CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yue Sun,Yingpeng Gu,Jinpeng Yang
N-heterocyclic compounds (NHCs) in industrial wastewater, such as pyridine, have potential toxicity to organisms and are difficult to biodegrade, causing great harm to the environment and human health. In this work, four sulfonic acid-functionalized resins (30-R, 40-R, 60-R and 70-R) with different sulfonation degree were prepared on the basis of the conventional hypercrosslinked resin by controlling the reaction temperature with concentrated sulfuric acid. The batch experiments showed that the adsorption capacities of pyridine on the sulfonic resins are pH-dependent, and the optimum pH increases with the increase of sulfonation degree. The adsorption of pyridine on the resin was monolayer, and the maximum adsorption capacity fitted by Langmuir model was positively correlated with sulfonation degree. The fitting results of Weber-Morris model showed that high sulfonation degree meant high intraparticle diffusion rate. The driving forces of adsorption included electrostatic attraction, π-π conjugation and hydrophobic interaction. Although the electrostatic attraction, which played the most important role, significantly improved the adsorption capacity of the sulfonic resin, it weakened the effect of the other two. This phenomenon was caused by the introduction of sulfonic groups significantly promoted the adsorption performance of the resin for single-ring NHCs, but that for fused-ring NHCs with π-electron-rich regions and strong hydrophobicity was unremarkable, or even decreased. Under the synergism of the three driving forces, sulfonic acid-functionalized hypercrosslinked resin exhibited superior adsorption performance for NHCs with easy protonation, high π-electron cloud density and strong hydrophobicity.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hui Yue,Jinri Chen,Xu Chen,Xiaoli Wang,Yuting Zhang,Nandi Zhou
Sialic acids (SAs), particularly its most common derivative N-acetylneuraminic acid (Neu5Ac) are involved in many biological processes in vivo . Thus it is of great significance to detect Neu5Ac and trace the sialylation of glycoproteins and other bio-active molecules. Aptamers are molecular elements for bio-recognition with high affinity, which have been widely used in bioanalysis and imaging. However, the ideal aptamers for saccharides have seldom been reported. Magnetic beads (MB)-based SELEX is a commonly used method for screening of aptamers. Herein, three types of MB-based SELEX with different immobilization manners were carried out to systematically study and compare the screening efficiency, which may provide reference for screening of aptamers specific for low-molecular targets. After screening and sequencing, the obtained aptamer sequences were aligned and analyzed, among which three aptamers were selected as candidates. Then, the aptamer ap 3-1 with the highest affinity was optimized according to the results of molecular simulation docking. An optimal aptamer ap 3-1-a with 21 nucleotides (nt) was eventually obtained, with the K d value of 55.71 ± 12.29 nM. To verify the practicability of the aptamer, a fluorescent biosensor for Neu5Ac was constructed employing graphene oxide (GO)-based fluorescence quenching and Neu5Ac-induced fluorescence restoration. The biosensor showed a linear response range within 20−1000 nM. The specificity was verified and the interferents-resistance was validated by detecting Neu5Ac in actual samples. This study may inspire the efficient and universal strategy for screening and application of robust and practicable aptamers for low-molecular targets.
研究领域:
生物化学
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分子生物学
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分析化学
✓ 已验证
DOI
高影响因子
Petroleum Science
·
2023
·
IF 5.6
Fan Ding,Xin Jin,Tao Shen,Shan-Shan Mao,Qing Zhao,Mang-Lai Gao
Wettability is an important surface property that deserves to further explore the factors on its alteration. Series of bis -N-heterocyclic quaternary ammonium salts with different spacer length and N-heterocyclic headgroups (morpholinium (BMMB, BMMD and BMMH), piperidinium (BPMH) and piperazinium (BMPMH)) have been synthesized and employed for altering the wettability of vermiculite and its derivates (Vts) treated by Li + -saturated heating method. The results of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG-DTG), scanning electron microscopy (SEM) and N 2 adsorption/desorption isotherms indicate that all of the bis -N-heterocyclic quaternary ammonium salts have been successfully inserted into the vermiculite layers, leading to the organic monolayer. The results of capillary rise tests combined with Lipophilic to Hydrophilic Ratio ( LHR ) values unveil the wettability alteration of the organo-Vts. As the layer charge decreases, the hydrophilicity of the organo-Vts gradually increases, which is probably caused by the decline in binding sites. As the result of the change in spacer length of modifier, the wetting properties of morpholinium-based organo-Vts change in order of BMMD-Vts > BMMH-Vts > BMMB-Vts, and difference in N-heterocyclic headgroups leads to the sequence of wettability: BMPMH-Vts > BPMH-Vts > BMMH-Vts. Layer charge of Vt, spacer length and the type of the N-heterocyclic headgroup of modifier have the synergistic effect on the regulation of the wettability.
研究领域:
材料科学
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表面化学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Yu Feng,Huihang Zhang,Deming Zhang,Fuqiang Chen,Xinhai Xu,Jiang Qin,Yi Jiao
The cracking of on-board hydrocarbon fuels is a strong endothermic reaction and can provide an additional chemical heat sink in the cooling process of the hypersonic vehicle. However, the cooling capacity of current hydrocarbon fuels can hardly meet the cooling requirements of the hypersonic vehicle at higher flight speeds. Blending ethanol is an effective method to improve the chemical heat sink of hydrocarbon fuels, but the mechanism of ethanol on chemical heat sink is unclear. In this study, n-decane was selected as a model compound of hydrocarbon fuels to investigate the physical and chemical effect of ethanol on the chemical heat sink of n-decane cracking by analyzing the chemical reactions involved through experimental study and chemical dynamic simulation. The results indicate that there is an optimum ethanol blend ratio to achieve the maximum chemical heat sink. The carbon monoxide methanation reaction which is an exothermic reaction can deteriorate endothermic process at 300–375 °C. With ethanol blending ratio above 20 wt%, ethanol vaporization deteriorates chemical heat sink by reducing the residence time in the temperature range of 225–250 °C. Pressure can suppress the reduction of residence time caused by ethanol evaporation and also suppress the positive reaction of ethanol cracking. The kinetic model of ethanol and n-decane mixture cracking was established. The calculated results verify that ethanol cracking ( C 2 H 5 OH =CO+ C H 4 + H 2 ) and methane cracking ( C H 4 =C+ 2H 2 ) are dominant reactions in ethanol-assisted n-decane thermal cracking below 475 °C.
研究领域:
能源科学
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化学工程
·
航空航天工程
✓ 已验证
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 71
·57482-57489
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IF 3.84
Qianchun Zhang,Feifei Meng,Lin Zha,Xingyi Wang,Guoyi Zhang
In this paper, we developed a cataluminescence-based sensor using SrCO3/graphene for sensitive and selective detection of n-propanol. The composite was characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and gas adsorption. The sensor was coupled with a miniature vaporizing device to detect n-propanol in liquid samples. The experimental results revealed that the SrCO3/graphene sensor exhibited a sensitivity for n-propanol 5.8 times higher than that of pure SrCO3, indicating that the sensitivity of the SrCO3/graphene sensor was increased by adding graphene to SrCO3. The linear range of the sensor was 0.2 to 32 mg L−1 (r = 0.9987) with a limit of detection of 0.08 mg L−1. The sensor showed a rapid response of 2 s and a recovery time of 20 s, respectively. The sensor was used to analyze samples spiked with known concentrations of n-propanol. The concentrations of n-propanol in all samples were well quantified with satisfactory recoveries, indicating that the SrCO3/graphene sensor is a promising candidate for fast, sensitive, selective detection of n-propanol. We also discuss the possible mechanism based on the reaction products.
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Energy
·
2023
·Vol. 18
·期 1
·42-53
·
IF 2.9
Fang Can,Tang Xiangmei,Wang Jiaoyan,Yi Qingfeng
Highly efficient and stable iron electrodes are of great significant to the development of iron-air battery (IAB). In this paper, iron nanoparticle-encapsulated C-N composite (NanoFe@CN) was synthesized by pyrolysis using polyaniline as the C-N source. Electrochemical performance of the NanoFe@CN in different electrolytes (alkaline, neutral, and quasi-neutral) was investigated via cyclic voltammetry (CV). The IAB was assembled with NanoFe@CN as the anode and IrO 2 + Pt/C as the cathode. The effects of different discharging/charging current densities and electrolytes on the battery performance were also studied. Neutral K 2 SO 4 electrolyte can effectively suppress the passivation of iron electrode, and the battery showed a good cycling stability during 180 charging/discharging cycles. Compared to the pure nano-iron (NanoFe) battery, the NanoFe@CN battery has a more stable cycling stability either in KOH or NH 4 Cl + KCl electrolyte.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 7
·2147-2154
·
IF 8.02
Alei Zhang,Cong Gao,Jing Wang,Kequan Chen,Pingkai Ouyang
In this study, we present an efficient affinity adsorption–enzymatic reaction integrated approach to produce N-acetyl-D-glucosamine (GlcNAc) from crude chitin powders (CP). Chitinase was first purified from the crude enzyme mixture by affinity adsorption on the CP substrate, with ∼92.7% recovery of the enzyme achieved within 10 minutes in the presence of 20 g L−1 of CP under optimized conditions. The chitinase then efficiently converted 40 g L−1 of CP to 39.3 g L−1 of GlcNAc in a batch enzymatic reaction for 4 days, achieving nearly 100% conversion of the substrate CP. The product GlcNAc was easily separated from hydrolysates after destaining, concentrating, crystallizing and drying processes with a high purity of 98%. In addition, the chitinase can be conveniently reused for several batches by the affinity adsorption–enzymatic reaction approach, giving an average yield of 29.6 g L−1 of GlcNAc based on 30 g L−1 of CP as the substrate.
研究领域:
生物化学
·
酶工程
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Yanan Deng,Yuanyuan Shen,Yao Du,Takashi Goto,Jianfeng Zhang
The development of high-performance electrode materials with a far-from-enough energy density has still been crucial for the real applications of supercapacitor technology. In this paper, the N-doped and derivatized-carbon-intercalated Ti 3 C 2 T x , abbreviated as N–Ti 3 C 2 T x /C, was firstly fabricated using ZIF-67 as an intermediate precursor. Then N–Ti 3 C 2 T x /C/CuS was prepared by further intercalation with CuS nanoparticles through a room-temperature-in-situ-reaction route. The doped pyridine N and pyrrolic N, together with derivatized carbon, optimized the surface charge distribution of Ti 3 C 2 T x with increased active sites. In addition, CuS nanoparticles were observed distributed on the surface and between layers of single/multi-layered two-dimensional N–Ti 3 C 2 T x /C nanosheets, forming a heterogeneous three-dimensional structure. Therefore, the specific capacitance of the N–Ti 3 C 2 T x /C/CuS composite at a current density of 1 A g −1 reached 1205.8 F g −1 , about 5 times that of N–Ti 3 C 2 T x /C and 2 times of CuS, also much higher than other composite reported in the literature. The energy density and power density of N–Ti 3 C 2 T x /C/CuS, as a symmetric supercapacitor electrode, are 77.22 Wh·kg −1 and 649.54 W kg −1 , respectively. More importantly, N–Ti 3 C 2 T x /C/CuS has an excellent stability after 3000 cycles, surpassing that of similar electrode materials reported in literature. This study opens a new direction for enhancing the energy density of supercapacitors with modified electrode materials through a MOF-mediated strategy.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10352-10358
·
IF 3.288
Danlin Bu,Na Li,Yu Zhou,Hengyu Feng,Fei Yu,Chunxia Cheng,Ming Li,Linghan Xiao,Yuhui Ao
N-Halamine-based antibacterial materials are widely used due to their excellent characteristics. However, the N–Cl bonds in N-halamine-based materials are not stable under UV light irradiation so that they are difficult to recover and reuse. Here, a kind of N-halamine-immobilized Fe3O4@SiO2@TiO2(F@S@T-Cl) nanoparticles were prepared. In addition, the UV stability and regeneration capacity were also studied after variable time exposure to UV light. The results showed that nanoparticles have great antibacterial properties against Staphylococcus aureus and Escherichia coli. Meanwhile, the N–Cl bond in the nanocomposite showed outstanding storage stability under UV light irradiation and good regeneration ability; the material can realize cyclic utilization and solve the problem of secondary pollution of the antibacterial material. It provides a broader application prospect for the recyclable N-halamine antibacterial material.
研究领域:
材料科学
·
生物学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2019
·
IF 1.398
Ling Li,Hui Ji
The present study investigated the protective effects of the polyphenol epicatechin on the protein structural changes, gel properties and N-nitrosodiethylamine (NDEA) formation of oxidatively stressed myofibrillar protein (MP). Results showed that oxidation treatments to MP significantly increased their carbonyl content and surface hydrophobicity as compared to the control groups (p < 0.05). Epicatechin inhibited protein carbonyl content and surface hydrophobicity, especially treated with 2 mM epicatechin. Under oxidative conditions, the fluorescence intensity of tryptophan gradually decreased with the increase of epicatechin concentrations from 0 to 2 mM. The storage modulus (G’) was increased gradually after oxidation and epicatechin treatment. Epicatechin reduced the loss of P22 and water holding capacity (WHC), promoted the hydration of the proteins. Under oxidative conditions, epicatechin had a concentration dependent effect on the formation of NDEA; low concentrations of epicatechin promoted NDEA formation, while high concentrations inhibited NDEA production. In conclusion, an appropriate quantity of polyphenols can inhibit the oxidation of MP and formation of N-nitrosamines.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Weiwei Guo,Yuting Shuai,Xuecheng Liu,Jie Zhang,Jiang Wang,Khaled H. Mahmoud,Zeinhom M. El-Bahy,N.M. Mubarak
N-butanol, a poisonous and flammable liquid, has great threat to human life and property security, which is of importance to monitor n-butanol in the environment. In this paper, the pure and Co-doped BiVO 4 polyhedrons are successfully synthesized by hydrothermal method . A series of characterizations, such as XRD , XPS, SEM, UV, and EIS, etc., are used to analyze the crystal structure, morphology, element compositions , optical and electrochemical properties of the as-prepared samples. The optimal sample (3Co-BiVO 4 ) exhibits high gas response (51.65) toward 100 ppm n-butanol, which is around four times higher than that of pure BiVO 4 at 300 °C. In addition, the 3Co-BiVO 4 also has fast response-recovery time, good humidity resistance, favorable selectivity to n-butanol, etc. Based on the above characterizations and gas sensing test results, the enhanced gas sensing mechanism for 3Co-BiVO 4 is proposed. This work provides a feasible strategy to fabricate BiVO 4 polyhedron by doping Co to greatly enhance the gas sensing properties for n-butanol.
研究领域:
材料科学
·
环境监测
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shiying Lin,Lanlan Mo,Feijun Wang,Ziqiang Shao
Heteroatom doping is a significant modification of carbon materials for electrodes in storage device and co-doping has synergistic improvement effect. This work reports a N/O co-doped porous carbon (CPK800) from crosslinking sodium carboxymethyl cellulose and poly (m-phenylene diamine). The material characterization reveals its large specific surface area of 1501.3 m 2 g −1 with optimum micro- and mesopore distribution, partially graphitized carbon and high N, O concentration. This carbon has 3D interconnected porous structure and internal conducting network providing rapid ion and electron transportation. Take these advantages, it exhibits high capacitance of 358 F/g at 1 A g −1 , an excellent rate retention of 70.8% at a high current density of 20 A g −1 , and superior cyclic stability of 97.8% capacitance retention after 10,000 cycles at 10 A g −1 as an electrode material in 3 M KOH electrolyte. Moreover, the assembled symmetric supercapacitor device (CPK800//CPK800) delivers a high energy density of 11.5 Wh kg −1 at a power density of 326.8 W kg −1 and still have energy density of 8.9 Wh kg −1 at a very high power density of 6.8 kW kg −1 . The well-developed structure and outstanding electrochemical performance demonstrate the promising potential of CPK800 as electrode material for advanced energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）