ANALYTICAL LETTERS
·
2024
·
IF 1.6
Zixuan Wang,Ganghui Chu,Juan Peng,Shiyi Chen
Internal reference probes can effectively eliminate internal and external interferences. Hence, finding a suitable internal reference probe is the key to ratiometric electrochemistry. In this study, a simple and sensitive ratiometric electrochemical sensor for the determination of rutin was prepared for the first time using rhodamine B (Rh B) as an internal reference probe. The modified electrochemical sensor was constructed by electrodepositing gold nanoparticles (AuNPs) on a glassy carbon electrode followed by drop-coating chitosan-immobilized rhodamine B (CS@Rh B). Rh B has a dual function in that it has a stable electrochemical signal (1.18 V) (vs. Ag/AgCl) that is completely separated from the oxidation peak of rutin (0.52 V) to serve as an internal reference probe. At the same time, it synergistically enhances the electrochemical signal of rutin with AuNPs. When differential pulse voltammetry was used for the determination of rutin, the current ratio of IRutin/IRh B was employed as the signal for rutin determination with a wide linear range (0.1 to 70 μM) and a low detection line (0.028 μM). The recoveries for the determination of rutin in Coreopsis tinctoria and Buckwheat tea were 95.4%–106% and 95.3%–104%, respectively. This work successfully demonstrated the feasibility of Rh B as an internal reference probe.
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Polymers
·
2023
·Vol. 16
·期 1
·97
·
IF 5
Ouyang Shi,Peng Li,Chao Yang,Haitian Jiang,Liyue Qin,Wentao Liu,Xiaolin Li,Zhenming Chen
In this experiment, a series of poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) (PPFEG) copolymers with different ratios were synthesized using melt polycondensation of dimethylfuran-2,5-dicarboxylate (DMFD), 1,3-propanediol (PDO) and poly(ethylene glycol) (PEG). The effect of PEG content on the crystallization behavior of the poly(propylene 2,5-furan dicarboxylate) (PPF) copolymers was investigated. For PPF, the nucleation density of theβ-crystals was higher than that ofα-crystals. AsTcincreases, theβcrystals are suppressed more, but atTc= 140 °C, the bulk of PPF has already been converted toαcrystals, which crystallize faster at higher nucleation densities, resulting in a difference in polymer properties. For this case, we chose to add a soft segment material, PEG, which led to an early multi–melt crystallization behavior of the PPF. The addition of PEG led to a decrease in the crystallization temperature of PPF, as well as a decrease in the cold crystallization peak of PPF. From the crystalline morphology, it can be seen that the addition of PEG caused the transformation of the PPF crystalline form to occur earlier. From the crystalline morphology of PPF at 155 °C, it can be observed that the ring-banded spherical crystals of the PPF appear slowly with increasing time. With the addition of PEG, spherical crystals of the ring band appeared earlier, and even appeared first, and then disappeared slowly.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yingying Jiao,Yike Li,Jianshe Wang,Zhanhang He,Zhongjun Li
Graphitic carbon nitride (g-C 3 N 4 ) is a promising photocatalyst for water hydrogen evolution. Nonetheless, fast recombination of photogenerated electron-hole pairs and the slow kinetics of hydrogen production result in the unsatisfactory efficiency of solar hydrogen production. we address this issue by anchoring the cobalt phosphide (CoP) cocatalyst onto the one-dimensional boron doped g-C 3 N 4 nanotube (B-CNNT) to construct B- N -Co surface bonding states in the B-CNNT/CoP photocatalyst. Spectroscopic measurement and density functional theory (DFT) calculations demonstrated that the B- N -Co bonds optimize the local electronic distribution of bonded Co and adjacent P atoms, strengthen the electrons’ delocalization capacity of Co atoms for high electrical conductivity and accelerate the photogenerated carrier transfer between B-CNNT and CoP, which lead to the enhanced photocatalytic activity of the B-CNNT/CoP photocatalyst for hydrogen evolution. B-CNNT/CoP-2.45% achieved a remarkable photocatalytic hydrogen production rate of 784 μmol g -1 h −1 with an apparent quantum efficiency of 5.32% at 420 nm, which is significantly higher than demonstrated by CNNT/CoP-2.45% (153 μmol g -1 h −1 ). Our findings provide insights into as well as establish theoretical and practical grounds for the development of low-cost, high-performance photocatalytic materials for hydrogen evolution.
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RSC Advances
·
2021
·Vol. 11
·期 14
·8255-8263
·
IF 3.361
Jun Wu,Wei Liu,Rui Zhu,Xiashi Zhu
A special self-designed device based on poly-1-vinyl-3-pentylimidazole hexafluorophosphate (PILs-C5) solid-phase extraction and high performance liquid chromatography (HPLC) is proposed as a novel method for the on-line separation and analysis of Rhodamine B (RhB) dye. Single factor experiment design and orthogonal experiment design were used to optimize the experimental parameters, such as pH, the amount of PILs-C5, sample volume, flow rate, eluent type, eluent concentration, eluent volume, and the flow rate of eluent. Under the optimized conditions, the linear range was 0.02–2.4 μg mL−1, with the correlation coefficients (R2) of 0.997. The limit of detection (LOD) and limit of quantification (LOQ) were 0.004 μg mL−1 and 0.02 μg mL−1, respectively. The extraction capacity was 6.22 mg g−1, and enrichment ratio was 15. The extraction mechanism and the post-treatment method of PILs-C5 were also studied. This method was applied to analyze RhB in a wide variety of real samples with satisfactory results.
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Nanomaterials
·
2021
·Vol. 11
·期 5
·1335
·
IF 5.076
Zhengpeng Yang,Xiaoting Lv,Xuqing Liu,Shengmin Jia,Yongyi Zhang,Yingying Yu,Chunjing Zhang,Dandan Liu
Continuous-flow photoreactors hold great promise for the highly efficient photodegradation of pollutants due to their continuity and sustainability. However, how to enable a continuous-flow photoreactor with the combined features of high photodegradation efficiency and durability as well as broad-wavelength light absorption and large-scale processing remains a significant challenge. Herein, we demonstrate a facile and effective strategy to construct a sieve-like carbon nanotube (CNT)/TiO2nanowire film (SCTF) with superior flexibility (180° bending), high tensile strength (75–82 MPa), good surface wettability, essential light penetration and convenient visible light absorption. Significantly, the unique architecture, featuring abundant, well-ordered and uniform mesopores with ca. 70 µm in diameter, as well as a homogenous distribution of TiO2nanowires with an average diameter of ca. 500 nm, could act as a “waterway” for efficient solution infiltration through the SCTF, thereby, enabling the photocatalytic degradation of polluted water in a continuous-flow mode. The optimized SCTF-2.5 displayed favorable photocatalytic behavior with 96% degradation of rhodamine B (RhB) within 80 min and a rate constant of 0.0394 min−1. The continuous-flow photodegradation device made using SCTF-2.5 featured exceptional photocatalytic behavior for the continuous degradation of RhB under simulated solar irradiation with a high degradation ratio (99.6%) and long-term stability (99.2% retention after working continuously for 72 h). This work sheds light on new strategies for designing and fabricating high-performance continuous-flow photoreactors toward future uses.Keywords:sieve-like CNT film;TiO2nanowire;continuous-flow device;photodegradation;pollutant
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Hengjun Rao,Wei Qi,Rongxin Su,Zhimin He,Xin Peng
Rhodamine B (RB), an important congeneric form of rhodamine dyes, is widely used as a colorant and tracing agent, and recent studies have shown that it is potentially harmful to wildlife and human health. To assess the toxicity of RB at the molecular level, the interaction between human serum albumin (HSA) and RB was investigated using NMR, multispectroscopic methods in combination with computational approaches. The data of NMR indicated that RB indeed bound to HSA, in which the benzene rings were spatially close to the binding site of HSA. The fluorescence results showed that RB had a moderate binding affinity to HSA and strongly quenched the intrinsic fluorescence of HSA through a static quenching mechanism. Analysis of thermodynamic parameters and the effect of ionic strength revealed that electrostatic , hydrophobic and hydrogen bond interactions played an important role in the complex formation. And the main binding region of RB was located near site I of HSA. Furthermore, the microenvironment and conformation of HSA were changed in the presence of RB, which was confirmed by the results obtained from CD, FT-IR, and synchronous fluorescence. Finally, the optimal binding mode of RB to HSA and the stability of HSA-RB complex were studied through molecular modeling methods. In short, this work would provide significant insights for understanding the transport, distribution and toxicity effect of RB when it spread in human body.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Letian Chen,Yongli Liu,Guohao Cheng,Zegang Fan,Jinyu Yuan,Shuailong He,Guifen Zhu
The widespread occurrence of sulfathiazole (STZ) in the environment has raised concerns regarding the potential risks to ecosystem and human health. Thus, there is a need to develop facile and efficient methods for monitoring STZ. In this study, a novel fluorescent probe, based on N, B, F co-doped carbon dots (N, B, F-CDs), was developed for the highly sensitive and selective determination of STZ. The fluorescent N, B, F-CDs were prepared via a one-step hydrothermal method using malonate and 1-allyl-3-vinylimidazolium tetrafluoroborate ionic liquid as precursors. The obtained N, B, F-CDs exhibited excellent fluorescence response toward STZ due to the inner filter effect (IFE), which caused the fluorescence to be quenched. The fluorescent probe allowed the STZ concentration to be accurately determined with a low detection limit of 5.5 ng mL −1 in two wide linear ranges of 0.008–10 μg mL −1 and 10–45 μg mL −1 . The practicability of the fluorescent probe was further validated in river water, soil, milk, and egg samples, and the satisfactory spiked recoveries of STZ ranged from 96.1 to 101.6%. The proposed fluorescent probe based on N, B, F-CDs can be easily prepared and possess high selectivity and sensitivity, thereby displaying its tremendous potential for the identification and determination of STZ in the environment.
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BIOMACROMOLECULES
·
2020
·
IF 6.092
Chao Chen,Ying Tian,Fenglong Li,Han Hu,Kai Wang,Zhengyang Kong,Wu Bin Ying,Ruoyu Zhang,Jin Zhu
Polylactic acid (PLA) is a biodegradable thermoplastic polyester produced from natural resources. Because of its brittleness, many tougheners have been developed. However, traditional toughening methods cause either the loss of modulus and strength or the lack of degradability. In this work, we synthesized a biobased and potentially biodegradable poly(butylene 2,5-furandicarboxylate)-b-poly(ethylene glycol) (PBFEG50) copolymer to toughen PLA, with the purpose of both keeping mechanical strength and enhancing the toughness. The blend containing 5 wt % PBFEG50 exhibited about 28.5 times increase in elongation at break (5.5% vs 156.5%). At the same time, the tensile modulus even strikingly increased by 21.6% while the tensile strength was seldom deteriorated. Such a phenomenon could be explained by the stretch-induced crystallization of the BF segment and the interconnected morphology of PBFEG50 domains in PLA5. The Raman spectrum was used to identify the phase dispersion of PLA and PBFEG50 phases. As the PBFEG50 content increased, the interconnected PBFEG50 domains start to separate, but their size increases. Interestingly, tensile-induced cavitation could be clearly identified in scanning electron microscopy images, which meant that the miscibility between PLA and PBFEG50 was limited. The crystallization of PLA/PBFEG50 blends was examined by differential scanning calorimetry, and the plasticizer effect of the EG segment on the PLA matrix could be confirmed. The rheological experiment revealed decreased viscosity of PLA/PBFEG50 blends, implying the possible greener processing. Finally, potential biodegradability of these blends was proved.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Yanhong Chao,Jingyu Pang,Yan Bai,Peiwen Wu,Jing Luo,Jing He,Yan Jin,Xiaowei Li,Jun Xiong,Huaming Li,Wenshuai Zhu
A novel dendritic silicon dioxide nanocomposite coated with a highly dispersed graphene-like boron nitride nanosheet ( g -BN(x)@SiO 2 ) was in-situ synthesized and employed as a solid-phase extraction material for the Rhodamine B (RhB) and Rhodamine 6G (R6G) enrichment in food samples prior to their quantitation by HPLC. The structures and morphologies of g -BN(x)@SiO 2 were characterized by XRD, FTIR, BET and TEM. The adsorption performance and mechanism were investigated and showed an enhanced maximum adsorption capacity of 625 mg/g for RhB on the nanocomposite loaded with 1% of g -BN via a fast, spontaneous process. Under optimal extraction conditions, this method showed low detection and quantification limits (2.8 μg/L for RhB, 2.1 μg/L for R6G and 9.2 μg/L for RhB, 6.9 μg/L for R6G, respectively), good repeatability (RSD% <3.7%), and satisfactory spiked recoveries of 94.8%–103.1% for RhB and R6G in real chili powder and beverage. Therefore, the g -BN(1%)@SiO 2 -based materials possess significant potential.
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RSC Advances
·
2020
·Vol. 10
·期 15
·8949-8957
·
IF 3.119
Huijuan Shangguan,Shan Zhang,Xin Li,Qi Zhou,Jie Shi,Qianchun Deng,Fenghong Huang
Lutein scavenges free radicals and inhibits vision damage caused by photo oxidation, while decomposing easily with light and heat. Its stability and bioavailability can be tremendously improved by lutein ester synthesis. However, green and efficient esterification preparation methods are urgently needed. In this study, which used functionalized graphitic carbon nitride nanosheets (g-C3N4-Ns) as the immobilized carrier, a novel biocatalyst was designed and prepared to accommodate Candida antarctica lipase B (CALB), considerably enhancing the performance. It was characterized by TEM, XRD, FTIR, XPS, TGA, and BET to demonstrate successful preparation and then applied to catalyze esterification between lutein and succinate anhydride in dimethyl formamide (DMF) solvent resulting in a conversion rate up to 92% at 50 °C in 60 h, 34% more than free CALB under the same conditions. We believe this is the highest esterification rate in lutein esters synthesis and it has great potential to facilitate eco-friendly and efficient preparation.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jin Feng,Rongxia Huang,Zhihao Liang,Zuchao Du,Yejing Dai,Jianbo Wu,Hua-Tay Lin
This research explored the influence of Nb 5+ doping on the electrical properties and microstructure of [0.852(Bi 0.5 Na 0.5 )-0.11(Bi 0.5 K 0.5 )-0.038Ba]Ti (1- x ) Nb x O 3 (designated as BNKT-BT). The BNKT-BT samples were fabricated and the XRD results showed that the doping of Nb 5+ ions induced a transformation from the coexistence of both rhombohedral and tetragonal phase to a single pseudo cubic phase. Also, the doping of Nb 5+ ions caused the temperature of ferroelectric state-ergodic relaxor state transition to decrease below the room temperature (RT). The SEM observations showed that the Nb 5+ doping had a minor effect on the grain size of BNKT-BT samples. In addition, the samples achieved a large electrostrain of 0.43% ( d * 33 = S max / E max = 614 pm/V) under 7 kV/mm at RT. Moreover, the aging process employed at 80 °C for two weeks in air could effectively increase the electrostrain from 0.38% to 0.41% under 6 kV/mm ( d * 33 = 683 pm/V) and reduce the strain hysteresis from 57% to 34%. These results indicated that the B site doping, combined with the aging process, could provide an effective way to enhance the electrostrain performance of lead-free piezoelectric ceramics.
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THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Shijie Zhang,Jiaoqiang Zhang,Huimin Shi,Zhenguo Gao,Kaichang Kou
The polyacrylonitrile- b -poly(hydroxyethyl acrylate) (PAN- b -PHEA) was synthesized of polyacrylonitrile-TeMe (PAN-TeMe) and 2-Hydroxyethyl acrylate (HEA) via organotellurium-mediated living radical polymerization (TERP), and the PAN-TeMe and PAN- b -PHEA were characterized by several methods. A Calvet micro-calorimeter was used to investigate the polymerization of PAN-TeMe and HEA at different temperatures (358.15 K, 363.15 K, 368.15 K, 373.15 K, 378.15 K and 383.15 K). The kinetic equations of polymerization at different temperatures were obtained, and the apparent activation energy ( E ) of polymerization is 16.43±0.17 kJ∙mol −1 and the pre-exponential factor ( A ) is 0.6845±0.0366 s −1 . Furthermore, the thermodynamic parameters including the standard molar Gibbs free energy of activation ( Δ G ≠ θ ), the standard molar enthalpy of activation ( Δ H ≠ θ ) and the standard molar entropy of activation ( Δ S ≠ θ ) are acquired.
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危险品化学品经营许可证（带存储）