Food Analytical Methods
·
2020
·Vol. 13
·期 8
·1673-1680
·
IF 2.667
Cheng Zhu,Ran Qin,Liu Jie,Deng Xing,Qiu Huidong,Jia Zhengfu,Su Xiaodong
Preservatives and sweeteners are always added in the food production process, which can extend the life and flavor of food. Benzoic acid and saccharin sodium are commonly used as preservatives and sweeteners respectively. Phenyllactic acid as a natural preservative, mainly produced by phenylalanine fermentation, may exist in fermented food. The objective of the current study is to develop a reverse-phase HPLC-UV method for simultaneous determination of benzoic acid, sorbic acid, phenyllactic, phenylalanine, and saccharin sodium in vinegar. They were separated on Sapphiresil TM (C 18 ) column (250 × 4.6 mm, 5 μm) with a mobile phase consisting of methyl alcohol:ammonium acetate buffer (pH 6.44; 0.02 M) (20:80, v/v) ran in isocratic mode at a flow rate of 1 mL/min. Complete baseline separation of five analytes was achieved in < 12 min, the linear range was 0.25–50 μg/mL with a correlation coefficient R 2 value > 0.9975, the method was validated with recoveries in the 96.93 to 118.42% range, and RSD was 0.39–6.21%. The detection limits of phenylalanine, benzoic acid, saccharin sodium, sorbic acid, and phenyllactic acid were 0.25, 0.01, 0.01, 0.025, and 0.05 mg/L. This method could be used for determining of benzoic acid, sorbic acid, phenyllactic acid, phenylalanine, and saccharin sodium in vinegar.
Graphical abstract
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 2
·328-334
·
IF 1.307
Wang Jia,Qiu Huayu,Zhao Zhiming,Zhang Yuchen,Zhao Jingwen,Ma Yinglei,Li Jiedong,Xing Min,Li Guicun,Cui Guanglei
Aqueous zinc(Zn)-metal cells with cost-effective components and high safety have long been a promising large-scale energy storage system, but Zn anodes are intrinsically unstable with common aqueous electrolytes, causing substantial underutilization of the theoretical capacity. In this work, we report a strictly neutral aqueous Zn electrolyte at a low cost by leveraging the dynamic hydrolysis equilibrium of a dual-salt Zn(Ac) 2 /NaAc(Ac: CH 3 COO − ) formulation. With the pH regulation, the corrosion and hydrogen evolution encountered in Zn anodes can be suppressed significantly. This hybrid aqueous electrolyte not only enables dendrite-free Zn plating/stripping at a nearly 95% Coulombic efficiency[an increase of 24% compared to that of the single-salt 1 mol/L Zn(Ac) 2 electrolyte], but also supports the reversible operation of Zn cells paired with either Na 3 V 2 (PO 4 ) 3 or iodine cathodes—the former delivers a high output voltage of 1.55 V with an energy level of 99.5 W·h/kg(based on the mass of the cathode), and the latter possesses a high specific capacity of 110.9 mA·h/g while yielding long-term cyclability(thousands of cycles). These findings open up a new avenue of modifying practical electrolytes having targeted properties to stabilize multivalent metal anodes.
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CATALYSIS LETTERS
·
2020
·Vol. 150
·期 12
·3394-3401
·
IF 2.482
Qiao Chenxia,Jia Wenlan,Zhong Qiming,Liu Bingyu,Zhang Yifu,Meng Changgong,Tian Fuping
Abstract Novel Cu-nanoparticles (NPs) embedded in porous carbon materials (Cu@C-x) were prepared by one-pot pyrolysis of metal–organic frameworks (MOF) HKUST-1 at different temperatures. The obtained material Cu@C-x was used as a cost-effective catalyst for the hydrogenation of nitrobenzene using NaBH 4 as the reducing agent under mild reaction conditions. By considering the catalyst preparation and the catalytic activity, a pyrolysis temperature of 400 °C was finally chosen to synthesize the optimal catalyst. When the aromatic nitro compounds with reducible groups, such as cyano, halogen, and alkyl groups, were tested in this catalytic hydrogenation, an excellent selectivity approaching 100% was achieved. In the recycling experiment, a significant decrease in nitrobenzene conversion was observed in the third cycle, mainly due to the very small amount of catalyst employed in the reaction. Hence, the easily prepared and cost-effective Cu@C-400 catalyst fabricated in this study demonstrates potential for the applications in selective reduction of aromatic nitro compounds. Graphic Abstract The catalyst Cu@C-400 exhibited 100 % conversion and high selectivity for the hydrogenation of industrially relevant nitroarenes.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2024
·Vol. 18
·期 9
·1-10
·
IF 6.1
Li Jing,Yang Dazhong,Zou Wensong,Feng Xuezhen,Wang Ranhao,Zheng Renji,Luo Siyuan,Chu Zheting,Chen Hong
Red soil, the most critical soil resource in tropical/subtropical regions worldwide, faces tremendous threats, including nutrient deficiency, acidification, and heavy metal contamination. There is a great demand for multifunctional eco-materials capable of modifying this situation. Herein, we used widely distributed soil and biomass to develop a zeolite/biochar composite for synergistic red soil remediation and amendment. With the composite material, the Pb 2+ and Cd 2+ remediation efficiencies reached 92.8% and 92.9%, respectively, in stems under optimal conditions. Moreover, the acidity and nutrient deficiency conditions of red soil significantly improved. The atomic-scale interaction mechanism during the remediation and amendment process was elucidated with complementary characterization methods, which revealed that in the zeolite/biochar composite material, zeolite contributes to long-term heavy metal remediation effects. Simultaneously, biochar is responsible for soil quality amendment and short-term heavy metal remediation. Furthermore, for the first time, single-atom heavy metal ions were observed on biochar during the remediation process, indicating the broad distribution of single atoms in the natural environment.
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高影响因子
RARE METALS
·
2020
·Vol. 40
·期 6
·1383-1390
·
IF 2.161
Zhu Ling,Yang Xue-Xian,Xiang Yan-Hong,Kong Peng,Wu Xian-Wen
Abstract Sodium-ion batteries (SIBs) have attracted significant attention with respect to renewable energy power generation systems because of the abundant reserves of sodium on earth. However, anode materials are presently limited by low energy density, poor rate performance and inferior cycling stability. In recent years, tin disulfide (SnS 2 ) with a particular layered structure has been considered as a promising anode material for SIBs due to its high theoretical capacity and low cost. Herein, a nervous-system-like structured SnS 2 /CNTs composite was successfully synthesized via a hydrothermal method. The SnS 2 sheets were strung with carbon nanotubes (CNTs) to form a hierarchical porous structure, which is effective for electrolyte diffusion and electronic transmission. The large distance of the (001) plane (0.5899 nm) of SnS 2 favors Na + insertion–extraction dynamics. Benefitting from these structural characteristics, SnS 2 /CNTs electrodes exhibit high specific capacity, excellent rate performance and superior cycling stability. A high charge capacity of 642 mAh·g −1 was released at 0.2 A·g −1 , and then, a high reversible capacity of 427 mAh·g −1 was retained after 100 cycles. Even charged at 2 A·g −1 , the SnS 2 /CNTs electrode maintained a capacity of 282 mAh·g −1 . The nervous-system-like structure of the SnS 2 /CNTs composite provides a novel strategy for the development of SIBs with high electrochemical performance. Graphic abstract
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2020
·Vol. 231
·期 10
·1-18
·
IF 1.9
Liu Huan,Xu Chao,Wei Xueling,Ren Yiming,Tang Dingxing,Zhang Cuige,Zhang Rongli,Li Fang,Huo Chaofei
In this study, activated carbons were prepared from bamboo via carbonization and successive KOH activation by tuning the post-treatment procedure. The resultant carbons possessed high surface area, high oxygen doping, and 3D hierarchical porous structure with interconnected micro-, meso- and macropores. These features resulted in ultra-excellent adsorption capacity for rhodamine B (> 1200 mg/g). Furthermore, the kinetic and isotherm experimental data were best described by pseudo-second kinetic model and Langmuir isotherm model, respectively. The adsorption of RhB onto the as-synthesized carbons was a spontaneous endothermic process. The π–π stacking, hydrogen bond, and acid-base interaction were proposed to account for the adsorption mechanism. Moreover, SiO 2 in bamboo-based carbon functioned as frameworks and its removal via alkali treatment led to the collapse of porous structure, decreasing surface area, pore volume, and O heteroatom doping, consequently dropping the adsorption performance. Overall, bamboo as an abundant and renewable biomass could be considered as a potential precursor for the production of excellent adsorbent for wastewater purification.
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高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 1
·138-149
·
IF 2.372
Wang Xiaohui,Wu Xiao,Guo Kunmao,Ren Junli,Lin Qixuan,Li Huiling,Wang Xiaohui,Liu Shijie
Abstract A feasible approach was developed to quickly hydrolyze microcrystalline cellulose (MCC) into glucose using a new carbon-based solid catalyst (CSC). The catalysts possessed the structure of mesoporous carbon with weak acidic carboxylic and phenolic groups. 83.94% yield of glucose was achieved at 200 °C for 50 min using mixed ball milling of MCC and CSC. The catalysts showed excellent recyclability and catalytic activity after five cycles. Graphic Abstract
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-10
·
IF 16.419
Shi Bao,Li La,Chen Aibing,Jen Tien-Chien,Liu Xinying,Shen Guozhen
Highlights
Ti 3 C 2 T x MXene-based coaxial zinc-ion hybrid fiber supercapacitors (FSCs) were fabricated with braided structure, which can be prepared continuously and present excellent flexibility and ultrastability.
A sports watch driven by the watch belts which weaved uses the obtained zinc-ion hybrid FSC and LED arrays lighted by the FSCs under embedding into textiles, demonstrating the great potential application in smart wearable textiles.
Abstract Zinc-ion hybrid fiber supercapacitors (FSCs) are promising energy storages for wearable electronics owing to their high energy density, good flexibility, and weavability. However, it is still a critical challenge to optimize the structure of the designed FSC to improve energy density and realize the continuous fabrication of super-long FSCs. Herein, we propose a braided coaxial zinc-ion hybrid FSC with several meters of Ti 3 C 2 T x MXene cathode as core electrodes, and shell zinc fiber anode was braided on the surface of the Ti 3 C 2 T x MXene fibers across the solid electrolytes. According to the simulated results using ANSYS Maxwell software, the braided structures revealed a higher capacitance compared to the spring-like structures. The resulting FSCs exhibited a high areal capacitance of 214 mF cm –2 , the energy density of 42.8 μWh cm −2 at 5 mV s −1 , and excellent cycling stability with 83.58% capacity retention after 5000 cycles. The coaxial FSC was tied several kinds of knots, proving a shape-controllable fiber energy storage. Furthermore, the knitted FSC showed superior stability and weavability, which can be woven into watch belts or embedded into textiles to power smart watches and LED arrays for a few days.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 12
·7240-7249
·
IF 1.938
Tang Jing,Chen Mingming,Xu Hui
Zn ion-doped amorphous NiWO 4 nanospheres (named ZNWO) were successfully synthesized using a simple chemical coprecipitation method. The specific surface area and pore size of NiWO 4 were significantly improved owing to the Zn atom dopant. Compared with NiWO 4 , the conductivity of ZNWO increases and, more importantly, the energy gap decreases. This is mainly because Zn atoms are used as dopants to generate energy levels in the forbidden band of NiWO 4 , which decreases the energy absorption of electronic transitions. When tested under a traditional three-electrode system, the obtained Zn-doped NiWO 4 with 10 at.% Zn (labeled ZNWO-10) delivered an impressive specific capacitance of 653.75 F g -1 at a current density of 1 A g −1 , with a capacitance retention of 64.1% at 1 A g -1 over 1000 cycles. However, pristine NiWO 4 displayed an inferior capacitance retention of 6.4% under the same conditions. Studying confirms the availability of electronic structure control in NiWO 4 by introducing Zn atoms for pseudocapacitance (PC). When it is combined with an activated carbon (AC) electrode, the ZNWO//AC device exhibits a maximum energy density of 34.4 W h kg -1 at a power density of 525 W kg -1 and excellent cycling stability, with 116.3% retention after 1000 cycles. This study provides new options and an important foundation for application in asymmetric supercapacitors.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6456-6468
·
IF 2.779
Ni Yafei,Li Haoyue,Li Haimin,Zhuang Jia,Liu Xingchong,Zheng Ronghong,Zhao Shuangshuang,Zhang Hua,Wang Hanyu
It is crucial to promote crystallinity of active layer to improve stability and restrain non-radiative carrier recombination for high-quality perovskite solar cells (PSCs). Here, Chlorpheniramine Maleate (CM) interface layer is introduced between SnO 2 electron transport layer (ETL) and perovskite (PVK) film. The esterification between carboxyl group in CM and hydroxyl group on the surface of SnO 2 greatly enhances the surface evenness of SnO 2 , leading to enhanced smoothness of ETL; thus, the crystallinity of perovskite (PVK) film is validly improved. Meanwhile, the lone pair electrons of nitrogen element in pyridine group in CM coordinate with vacant orbit of Pb 2+ in perovskite that validly decreases the defects of active layer. Thus, the CM interface results into strong connection between PVK and ETL, which greatly enhances the performance and stability of PSCs. After CM modification, the PCE of the PSCs is increased from 19.29 to 21.12%. In addition, unencapsulated CM-modified devices demonstrate much better humidity stability than unmodified one due to high quality of the perovskite film. After 100 h under RH = 70 ± 5% in air condition, the SnO 2 -CM based device still remains 60% of its initial PCE, while the PCE of unmodified device totally breaks down after 72 h.
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JOM
·
2024
·Vol. 76
·期 8
·4169-4178
·
IF 2.1
He Jie,Liu Jiaming,Yu Xiuyuan,Yang Chao,Liu Qingsheng
LiFePO 4 has become a mainstream cathode material, owing to its good safety and low price. However, its intrinsic limitations in terms of electronic and ionic conductivities hinder its further advancements. To overcome this challenge, element doping has been explored to enhance its conductivity. Here, Na and F co-doped LiFePO 4 /C was successfully synthesized via a carbothermic method. Structural characterization techniques were employed to confirm the formation of Li 0.97 Na 0.03 FePO 3.97 F 0.03 with controllable particle sizes. The incorporation of Na and F ions into the LiFePO 4 lattice results in a reduction of the Li-O bond energy. This decrease in bond energy facilitates the extraction and insertion of lithium ions during the charge and discharge processes, subsequently improving the overall kinetics of lithium-ion diffusion. Simultaneously, lattice distortion induced by doping led to charge compensation and accelerated Li + migration. Benefiting from the enhancement of intrinsic conductivity and Li + diffusivity, the specific capacitance of the co-doped LiFePO 4 /C cathode material was found to be 160 and 110 mAh g −1 at 0.1 and 5 C, respectively. Further, density functional theory calculations showed that Na/F co-doping enhanced the structural evolution in the material and increased free carrier concentration in LiFePO 4 . This work demonstrates that synergistic Na and F co-doping can optimize the rate performance of LiFePO 4 by enhancing intrinsic conductivity and Li + diffusivity, suggesting promising applications of the co-doped LiFePO 4 /C in high-power lithium-ion batteries for electric vehicles and grid-level energy storage systems.
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高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 3
·487-502
·
IF 12.958
Zhou Lei,Tufail Muhammad Khurram,Liao Yaozu,Ahmad Niaz,Yu Peiwen,Song Tinglu,Chen Renjie,Yang Wen
All-solid-state Li-SeS 2 batteries (ASSLSs) are more attractive than traditional liquid Li-ion batteries due to superior thermal stability and higher energy density. However, various factors limit the practical application of all-solid-state Li-SeS 2 batteries, such as the low ionic conductivity of the solid-state electrolyte and the poor kinetic property of the cathode composite, resulting in unsatisfactory rate capability. Here, we employed a traditional ball milling method to design a Li 7 P 2.9 W 0.05 S 10.85 glass–ceramic electrolyte with high conductivity of 2.0 mS cm − 1 at room temperature. In order to improve the kinetic property, an interpenetrating network strategy is proposed for rational cathode composite design. Significantly, the disordered cathode composite with an interpenetrating network could promote electronic and ionic conduction and intimate contacts between the electrolyte–electrode particles. Moreover, the tortuosity factor of the carrier transport channel is considerably reduced in electrode architectures, leading to superior kinetic performance. Thus, assembled ASSLS exhibited higher capacity and better rate capability than its counterpart. This work demonstrates that an interpenetrating network is essential for improving carrier transport in cathode composite for high rate all-solid-state Li-SeS 2 batteries. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）