, which could contribute to the overall capacitance with pseudocapacitance. Moreover, the hybrid electrode was able to deliver a high specific capacitance of 210 F/g even at a high specific current of 10 A/g. 1 H− 13 C heteronuclear single quantum coherence nuclear magnetic resonance (2D HSQC NMR) and phosphorus nuclear magnetic resonance spectroscopy ( 31 P NMR) analyses revealed that SP-AOF displayed higher quinone content (3.76 mmol/g) than commercially available lignin (organosolv and alkali lignin), which resulted in higher energy storage performance. This study provides a promising strategy for the utilization of aromatic oligomers as raw materials to manufacture high-performance lignin-derived energy storage materials.
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MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Xiaoli Luo,Limin Chen,Jianying Yang,Shuting Li,Manting Li,Qian Mo,Yinbao Li,Xinchun Li
Methods that can directly and sensitively quantify a set of correlative substances lack of chromophores in pharmaceuticals are persistently desired. Here, by facile preparation of Pt-Pd nanoparticles/chitosan/nitrogen-doped graphene (N-Gra) nanocomposite, we establish an electroanalytical method for simultaneous detection of ascorbic acid (AA), sulfite and oxalic acid (OA) that are closely involved with Vitamin C injection, a widely-used clinical drug. One-step electrodeposition of Pt-Pd bimetallic nanoparticles on chitosan/N-Gra decorated glassy carbon electrode was proposed to construct a well-performing electrocatalyst possessing notable electrochemical activity to the electrooxidation of both sulfite and OA. The electrocatalytic ability was evidenced by the increased current response and decreased oxidation overpotential. More importantly, sufficiently electrochemical resolution of multiple oxidative peaks allowed simultaneous quantitation of the three species of interest. The peak currents measured by differential pulse voltammetry were linear to the analytical concentration of AA, sulfite, and OA, yielding good linear ranges of 2 ~ 400 μM, 8 ~ 600 μM, and 1.5 ~ 500 μM, respectively. Correspondingly, the limit of detection was 0.97 μM, 5.5 μM, and 0.84 μM. This work opens a vista for multiplex assays of pharmaceuticals, including drug principal ingredient, toxic preservative, and decomposed impurity without chromatographic separation, and thus holds promise for the overall quality control for clinical drug.
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Journal of Oleo Science
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2021
·
IF 1.601
Fang-Xiang Xu,Jing-Yu Zhang,Jing Jin,Zu-Guang Li,Yuan-Bin She,Maw-Rong Lee
In the past decade, natural deep eutectic solvents (NADESs) as green and sustainable extraction solvents with great potential for the efficient extraction of bioactive compounds from the plants are emerging. In this study, a microwave-assisted technology is used to prepare natural deep eutectic solvents. And natural deep eutectic solvents as pretreatment solvents coupled with microwave-assisted hydrodistillation (MAHD) for isolating essential oil (EO) derived from turmeric (Curcuma longa L.) is investigated. To improve the essential oil yield of turmeric (Curcuma longa L.) as a target, various factors affecting extraction efficiency including the type and amount of natural deep eutectic solvents, pretreatment time, pretreatment temperature and hydrodistillation (HD) time are discussed and optimized through central composite design (CCD) of the response surface methodology (RSM). The optimal conditions are as follows: natural deep eutectic solvent composed of choline chloride and oxalic acid (molar ratio with 1:1) as a pretreatment solvent, an amount of 60 g, a pretreatment time of 5 min, a pretreatment temperature of 84 ºC, a hydrodistillation time of 76 min. Under the optimum conditions, the highest essential oil yield of 0.85% is achieved. Additionally, the essential oil is analyzed by using gas chromatography-mass spectrometry (GC-MS), with a total of 49 compounds being identified. Through combining natural deep eutectic solvents with a microwave-assisted hydrodistillation technique, this work provides an eco-friendly extraction way of isolating essential oil, which boosts development in the monitoring other spice quality field.
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PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Ting Liang,Biao Wang,Zhenzhong Fan,Qingwang Liu
CeO2 was synthesized by the co-precipitation method on the Cu mesh substrate and modified the surface of CeO2@Cu mesh by stearic acid (SA). The superhydrophobic behavior was ascribed to the combination of hierarchical micro–nanostructure of CeO2 and the hydrophobic alkyl groups from SA. The SA-CeO2@Cu mesh had antiacid and base stability and excellent durability as well as high separation efficiency. The separation efficiency can be up to 98.0% after separating 30 times.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
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IF 5.383
Shixiong Mei,Weili An,Jijiang Fu,Weiyuan Guo,Xiaoyu Feng,Xingxing Li,Biao Gao,Xuming Zhang,Kaifu Huo,Paul K. Chu
Although layered tin sulfide (SnS) nano-architectures are drawing much attention as anode materials in lithium ion batteries (LIBs) because of the high theoretical capacity, there are drawbacks such as the large volume expansion and low conductivity. To overcome these difficulties, attempts have been made to prepare tin sulfide/carbon (SnS/C) nano-hybrids by anchoring/coating nanostructured SnS on/in nano-sized carbon. However, the commonly reported SnS/C composites still suffer from initial Coulombic efficiency (ICE), high electrode swelling, and inferior long-term stability because of weak chemical affinity , and limited contacting interface between SnS and carbon specially at high SnS mass percentage. Herein, we report hierarchical micro-flowers self-assembled from SnS monolayers and nitrogen-doped graphene (NG) lamellar nanosheets (NG-SnS) which are suitable for LIBs anode. The NG-SnS with a high SnS mass percentage (93.9 wt%), obvious C–S bond, and increased contact provide to boost activity, utilization, conductivity, and reversibility of Li storage. Moreover, the elastic NG layers work as a mechanical supporter to decrease the outer volumetric expansion and restrain electrochemical agglomeration of SnS during (de)lithiation processes. The molecular engineered NG-SnS hybrid shows a high initial Coulombic efficiency of 88.2%, robust cycle stability with a high capacity of 790 mAh g −1 after 900 cycles at 0.5 C, considerable rate performance, and small electrode swelling of 12%.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·D638
·
IF 3.12
Pengfei Xu,Xiaohong He,Junwei Mao,Yongming Tang
In this paper, Ti/SnO2-Sb/Ce-PbO2 anode is electrodeposited from MSA bath, and the effect of Ce3+ concentration in bath on the phase composition and morphology of lead dioxide electrode is elucidated. It is found that with the addition of 2 mM Ce3+ ion to the bath the Ce-PbO2 anode exhibits highest stability in 0.5 M H2SO4, and cerium exists as Ce (IV) in the PbO2 film. The electrocatalytic activity of lead dioxide anode for phenol removal is slightly enhanced by the inclusion of Ce. The significant improvement in electrocatalytic activity can be achieved by the addition of small amount of Bi3+ ion to the bath containing Ce3+ ion. In this study, electrocatalytic activities of various anodes follow the order: Ce,Bi-PbO2 > Ce-PbO2 > undoped PbO2 > Bi-PbO2.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2019
·Vol. 14
·期 2
·1-16
·
IF 3.883
Wang Xiangyu,Xie Yu,Yang Guizhen,Hao Jiming,Ma Jun,Ning Ping
The secondary pollution caused by modification of an electrode due to doping of harmful materials has long been a big concern. In this study, an environmentally friendly material, conductive carbon black, was adopted for modification of lead dioxide electrode (PbO 2 ). It was observed that the as-prepared conductive carbon black modified electrode (C-PbO 2 ) exhibited an enhanced electrocatalytical performance and more stable structure than a pristine PbO 2 electrode, and the removal efficiency of metronidazole (MNZ) and COD by a 1.0% C-PbO 2 electrode at optimal conditions was increased by 24.66% and 7.01%, respectively. Results revealed that the electrochemical degradation of MNZ wastewater followed pseudo-first-order kinetics. This intimates that the presence of conductive carbon black could improve the current efficiency, promote the generation of hydroxyl radicals, and accelerate the removal of MNZ through oxidation. In addition, MNZ degradation pathways through a C-PbO 2 electrode were proposed based on the identified intermediates. To promote the electrode to treat antibiotic wastewater, optimal experimental conditions were predicted through the Box-Behnken design (BBD) method. The results of this study suggest that a C-PbO 2 electrode may represent a promising functional material to pretreat antibiotic wastewaters.
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高影响因子
BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Yiyong Wu,Peihong Deng,Yaling Tian,Ziyu Ding,Guangli Li,Jun Liu,Zavuga Zuberi,Quanguo He
A tryptophan (Trp) molecularly imprinted electrochemical sensor was fabricated by drop-coating an imprinted chitosan film on the surface of a glassy carbon electrode modified with multi-walled carbon nanotubes (MIP-MWCNTs/GCE). The surface morphology and electrochemical properties of the MIP-MWCNTs/GCE were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV), respectively. The formation of hydrogen bonds between the functional polymer and the template molecule was confirmed by infrared spectroscopy . The electrochemical performance of the MIP-MWCNTs/GCE with Trp showed that the signal of the oxidation current of Trp obtained with MIP-MWCNTs/GCE was significantly enhanced relative to that of the uncovered GCE, indicating that the modified electrode can accelerate electron transfer and has strong selectivity for Trp. The experimental conditions were optimized in parallel, and under the optimal conditions, the MIP-MWCNTs/GCE showed a good linear relationship between the Trp oxidation peak current and Trp concentrations in the ranges of 2.0 nM–0.2 μM, 0.2 μM–10 μM and 10 μM–100 μM The limit of detection (LOD) was 1.0 nM (S/N = 3), and the modified electrode had good reproducibility and stability. Finally, the MIP-MWCNTs/GCE was successfully applied to the determination of Trp in the human serum samples.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Anish Bhattacharya,Xiangfeng Chu,Qi Gao,Xue Li,Yongping Dong,Shiming Liang,Amit K. Chakraborty
Ethanol sensing is an important area of research given its relevance to human health, traffic control and various industries. Metal oxide semiconductor nanostructures are most commonly used as gas sensors. In this study, enhanced ethanol sensing properties were obtained by incorporation of Gd 3+ ions into Barium Stannate (GBSO), a bimetallic oxide microrods prepared through a simple co-precipitation method. The GBSO films, when exposed to ethanol, showed that incorporation of Gd improved the sensing response till 3 wt% of Gd (3GBSO) loading while further increase in Gd content resulted in reduced response. 3GBSO sample showed response as high as 76 to 500 ppm of ethanol vapor at an operating temperature of 220 °C along with a very low detection limit of 0.1 ppm (response of 1.5). Good repeatability and moderate stability were also observed suggesting its potential as low-cost ethanol sensor. Significant increase in both specific surface area as well as oxygen content (as measured by x-ray photoelectron spectroscopy) was observed in 3GBSO sample compared to that of BSO. Thus, we showed that incorporation of Gd improved the surface area of BSO microrods and in turn the surface adsorption of oxygen which led to their enhanced response to ethanol.
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